{
  "language": "Solidity",
  "sources": {
    "contracts/pools/weighted/WeightedPoolFactory.sol": {
      "content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program.  If not, see <http://www.gnu.org/licenses/>.\n\npragma solidity ^0.7.0;\npragma experimental ABIEncoderV2;\n\nimport \"../../vault/interfaces/IVault.sol\";\n\nimport \"../factories/BasePoolFactory.sol\";\nimport \"../factories/FactoryWidePauseWindow.sol\";\n\nimport \"./WeightedPool.sol\";\n\ncontract WeightedPoolFactory is BasePoolFactory, FactoryWidePauseWindow {\n    constructor(IVault vault) BasePoolFactory(vault) {\n        // solhint-disable-previous-line no-empty-blocks\n    }\n\n    /**\n     * @dev Deploys a new `WeightedPool`.\n     */\n    function create(\n        string memory name,\n        string memory symbol,\n        IERC20[] memory tokens,\n        uint256[] memory weights,\n        uint256 swapFeePercentage,\n        address owner\n    ) external returns (address) {\n        (uint256 pauseWindowDuration, uint256 bufferPeriodDuration) = getPauseConfiguration();\n\n        address pool = address(\n            new WeightedPool(\n                getVault(),\n                name,\n                symbol,\n                tokens,\n                weights,\n                swapFeePercentage,\n                pauseWindowDuration,\n                bufferPeriodDuration,\n                owner\n            )\n        );\n        _register(pool);\n        return pool;\n    }\n}\n"
    },
    "contracts/vault/interfaces/IVault.sol": {
      "content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program.  If not, see <http://www.gnu.org/licenses/>.\n\npragma experimental ABIEncoderV2;\n\nimport \"../../lib/openzeppelin/IERC20.sol\";\n\nimport \"./IWETH.sol\";\nimport \"./IAsset.sol\";\nimport \"./IAuthorizer.sol\";\nimport \"./IFlashLoanRecipient.sol\";\nimport \"../ProtocolFeesCollector.sol\";\n\nimport \"../../lib/helpers/ISignaturesValidator.sol\";\nimport \"../../lib/helpers/ITemporarilyPausable.sol\";\n\npragma solidity ^0.7.0;\n\n/**\n * @dev Full external interface for the Vault core contract - no external or public methods exist in the contract that\n * don't override one of these declarations.\n */\ninterface IVault is ISignaturesValidator, ITemporarilyPausable {\n    // Generalities about the Vault:\n    //\n    // - Whenever documentation refers to 'tokens', it strictly refers to ERC20-compliant token contracts. Tokens are\n    // transferred out of the Vault by calling the `IERC20.transfer` function, and transferred in by calling\n    // `IERC20.transferFrom`. In these cases, the sender must have previously allowed the Vault to use their tokens by\n    // calling `IERC20.approve`. The only deviation from the ERC20 standard that is supported is functions not returning\n    // a boolean value: in these scenarios, a non-reverting call is assumed to be successful.\n    //\n    // - All non-view functions in the Vault are non-reentrant: calling them while another one is mid-execution (e.g.\n    // while execution control is transferred to a token contract during a swap) will result in a revert. View\n    // functions can be called in a re-reentrant way, but doing so might cause them to return inconsistent results.\n    // Contracts calling view functions in the Vault must make sure the Vault has not already been entered.\n    //\n    // - View functions revert if referring to either unregistered Pools, or unregistered tokens for registered Pools.\n\n    // Authorizer\n    //\n    // Some system actions are permissioned, like setting and collecting protocol fees. This permissioning system exists\n    // outside of the Vault in the Authorizer contract: the Vault simply calls the Authorizer to check if the caller\n    // can perform a given action.\n\n    /**\n     * @dev Returns the Vault's Authorizer.\n     */\n    function getAuthorizer() external view returns (IAuthorizer);\n\n    /**\n     * @dev Sets a new Authorizer for the Vault. The caller must be allowed by the current Authorizer to do this.\n     *\n     * Emits an `AuthorizerChanged` event.\n     */\n    function setAuthorizer(IAuthorizer newAuthorizer) external;\n\n    /**\n     * @dev Emitted when a new authorizer is set by `setAuthorizer`.\n     */\n    event AuthorizerChanged(IAuthorizer indexed newAuthorizer);\n\n    // Relayers\n    //\n    // Additionally, it is possible for an account to perform certain actions on behalf of another one, using their\n    // Vault ERC20 allowance and Internal Balance. These accounts are said to be 'relayers' for these Vault functions,\n    // and are expected to be smart contracts with sound authentication mechanisms. For an account to be able to wield\n    // this power, two things must occur:\n    //  - The Authorizer must grant the account the permission to be a relayer for the relevant Vault function. This\n    //    means that Balancer governance must approve each individual contract to act as a relayer for the intended\n    //    functions.\n    //  - Each user must approve the relayer to act on their behalf.\n    // This double protection means users cannot be tricked into approving malicious relayers (because they will not\n    // have been allowed by the Authorizer via governance), nor can malicious relayers approved by a compromised\n    // Authorizer or governance drain user funds, since they would also need to be approved by each individual user.\n\n    /**\n     * @dev Returns true if `user` has approved `relayer` to act as a relayer for them.\n     */\n    function hasApprovedRelayer(address user, address relayer) external view returns (bool);\n\n    /**\n     * @dev Allows `relayer` to act as a relayer for `sender` if `approved` is true, and disallows it otherwise.\n     *\n     * Emits a `RelayerApprovalChanged` event.\n     */\n    function setRelayerApproval(\n        address sender,\n        address relayer,\n        bool approved\n    ) external;\n\n    /**\n     * @dev Emitted every time a relayer is approved or disapproved by `setRelayerApproval`.\n     */\n    event RelayerApprovalChanged(address indexed relayer, address indexed sender, bool approved);\n\n    // Internal Balance\n    //\n    // Users can deposit tokens into the Vault, where they are allocated to their Internal Balance, and later\n    // transferred or withdrawn. It can also be used as a source of tokens when joining Pools, as a destination\n    // when exiting them, and as either when performing swaps. This usage of Internal Balance results in greatly reduced\n    // gas costs when compared to relying on plain ERC20 transfers, leading to large savings for frequent users.\n    //\n    // Internal Balance management features batching, which means a single contract call can be used to perform multiple\n    // operations of different kinds, with different senders and recipients, at once.\n\n    /**\n     * @dev Returns `user`'s Internal Balance for a set of tokens.\n     */\n    function getInternalBalance(address user, IERC20[] memory tokens) external view returns (uint256[] memory);\n\n    /**\n     * @dev Performs a set of user balance operations, which involve Internal Balance (deposit, withdraw or transfer)\n     * and plain ERC20 transfers using the Vault's allowance. This last feature is particularly useful for relayers, as\n     * it lets integrators reuse a user's Vault allowance.\n     *\n     * For each operation, if the caller is not `sender`, it must be an authorized relayer for them.\n     */\n    function manageUserBalance(UserBalanceOp[] memory ops) external payable;\n\n    /**\n     * @dev Data for `manageUserBalance` operations, which include the possibility for ETH to be sent and received\n     without manual WETH wrapping or unwrapping.\n     */\n    struct UserBalanceOp {\n        UserBalanceOpKind kind;\n        IAsset asset;\n        uint256 amount;\n        address sender;\n        address payable recipient;\n    }\n\n    // There are four possible operations in `manageUserBalance`:\n    //\n    // - DEPOSIT_INTERNAL\n    // Increases the Internal Balance of the `recipient` account by transferring tokens from the corresponding\n    // `sender`. The sender must have allowed the Vault to use their tokens via `IERC20.approve()`.\n    //\n    // ETH can be used by passing the ETH sentinel value as the asset and forwarding ETH in the call: it will be wrapped\n    // and deposited as WETH. Any ETH amount remaining will be sent back to the caller (not the sender, which is\n    // relevant for relayers).\n    //\n    // Emits an `InternalBalanceChanged` event.\n    //\n    //\n    // - WITHDRAW_INTERNAL\n    // Decreases the Internal Balance of the `sender` account by transferring tokens to the `recipient`.\n    //\n    // ETH can be used by passing the ETH sentinel value as the asset. This will deduct WETH instead, unwrap it and send\n    // it to the recipient as ETH.\n    //\n    // Emits an `InternalBalanceChanged` event.\n    //\n    //\n    // - TRANSFER_INTERNAL\n    // Transfers tokens from the Internal Balance of the `sender` account to the Internal Balance of `recipient`.\n    //\n    // Reverts if the ETH sentinel value is passed.\n    //\n    // Emits an `InternalBalanceChanged` event.\n    //\n    //\n    // - TRANSFER_EXTERNAL\n    // Transfers tokens from `sender` to `recipient`, using the Vault's ERC20 allowance. This is typically used by\n    // relayers, as it lets them reuse a user's Vault allowance.\n    //\n    // Reverts if the ETH sentinel value is passed.\n    //\n    // Emits an `ExternalBalanceTransfer` event.\n\n    enum UserBalanceOpKind { DEPOSIT_INTERNAL, WITHDRAW_INTERNAL, TRANSFER_INTERNAL, TRANSFER_EXTERNAL }\n\n    /**\n     * @dev Emitted when a user's Internal Balance changes, either from calls to `manageUserBalance`, or through\n     * interacting with Pools using Internal Balance.\n     *\n     * Because Internal Balance works exclusively with ERC20 tokens, ETH deposits and withdrawals will use the WETH\n     * address.\n     */\n    event InternalBalanceChanged(address indexed user, IERC20 indexed token, int256 delta);\n\n    /**\n     * @dev Emitted when a user's Vault ERC20 allowance is used by the Vault to transfer tokens to an external account.\n     */\n    event ExternalBalanceTransfer(IERC20 indexed token, address indexed sender, address recipient, uint256 amount);\n\n    // Pools\n    //\n    // There are three specialization settings for Pools, which allow for cheaper swaps at the cost of reduced\n    // functionality:\n    //\n    //  - General: no specialization, suited for all Pools. IGeneralPool is used for swap request callbacks, passing the\n    // balance of all tokens in the Pool. These Pools have the largest swap costs (because of the extra storage reads),\n    // which increase with the number of registered tokens.\n    //\n    //  - Minimal Swap Info: IMinimalSwapInfoPool is used instead of IGeneralPool, which saves gas by only passing the\n    // balance of the two tokens involved in the swap. This is suitable for some pricing algorithms, like the weighted\n    // constant product one popularized by Balancer V1. Swap costs are smaller compared to general Pools, and are\n    // independent of the number of registered tokens.\n    //\n    //  - Two Token: only allows two tokens to be registered. This achieves the lowest possible swap gas cost. Like\n    // minimal swap info Pools, these are called via IMinimalSwapInfoPool.\n\n    enum PoolSpecialization { GENERAL, MINIMAL_SWAP_INFO, TWO_TOKEN }\n\n    /**\n     * @dev Registers the caller account as a Pool with a given specialization setting. Returns the Pool's ID, which\n     * is used in all Pool-related functions. Pools cannot be deregistered, nor can the Pool's specialization be\n     * changed.\n     *\n     * The caller is expected to be a smart contract that implements either `IGeneralPool` or `IMinimalSwapInfoPool`,\n     * depending on the chosen specialization setting. This contract is known as the Pool's contract.\n     *\n     * Note that the same contract may register itself as multiple Pools with unique Pool IDs, or in other words,\n     * multiple Pools may share the same contract.\n     *\n     * Emits a `PoolRegistered` event.\n     */\n    function registerPool(PoolSpecialization specialization) external returns (bytes32);\n\n    /**\n     * @dev Emitted when a Pool is registered by calling `registerPool`.\n     */\n    event PoolRegistered(bytes32 indexed poolId, address indexed poolAddress, PoolSpecialization specialization);\n\n    /**\n     * @dev Returns a Pool's contract address and specialization setting.\n     */\n    function getPool(bytes32 poolId) external view returns (address, PoolSpecialization);\n\n    /**\n     * @dev Registers `tokens` for the `poolId` Pool. Must be called by the Pool's contract.\n     *\n     * Pools can only interact with tokens they have registered. Users join a Pool by transferring registered tokens,\n     * exit by receiving registered tokens, and can only swap registered tokens.\n     *\n     * Each token can only be registered once. For Pools with the Two Token specialization, `tokens` must have a length\n     * of two, that is, both tokens must be registered in the same `registerTokens` call, and they must be sorted in\n     * ascending order.\n     *\n     * The `tokens` and `assetManagers` arrays must have the same length, and each entry in these indicates the Asset\n     * Manager for the corresponding token. Asset Managers can manage a Pool's tokens via `managePoolBalance`,\n     * depositing and withdrawing them directly, and can even set their balance to arbitrary amounts. They are therefore\n     * expected to be highly secured smart contracts with sound design principles, and the decision to register an\n     * Asset Manager should not be made lightly.\n     *\n     * Pools can choose not to assign an Asset Manager to a given token by passing in the zero address. Once an Asset\n     * Manager is set, it cannot be changed except by deregistering the associated token and registering again with a\n     * different Asset Manager.\n     *\n     * Emits a `TokensRegistered` event.\n     */\n    function registerTokens(\n        bytes32 poolId,\n        IERC20[] memory tokens,\n        address[] memory assetManagers\n    ) external;\n\n    /**\n     * @dev Emitted when a Pool registers tokens by calling `registerTokens`.\n     */\n    event TokensRegistered(bytes32 indexed poolId, IERC20[] tokens, address[] assetManagers);\n\n    /**\n     * @dev Deregisters `tokens` for the `poolId` Pool. Must be called by the Pool's contract.\n     *\n     * Only registered tokens (via `registerTokens`) can be deregistered. Additionally, they must have zero total\n     * balance. For Pools with the Two Token specialization, `tokens` must have a length of two, that is, both tokens\n     * must be deregistered in the same `deregisterTokens` call.\n     *\n     * A deregistered token can be re-registered later on, possibly with a different Asset Manager.\n     *\n     * Emits a `TokensDeregistered` event.\n     */\n    function deregisterTokens(bytes32 poolId, IERC20[] memory tokens) external;\n\n    /**\n     * @dev Emitted when a Pool deregisters tokens by calling `deregisterTokens`.\n     */\n    event TokensDeregistered(bytes32 indexed poolId, IERC20[] tokens);\n\n    /**\n     * @dev Returns detailed information for a Pool's registered token.\n     *\n     * `cash` is the number of tokens the Vault currently holds for the Pool. `managed` is the number of tokens\n     * withdrawn and held outside the Vault by the Pool's token Asset Manager. The Pool's total balance for `token`\n     * equals the sum of `cash` and `managed`.\n     *\n     * Internally, `cash` and `managed` are stored using 112 bits. No action can ever cause a Pool's token `cash`,\n     * `managed` or `total` balance to be greater than 2^112 - 1.\n     *\n     * `lastChangeBlock` is the number of the block in which `token`'s total balance was last modified (via either a\n     * join, exit, swap, or Asset Manager update). This value is useful to avoid so-called 'sandwich attacks', for\n     * example when developing price oracles. A change of zero (e.g. caused by a swap with amount zero) is considered a\n     * change for this purpose, and will update `lastChangeBlock`.\n     *\n     * `assetManager` is the Pool's token Asset Manager.\n     */\n    function getPoolTokenInfo(bytes32 poolId, IERC20 token)\n        external\n        view\n        returns (\n            uint256 cash,\n            uint256 managed,\n            uint256 lastChangeBlock,\n            address assetManager\n        );\n\n    /**\n     * @dev Returns a Pool's registered tokens, the total balance for each, and the latest block when *any* of\n     * the tokens' `balances` changed.\n     *\n     * The order of the `tokens` array is the same order that will be used in `joinPool`, `exitPool`, as well as in all\n     * Pool hooks (where applicable). Calls to `registerTokens` and `deregisterTokens` may change this order.\n     *\n     * If a Pool only registers tokens once, and these are sorted in ascending order, they will be stored in the same\n     * order as passed to `registerTokens`.\n     *\n     * Total balances include both tokens held by the Vault and those withdrawn by the Pool's Asset Managers. These are\n     * the amounts used by joins, exits and swaps. For a detailed breakdown of token balances, use `getPoolTokenInfo`\n     * instead.\n     */\n    function getPoolTokens(bytes32 poolId)\n        external\n        view\n        returns (\n            IERC20[] memory tokens,\n            uint256[] memory balances,\n            uint256 lastChangeBlock\n        );\n\n    /**\n     * @dev Called by users to join a Pool, which transfers tokens from `sender` into the Pool's balance. This will\n     * trigger custom Pool behavior, which will typically grant something in return to `recipient` - often tokenized\n     * Pool shares.\n     *\n     * If the caller is not `sender`, it must be an authorized relayer for them.\n     *\n     * The `assets` and `maxAmountsIn` arrays must have the same length, and each entry indicates the maximum amount\n     * to send for each asset. The amounts to send are decided by the Pool and not the Vault: it just enforces\n     * these maximums.\n     *\n     * If joining a Pool that holds WETH, it is possible to send ETH directly: the Vault will do the wrapping. To enable\n     * this mechanism, the IAsset sentinel value (the zero address) must be passed in the `assets` array instead of the\n     * WETH address. Note that it is not possible to combine ETH and WETH in the same join. Any excess ETH will be sent\n     * back to the caller (not the sender, which is important for relayers).\n     *\n     * `assets` must have the same length and order as the array returned by `getPoolTokens`. This prevents issues when\n     * interacting with Pools that register and deregister tokens frequently. If sending ETH however, the array must be\n     * sorted *before* replacing the WETH address with the ETH sentinel value (the zero address), which means the final\n     * `assets` array might not be sorted. Pools with no registered tokens cannot be joined.\n     *\n     * If `fromInternalBalance` is true, the caller's Internal Balance will be preferred: ERC20 transfers will only\n     * be made for the difference between the requested amount and Internal Balance (if any). Note that ETH cannot be\n     * withdrawn from Internal Balance: attempting to do so will trigger a revert.\n     *\n     * This causes the Vault to call the `IBasePool.onJoinPool` hook on the Pool's contract, where Pools implement\n     * their own custom logic. This typically requires additional information from the user (such as the expected number\n     * of Pool shares). This can be encoded in the `userData` argument, which is ignored by the Vault and passed\n     * directly to the Pool's contract, as is `recipient`.\n     *\n     * Emits a `PoolBalanceChanged` event.\n     */\n    function joinPool(\n        bytes32 poolId,\n        address sender,\n        address recipient,\n        JoinPoolRequest memory request\n    ) external payable;\n\n    struct JoinPoolRequest {\n        IAsset[] assets;\n        uint256[] maxAmountsIn;\n        bytes userData;\n        bool fromInternalBalance;\n    }\n\n    /**\n     * @dev Called by users to exit a Pool, which transfers tokens from the Pool's balance to `recipient`. This will\n     * trigger custom Pool behavior, which will typically ask for something in return from `sender` - often tokenized\n     * Pool shares. The amount of tokens that can be withdrawn is limited by the Pool's `cash` balance (see\n     * `getPoolTokenInfo`).\n     *\n     * If the caller is not `sender`, it must be an authorized relayer for them.\n     *\n     * The `tokens` and `minAmountsOut` arrays must have the same length, and each entry in these indicates the minimum\n     * token amount to receive for each token contract. The amounts to send are decided by the Pool and not the Vault:\n     * it just enforces these minimums.\n     *\n     * If exiting a Pool that holds WETH, it is possible to receive ETH directly: the Vault will do the unwrapping. To\n     * enable this mechanism, the IAsset sentinel value (the zero address) must be passed in the `assets` array instead\n     * of the WETH address. Note that it is not possible to combine ETH and WETH in the same exit.\n     *\n     * `assets` must have the same length and order as the array returned by `getPoolTokens`. This prevents issues when\n     * interacting with Pools that register and deregister tokens frequently. If receiving ETH however, the array must\n     * be sorted *before* replacing the WETH address with the ETH sentinel value (the zero address), which means the\n     * final `assets` array might not be sorted. Pools with no registered tokens cannot be exited.\n     *\n     * If `toInternalBalance` is true, the tokens will be deposited to `recipient`'s Internal Balance. Otherwise,\n     * an ERC20 transfer will be performed. Note that ETH cannot be deposited to Internal Balance: attempting to\n     * do so will trigger a revert.\n     *\n     * `minAmountsOut` is the minimum amount of tokens the user expects to get out of the Pool, for each token in the\n     * `tokens` array. This array must match the Pool's registered tokens.\n     *\n     * This causes the Vault to call the `IBasePool.onExitPool` hook on the Pool's contract, where Pools implement\n     * their own custom logic. This typically requires additional information from the user (such as the expected number\n     * of Pool shares to return). This can be encoded in the `userData` argument, which is ignored by the Vault and\n     * passed directly to the Pool's contract.\n     *\n     * Emits a `PoolBalanceChanged` event.\n     */\n    function exitPool(\n        bytes32 poolId,\n        address sender,\n        address payable recipient,\n        ExitPoolRequest memory request\n    ) external;\n\n    struct ExitPoolRequest {\n        IAsset[] assets;\n        uint256[] minAmountsOut;\n        bytes userData;\n        bool toInternalBalance;\n    }\n\n    /**\n     * @dev Emitted when a user joins or exits a Pool by calling `joinPool` or `exitPool`, respectively.\n     */\n    event PoolBalanceChanged(\n        bytes32 indexed poolId,\n        address indexed liquidityProvider,\n        IERC20[] tokens,\n        int256[] deltas,\n        uint256[] protocolFeeAmounts\n    );\n\n    enum PoolBalanceChangeKind { JOIN, EXIT }\n\n    // Swaps\n    //\n    // Users can swap tokens with Pools by calling the `swap` and `batchSwap` functions. To do this,\n    // they need not trust Pool contracts in any way: all security checks are made by the Vault. They must however be\n    // aware of the Pools' pricing algorithms in order to estimate the prices Pools will quote.\n    //\n    // The `swap` function executes a single swap, while `batchSwap` can perform multiple swaps in sequence.\n    // In each individual swap, tokens of one kind are sent from the sender to the Pool (this is the 'token in'),\n    // and tokens of another kind are sent from the Pool to the recipient in exchange (this is the 'token out').\n    // More complex swaps, such as one token in to multiple tokens out can be achieved by batching together\n    // individual swaps.\n    //\n    // There are two swap kinds:\n    //  - 'given in' swaps, where the amount of tokens in (sent to the Pool) is known, and the Pool determines (via the\n    // `onSwap` hook) the amount of tokens out (to send to the recipient).\n    //  - 'given out' swaps, where the amount of tokens out (received from the Pool) is known, and the Pool determines\n    // (via the `onSwap` hook) the amount of tokens in (to receive from the sender).\n    //\n    // Additionally, it is possible to chain swaps using a placeholder input amount, which the Vault replaces with\n    // the calculated output of the previous swap. If the previous swap was 'given in', this will be the calculated\n    // tokenOut amount. If the previous swap was 'given out', it will use the calculated tokenIn amount. These extended\n    // swaps are known as 'multihop' swaps, since they 'hop' through a number of intermediate tokens before arriving at\n    // the final intended token.\n    //\n    // In all cases, tokens are only transferred in and out of the Vault (or withdrawn from and deposited into Internal\n    // Balance) after all individual swaps have been completed, and the net token balance change computed. This makes\n    // certain swap patterns, such as multihops, or swaps that interact with the same token pair in multiple Pools, cost\n    // much less gas than they would otherwise.\n    //\n    // It also means that under certain conditions it is possible to perform arbitrage by swapping with multiple\n    // Pools in a way that results in net token movement out of the Vault (profit), with no tokens being sent in (only\n    // updating the Pool's internal accounting).\n    //\n    // To protect users from front-running or the market changing rapidly, they supply a list of 'limits' for each token\n    // involved in the swap, where either the maximum number of tokens to send (by passing a positive value) or the\n    // minimum amount of tokens to receive (by passing a negative value) is specified.\n    //\n    // Additionally, a 'deadline' timestamp can also be provided, forcing the swap to fail if it occurs after\n    // this point in time (e.g. if the transaction failed to be included in a block promptly).\n    //\n    // If interacting with Pools that hold WETH, it is possible to both send and receive ETH directly: the Vault will do\n    // the wrapping and unwrapping. To enable this mechanism, the IAsset sentinel value (the zero address) must be\n    // passed in the `assets` array instead of the WETH address. Note that it is possible to combine ETH and WETH in the\n    // same swap. Any excess ETH will be sent back to the caller (not the sender, which is relevant for relayers).\n    //\n    // Finally, Internal Balance can be used when either sending or receiving tokens.\n\n    enum SwapKind { GIVEN_IN, GIVEN_OUT }\n\n    /**\n     * @dev Performs a swap with a single Pool.\n     *\n     * If the swap is 'given in' (the number of tokens to send to the Pool is known), it returns the amount of tokens\n     * taken from the Pool, which must be greater than or equal to `limit`.\n     *\n     * If the swap is 'given out' (the number of tokens to take from the Pool is known), it returns the amount of tokens\n     * sent to the Pool, which must be less than or equal to `limit`.\n     *\n     * Internal Balance usage and the recipient are determined by the `funds` struct.\n     *\n     * Emits a `Swap` event.\n     */\n    function swap(\n        SingleSwap memory singleSwap,\n        FundManagement memory funds,\n        uint256 limit,\n        uint256 deadline\n    ) external payable returns (uint256);\n\n    /**\n     * @dev Data for a single swap executed by `swap`. `amount` is either `amountIn` or `amountOut` depending on\n     * the `kind` value.\n     *\n     * `assetIn` and `assetOut` are either token addresses, or the IAsset sentinel value for ETH (the zero address).\n     * Note that Pools never interact with ETH directly: it will be wrapped to or unwrapped from WETH by the Vault.\n     *\n     * The `userData` field is ignored by the Vault, but forwarded to the Pool in the `onSwap` hook, and may be\n     * used to extend swap behavior.\n     */\n    struct SingleSwap {\n        bytes32 poolId;\n        SwapKind kind;\n        IAsset assetIn;\n        IAsset assetOut;\n        uint256 amount;\n        bytes userData;\n    }\n\n    /**\n     * @dev Performs a series of swaps with one or multiple Pools. In each individual swap, the caller determines either\n     * the amount of tokens sent to or received from the Pool, depending on the `kind` value.\n     *\n     * Returns an array with the net Vault asset balance deltas. Positive amounts represent tokens (or ETH) sent to the\n     * Vault, and negative amounts represent tokens (or ETH) sent by the Vault. Each delta corresponds to the asset at\n     * the same index in the `assets` array.\n     *\n     * Swaps are executed sequentially, in the order specified by the `swaps` array. Each array element describes a\n     * Pool, the token to be sent to this Pool, the token to receive from it, and an amount that is either `amountIn` or\n     * `amountOut` depending on the swap kind.\n     *\n     * Multihop swaps can be executed by passing an `amount` value of zero for a swap. This will cause the amount in/out\n     * of the previous swap to be used as the amount in for the current one. In a 'given in' swap, 'tokenIn' must equal\n     * the previous swap's `tokenOut`. For a 'given out' swap, `tokenOut` must equal the previous swap's `tokenIn`.\n     *\n     * The `assets` array contains the addresses of all assets involved in the swaps. These are either token addresses,\n     * or the IAsset sentinel value for ETH (the zero address). Each entry in the `swaps` array specifies tokens in and\n     * out by referencing an index in `assets`. Note that Pools never interact with ETH directly: it will be wrapped to\n     * or unwrapped from WETH by the Vault.\n     *\n     * Internal Balance usage, sender, and recipient are determined by the `funds` struct. The `limits` array specifies\n     * the minimum or maximum amount of each token the vault is allowed to transfer.\n     *\n     * `batchSwap` can be used to make a single swap, like `swap` does, but doing so requires more gas than the\n     * equivalent `swap` call.\n     *\n     * Emits `Swap` events.\n     */\n    function batchSwap(\n        SwapKind kind,\n        BatchSwapStep[] memory swaps,\n        IAsset[] memory assets,\n        FundManagement memory funds,\n        int256[] memory limits,\n        uint256 deadline\n    ) external payable returns (int256[] memory);\n\n    /**\n     * @dev Data for each individual swap executed by `batchSwap`. The asset in and out fields are indexes into the\n     * `assets` array passed to that function, and ETH assets are converted to WETH.\n     *\n     * If `amount` is zero, the multihop mechanism is used to determine the actual amount based on the amount in/out\n     * from the previous swap, depending on the swap kind.\n     *\n     * The `userData` field is ignored by the Vault, but forwarded to the Pool in the `onSwap` hook, and may be\n     * used to extend swap behavior.\n     */\n    struct BatchSwapStep {\n        bytes32 poolId;\n        uint256 assetInIndex;\n        uint256 assetOutIndex;\n        uint256 amount;\n        bytes userData;\n    }\n\n    /**\n     * @dev Emitted for each individual swap performed by `swap` or `batchSwap`.\n     */\n    event Swap(\n        bytes32 indexed poolId,\n        IERC20 indexed tokenIn,\n        IERC20 indexed tokenOut,\n        uint256 amountIn,\n        uint256 amountOut\n    );\n\n    /**\n     * @dev All tokens in a swap are either sent from the `sender` account to the Vault, or from the Vault to the\n     * `recipient` account.\n     *\n     * If the caller is not `sender`, it must be an authorized relayer for them.\n     *\n     * If `fromInternalBalance` is true, the `sender`'s Internal Balance will be preferred, performing an ERC20\n     * transfer for the difference between the requested amount and the User's Internal Balance (if any). The `sender`\n     * must have allowed the Vault to use their tokens via `IERC20.approve()`. This matches the behavior of\n     * `joinPool`.\n     *\n     * If `toInternalBalance` is true, tokens will be deposited to `recipient`'s internal balance instead of\n     * transferred. This matches the behavior of `exitPool`.\n     *\n     * Note that ETH cannot be deposited to or withdrawn from Internal Balance: attempting to do so will trigger a\n     * revert.\n     */\n    struct FundManagement {\n        address sender;\n        bool fromInternalBalance;\n        address payable recipient;\n        bool toInternalBalance;\n    }\n\n    /**\n     * @dev Simulates a call to `batchSwap`, returning an array of Vault asset deltas. Calls to `swap` cannot be\n     * simulated directly, but an equivalent `batchSwap` call can and will yield the exact same result.\n     *\n     * Each element in the array corresponds to the asset at the same index, and indicates the number of tokens (or ETH)\n     * the Vault would take from the sender (if positive) or send to the recipient (if negative). The arguments it\n     * receives are the same that an equivalent `batchSwap` call would receive.\n     *\n     * Unlike `batchSwap`, this function performs no checks on the sender or recipient field in the `funds` struct.\n     * This makes it suitable to be called by off-chain applications via eth_call without needing to hold tokens,\n     * approve them for the Vault, or even know a user's address.\n     *\n     * Note that this function is not 'view' (due to implementation details): the client code must explicitly execute\n     * eth_call instead of eth_sendTransaction.\n     */\n    function queryBatchSwap(\n        SwapKind kind,\n        BatchSwapStep[] memory swaps,\n        IAsset[] memory assets,\n        FundManagement memory funds\n    ) external returns (int256[] memory assetDeltas);\n\n    // Flash Loans\n\n    /**\n     * @dev Performs a 'flash loan', sending tokens to `recipient`, executing the `receiveFlashLoan` hook on it,\n     * and then reverting unless the tokens plus a proportional protocol fee have been returned.\n     *\n     * The `tokens` and `amounts` arrays must have the same length, and each entry in these indicates the loan amount\n     * for each token contract. `tokens` must be sorted in ascending order.\n     *\n     * The 'userData' field is ignored by the Vault, and forwarded as-is to `recipient` as part of the\n     * `receiveFlashLoan` call.\n     *\n     * Emits `FlashLoan` events.\n     */\n    function flashLoan(\n        IFlashLoanRecipient recipient,\n        IERC20[] memory tokens,\n        uint256[] memory amounts,\n        bytes memory userData\n    ) external;\n\n    /**\n     * @dev Emitted for each individual flash loan performed by `flashLoan`.\n     */\n    event FlashLoan(IFlashLoanRecipient indexed recipient, IERC20 indexed token, uint256 amount, uint256 feeAmount);\n\n    // Asset Management\n    //\n    // Each token registered for a Pool can be assigned an Asset Manager, which is able to freely withdraw the Pool's\n    // tokens from the Vault, deposit them, or assign arbitrary values to its `managed` balance (see\n    // `getPoolTokenInfo`). This makes them extremely powerful and dangerous. Even if an Asset Manager only directly\n    // controls one of the tokens in a Pool, a malicious manager could set that token's balance to manipulate the\n    // prices of the other tokens, and then drain the Pool with swaps. The risk of using Asset Managers is therefore\n    // not constrained to the tokens they are managing, but extends to the entire Pool's holdings.\n    //\n    // However, a properly designed Asset Manager smart contract can be safely used for the Pool's benefit,\n    // for example by lending unused tokens out for interest, or using them to participate in voting protocols.\n    //\n    // This concept is unrelated to the IAsset interface.\n\n    /**\n     * @dev Performs a set of Pool balance operations, which may be either withdrawals, deposits or updates.\n     *\n     * Pool Balance management features batching, which means a single contract call can be used to perform multiple\n     * operations of different kinds, with different Pools and tokens, at once.\n     *\n     * For each operation, the caller must be registered as the Asset Manager for `token` in `poolId`.\n     */\n    function managePoolBalance(PoolBalanceOp[] memory ops) external;\n\n    struct PoolBalanceOp {\n        PoolBalanceOpKind kind;\n        bytes32 poolId;\n        IERC20 token;\n        uint256 amount;\n    }\n\n    /**\n     * Withdrawals decrease the Pool's cash, but increase its managed balance, leaving the total balance unchanged.\n     *\n     * Deposits increase the Pool's cash, but decrease its managed balance, leaving the total balance unchanged.\n     *\n     * Updates don't affect the Pool's cash balance, but because the managed balance changes, it does alter the total.\n     * The external amount can be either increased or decreased by this call (i.e., reporting a gain or a loss).\n     */\n    enum PoolBalanceOpKind { WITHDRAW, DEPOSIT, UPDATE }\n\n    /**\n     * @dev Emitted when a Pool's token Asset Manager alters its balance via `managePoolBalance`.\n     */\n    event PoolBalanceManaged(\n        bytes32 indexed poolId,\n        address indexed assetManager,\n        IERC20 indexed token,\n        int256 cashDelta,\n        int256 managedDelta\n    );\n\n    // Protocol Fees\n    //\n    // Some operations cause the Vault to collect tokens in the form of protocol fees, which can then be withdrawn by\n    // permissioned accounts.\n    //\n    // There are two kinds of protocol fees:\n    //\n    //  - flash loan fees: charged on all flash loans, as a percentage of the amounts lent.\n    //\n    //  - swap fees: a percentage of the fees charged by Pools when performing swaps. For a number of reasons, including\n    // swap gas costs and interface simplicity, protocol swap fees are not charged on each individual swap. Rather,\n    // Pools are expected to keep track of how much they have charged in swap fees, and pay any outstanding debts to the\n    // Vault when they are joined or exited. This prevents users from joining a Pool with unpaid debt, as well as\n    // exiting a Pool in debt without first paying their share.\n\n    /**\n     * @dev Returns the current protocol fee module.\n     */\n    function getProtocolFeesCollector() external view returns (ProtocolFeesCollector);\n\n    /**\n     * @dev Safety mechanism to pause most Vault operations in the event of an emergency - typically detection of an\n     * error in some part of the system.\n     *\n     * The Vault can only be paused during an initial time period, after which pausing is forever disabled.\n     *\n     * While the contract is paused, the following features are disabled:\n     * - depositing and transferring internal balance\n     * - transferring external balance (using the Vault's allowance)\n     * - swaps\n     * - joining Pools\n     * - Asset Manager interactions\n     *\n     * Internal Balance can still be withdrawn, and Pools exited.\n     */\n    function setPaused(bool paused) external;\n\n    /**\n     * @dev Returns the Vault's WETH instance.\n     */\n    function WETH() external view returns (IWETH);\n    // solhint-disable-previous-line func-name-mixedcase\n}\n"
    },
    "contracts/pools/factories/BasePoolFactory.sol": {
      "content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program.  If not, see <http://www.gnu.org/licenses/>.\n\npragma solidity ^0.7.0;\npragma experimental ABIEncoderV2;\n\nimport \"../../vault/interfaces/IVault.sol\";\nimport \"../../vault/interfaces/IBasePool.sol\";\n\n/**\n * @dev Base contract for Pool factories.\n *\n * Pools are deployed from factories to allow third parties to reason about them. Unknown Pools may have arbitrary\n * logic: being able to assert that a Pool's behavior follows certain rules (those imposed by the contracts created by\n * the factory) is very powerful.\n */\nabstract contract BasePoolFactory {\n    IVault private immutable _vault;\n    mapping(address => bool) private _isPoolFromFactory;\n\n    event PoolCreated(address indexed pool);\n\n    constructor(IVault vault) {\n        _vault = vault;\n    }\n\n    /**\n     * @dev Returns the Vault's address.\n     */\n    function getVault() public view returns (IVault) {\n        return _vault;\n    }\n\n    /**\n     * @dev Returns true if `pool` was created by this factory.\n     */\n    function isPoolFromFactory(address pool) external view returns (bool) {\n        return _isPoolFromFactory[pool];\n    }\n\n    /**\n     * @dev Registers a new created pool.\n     *\n     * Emits a `PoolCreated` event.\n     */\n    function _register(address pool) internal {\n        _isPoolFromFactory[pool] = true;\n        emit PoolCreated(pool);\n    }\n}\n"
    },
    "contracts/pools/factories/FactoryWidePauseWindow.sol": {
      "content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program.  If not, see <http://www.gnu.org/licenses/>.\n\npragma solidity ^0.7.0;\npragma experimental ABIEncoderV2;\n\n/**\n * @dev Utility to create Pool factories for Pools that use the `TemporarilyPausable` contract.\n *\n * By calling `TemporarilyPausable`'s constructor with the result of `getPauseConfiguration`, all Pools created by this\n * factory will share the same Pause Window end time, after which both old and new Pools will not be pausable.\n */\ncontract FactoryWidePauseWindow {\n    // This contract relies on timestamps in a similar way as `TemporarilyPausable` does - the same caveats apply.\n    // solhint-disable not-rely-on-time\n\n    uint256 private constant _INITIAL_PAUSE_WINDOW_DURATION = 90 days;\n    uint256 private constant _BUFFER_PERIOD_DURATION = 30 days;\n\n    // Time when the pause window for all created Pools expires, and the pause window duration of new Pools becomes\n    // zero.\n    uint256 private immutable _poolsPauseWindowEndTime;\n\n    constructor() {\n        _poolsPauseWindowEndTime = block.timestamp + _INITIAL_PAUSE_WINDOW_DURATION;\n    }\n\n    /**\n     * @dev Returns the current `TemporarilyPausable` configuration that will be applied to Pools created by this\n     * factory.\n     *\n     * `pauseWindowDuration` will decrease over time until it reaches zero, at which point both it and\n     * `bufferPeriodDuration` will be zero forever, meaning deployed Pools will not be pausable.\n     */\n    function getPauseConfiguration() public view returns (uint256 pauseWindowDuration, uint256 bufferPeriodDuration) {\n        uint256 currentTime = block.timestamp;\n        if (currentTime < _poolsPauseWindowEndTime) {\n            // The buffer period is always the same since its duration is related to how much time is needed to respond\n            // to a potential emergency. The Pause Window duration however decreases as the end time approaches.\n\n            pauseWindowDuration = _poolsPauseWindowEndTime - currentTime; // No need for checked arithmetic.\n            bufferPeriodDuration = _BUFFER_PERIOD_DURATION;\n        } else {\n            // After the end time, newly created Pools have no Pause Window, nor Buffer Period (since they are not\n            // pausable in the first place).\n\n            pauseWindowDuration = 0;\n            bufferPeriodDuration = 0;\n        }\n    }\n}\n"
    },
    "contracts/pools/weighted/WeightedPool.sol": {
      "content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program.  If not, see <http://www.gnu.org/licenses/>.\n\npragma solidity ^0.7.0;\npragma experimental ABIEncoderV2;\n\nimport \"../../lib/math/FixedPoint.sol\";\nimport \"../../lib/helpers/InputHelpers.sol\";\n\nimport \"../BaseMinimalSwapInfoPool.sol\";\n\nimport \"./WeightedMath.sol\";\nimport \"./WeightedPoolUserDataHelpers.sol\";\n\n// This contract relies on tons of immutable state variables to perform efficient lookup, without resorting to storage\n// reads. Because immutable arrays are not supported, we instead declare a fixed set of state variables plus total\n// count, resulting in a large number of state variables.\n\ncontract WeightedPool is BaseMinimalSwapInfoPool, WeightedMath {\n    using FixedPoint for uint256;\n    using WeightedPoolUserDataHelpers for bytes;\n\n    // The protocol fees will always be charged using the token associated with the max weight in the pool.\n    // Since these Pools will register tokens only once, we can assume this index will be constant.\n    uint256 private immutable _maxWeightTokenIndex;\n\n    uint256 private immutable _normalizedWeight0;\n    uint256 private immutable _normalizedWeight1;\n    uint256 private immutable _normalizedWeight2;\n    uint256 private immutable _normalizedWeight3;\n    uint256 private immutable _normalizedWeight4;\n    uint256 private immutable _normalizedWeight5;\n    uint256 private immutable _normalizedWeight6;\n    uint256 private immutable _normalizedWeight7;\n\n    uint256 private _lastInvariant;\n\n    enum JoinKind { INIT, EXACT_TOKENS_IN_FOR_BPT_OUT, TOKEN_IN_FOR_EXACT_BPT_OUT }\n    enum ExitKind { EXACT_BPT_IN_FOR_ONE_TOKEN_OUT, EXACT_BPT_IN_FOR_TOKENS_OUT, BPT_IN_FOR_EXACT_TOKENS_OUT }\n\n    constructor(\n        IVault vault,\n        string memory name,\n        string memory symbol,\n        IERC20[] memory tokens,\n        uint256[] memory normalizedWeights,\n        uint256 swapFeePercentage,\n        uint256 pauseWindowDuration,\n        uint256 bufferPeriodDuration,\n        address owner\n    )\n        BaseMinimalSwapInfoPool(\n            vault,\n            name,\n            symbol,\n            tokens,\n            swapFeePercentage,\n            pauseWindowDuration,\n            bufferPeriodDuration,\n            owner\n        )\n    {\n        uint256 numTokens = tokens.length;\n        InputHelpers.ensureInputLengthMatch(numTokens, normalizedWeights.length);\n\n        // Ensure  each normalized weight is above them minimum and find the token index of the maximum weight\n        uint256 normalizedSum = 0;\n        uint256 maxWeightTokenIndex = 0;\n        uint256 maxNormalizedWeight = 0;\n        for (uint8 i = 0; i < numTokens; i++) {\n            uint256 normalizedWeight = normalizedWeights[i];\n            _require(normalizedWeight >= _MIN_WEIGHT, Errors.MIN_WEIGHT);\n\n            normalizedSum = normalizedSum.add(normalizedWeight);\n            if (normalizedWeight > maxNormalizedWeight) {\n                maxWeightTokenIndex = i;\n                maxNormalizedWeight = normalizedWeight;\n            }\n        }\n        // Ensure that the normalized weights sum to ONE\n        _require(normalizedSum == FixedPoint.ONE, Errors.NORMALIZED_WEIGHT_INVARIANT);\n\n        _maxWeightTokenIndex = maxWeightTokenIndex;\n        _normalizedWeight0 = normalizedWeights.length > 0 ? normalizedWeights[0] : 0;\n        _normalizedWeight1 = normalizedWeights.length > 1 ? normalizedWeights[1] : 0;\n        _normalizedWeight2 = normalizedWeights.length > 2 ? normalizedWeights[2] : 0;\n        _normalizedWeight3 = normalizedWeights.length > 3 ? normalizedWeights[3] : 0;\n        _normalizedWeight4 = normalizedWeights.length > 4 ? normalizedWeights[4] : 0;\n        _normalizedWeight5 = normalizedWeights.length > 5 ? normalizedWeights[5] : 0;\n        _normalizedWeight6 = normalizedWeights.length > 6 ? normalizedWeights[6] : 0;\n        _normalizedWeight7 = normalizedWeights.length > 7 ? normalizedWeights[7] : 0;\n    }\n\n    function _normalizedWeight(IERC20 token) internal view virtual returns (uint256) {\n        // prettier-ignore\n        if (token == _token0) { return _normalizedWeight0; }\n        else if (token == _token1) { return _normalizedWeight1; }\n        else if (token == _token2) { return _normalizedWeight2; }\n        else if (token == _token3) { return _normalizedWeight3; }\n        else if (token == _token4) { return _normalizedWeight4; }\n        else if (token == _token5) { return _normalizedWeight5; }\n        else if (token == _token6) { return _normalizedWeight6; }\n        else if (token == _token7) { return _normalizedWeight7; }\n        else {\n            _revert(Errors.INVALID_TOKEN);\n        }\n    }\n\n    function _normalizedWeights() internal view virtual returns (uint256[] memory) {\n        uint256 totalTokens = _getTotalTokens();\n        uint256[] memory normalizedWeights = new uint256[](totalTokens);\n\n        // prettier-ignore\n        {\n            if (totalTokens > 0) { normalizedWeights[0] = _normalizedWeight0; } else { return normalizedWeights; }\n            if (totalTokens > 1) { normalizedWeights[1] = _normalizedWeight1; } else { return normalizedWeights; }\n            if (totalTokens > 2) { normalizedWeights[2] = _normalizedWeight2; } else { return normalizedWeights; }\n            if (totalTokens > 3) { normalizedWeights[3] = _normalizedWeight3; } else { return normalizedWeights; }\n            if (totalTokens > 4) { normalizedWeights[4] = _normalizedWeight4; } else { return normalizedWeights; }\n            if (totalTokens > 5) { normalizedWeights[5] = _normalizedWeight5; } else { return normalizedWeights; }\n            if (totalTokens > 6) { normalizedWeights[6] = _normalizedWeight6; } else { return normalizedWeights; }\n            if (totalTokens > 7) { normalizedWeights[7] = _normalizedWeight7; } else { return normalizedWeights; }\n        }\n\n        return normalizedWeights;\n    }\n\n    function getLastInvariant() external view returns (uint256) {\n        return _lastInvariant;\n    }\n\n    /**\n     * @dev Returns the current value of the invariant.\n     */\n    function getInvariant() public view returns (uint256) {\n        (, uint256[] memory balances, ) = getVault().getPoolTokens(getPoolId());\n\n        // Since the Pool hooks always work with upscaled balances, we manually\n        // upscale here for consistency\n        _upscaleArray(balances, _scalingFactors());\n\n        uint256[] memory normalizedWeights = _normalizedWeights();\n        return WeightedMath._calculateInvariant(normalizedWeights, balances);\n    }\n\n    function getNormalizedWeights() external view returns (uint256[] memory) {\n        return _normalizedWeights();\n    }\n\n    // Base Pool handlers\n\n    // Swap\n\n    function _onSwapGivenIn(\n        SwapRequest memory swapRequest,\n        uint256 currentBalanceTokenIn,\n        uint256 currentBalanceTokenOut\n    ) internal view virtual override whenNotPaused returns (uint256) {\n        // Swaps are disabled while the contract is paused.\n\n        return\n            WeightedMath._calcOutGivenIn(\n                currentBalanceTokenIn,\n                _normalizedWeight(swapRequest.tokenIn),\n                currentBalanceTokenOut,\n                _normalizedWeight(swapRequest.tokenOut),\n                swapRequest.amount\n            );\n    }\n\n    function _onSwapGivenOut(\n        SwapRequest memory swapRequest,\n        uint256 currentBalanceTokenIn,\n        uint256 currentBalanceTokenOut\n    ) internal view virtual override whenNotPaused returns (uint256) {\n        // Swaps are disabled while the contract is paused.\n\n        return\n            WeightedMath._calcInGivenOut(\n                currentBalanceTokenIn,\n                _normalizedWeight(swapRequest.tokenIn),\n                currentBalanceTokenOut,\n                _normalizedWeight(swapRequest.tokenOut),\n                swapRequest.amount\n            );\n    }\n\n    // Initialize\n\n    function _onInitializePool(\n        bytes32,\n        address,\n        address,\n        bytes memory userData\n    ) internal virtual override whenNotPaused returns (uint256, uint256[] memory) {\n        // It would be strange for the Pool to be paused before it is initialized, but for consistency we prevent\n        // initialization in this case.\n\n        WeightedPool.JoinKind kind = userData.joinKind();\n        _require(kind == WeightedPool.JoinKind.INIT, Errors.UNINITIALIZED);\n\n        uint256[] memory amountsIn = userData.initialAmountsIn();\n        InputHelpers.ensureInputLengthMatch(_getTotalTokens(), amountsIn.length);\n        _upscaleArray(amountsIn, _scalingFactors());\n\n        uint256[] memory normalizedWeights = _normalizedWeights();\n\n        uint256 invariantAfterJoin = WeightedMath._calculateInvariant(normalizedWeights, amountsIn);\n\n        // Set the initial BPT to the value of the invariant times the number of tokens. This makes BPT supply more\n        // consistent in Pools with similar compositions but different number of tokens.\n        uint256 bptAmountOut = Math.mul(invariantAfterJoin, _getTotalTokens());\n\n        _lastInvariant = invariantAfterJoin;\n\n        return (bptAmountOut, amountsIn);\n    }\n\n    // Join\n\n    function _onJoinPool(\n        bytes32,\n        address,\n        address,\n        uint256[] memory balances,\n        uint256,\n        uint256 protocolSwapFeePercentage,\n        bytes memory userData\n    )\n        internal\n        virtual\n        override\n        whenNotPaused\n        returns (\n            uint256,\n            uint256[] memory,\n            uint256[] memory\n        )\n    {\n        // All joins are disabled while the contract is paused.\n\n        uint256[] memory normalizedWeights = _normalizedWeights();\n\n        // Due protocol swap fee amounts are computed by measuring the growth of the invariant between the previous join\n        // or exit event and now - the invariant's growth is due exclusively to swap fees. This avoids spending gas\n        // computing them on each individual swap\n        uint256 invariantBeforeJoin = WeightedMath._calculateInvariant(normalizedWeights, balances);\n\n        uint256[] memory dueProtocolFeeAmounts = _getDueProtocolFeeAmounts(\n            balances,\n            normalizedWeights,\n            _lastInvariant,\n            invariantBeforeJoin,\n            protocolSwapFeePercentage\n        );\n\n        // Update current balances by subtracting the protocol fee amounts\n        _mutateAmounts(balances, dueProtocolFeeAmounts, FixedPoint.sub);\n        (uint256 bptAmountOut, uint256[] memory amountsIn) = _doJoin(balances, normalizedWeights, userData);\n\n        // Update the invariant with the balances the Pool will have after the join, in order to compute the\n        // protocol swap fee amounts due in future joins and exits.\n        _lastInvariant = _invariantAfterJoin(balances, amountsIn, normalizedWeights);\n\n        return (bptAmountOut, amountsIn, dueProtocolFeeAmounts);\n    }\n\n    function _doJoin(\n        uint256[] memory balances,\n        uint256[] memory normalizedWeights,\n        bytes memory userData\n    ) private view returns (uint256, uint256[] memory) {\n        JoinKind kind = userData.joinKind();\n\n        if (kind == JoinKind.EXACT_TOKENS_IN_FOR_BPT_OUT) {\n            return _joinExactTokensInForBPTOut(balances, normalizedWeights, userData);\n        } else if (kind == JoinKind.TOKEN_IN_FOR_EXACT_BPT_OUT) {\n            return _joinTokenInForExactBPTOut(balances, normalizedWeights, userData);\n        } else {\n            _revert(Errors.UNHANDLED_JOIN_KIND);\n        }\n    }\n\n    function _joinExactTokensInForBPTOut(\n        uint256[] memory balances,\n        uint256[] memory normalizedWeights,\n        bytes memory userData\n    ) private view returns (uint256, uint256[] memory) {\n        (uint256[] memory amountsIn, uint256 minBPTAmountOut) = userData.exactTokensInForBptOut();\n        InputHelpers.ensureInputLengthMatch(_getTotalTokens(), amountsIn.length);\n\n        _upscaleArray(amountsIn, _scalingFactors());\n\n        uint256 bptAmountOut = WeightedMath._calcBptOutGivenExactTokensIn(\n            balances,\n            normalizedWeights,\n            amountsIn,\n            totalSupply(),\n            _swapFeePercentage\n        );\n\n        _require(bptAmountOut >= minBPTAmountOut, Errors.BPT_OUT_MIN_AMOUNT);\n\n        return (bptAmountOut, amountsIn);\n    }\n\n    function _joinTokenInForExactBPTOut(\n        uint256[] memory balances,\n        uint256[] memory normalizedWeights,\n        bytes memory userData\n    ) private view returns (uint256, uint256[] memory) {\n        (uint256 bptAmountOut, uint256 tokenIndex) = userData.tokenInForExactBptOut();\n        // Note that there is no maximum amountIn parameter: this is handled by `IVault.joinPool`.\n\n        _require(tokenIndex < _getTotalTokens(), Errors.OUT_OF_BOUNDS);\n\n        uint256[] memory amountsIn = new uint256[](_getTotalTokens());\n        amountsIn[tokenIndex] = WeightedMath._calcTokenInGivenExactBptOut(\n            balances[tokenIndex],\n            normalizedWeights[tokenIndex],\n            bptAmountOut,\n            totalSupply(),\n            _swapFeePercentage\n        );\n\n        return (bptAmountOut, amountsIn);\n    }\n\n    // Exit\n\n    function _onExitPool(\n        bytes32,\n        address,\n        address,\n        uint256[] memory balances,\n        uint256,\n        uint256 protocolSwapFeePercentage,\n        bytes memory userData\n    )\n        internal\n        virtual\n        override\n        returns (\n            uint256 bptAmountIn,\n            uint256[] memory amountsOut,\n            uint256[] memory dueProtocolFeeAmounts\n        )\n    {\n        // Exits are not completely disabled while the contract is paused: proportional exits (exact BPT in for tokens\n        // out) remain functional.\n\n        uint256[] memory normalizedWeights = _normalizedWeights();\n\n        if (_isNotPaused()) {\n            // Due protocol swap fee amounts are computed by measuring the growth of the invariant between the previous\n            // join or exit event and now - the invariant's growth is due exclusively to swap fees. This avoids\n            // spending gas calculating the fees on each individual swap.\n            uint256 invariantBeforeExit = WeightedMath._calculateInvariant(normalizedWeights, balances);\n            dueProtocolFeeAmounts = _getDueProtocolFeeAmounts(\n                balances,\n                normalizedWeights,\n                _lastInvariant,\n                invariantBeforeExit,\n                protocolSwapFeePercentage\n            );\n\n            // Update current balances by subtracting the protocol fee amounts\n            _mutateAmounts(balances, dueProtocolFeeAmounts, FixedPoint.sub);\n        } else {\n            // If the contract is paused, swap protocol fee amounts are not charged to avoid extra calculations and\n            // reduce the potential for errors.\n            dueProtocolFeeAmounts = new uint256[](_getTotalTokens());\n        }\n\n        (bptAmountIn, amountsOut) = _doExit(balances, normalizedWeights, userData);\n\n        // Update the invariant with the balances the Pool will have after the exit, in order to compute the\n        // protocol swap fees due in future joins and exits.\n        _lastInvariant = _invariantAfterExit(balances, amountsOut, normalizedWeights);\n\n        return (bptAmountIn, amountsOut, dueProtocolFeeAmounts);\n    }\n\n    function _doExit(\n        uint256[] memory balances,\n        uint256[] memory normalizedWeights,\n        bytes memory userData\n    ) private view returns (uint256, uint256[] memory) {\n        ExitKind kind = userData.exitKind();\n\n        if (kind == ExitKind.EXACT_BPT_IN_FOR_ONE_TOKEN_OUT) {\n            return _exitExactBPTInForTokenOut(balances, normalizedWeights, userData);\n        } else if (kind == ExitKind.EXACT_BPT_IN_FOR_TOKENS_OUT) {\n            return _exitExactBPTInForTokensOut(balances, userData);\n        } else {\n            // ExitKind.BPT_IN_FOR_EXACT_TOKENS_OUT\n            return _exitBPTInForExactTokensOut(balances, normalizedWeights, userData);\n        }\n    }\n\n    function _exitExactBPTInForTokenOut(\n        uint256[] memory balances,\n        uint256[] memory normalizedWeights,\n        bytes memory userData\n    ) private view whenNotPaused returns (uint256, uint256[] memory) {\n        // This exit function is disabled if the contract is paused.\n\n        (uint256 bptAmountIn, uint256 tokenIndex) = userData.exactBptInForTokenOut();\n        // Note that there is no minimum amountOut parameter: this is handled by `IVault.exitPool`.\n\n        _require(tokenIndex < _getTotalTokens(), Errors.OUT_OF_BOUNDS);\n\n        // We exit in a single token, so we initialize amountsOut with zeros\n        uint256[] memory amountsOut = new uint256[](_getTotalTokens());\n\n        // And then assign the result to the selected token\n        amountsOut[tokenIndex] = WeightedMath._calcTokenOutGivenExactBptIn(\n            balances[tokenIndex],\n            normalizedWeights[tokenIndex],\n            bptAmountIn,\n            totalSupply(),\n            _swapFeePercentage\n        );\n\n        return (bptAmountIn, amountsOut);\n    }\n\n    function _exitExactBPTInForTokensOut(uint256[] memory balances, bytes memory userData)\n        private\n        view\n        returns (uint256, uint256[] memory)\n    {\n        // This exit function is the only one that is not disabled if the contract is paused: it remains unrestricted\n        // in an attempt to provide users with a mechanism to retrieve their tokens in case of an emergency.\n        // This particular exit function is the only one that remains available because it is the simplest one, and\n        // therefore the one with the lowest likelihood of errors.\n\n        uint256 bptAmountIn = userData.exactBptInForTokensOut();\n        // Note that there is no minimum amountOut parameter: this is handled by `IVault.exitPool`.\n\n        uint256[] memory amountsOut = WeightedMath._calcTokensOutGivenExactBptIn(balances, bptAmountIn, totalSupply());\n        return (bptAmountIn, amountsOut);\n    }\n\n    function _exitBPTInForExactTokensOut(\n        uint256[] memory balances,\n        uint256[] memory normalizedWeights,\n        bytes memory userData\n    ) private view whenNotPaused returns (uint256, uint256[] memory) {\n        // This exit function is disabled if the contract is paused.\n\n        (uint256[] memory amountsOut, uint256 maxBPTAmountIn) = userData.bptInForExactTokensOut();\n        InputHelpers.ensureInputLengthMatch(amountsOut.length, _getTotalTokens());\n        _upscaleArray(amountsOut, _scalingFactors());\n\n        uint256 bptAmountIn = WeightedMath._calcBptInGivenExactTokensOut(\n            balances,\n            normalizedWeights,\n            amountsOut,\n            totalSupply(),\n            _swapFeePercentage\n        );\n        _require(bptAmountIn <= maxBPTAmountIn, Errors.BPT_IN_MAX_AMOUNT);\n\n        return (bptAmountIn, amountsOut);\n    }\n\n    // Helpers\n\n    function _getDueProtocolFeeAmounts(\n        uint256[] memory balances,\n        uint256[] memory normalizedWeights,\n        uint256 previousInvariant,\n        uint256 currentInvariant,\n        uint256 protocolSwapFeePercentage\n    ) private view returns (uint256[] memory) {\n        // Initialize with zeros\n        uint256[] memory dueProtocolFeeAmounts = new uint256[](_getTotalTokens());\n\n        // Early return if the protocol swap fee percentage is zero, saving gas.\n        if (protocolSwapFeePercentage == 0) {\n            return dueProtocolFeeAmounts;\n        }\n\n        // The protocol swap fees are always paid using the token with the largest weight in the Pool. As this is the\n        // token that is expected to have the largest balance, using it to pay fees should not unbalance the Pool.\n        dueProtocolFeeAmounts[_maxWeightTokenIndex] = WeightedMath._calcDueTokenProtocolSwapFeeAmount(\n            balances[_maxWeightTokenIndex],\n            normalizedWeights[_maxWeightTokenIndex],\n            previousInvariant,\n            currentInvariant,\n            protocolSwapFeePercentage\n        );\n\n        return dueProtocolFeeAmounts;\n    }\n\n    /**\n     * @dev Returns the value of the invariant given `balances`, assuming they are increased by `amountsIn`. All\n     * amounts are expected to be upscaled.\n     */\n    function _invariantAfterJoin(\n        uint256[] memory balances,\n        uint256[] memory amountsIn,\n        uint256[] memory normalizedWeights\n    ) private view returns (uint256) {\n        _mutateAmounts(balances, amountsIn, FixedPoint.add);\n        return WeightedMath._calculateInvariant(normalizedWeights, balances);\n    }\n\n    function _invariantAfterExit(\n        uint256[] memory balances,\n        uint256[] memory amountsOut,\n        uint256[] memory normalizedWeights\n    ) private view returns (uint256) {\n        _mutateAmounts(balances, amountsOut, FixedPoint.sub);\n        return WeightedMath._calculateInvariant(normalizedWeights, balances);\n    }\n\n    /**\n     * @dev Mutates `amounts` by applying `mutation` with each entry in `arguments`.\n     *\n     * Equivalent to `amounts = amounts.map(mutation)`.\n     */\n    function _mutateAmounts(\n        uint256[] memory toMutate,\n        uint256[] memory arguments,\n        function(uint256, uint256) pure returns (uint256) mutation\n    ) private view {\n        for (uint256 i = 0; i < _getTotalTokens(); ++i) {\n            toMutate[i] = mutation(toMutate[i], arguments[i]);\n        }\n    }\n\n    /**\n     * @dev This function returns the appreciation of one BPT relative to the\n     * underlying tokens. This starts at 1 when the pool is created and grows over time\n     */\n    function getRate() public view returns (uint256) {\n        // The initial BPT supply is equal to the invariant times the number of tokens.\n        return Math.mul(getInvariant(), _getTotalTokens()).divDown(totalSupply());\n    }\n}\n"
    },
    "contracts/lib/openzeppelin/IERC20.sol": {
      "content": "// SPDX-License-Identifier: MIT\n\npragma solidity ^0.7.0;\n\n/**\n * @dev Interface of the ERC20 standard as defined in the EIP.\n */\ninterface IERC20 {\n    /**\n     * @dev Returns the amount of tokens in existence.\n     */\n    function totalSupply() external view returns (uint256);\n\n    /**\n     * @dev Returns the amount of tokens owned by `account`.\n     */\n    function balanceOf(address account) external view returns (uint256);\n\n    /**\n     * @dev Moves `amount` tokens from the caller's account to `recipient`.\n     *\n     * Returns a boolean value indicating whether the operation succeeded.\n     *\n     * Emits a {Transfer} event.\n     */\n    function transfer(address recipient, uint256 amount) external returns (bool);\n\n    /**\n     * @dev Returns the remaining number of tokens that `spender` will be\n     * allowed to spend on behalf of `owner` through {transferFrom}. This is\n     * zero by default.\n     *\n     * This value changes when {approve} or {transferFrom} are called.\n     */\n    function allowance(address owner, address spender) external view returns (uint256);\n\n    /**\n     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.\n     *\n     * Returns a boolean value indicating whether the operation succeeded.\n     *\n     * IMPORTANT: Beware that changing an allowance with this method brings the risk\n     * that someone may use both the old and the new allowance by unfortunate\n     * transaction ordering. One possible solution to mitigate this race\n     * condition is to first reduce the spender's allowance to 0 and set the\n     * desired value afterwards:\n     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729\n     *\n     * Emits an {Approval} event.\n     */\n    function approve(address spender, uint256 amount) external returns (bool);\n\n    /**\n     * @dev Moves `amount` tokens from `sender` to `recipient` using the\n     * allowance mechanism. `amount` is then deducted from the caller's\n     * allowance.\n     *\n     * Returns a boolean value indicating whether the operation succeeded.\n     *\n     * Emits a {Transfer} event.\n     */\n    function transferFrom(\n        address sender,\n        address recipient,\n        uint256 amount\n    ) external returns (bool);\n\n    /**\n     * @dev Emitted when `value` tokens are moved from one account (`from`) to\n     * another (`to`).\n     *\n     * Note that `value` may be zero.\n     */\n    event Transfer(address indexed from, address indexed to, uint256 value);\n\n    /**\n     * @dev Emitted when the allowance of a `spender` for an `owner` is set by\n     * a call to {approve}. `value` is the new allowance.\n     */\n    event Approval(address indexed owner, address indexed spender, uint256 value);\n}\n"
    },
    "contracts/vault/interfaces/IWETH.sol": {
      "content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program.  If not, see <http://www.gnu.org/licenses/>.\n\npragma solidity ^0.7.0;\n\nimport \"../../lib/openzeppelin/IERC20.sol\";\n\n/**\n * @dev Interface for the WETH token contract used internally for wrapping and unwrapping, to support\n * sending and receiving ETH in joins, swaps, and internal balance deposits and withdrawals.\n */\ninterface IWETH is IERC20 {\n    function deposit() external payable;\n\n    function withdraw(uint256 amount) external;\n}\n"
    },
    "contracts/vault/interfaces/IAsset.sol": {
      "content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program.  If not, see <http://www.gnu.org/licenses/>.\n\npragma solidity ^0.7.0;\n\n/**\n * @dev This is an empty interface used to represent either ERC20-conforming token contracts or ETH (using the zero\n * address sentinel value). We're just relying on the fact that `interface` can be used to declare new address-like\n * types.\n *\n * This concept is unrelated to a Pool's Asset Managers.\n */\ninterface IAsset {\n    // solhint-disable-previous-line no-empty-blocks\n}\n"
    },
    "contracts/vault/interfaces/IAuthorizer.sol": {
      "content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program.  If not, see <http://www.gnu.org/licenses/>.\n\npragma solidity ^0.7.0;\n\ninterface IAuthorizer {\n    /**\n     * @dev Returns true if `account` can perform the action described by `actionId` in the contract `where`.\n     */\n    function canPerform(\n        bytes32 actionId,\n        address account,\n        address where\n    ) external view returns (bool);\n}\n"
    },
    "contracts/vault/interfaces/IFlashLoanRecipient.sol": {
      "content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program.  If not, see <http://www.gnu.org/licenses/>.\n\npragma solidity ^0.7.0;\n\n// Inspired by Aave Protocol's IFlashLoanReceiver.\n\nimport \"../../lib/openzeppelin/IERC20.sol\";\n\ninterface IFlashLoanRecipient {\n    /**\n     * @dev When `flashLoan` is called on the Vault, it invokes the `receiveFlashLoan` hook on the recipient.\n     *\n     * At the time of the call, the Vault will have transferred `amounts` for `tokens` to the recipient. Before this\n     * call returns, the recipient must have transferred `amounts` plus `feeAmounts` for each token back to the\n     * Vault, or else the entire flash loan will revert.\n     *\n     * `userData` is the same value passed in the `IVault.flashLoan` call.\n     */\n    function receiveFlashLoan(\n        IERC20[] memory tokens,\n        uint256[] memory amounts,\n        uint256[] memory feeAmounts,\n        bytes memory userData\n    ) external;\n}\n"
    },
    "contracts/vault/ProtocolFeesCollector.sol": {
      "content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program.  If not, see <http://www.gnu.org/licenses/>.\n\npragma solidity ^0.7.0;\npragma experimental ABIEncoderV2;\n\nimport \"../lib/openzeppelin/IERC20.sol\";\nimport \"../lib/helpers/InputHelpers.sol\";\nimport \"../lib/helpers/Authentication.sol\";\nimport \"../lib/openzeppelin/ReentrancyGuard.sol\";\nimport \"../lib/openzeppelin/SafeERC20.sol\";\n\nimport \"./interfaces/IVault.sol\";\nimport \"./interfaces/IAuthorizer.sol\";\n\n/**\n * @dev This an auxiliary contract to the Vault, deployed by it during construction. It offloads some of the tasks the\n * Vault performs to reduce its overall bytecode size.\n *\n * The current values for all protocol fee percentages are stored here, and any tokens charged as protocol fees are\n * sent to this contract, where they may be withdrawn by authorized entities. All authorization tasks are delegated\n * to the Vault's own authorizer.\n */\ncontract ProtocolFeesCollector is Authentication, ReentrancyGuard {\n    using SafeERC20 for IERC20;\n\n    // Absolute maximum fee percentages (1e18 = 100%, 1e16 = 1%).\n    uint256 private constant _MAX_PROTOCOL_SWAP_FEE_PERCENTAGE = 50e16; // 50%\n    uint256 private constant _MAX_PROTOCOL_FLASH_LOAN_FEE_PERCENTAGE = 1e16; // 1%\n\n    IVault public immutable vault;\n\n    // All fee percentages are 18-decimal fixed point numbers.\n\n    // The swap fee is charged whenever a swap occurs, as a percentage of the fee charged by the Pool. These are not\n    // actually charged on each individual swap: the `Vault` relies on the Pools being honest and reporting fees due\n    // when users join and exit them.\n    uint256 private _swapFeePercentage;\n\n    // The flash loan fee is charged whenever a flash loan occurs, as a percentage of the tokens lent.\n    uint256 private _flashLoanFeePercentage;\n\n    event SwapFeePercentageChanged(uint256 newSwapFeePercentage);\n    event FlashLoanFeePercentageChanged(uint256 newFlashLoanFeePercentage);\n\n    constructor(IVault _vault)\n        // The ProtocolFeesCollector is a singleton, so it simply uses its own address to disambiguate action\n        // identifiers.\n        Authentication(bytes32(uint256(address(this))))\n    {\n        vault = _vault;\n    }\n\n    function withdrawCollectedFees(\n        IERC20[] calldata tokens,\n        uint256[] calldata amounts,\n        address recipient\n    ) external nonReentrant authenticate {\n        InputHelpers.ensureInputLengthMatch(tokens.length, amounts.length);\n\n        for (uint256 i = 0; i < tokens.length; ++i) {\n            IERC20 token = tokens[i];\n            uint256 amount = amounts[i];\n            token.safeTransfer(recipient, amount);\n        }\n    }\n\n    function setSwapFeePercentage(uint256 newSwapFeePercentage) external authenticate {\n        _require(newSwapFeePercentage <= _MAX_PROTOCOL_SWAP_FEE_PERCENTAGE, Errors.SWAP_FEE_PERCENTAGE_TOO_HIGH);\n        _swapFeePercentage = newSwapFeePercentage;\n        emit SwapFeePercentageChanged(newSwapFeePercentage);\n    }\n\n    function setFlashLoanFeePercentage(uint256 newFlashLoanFeePercentage) external authenticate {\n        _require(\n            newFlashLoanFeePercentage <= _MAX_PROTOCOL_FLASH_LOAN_FEE_PERCENTAGE,\n            Errors.FLASH_LOAN_FEE_PERCENTAGE_TOO_HIGH\n        );\n        _flashLoanFeePercentage = newFlashLoanFeePercentage;\n        emit FlashLoanFeePercentageChanged(newFlashLoanFeePercentage);\n    }\n\n    function getSwapFeePercentage() external view returns (uint256) {\n        return _swapFeePercentage;\n    }\n\n    function getFlashLoanFeePercentage() external view returns (uint256) {\n        return _flashLoanFeePercentage;\n    }\n\n    function getCollectedFeeAmounts(IERC20[] memory tokens) external view returns (uint256[] memory feeAmounts) {\n        feeAmounts = new uint256[](tokens.length);\n        for (uint256 i = 0; i < tokens.length; ++i) {\n            feeAmounts[i] = tokens[i].balanceOf(address(this));\n        }\n    }\n\n    function getAuthorizer() external view returns (IAuthorizer) {\n        return _getAuthorizer();\n    }\n\n    function _canPerform(bytes32 actionId, address account) internal view override returns (bool) {\n        return _getAuthorizer().canPerform(actionId, account, address(this));\n    }\n\n    function _getAuthorizer() internal view returns (IAuthorizer) {\n        return vault.getAuthorizer();\n    }\n}\n"
    },
    "contracts/lib/helpers/ISignaturesValidator.sol": {
      "content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program.  If not, see <http://www.gnu.org/licenses/>.\n\npragma solidity ^0.7.0;\n\n/**\n * @dev Interface for the SignatureValidator helper, used to support meta-transactions.\n */\ninterface ISignaturesValidator {\n    /**\n     * @dev Returns the EIP712 domain separator.\n     */\n    function getDomainSeparator() external view returns (bytes32);\n\n    /**\n     * @dev Returns the next nonce used by an address to sign messages.\n     */\n    function getNextNonce(address user) external view returns (uint256);\n}\n"
    },
    "contracts/lib/helpers/ITemporarilyPausable.sol": {
      "content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program.  If not, see <http://www.gnu.org/licenses/>.\n\npragma solidity ^0.7.0;\n\n/**\n * @dev Interface for the TemporarilyPausable helper.\n */\ninterface ITemporarilyPausable {\n    /**\n     * @dev Emitted every time the pause state changes by `_setPaused`.\n     */\n    event PausedStateChanged(bool paused);\n\n    /**\n     * @dev Returns the current paused state.\n     */\n    function getPausedState()\n        external\n        view\n        returns (\n            bool paused,\n            uint256 pauseWindowEndTime,\n            uint256 bufferPeriodEndTime\n        );\n}\n"
    },
    "contracts/lib/helpers/InputHelpers.sol": {
      "content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program.  If not, see <http://www.gnu.org/licenses/>.\n\npragma solidity ^0.7.0;\n\nimport \"../openzeppelin/IERC20.sol\";\n\nimport \"./BalancerErrors.sol\";\n\nimport \"../../vault/interfaces/IAsset.sol\";\n\nlibrary InputHelpers {\n    function ensureInputLengthMatch(uint256 a, uint256 b) internal pure {\n        _require(a == b, Errors.INPUT_LENGTH_MISMATCH);\n    }\n\n    function ensureInputLengthMatch(\n        uint256 a,\n        uint256 b,\n        uint256 c\n    ) internal pure {\n        _require(a == b && b == c, Errors.INPUT_LENGTH_MISMATCH);\n    }\n\n    function ensureArrayIsSorted(IAsset[] memory array) internal pure {\n        address[] memory addressArray;\n        // solhint-disable-next-line no-inline-assembly\n        assembly {\n            addressArray := array\n        }\n        ensureArrayIsSorted(addressArray);\n    }\n\n    function ensureArrayIsSorted(IERC20[] memory array) internal pure {\n        address[] memory addressArray;\n        // solhint-disable-next-line no-inline-assembly\n        assembly {\n            addressArray := array\n        }\n        ensureArrayIsSorted(addressArray);\n    }\n\n    function ensureArrayIsSorted(address[] memory array) internal pure {\n        if (array.length < 2) {\n            return;\n        }\n\n        address previous = array[0];\n        for (uint256 i = 1; i < array.length; ++i) {\n            address current = array[i];\n            _require(previous < current, Errors.UNSORTED_ARRAY);\n            previous = current;\n        }\n    }\n}\n"
    },
    "contracts/lib/helpers/Authentication.sol": {
      "content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program.  If not, see <http://www.gnu.org/licenses/>.\n\npragma solidity ^0.7.0;\n\nimport \"./BalancerErrors.sol\";\nimport \"./IAuthentication.sol\";\n\n/**\n * @dev Building block for performing access control on external functions.\n *\n * This contract is used via the `authenticate` modifier (or the `_authenticateCaller` function), which can be applied\n * to external functions to only make them callable by authorized accounts.\n *\n * Derived contracts must implement the `_canPerform` function, which holds the actual access control logic.\n */\nabstract contract Authentication is IAuthentication {\n    bytes32 private immutable _actionIdDisambiguator;\n\n    /**\n     * @dev The main purpose of the `actionIdDisambiguator` is to prevent accidental function selector collisions in\n     * multi contract systems.\n     *\n     * There are two main uses for it:\n     *  - if the contract is a singleton, any unique identifier can be used to make the associated action identifiers\n     *    unique. The contract's own address is a good option.\n     *  - if the contract belongs to a family that shares action identifiers for the same functions, an identifier\n     *    shared by the entire family (and no other contract) should be used instead.\n     */\n    constructor(bytes32 actionIdDisambiguator) {\n        _actionIdDisambiguator = actionIdDisambiguator;\n    }\n\n    /**\n     * @dev Reverts unless the caller is allowed to call this function. Should only be applied to external functions.\n     */\n    modifier authenticate() {\n        _authenticateCaller();\n        _;\n    }\n\n    /**\n     * @dev Reverts unless the caller is allowed to call the entry point function.\n     */\n    function _authenticateCaller() internal view {\n        bytes32 actionId = getActionId(msg.sig);\n        _require(_canPerform(actionId, msg.sender), Errors.SENDER_NOT_ALLOWED);\n    }\n\n    function getActionId(bytes4 selector) public view override returns (bytes32) {\n        // Each external function is dynamically assigned an action identifier as the hash of the disambiguator and the\n        // function selector. Disambiguation is necessary to avoid potential collisions in the function selectors of\n        // multiple contracts.\n        return keccak256(abi.encodePacked(_actionIdDisambiguator, selector));\n    }\n\n    function _canPerform(bytes32 actionId, address user) internal view virtual returns (bool);\n}\n"
    },
    "contracts/lib/openzeppelin/ReentrancyGuard.sol": {
      "content": "// SPDX-License-Identifier: MIT\n\npragma solidity ^0.7.0;\n\nimport \"../helpers/BalancerErrors.sol\";\n\n// Based on the ReentrancyGuard library from OpenZeppelin contracts, altered to reduce bytecode size.\n// Modifier code is inlined by the compiler, which causes its code to appear multiple times in the codebase. By using\n// private functions, we achieve the same end result with slightly higher runtime gas costs but reduced bytecode size.\n\n/**\n * @dev Contract module that helps prevent reentrant calls to a function.\n *\n * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier\n * available, which can be applied to functions to make sure there are no nested\n * (reentrant) calls to them.\n *\n * Note that because there is a single `nonReentrant` guard, functions marked as\n * `nonReentrant` may not call one another. This can be worked around by making\n * those functions `private`, and then adding `external` `nonReentrant` entry\n * points to them.\n *\n * TIP: If you would like to learn more about reentrancy and alternative ways\n * to protect against it, check out our blog post\n * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].\n */\nabstract contract ReentrancyGuard {\n    // Booleans are more expensive than uint256 or any type that takes up a full\n    // word because each write operation emits an extra SLOAD to first read the\n    // slot's contents, replace the bits taken up by the boolean, and then write\n    // back. This is the compiler's defense against contract upgrades and\n    // pointer aliasing, and it cannot be disabled.\n\n    // The values being non-zero value makes deployment a bit more expensive,\n    // but in exchange the refund on every call to nonReentrant will be lower in\n    // amount. Since refunds are capped to a percentage of the total\n    // transaction's gas, it is best to keep them low in cases like this one, to\n    // increase the likelihood of the full refund coming into effect.\n    uint256 private constant _NOT_ENTERED = 1;\n    uint256 private constant _ENTERED = 2;\n\n    uint256 private _status;\n\n    constructor() {\n        _status = _NOT_ENTERED;\n    }\n\n    /**\n     * @dev Prevents a contract from calling itself, directly or indirectly.\n     * Calling a `nonReentrant` function from another `nonReentrant`\n     * function is not supported. It is possible to prevent this from happening\n     * by making the `nonReentrant` function external, and make it call a\n     * `private` function that does the actual work.\n     */\n    modifier nonReentrant() {\n        _enterNonReentrant();\n        _;\n        _exitNonReentrant();\n    }\n\n    function _enterNonReentrant() private {\n        // On the first call to nonReentrant, _status will be _NOT_ENTERED\n        _require(_status != _ENTERED, Errors.REENTRANCY);\n\n        // Any calls to nonReentrant after this point will fail\n        _status = _ENTERED;\n    }\n\n    function _exitNonReentrant() private {\n        // By storing the original value once again, a refund is triggered (see\n        // https://eips.ethereum.org/EIPS/eip-2200)\n        _status = _NOT_ENTERED;\n    }\n}\n"
    },
    "contracts/lib/openzeppelin/SafeERC20.sol": {
      "content": "// SPDX-License-Identifier: MIT\n\npragma solidity ^0.7.0;\n\nimport \"../helpers/BalancerErrors.sol\";\n\nimport \"./IERC20.sol\";\n\n/**\n * @title SafeERC20\n * @dev Wrappers around ERC20 operations that throw on failure (when the token\n * contract returns false). Tokens that return no value (and instead revert or\n * throw on failure) are also supported, non-reverting calls are assumed to be\n * successful.\n * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,\n * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.\n */\nlibrary SafeERC20 {\n    function safeTransfer(\n        IERC20 token,\n        address to,\n        uint256 value\n    ) internal {\n        _callOptionalReturn(address(token), abi.encodeWithSelector(token.transfer.selector, to, value));\n    }\n\n    function safeTransferFrom(\n        IERC20 token,\n        address from,\n        address to,\n        uint256 value\n    ) internal {\n        _callOptionalReturn(address(token), abi.encodeWithSelector(token.transferFrom.selector, from, to, value));\n    }\n\n    /**\n     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement\n     * on the return value: the return value is optional (but if data is returned, it must not be false).\n     *\n     * WARNING: `token` is assumed to be a contract: calls to EOAs will *not* revert.\n     */\n    function _callOptionalReturn(address token, bytes memory data) private {\n        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since\n        // we're implementing it ourselves.\n        (bool success, bytes memory returndata) = token.call(data);\n\n        // If the low-level call didn't succeed we return whatever was returned from it.\n        assembly {\n            if eq(success, 0) {\n                returndatacopy(0, 0, returndatasize())\n                revert(0, returndatasize())\n            }\n        }\n\n        // Finally we check the returndata size is either zero or true - note that this check will always pass for EOAs\n        _require(returndata.length == 0 || abi.decode(returndata, (bool)), Errors.SAFE_ERC20_CALL_FAILED);\n    }\n}\n"
    },
    "contracts/lib/helpers/BalancerErrors.sol": {
      "content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program.  If not, see <http://www.gnu.org/licenses/>.\n\npragma solidity ^0.7.0;\n\n// solhint-disable\n\n/**\n * @dev Reverts if `condition` is false, with a revert reason containing `errorCode`. Only codes up to 999 are\n * supported.\n */\nfunction _require(bool condition, uint256 errorCode) pure {\n    if (!condition) _revert(errorCode);\n}\n\n/**\n * @dev Reverts with a revert reason containing `errorCode`. Only codes up to 999 are supported.\n */\nfunction _revert(uint256 errorCode) pure {\n    // We're going to dynamically create a revert string based on the error code, with the following format:\n    // 'BAL#{errorCode}'\n    // where the code is left-padded with zeroes to three digits (so they range from 000 to 999).\n    //\n    // We don't have revert strings embedded in the contract to save bytecode size: it takes much less space to store a\n    // number (8 to 16 bits) than the individual string characters.\n    //\n    // The dynamic string creation algorithm that follows could be implemented in Solidity, but assembly allows for a\n    // much denser implementation, again saving bytecode size. Given this function unconditionally reverts, this is a\n    // safe place to rely on it without worrying about how its usage might affect e.g. memory contents.\n    assembly {\n        // First, we need to compute the ASCII representation of the error code. We assume that it is in the 0-999\n        // range, so we only need to convert three digits. To convert the digits to ASCII, we add 0x30, the value for\n        // the '0' character.\n\n        let units := add(mod(errorCode, 10), 0x30)\n\n        errorCode := div(errorCode, 10)\n        let tenths := add(mod(errorCode, 10), 0x30)\n\n        errorCode := div(errorCode, 10)\n        let hundreds := add(mod(errorCode, 10), 0x30)\n\n        // With the individual characters, we can now construct the full string. The \"BAL#\" part is a known constant\n        // (0x42414c23): we simply shift this by 24 (to provide space for the 3 bytes of the error code), and add the\n        // characters to it, each shifted by a multiple of 8.\n        // The revert reason is then shifted left by 200 bits (256 minus the length of the string, 7 characters * 8 bits\n        // per character = 56) to locate it in the most significant part of the 256 slot (the beginning of a byte\n        // array).\n\n        let revertReason := shl(200, add(0x42414c23000000, add(add(units, shl(8, tenths)), shl(16, hundreds))))\n\n        // We can now encode the reason in memory, which can be safely overwritten as we're about to revert. The encoded\n        // message will have the following layout:\n        // [ revert reason identifier ] [ string location offset ] [ string length ] [ string contents ]\n\n        // The Solidity revert reason identifier is 0x08c739a0, the function selector of the Error(string) function. We\n        // also write zeroes to the next 28 bytes of memory, but those are about to be overwritten.\n        mstore(0x0, 0x08c379a000000000000000000000000000000000000000000000000000000000)\n        // Next is the offset to the location of the string, which will be placed immediately after (20 bytes away).\n        mstore(0x04, 0x0000000000000000000000000000000000000000000000000000000000000020)\n        // The string length is fixed: 7 characters.\n        mstore(0x24, 7)\n        // Finally, the string itself is stored.\n        mstore(0x44, revertReason)\n\n        // Even if the string is only 7 bytes long, we need to return a full 32 byte slot containing it. The length of\n        // the encoded message is therefore 4 + 32 + 32 + 32 = 100.\n        revert(0, 100)\n    }\n}\n\nlibrary Errors {\n    // Math\n    uint256 internal constant ADD_OVERFLOW = 0;\n    uint256 internal constant SUB_OVERFLOW = 1;\n    uint256 internal constant SUB_UNDERFLOW = 2;\n    uint256 internal constant MUL_OVERFLOW = 3;\n    uint256 internal constant ZERO_DIVISION = 4;\n    uint256 internal constant DIV_INTERNAL = 5;\n    uint256 internal constant X_OUT_OF_BOUNDS = 6;\n    uint256 internal constant Y_OUT_OF_BOUNDS = 7;\n    uint256 internal constant PRODUCT_OUT_OF_BOUNDS = 8;\n    uint256 internal constant INVALID_EXPONENT = 9;\n\n    // Input\n    uint256 internal constant OUT_OF_BOUNDS = 100;\n    uint256 internal constant UNSORTED_ARRAY = 101;\n    uint256 internal constant UNSORTED_TOKENS = 102;\n    uint256 internal constant INPUT_LENGTH_MISMATCH = 103;\n    uint256 internal constant ZERO_TOKEN = 104;\n\n    // Shared pools\n    uint256 internal constant MIN_TOKENS = 200;\n    uint256 internal constant MAX_TOKENS = 201;\n    uint256 internal constant MAX_SWAP_FEE_PERCENTAGE = 202;\n    uint256 internal constant MIN_SWAP_FEE_PERCENTAGE = 203;\n    uint256 internal constant MINIMUM_BPT = 204;\n    uint256 internal constant CALLER_NOT_VAULT = 205;\n    uint256 internal constant UNINITIALIZED = 206;\n    uint256 internal constant BPT_IN_MAX_AMOUNT = 207;\n    uint256 internal constant BPT_OUT_MIN_AMOUNT = 208;\n    uint256 internal constant EXPIRED_PERMIT = 209;\n\n    // Pools\n    uint256 internal constant MIN_AMP = 300;\n    uint256 internal constant MAX_AMP = 301;\n    uint256 internal constant MIN_WEIGHT = 302;\n    uint256 internal constant MAX_STABLE_TOKENS = 303;\n    uint256 internal constant MAX_IN_RATIO = 304;\n    uint256 internal constant MAX_OUT_RATIO = 305;\n    uint256 internal constant MIN_BPT_IN_FOR_TOKEN_OUT = 306;\n    uint256 internal constant MAX_OUT_BPT_FOR_TOKEN_IN = 307;\n    uint256 internal constant NORMALIZED_WEIGHT_INVARIANT = 308;\n    uint256 internal constant INVALID_TOKEN = 309;\n    uint256 internal constant UNHANDLED_JOIN_KIND = 310;\n    uint256 internal constant ZERO_INVARIANT = 311;\n\n    // Lib\n    uint256 internal constant REENTRANCY = 400;\n    uint256 internal constant SENDER_NOT_ALLOWED = 401;\n    uint256 internal constant PAUSED = 402;\n    uint256 internal constant PAUSE_WINDOW_EXPIRED = 403;\n    uint256 internal constant MAX_PAUSE_WINDOW_DURATION = 404;\n    uint256 internal constant MAX_BUFFER_PERIOD_DURATION = 405;\n    uint256 internal constant INSUFFICIENT_BALANCE = 406;\n    uint256 internal constant INSUFFICIENT_ALLOWANCE = 407;\n    uint256 internal constant ERC20_TRANSFER_FROM_ZERO_ADDRESS = 408;\n    uint256 internal constant ERC20_TRANSFER_TO_ZERO_ADDRESS = 409;\n    uint256 internal constant ERC20_MINT_TO_ZERO_ADDRESS = 410;\n    uint256 internal constant ERC20_BURN_FROM_ZERO_ADDRESS = 411;\n    uint256 internal constant ERC20_APPROVE_FROM_ZERO_ADDRESS = 412;\n    uint256 internal constant ERC20_APPROVE_TO_ZERO_ADDRESS = 413;\n    uint256 internal constant ERC20_TRANSFER_EXCEEDS_ALLOWANCE = 414;\n    uint256 internal constant ERC20_DECREASED_ALLOWANCE_BELOW_ZERO = 415;\n    uint256 internal constant ERC20_TRANSFER_EXCEEDS_BALANCE = 416;\n    uint256 internal constant ERC20_BURN_EXCEEDS_ALLOWANCE = 417;\n    uint256 internal constant SAFE_ERC20_CALL_FAILED = 418;\n    uint256 internal constant ADDRESS_INSUFFICIENT_BALANCE = 419;\n    uint256 internal constant ADDRESS_CANNOT_SEND_VALUE = 420;\n    uint256 internal constant SAFE_CAST_VALUE_CANT_FIT_INT256 = 421;\n    uint256 internal constant GRANT_SENDER_NOT_ADMIN = 422;\n    uint256 internal constant REVOKE_SENDER_NOT_ADMIN = 423;\n    uint256 internal constant RENOUNCE_SENDER_NOT_ALLOWED = 424;\n    uint256 internal constant BUFFER_PERIOD_EXPIRED = 425;\n\n    // Vault\n    uint256 internal constant INVALID_POOL_ID = 500;\n    uint256 internal constant CALLER_NOT_POOL = 501;\n    uint256 internal constant SENDER_NOT_ASSET_MANAGER = 502;\n    uint256 internal constant USER_DOESNT_ALLOW_RELAYER = 503;\n    uint256 internal constant INVALID_SIGNATURE = 504;\n    uint256 internal constant EXIT_BELOW_MIN = 505;\n    uint256 internal constant JOIN_ABOVE_MAX = 506;\n    uint256 internal constant SWAP_LIMIT = 507;\n    uint256 internal constant SWAP_DEADLINE = 508;\n    uint256 internal constant CANNOT_SWAP_SAME_TOKEN = 509;\n    uint256 internal constant UNKNOWN_AMOUNT_IN_FIRST_SWAP = 510;\n    uint256 internal constant MALCONSTRUCTED_MULTIHOP_SWAP = 511;\n    uint256 internal constant INTERNAL_BALANCE_OVERFLOW = 512;\n    uint256 internal constant INSUFFICIENT_INTERNAL_BALANCE = 513;\n    uint256 internal constant INVALID_ETH_INTERNAL_BALANCE = 514;\n    uint256 internal constant INVALID_POST_LOAN_BALANCE = 515;\n    uint256 internal constant INSUFFICIENT_ETH = 516;\n    uint256 internal constant UNALLOCATED_ETH = 517;\n    uint256 internal constant ETH_TRANSFER = 518;\n    uint256 internal constant CANNOT_USE_ETH_SENTINEL = 519;\n    uint256 internal constant TOKENS_MISMATCH = 520;\n    uint256 internal constant TOKEN_NOT_REGISTERED = 521;\n    uint256 internal constant TOKEN_ALREADY_REGISTERED = 522;\n    uint256 internal constant TOKENS_ALREADY_SET = 523;\n    uint256 internal constant TOKENS_LENGTH_MUST_BE_2 = 524;\n    uint256 internal constant NONZERO_TOKEN_BALANCE = 525;\n    uint256 internal constant BALANCE_TOTAL_OVERFLOW = 526;\n    uint256 internal constant POOL_NO_TOKENS = 527;\n    uint256 internal constant INSUFFICIENT_FLASH_LOAN_BALANCE = 528;\n\n    // Fees\n    uint256 internal constant SWAP_FEE_PERCENTAGE_TOO_HIGH = 600;\n    uint256 internal constant FLASH_LOAN_FEE_PERCENTAGE_TOO_HIGH = 601;\n    uint256 internal constant INSUFFICIENT_FLASH_LOAN_FEE_AMOUNT = 602;\n}\n"
    },
    "contracts/lib/helpers/IAuthentication.sol": {
      "content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program.  If not, see <http://www.gnu.org/licenses/>.\n\npragma solidity ^0.7.0;\n\ninterface IAuthentication {\n    /**\n     * @dev Returns the action identifier associated with the external function described by `selector`.\n     */\n    function getActionId(bytes4 selector) external view returns (bytes32);\n}\n"
    },
    "contracts/vault/interfaces/IBasePool.sol": {
      "content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program.  If not, see <http://www.gnu.org/licenses/>.\n\npragma solidity ^0.7.0;\npragma experimental ABIEncoderV2;\n\nimport \"./IVault.sol\";\nimport \"./IPoolSwapStructs.sol\";\n\n/**\n * @dev Interface for adding and removing liquidity that all Pool contracts should implement. Note that this is not\n * the complete Pool contract interface, as it is missing the swap hooks. Pool contracts should also inherit from\n * either IGeneralPool or IMinimalSwapInfoPool\n */\ninterface IBasePool is IPoolSwapStructs {\n    /**\n     * @dev Called by the Vault when a user calls `IVault.joinPool` to add liquidity to this Pool. Returns how many of\n     * each registered token the user should provide, as well as the amount of protocol fees the Pool owes to the Vault.\n     * The Vault will then take tokens from `sender` and add them to the Pool's balances, as well as collect\n     * the reported amount in protocol fees, which the pool should calculate based on `protocolSwapFeePercentage`.\n     *\n     * Protocol fees are reported and charged on join events so that the Pool is free of debt whenever new users join.\n     *\n     * `sender` is the account performing the join (from which tokens will be withdrawn), and `recipient` is the account\n     * designated to receive any benefits (typically pool shares). `currentBalances` contains the total balances\n     * for each token the Pool registered in the Vault, in the same order that `IVault.getPoolTokens` would return.\n     *\n     * `lastChangeBlock` is the last block in which *any* of the Pool's registered tokens last changed its total\n     * balance.\n     *\n     * `userData` contains any pool-specific instructions needed to perform the calculations, such as the type of\n     * join (e.g., proportional given an amount of pool shares, single-asset, multi-asset, etc.)\n     *\n     * Contracts implementing this function should check that the caller is indeed the Vault before performing any\n     * state-changing operations, such as minting pool shares.\n     */\n    function onJoinPool(\n        bytes32 poolId,\n        address sender,\n        address recipient,\n        uint256[] memory balances,\n        uint256 lastChangeBlock,\n        uint256 protocolSwapFeePercentage,\n        bytes memory userData\n    ) external returns (uint256[] memory amountsIn, uint256[] memory dueProtocolFeeAmounts);\n\n    /**\n     * @dev Called by the Vault when a user calls `IVault.exitPool` to remove liquidity from this Pool. Returns how many\n     * tokens the Vault should deduct from the Pool's balances, as well as the amount of protocol fees the Pool owes\n     * to the Vault. The Vault will then take tokens from the Pool's balances and send them to `recipient`,\n     * as well as collect the reported amount in protocol fees, which the Pool should calculate based on\n     * `protocolSwapFeePercentage`.\n     *\n     * Protocol fees are charged on exit events to guarantee that users exiting the Pool have paid their share.\n     *\n     * `sender` is the account performing the exit (typically the pool shareholder), and `recipient` is the account\n     * to which the Vault will send the proceeds. `currentBalances` contains the total token balances for each token\n     * the Pool registered in the Vault, in the same order that `IVault.getPoolTokens` would return.\n     *\n     * `lastChangeBlock` is the last block in which *any* of the Pool's registered tokens last changed its total\n     * balance.\n     *\n     * `userData` contains any pool-specific instructions needed to perform the calculations, such as the type of\n     * exit (e.g., proportional given an amount of pool shares, single-asset, multi-asset, etc.)\n     *\n     * Contracts implementing this function should check that the caller is indeed the Vault before performing any\n     * state-changing operations, such as burning pool shares.\n     */\n    function onExitPool(\n        bytes32 poolId,\n        address sender,\n        address recipient,\n        uint256[] memory balances,\n        uint256 lastChangeBlock,\n        uint256 protocolSwapFeePercentage,\n        bytes memory userData\n    ) external returns (uint256[] memory amountsOut, uint256[] memory dueProtocolFeeAmounts);\n}\n"
    },
    "contracts/vault/interfaces/IPoolSwapStructs.sol": {
      "content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program.  If not, see <http://www.gnu.org/licenses/>.\n\npragma solidity ^0.7.0;\npragma experimental ABIEncoderV2;\n\nimport \"../../lib/openzeppelin/IERC20.sol\";\n\nimport \"./IVault.sol\";\n\ninterface IPoolSwapStructs {\n    // This is not really an interface - it just defines common structs used by other interfaces: IGeneralPool and\n    // IMinimalSwapInfoPool.\n    //\n    // This data structure represents a request for a token swap, where `kind` indicates the swap type ('given in' or\n    // 'given out') which indicates whether or not the amount sent by the pool is known.\n    //\n    // The pool receives `tokenIn` and sends `tokenOut`. `amount` is the number of `tokenIn` tokens the pool will take\n    // in, or the number of `tokenOut` tokens the Pool will send out, depending on the given swap `kind`.\n    //\n    // All other fields are not strictly necessary for most swaps, but are provided to support advanced scenarios in\n    // some Pools.\n    //\n    // `poolId` is the ID of the Pool involved in the swap - this is useful for Pool contracts that implement more than\n    // one Pool.\n    //\n    // The meaning of `lastChangeBlock` depends on the Pool specialization:\n    //  - Two Token or Minimal Swap Info: the last block in which either `tokenIn` or `tokenOut` changed its total\n    //    balance.\n    //  - General: the last block in which *any* of the Pool's registered tokens changed its total balance.\n    //\n    // `from` is the origin address for the funds the Pool receives, and `to` is the destination address\n    // where the Pool sends the outgoing tokens.\n    //\n    // `userData` is extra data provided by the caller - typically a signature from a trusted party.\n    struct SwapRequest {\n        IVault.SwapKind kind;\n        IERC20 tokenIn;\n        IERC20 tokenOut;\n        uint256 amount;\n        // Misc data\n        bytes32 poolId;\n        uint256 lastChangeBlock;\n        address from;\n        address to;\n        bytes userData;\n    }\n}\n"
    },
    "contracts/lib/math/FixedPoint.sol": {
      "content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program.  If not, see <http://www.gnu.org/licenses/>.\n\npragma solidity ^0.7.0;\n\nimport \"./LogExpMath.sol\";\nimport \"../helpers/BalancerErrors.sol\";\n\n/* solhint-disable private-vars-leading-underscore */\n\nlibrary FixedPoint {\n    uint256 internal constant ONE = 1e18; // 18 decimal places\n    uint256 internal constant MAX_POW_RELATIVE_ERROR = 10000; // 10^(-14)\n\n    // Minimum base for the power function when the exponent is 'free' (larger than ONE).\n    uint256 internal constant MIN_POW_BASE_FREE_EXPONENT = 0.7e18;\n\n    function add(uint256 a, uint256 b) internal pure returns (uint256) {\n        // Fixed Point addition is the same as regular checked addition\n\n        uint256 c = a + b;\n        _require(c >= a, Errors.ADD_OVERFLOW);\n        return c;\n    }\n\n    function sub(uint256 a, uint256 b) internal pure returns (uint256) {\n        // Fixed Point addition is the same as regular checked addition\n\n        _require(b <= a, Errors.SUB_OVERFLOW);\n        uint256 c = a - b;\n        return c;\n    }\n\n    function mulDown(uint256 a, uint256 b) internal pure returns (uint256) {\n        uint256 product = a * b;\n        _require(a == 0 || product / a == b, Errors.MUL_OVERFLOW);\n\n        return product / ONE;\n    }\n\n    function mulUp(uint256 a, uint256 b) internal pure returns (uint256) {\n        uint256 product = a * b;\n        _require(a == 0 || product / a == b, Errors.MUL_OVERFLOW);\n\n        if (product == 0) {\n            return 0;\n        } else {\n            // The traditional divUp formula is:\n            // divUp(x, y) := (x + y - 1) / y\n            // To avoid intermediate overflow in the addition, we distribute the division and get:\n            // divUp(x, y) := (x - 1) / y + 1\n            // Note that this requires x != 0, which we already tested for.\n\n            return ((product - 1) / ONE) + 1;\n        }\n    }\n\n    function divDown(uint256 a, uint256 b) internal pure returns (uint256) {\n        _require(b != 0, Errors.ZERO_DIVISION);\n\n        if (a == 0) {\n            return 0;\n        } else {\n            uint256 aInflated = a * ONE;\n            _require(aInflated / a == ONE, Errors.DIV_INTERNAL); // mul overflow\n\n            return aInflated / b;\n        }\n    }\n\n    function divUp(uint256 a, uint256 b) internal pure returns (uint256) {\n        _require(b != 0, Errors.ZERO_DIVISION);\n\n        if (a == 0) {\n            return 0;\n        } else {\n            uint256 aInflated = a * ONE;\n            _require(aInflated / a == ONE, Errors.DIV_INTERNAL); // mul overflow\n\n            // The traditional divUp formula is:\n            // divUp(x, y) := (x + y - 1) / y\n            // To avoid intermediate overflow in the addition, we distribute the division and get:\n            // divUp(x, y) := (x - 1) / y + 1\n            // Note that this requires x != 0, which we already tested for.\n\n            return ((aInflated - 1) / b) + 1;\n        }\n    }\n\n    /**\n     * @dev Returns x^y, assuming both are fixed point numbers, rounding down. The result is guaranteed to not be above\n     * the true value (that is, the error function expected - actual is always positive).\n     */\n    function powDown(uint256 x, uint256 y) internal pure returns (uint256) {\n        uint256 raw = LogExpMath.pow(x, y);\n        uint256 maxError = add(mulUp(raw, MAX_POW_RELATIVE_ERROR), 1);\n\n        if (raw < maxError) {\n            return 0;\n        } else {\n            return sub(raw, maxError);\n        }\n    }\n\n    /**\n     * @dev Returns x^y, assuming both are fixed point numbers, rounding up. The result is guaranteed to not be below\n     * the true value (that is, the error function expected - actual is always negative).\n     */\n    function powUp(uint256 x, uint256 y) internal pure returns (uint256) {\n        uint256 raw = LogExpMath.pow(x, y);\n        uint256 maxError = add(mulUp(raw, MAX_POW_RELATIVE_ERROR), 1);\n\n        return add(raw, maxError);\n    }\n\n    /**\n     * @dev Returns the complement of a value (1 - x), capped to 0 if x is larger than 1.\n     *\n     * Useful when computing the complement for values with some level of relative error, as it strips this error and\n     * prevents intermediate negative values.\n     */\n    function complement(uint256 x) internal pure returns (uint256) {\n        return (x < ONE) ? (ONE - x) : 0;\n    }\n}\n"
    },
    "contracts/pools/BaseMinimalSwapInfoPool.sol": {
      "content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program.  If not, see <http://www.gnu.org/licenses/>.\n\npragma solidity ^0.7.0;\npragma experimental ABIEncoderV2;\n\nimport \"./BasePool.sol\";\nimport \"../vault/interfaces/IMinimalSwapInfoPool.sol\";\n\n/**\n * @dev Extension of `BasePool`, adding a handler for `IMinimalSwapInfoPool.onSwap`.\n *\n * Derived contracts must implement `_onSwapGivenIn` and `_onSwapGivenOut` along with `BasePool`'s virtual functions.\n */\nabstract contract BaseMinimalSwapInfoPool is IMinimalSwapInfoPool, BasePool {\n    constructor(\n        IVault vault,\n        string memory name,\n        string memory symbol,\n        IERC20[] memory tokens,\n        uint256 swapFeePercentage,\n        uint256 pauseWindowDuration,\n        uint256 bufferPeriodDuration,\n        address owner\n    )\n        BasePool(\n            vault,\n            tokens.length == 2 ? IVault.PoolSpecialization.TWO_TOKEN : IVault.PoolSpecialization.MINIMAL_SWAP_INFO,\n            name,\n            symbol,\n            tokens,\n            swapFeePercentage,\n            pauseWindowDuration,\n            bufferPeriodDuration,\n            owner\n        )\n    {\n        // solhint-disable-previous-line no-empty-blocks\n    }\n\n    // Swap Hooks\n\n    function onSwap(\n        SwapRequest memory request,\n        uint256 balanceTokenIn,\n        uint256 balanceTokenOut\n    ) external view virtual override returns (uint256) {\n        uint256 scalingFactorTokenIn = _scalingFactor(request.tokenIn);\n        uint256 scalingFactorTokenOut = _scalingFactor(request.tokenOut);\n\n        if (request.kind == IVault.SwapKind.GIVEN_IN) {\n            // Fees are subtracted before scaling, to reduce the complexity of the rounding direction analysis.\n            request.amount = _subtractSwapFeeAmount(request.amount);\n\n            // All token amounts are upscaled.\n            balanceTokenIn = _upscale(balanceTokenIn, scalingFactorTokenIn);\n            balanceTokenOut = _upscale(balanceTokenOut, scalingFactorTokenOut);\n            request.amount = _upscale(request.amount, scalingFactorTokenIn);\n\n            uint256 amountOut = _onSwapGivenIn(request, balanceTokenIn, balanceTokenOut);\n\n            // amountOut tokens are exiting the Pool, so we round down.\n            return _downscaleDown(amountOut, scalingFactorTokenOut);\n        } else {\n            // All token amounts are upscaled.\n            balanceTokenIn = _upscale(balanceTokenIn, scalingFactorTokenIn);\n            balanceTokenOut = _upscale(balanceTokenOut, scalingFactorTokenOut);\n            request.amount = _upscale(request.amount, scalingFactorTokenOut);\n\n            uint256 amountIn = _onSwapGivenOut(request, balanceTokenIn, balanceTokenOut);\n\n            // amountIn tokens are entering the Pool, so we round up.\n            amountIn = _downscaleUp(amountIn, scalingFactorTokenIn);\n\n            // Fees are added after scaling happens, to reduce the complexity of the rounding direction analysis.\n            return _addSwapFeeAmount(amountIn);\n        }\n    }\n\n    /*\n     * @dev Called when a swap with the Pool occurs, where the amount of tokens entering the Pool is known.\n     *\n     * Returns the amount of tokens that will be taken from the Pool in return.\n     *\n     * All amounts inside `swapRequest`, `balanceTokenIn` and `balanceTokenOut` are upscaled. The swap fee has already\n     * been deducted from `swapRequest.amount`.\n     *\n     * The return value is also considered upscaled, and will be downscaled (rounding down) before returning it to the\n     * Vault.\n     */\n    function _onSwapGivenIn(\n        SwapRequest memory swapRequest,\n        uint256 balanceTokenIn,\n        uint256 balanceTokenOut\n    ) internal view virtual returns (uint256);\n\n    /*\n     * @dev Called when a swap with the Pool occurs, where the amount of tokens exiting the Pool is known.\n     *\n     * Returns the amount of tokens that will be granted to the Pool in return.\n     *\n     * All amounts inside `swapRequest`, `balanceTokenIn` and `balanceTokenOut` are upscaled.\n     *\n     * The return value is also considered upscaled, and will be downscaled (rounding up) before applying the swap fee\n     * and returning it to the Vault.\n     */\n    function _onSwapGivenOut(\n        SwapRequest memory swapRequest,\n        uint256 balanceTokenIn,\n        uint256 balanceTokenOut\n    ) internal view virtual returns (uint256);\n}\n"
    },
    "contracts/pools/weighted/WeightedMath.sol": {
      "content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program.  If not, see <http://www.gnu.org/licenses/>.\n\npragma solidity ^0.7.0;\n\nimport \"../../lib/math/FixedPoint.sol\";\nimport \"../../lib/math/Math.sol\";\nimport \"../../lib/helpers/InputHelpers.sol\";\n\n/* solhint-disable private-vars-leading-underscore */\n\ncontract WeightedMath {\n    using FixedPoint for uint256;\n    // A minimum normalized weight imposes a maximum weight ratio. We need this due to limitations in the\n    // implementation of the power function, as these ratios are often exponents.\n    uint256 internal constant _MIN_WEIGHT = 0.01e18;\n    // Having a minimum normalized weight imposes a limit on the maximum number of tokens;\n    // i.e., the largest possible pool is one where all tokens have exactly the minimum weight.\n    uint256 internal constant _MAX_WEIGHTED_TOKENS = 100;\n\n    // Pool limits that arise from limitations in the fixed point power function (and the imposed 1:100 maximum weight\n    // ratio).\n\n    // Swap limits: amounts swapped may not be larger than this percentage of total balance.\n    uint256 internal constant _MAX_IN_RATIO = 0.3e18;\n    uint256 internal constant _MAX_OUT_RATIO = 0.3e18;\n\n    // Invariant growth limit: non-proportional joins cannot cause the invariant to increase by more than this ratio.\n    uint256 internal constant _MAX_INVARIANT_RATIO = 3e18;\n    // Invariant shrink limit: non-proportional exits cannot cause the invariant to decrease by less than this ratio.\n    uint256 internal constant _MIN_INVARIANT_RATIO = 0.7e18;\n\n    // Invariant is used to collect protocol swap fees by comparing its value between two times.\n    // So we can round always to the same direction. It is also used to initiate the BPT amount\n    // and, because there is a minimum BPT, we round down the invariant.\n    function _calculateInvariant(uint256[] memory normalizedWeights, uint256[] memory balances)\n        internal\n        pure\n        returns (uint256 invariant)\n    {\n        /**********************************************************************************************\n        // invariant               _____                                                             //\n        // wi = weight index i      | |      wi                                                      //\n        // bi = balance index i     | |  bi ^   = i                                                  //\n        // i = invariant                                                                             //\n        **********************************************************************************************/\n\n        invariant = FixedPoint.ONE;\n        for (uint256 i = 0; i < normalizedWeights.length; i++) {\n            invariant = invariant.mulDown(balances[i].powDown(normalizedWeights[i]));\n        }\n\n        _require(invariant > 0, Errors.ZERO_INVARIANT);\n    }\n\n    // Computes how many tokens can be taken out of a pool if `amountIn` are sent, given the\n    // current balances and weights.\n    function _calcOutGivenIn(\n        uint256 balanceIn,\n        uint256 weightIn,\n        uint256 balanceOut,\n        uint256 weightOut,\n        uint256 amountIn\n    ) internal pure returns (uint256) {\n        /**********************************************************************************************\n        // outGivenIn                                                                                //\n        // aO = amountOut                                                                            //\n        // bO = balanceOut                                                                           //\n        // bI = balanceIn              /      /            bI             \\    (wI / wO) \\           //\n        // aI = amountIn    aO = bO * |  1 - | --------------------------  | ^            |          //\n        // wI = weightIn               \\      \\       ( bI + aI )         /              /           //\n        // wO = weightOut                                                                            //\n        **********************************************************************************************/\n\n        // Amount out, so we round down overall.\n\n        // The multiplication rounds down, and the subtrahend (power) rounds up (so the base rounds up too).\n        // Because bI / (bI + aI) <= 1, the exponent rounds down.\n\n        // Cannot exceed maximum in ratio\n        _require(amountIn <= balanceIn.mulDown(_MAX_IN_RATIO), Errors.MAX_IN_RATIO);\n\n        uint256 denominator = balanceIn.add(amountIn);\n        uint256 base = balanceIn.divUp(denominator);\n        uint256 exponent = weightIn.divDown(weightOut);\n        uint256 power = base.powUp(exponent);\n\n        return balanceOut.mulDown(power.complement());\n    }\n\n    // Computes how many tokens must be sent to a pool in order to take `amountOut`, given the\n    // current balances and weights.\n    function _calcInGivenOut(\n        uint256 balanceIn,\n        uint256 weightIn,\n        uint256 balanceOut,\n        uint256 weightOut,\n        uint256 amountOut\n    ) internal pure returns (uint256) {\n        /**********************************************************************************************\n        // inGivenOut                                                                                //\n        // aO = amountOut                                                                            //\n        // bO = balanceOut                                                                           //\n        // bI = balanceIn              /  /            bO             \\    (wO / wI)      \\          //\n        // aI = amountIn    aI = bI * |  | --------------------------  | ^            - 1  |         //\n        // wI = weightIn               \\  \\       ( bO - aO )         /                   /          //\n        // wO = weightOut                                                                            //\n        **********************************************************************************************/\n\n        // Amount in, so we round up overall.\n\n        // The multiplication rounds up, and the power rounds up (so the base rounds up too).\n        // Because b0 / (b0 - a0) >= 1, the exponent rounds up.\n\n        // Cannot exceed maximum out ratio\n        _require(amountOut <= balanceOut.mulDown(_MAX_OUT_RATIO), Errors.MAX_OUT_RATIO);\n\n        uint256 base = balanceOut.divUp(balanceOut.sub(amountOut));\n        uint256 exponent = weightOut.divUp(weightIn);\n        uint256 power = base.powUp(exponent);\n\n        // Because the base is larger than one (and the power rounds up), the power should always be larger than one, so\n        // the following subtraction should never revert.\n        uint256 ratio = power.sub(FixedPoint.ONE);\n\n        return balanceIn.mulUp(ratio);\n    }\n\n    function _calcBptOutGivenExactTokensIn(\n        uint256[] memory balances,\n        uint256[] memory normalizedWeights,\n        uint256[] memory amountsIn,\n        uint256 bptTotalSupply,\n        uint256 swapFee\n    ) internal pure returns (uint256) {\n        // BPT out, so we round down overall.\n\n        uint256[] memory balanceRatiosWithFee = new uint256[](amountsIn.length);\n\n        uint256 invariantRatioWithFees = 0;\n        for (uint256 i = 0; i < balances.length; i++) {\n            balanceRatiosWithFee[i] = balances[i].add(amountsIn[i]).divDown(balances[i]);\n            invariantRatioWithFees = invariantRatioWithFees.add(balanceRatiosWithFee[i].mulDown(normalizedWeights[i]));\n        }\n\n        uint256 invariantRatio = FixedPoint.ONE;\n        for (uint256 i = 0; i < balances.length; i++) {\n            uint256 amountInWithoutFee;\n\n            if (balanceRatiosWithFee[i] > invariantRatioWithFees) {\n                uint256 nonTaxableAmount = balances[i].mulDown(invariantRatioWithFees.sub(FixedPoint.ONE));\n                uint256 taxableAmount = amountsIn[i].sub(nonTaxableAmount);\n                amountInWithoutFee = nonTaxableAmount.add(taxableAmount.mulDown(FixedPoint.ONE.sub(swapFee)));\n            } else {\n                amountInWithoutFee = amountsIn[i];\n            }\n\n            uint256 balanceRatio = balances[i].add(amountInWithoutFee).divDown(balances[i]);\n\n            invariantRatio = invariantRatio.mulDown(balanceRatio.powDown(normalizedWeights[i]));\n        }\n\n        if (invariantRatio >= FixedPoint.ONE) {\n            return bptTotalSupply.mulDown(invariantRatio.sub(FixedPoint.ONE));\n        } else {\n            return 0;\n        }\n    }\n\n    function _calcTokenInGivenExactBptOut(\n        uint256 balance,\n        uint256 normalizedWeight,\n        uint256 bptAmountOut,\n        uint256 bptTotalSupply,\n        uint256 swapFee\n    ) internal pure returns (uint256) {\n        /******************************************************************************************\n        // tokenInForExactBPTOut                                                                 //\n        // a = amountIn                                                                          //\n        // b = balance                      /  /    totalBPT + bptOut      \\    (1 / w)       \\  //\n        // bptOut = bptAmountOut   a = b * |  | --------------------------  | ^          - 1  |  //\n        // bpt = totalBPT                   \\  \\       totalBPT            /                  /  //\n        // w = weight                                                                            //\n        ******************************************************************************************/\n\n        // Token in, so we round up overall.\n\n        // Calculate the factor by which the invariant will increase after minting BPTAmountOut\n        uint256 invariantRatio = bptTotalSupply.add(bptAmountOut).divUp(bptTotalSupply);\n        _require(invariantRatio <= _MAX_INVARIANT_RATIO, Errors.MAX_OUT_BPT_FOR_TOKEN_IN);\n\n        // Calculate by how much the token balance has to increase to match the invariantRatio\n        uint256 balanceRatio = invariantRatio.powUp(FixedPoint.ONE.divUp(normalizedWeight));\n\n        uint256 amountInWithoutFee = balance.mulUp(balanceRatio.sub(FixedPoint.ONE));\n\n        // We can now compute how much extra balance is being deposited and used in virtual swaps, and charge swap fees\n        // accordingly.\n        uint256 taxablePercentage = normalizedWeight.complement();\n        uint256 taxableAmount = amountInWithoutFee.mulUp(taxablePercentage);\n        uint256 nonTaxableAmount = amountInWithoutFee.sub(taxableAmount);\n\n        return nonTaxableAmount.add(taxableAmount.divUp(swapFee.complement()));\n    }\n\n    function _calcBptInGivenExactTokensOut(\n        uint256[] memory balances,\n        uint256[] memory normalizedWeights,\n        uint256[] memory amountsOut,\n        uint256 bptTotalSupply,\n        uint256 swapFee\n    ) internal pure returns (uint256) {\n        // BPT in, so we round up overall.\n\n        uint256[] memory balanceRatiosWithoutFee = new uint256[](amountsOut.length);\n        uint256 invariantRatioWithoutFees = 0;\n        for (uint256 i = 0; i < balances.length; i++) {\n            balanceRatiosWithoutFee[i] = balances[i].sub(amountsOut[i]).divUp(balances[i]);\n            invariantRatioWithoutFees = invariantRatioWithoutFees.add(\n                balanceRatiosWithoutFee[i].mulUp(normalizedWeights[i])\n            );\n        }\n\n        uint256 invariantRatio = FixedPoint.ONE;\n        for (uint256 i = 0; i < balances.length; i++) {\n            // Swap fees are typically charged on 'token in', but there is no 'token in' here,\n            // o we apply it to 'token out'.\n            // This results in slightly larger price impact.\n\n            uint256 amountOutWithFee;\n            if (invariantRatioWithoutFees > balanceRatiosWithoutFee[i]) {\n                uint256 nonTaxableAmount = balances[i].mulDown(invariantRatioWithoutFees.complement());\n                uint256 taxableAmount = amountsOut[i].sub(nonTaxableAmount);\n\n                amountOutWithFee = nonTaxableAmount.add(taxableAmount.divUp(swapFee.complement()));\n            } else {\n                amountOutWithFee = amountsOut[i];\n            }\n\n            uint256 balanceRatio = balances[i].sub(amountOutWithFee).divDown(balances[i]);\n\n            invariantRatio = invariantRatio.mulDown(balanceRatio.powDown(normalizedWeights[i]));\n        }\n\n        return bptTotalSupply.mulUp(invariantRatio.complement());\n    }\n\n    function _calcTokenOutGivenExactBptIn(\n        uint256 balance,\n        uint256 normalizedWeight,\n        uint256 bptAmountIn,\n        uint256 bptTotalSupply,\n        uint256 swapFee\n    ) internal pure returns (uint256) {\n        /*****************************************************************************************\n        // exactBPTInForTokenOut                                                                //\n        // a = amountOut                                                                        //\n        // b = balance                     /      /    totalBPT - bptIn       \\    (1 / w)  \\   //\n        // bptIn = bptAmountIn    a = b * |  1 - | --------------------------  | ^           |  //\n        // bpt = totalBPT                  \\      \\       totalBPT            /             /   //\n        // w = weight                                                                           //\n        *****************************************************************************************/\n\n        // Token out, so we round down overall. The multiplication rounds down, but the power rounds up (so the base\n        // rounds up). Because (totalBPT - bptIn) / totalBPT <= 1, the exponent rounds down.\n\n        // Calculate the factor by which the invariant will decrease after burning BPTAmountIn\n        uint256 invariantRatio = bptTotalSupply.sub(bptAmountIn).divUp(bptTotalSupply);\n        _require(invariantRatio >= _MIN_INVARIANT_RATIO, Errors.MIN_BPT_IN_FOR_TOKEN_OUT);\n\n        // Calculate by how much the token balance has to decrease to match invariantRatio\n        uint256 balanceRatio = invariantRatio.powUp(FixedPoint.ONE.divDown(normalizedWeight));\n\n        // Because of rounding up, balanceRatio can be greater than one. Using complement prevents reverts.\n        uint256 amountOutWithoutFee = balance.mulDown(balanceRatio.complement());\n\n        // We can now compute how much excess balance is being withdrawn as a result of the virtual swaps, which result\n        // in swap fees.\n        uint256 taxablePercentage = normalizedWeight.complement();\n\n        // Swap fees are typically charged on 'token in', but there is no 'token in' here, so we apply it\n        // to 'token out'. This results in slightly larger price impact. Fees are rounded up.\n        uint256 taxableAmount = amountOutWithoutFee.mulUp(taxablePercentage);\n        uint256 nonTaxableAmount = amountOutWithoutFee.sub(taxableAmount);\n\n        return nonTaxableAmount.add(taxableAmount.mulDown(swapFee.complement()));\n    }\n\n    function _calcTokensOutGivenExactBptIn(\n        uint256[] memory balances,\n        uint256 bptAmountIn,\n        uint256 totalBPT\n    ) internal pure returns (uint256[] memory) {\n        /**********************************************************************************************\n        // exactBPTInForTokensOut                                                                    //\n        // (per token)                                                                               //\n        // aO = amountOut                  /        bptIn         \\                                  //\n        // b = balance           a0 = b * | ---------------------  |                                 //\n        // bptIn = bptAmountIn             \\       totalBPT       /                                  //\n        // bpt = totalBPT                                                                            //\n        **********************************************************************************************/\n\n        // Since we're computing an amount out, we round down overall. This means rounding down on both the\n        // multiplication and division.\n\n        uint256 bptRatio = bptAmountIn.divDown(totalBPT);\n\n        uint256[] memory amountsOut = new uint256[](balances.length);\n        for (uint256 i = 0; i < balances.length; i++) {\n            amountsOut[i] = balances[i].mulDown(bptRatio);\n        }\n\n        return amountsOut;\n    }\n\n    function _calcDueTokenProtocolSwapFeeAmount(\n        uint256 balance,\n        uint256 normalizedWeight,\n        uint256 previousInvariant,\n        uint256 currentInvariant,\n        uint256 protocolSwapFeePercentage\n    ) internal pure returns (uint256) {\n        /*********************************************************************************\n        /*  protocolSwapFeePercentage * balanceToken * ( 1 - (previousInvariant / currentInvariant) ^ (1 / weightToken))\n        *********************************************************************************/\n\n        if (currentInvariant <= previousInvariant) {\n            // This shouldn't happen outside of rounding errors, but have this safeguard nonetheless to prevent the Pool\n            // from entering a locked state in which joins and exits revert while computing accumulated swap fees.\n            return 0;\n        }\n\n        // We round down to prevent issues in the Pool's accounting, even if it means paying slightly less in protocol\n        // fees to the Vault.\n\n        // Fee percentage and balance multiplications round down, while the subtrahend (power) rounds up (as does the\n        // base). Because previousInvariant / currentInvariant <= 1, the exponent rounds down.\n\n        uint256 base = previousInvariant.divUp(currentInvariant);\n        uint256 exponent = FixedPoint.ONE.divDown(normalizedWeight);\n\n        // Because the exponent is larger than one, the base of the power function has a lower bound. We cap to this\n        // value to avoid numeric issues, which means in the extreme case (where the invariant growth is larger than\n        // 1 / min exponent) the Pool will pay less in protocol fees than it should.\n        base = Math.max(base, FixedPoint.MIN_POW_BASE_FREE_EXPONENT);\n\n        uint256 power = base.powUp(exponent);\n\n        uint256 tokenAccruedFees = balance.mulDown(power.complement());\n        return tokenAccruedFees.mulDown(protocolSwapFeePercentage);\n    }\n}\n"
    },
    "contracts/pools/weighted/WeightedPoolUserDataHelpers.sol": {
      "content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program.  If not, see <http://www.gnu.org/licenses/>.\n\npragma solidity ^0.7.0;\n\nimport \"../../lib/openzeppelin/IERC20.sol\";\n\nimport \"./WeightedPool.sol\";\n\nlibrary WeightedPoolUserDataHelpers {\n    function joinKind(bytes memory self) internal pure returns (WeightedPool.JoinKind) {\n        return abi.decode(self, (WeightedPool.JoinKind));\n    }\n\n    function exitKind(bytes memory self) internal pure returns (WeightedPool.ExitKind) {\n        return abi.decode(self, (WeightedPool.ExitKind));\n    }\n\n    // Joins\n\n    function initialAmountsIn(bytes memory self) internal pure returns (uint256[] memory amountsIn) {\n        (, amountsIn) = abi.decode(self, (WeightedPool.JoinKind, uint256[]));\n    }\n\n    function exactTokensInForBptOut(bytes memory self)\n        internal\n        pure\n        returns (uint256[] memory amountsIn, uint256 minBPTAmountOut)\n    {\n        (, amountsIn, minBPTAmountOut) = abi.decode(self, (WeightedPool.JoinKind, uint256[], uint256));\n    }\n\n    function tokenInForExactBptOut(bytes memory self) internal pure returns (uint256 bptAmountOut, uint256 tokenIndex) {\n        (, bptAmountOut, tokenIndex) = abi.decode(self, (WeightedPool.JoinKind, uint256, uint256));\n    }\n\n    // Exits\n\n    function exactBptInForTokenOut(bytes memory self) internal pure returns (uint256 bptAmountIn, uint256 tokenIndex) {\n        (, bptAmountIn, tokenIndex) = abi.decode(self, (WeightedPool.ExitKind, uint256, uint256));\n    }\n\n    function exactBptInForTokensOut(bytes memory self) internal pure returns (uint256 bptAmountIn) {\n        (, bptAmountIn) = abi.decode(self, (WeightedPool.ExitKind, uint256));\n    }\n\n    function bptInForExactTokensOut(bytes memory self)\n        internal\n        pure\n        returns (uint256[] memory amountsOut, uint256 maxBPTAmountIn)\n    {\n        (, amountsOut, maxBPTAmountIn) = abi.decode(self, (WeightedPool.ExitKind, uint256[], uint256));\n    }\n}\n"
    },
    "contracts/lib/math/LogExpMath.sol": {
      "content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n// GNU General internal License for more details.\n\n// You should have received a copy of the GNU General internal License\n// along with this program.  If not, see <http://www.gnu.org/licenses/>.\n\npragma solidity ^0.7.0;\n\nimport \"../helpers/BalancerErrors.sol\";\n\n/* solhint-disable */\n\n/**\n * @dev Exponentiation and logarithm functions for 18 decimal fixed point numbers (both base and exponent/argument).\n *\n * Exponentiation and logarithm with arbitrary bases (x^y and log_x(y)) are implemented by conversion to natural\n * exponentiation and logarithm (where the base is Euler's number).\n *\n * @author Fernando Martinelli - @fernandomartinelli\n * @author Sergio Yuhjtman - @sergioyuhjtman\n * @author Daniel Fernandez - @dmf7z\n */\nlibrary LogExpMath {\n    // All fixed point multiplications and divisions are inlined. This means we need to divide by ONE when multiplying\n    // two numbers, and multiply by ONE when dividing them.\n\n    // All arguments and return values are 18 decimal fixed point numbers.\n    int256 constant ONE_18 = 1e18;\n\n    // Internally, intermediate values are computed with higher precision as 20 decimal fixed point numbers, and in the\n    // case of ln36, 36 decimals.\n    int256 constant ONE_20 = 1e20;\n    int256 constant ONE_36 = 1e36;\n\n    // The domain of natural exponentiation is bound by the word size and number of decimals used.\n    //\n    // Because internally the result will be stored using 20 decimals, the largest possible result is\n    // (2^255 - 1) / 10^20, which makes the largest exponent ln((2^255 - 1) / 10^20) = 130.700829182905140221.\n    // The smallest possible result is 10^(-18), which makes largest negative argument\n    // ln(10^(-18)) = -41.446531673892822312.\n    // We use 130.0 and -41.0 to have some safety margin.\n    int256 constant MAX_NATURAL_EXPONENT = 130e18;\n    int256 constant MIN_NATURAL_EXPONENT = -41e18;\n\n    // Bounds for ln_36's argument. Both ln(0.9) and ln(1.1) can be represented with 36 decimal places in a fixed point\n    // 256 bit integer.\n    int256 constant LN_36_LOWER_BOUND = ONE_18 - 1e17;\n    int256 constant LN_36_UPPER_BOUND = ONE_18 + 1e17;\n\n    uint256 constant MILD_EXPONENT_BOUND = 2**254 / uint256(ONE_20);\n\n    // 18 decimal constants\n    int256 constant x0 = 128000000000000000000; // 2ˆ7\n    int256 constant a0 = 38877084059945950922200000000000000000000000000000000000; // eˆ(x0) (no decimals)\n    int256 constant x1 = 64000000000000000000; // 2ˆ6\n    int256 constant a1 = 6235149080811616882910000000; // eˆ(x1) (no decimals)\n\n    // 20 decimal constants\n    int256 constant x2 = 3200000000000000000000; // 2ˆ5\n    int256 constant a2 = 7896296018268069516100000000000000; // eˆ(x2)\n    int256 constant x3 = 1600000000000000000000; // 2ˆ4\n    int256 constant a3 = 888611052050787263676000000; // eˆ(x3)\n    int256 constant x4 = 800000000000000000000; // 2ˆ3\n    int256 constant a4 = 298095798704172827474000; // eˆ(x4)\n    int256 constant x5 = 400000000000000000000; // 2ˆ2\n    int256 constant a5 = 5459815003314423907810; // eˆ(x5)\n    int256 constant x6 = 200000000000000000000; // 2ˆ1\n    int256 constant a6 = 738905609893065022723; // eˆ(x6)\n    int256 constant x7 = 100000000000000000000; // 2ˆ0\n    int256 constant a7 = 271828182845904523536; // eˆ(x7)\n    int256 constant x8 = 50000000000000000000; // 2ˆ-1\n    int256 constant a8 = 164872127070012814685; // eˆ(x8)\n    int256 constant x9 = 25000000000000000000; // 2ˆ-2\n    int256 constant a9 = 128402541668774148407; // eˆ(x9)\n    int256 constant x10 = 12500000000000000000; // 2ˆ-3\n    int256 constant a10 = 113314845306682631683; // eˆ(x10)\n    int256 constant x11 = 6250000000000000000; // 2ˆ-4\n    int256 constant a11 = 106449445891785942956; // eˆ(x11)\n\n    /**\n     * @dev Exponentiation (x^y) with unsigned 18 decimal fixed point base and exponent.\n     *\n     * Reverts if ln(x) * y is smaller than `MIN_NATURAL_EXPONENT`, or larger than `MAX_NATURAL_EXPONENT`.\n     */\n    function pow(uint256 x, uint256 y) internal pure returns (uint256) {\n        if (y == 0) {\n            // We solve the 0^0 indetermination by making it equal one.\n            return uint256(ONE_18);\n        }\n\n        if (x == 0) {\n            return 0;\n        }\n\n        // Instead of computing x^y directly, we instead rely on the properties of logarithms and exponentiation to\n        // arrive at that result. In particular, exp(ln(x)) = x, and ln(x^y) = y * ln(x). This means\n        // x^y = exp(y * ln(x)).\n\n        // The ln function takes a signed value, so we need to make sure x fits in the signed 256 bit range.\n        _require(x < 2**255, Errors.X_OUT_OF_BOUNDS);\n        int256 x_int256 = int256(x);\n\n        // We will compute y * ln(x) in a single step. Depending on the value of x, we can either use ln or ln_36. In\n        // both cases, we leave the division by ONE_18 (due to fixed point multiplication) to the end.\n\n        // This prevents y * ln(x) from overflowing, and at the same time guarantees y fits in the signed 256 bit range.\n        _require(y < MILD_EXPONENT_BOUND, Errors.Y_OUT_OF_BOUNDS);\n        int256 y_int256 = int256(y);\n\n        int256 logx_times_y;\n        if (LN_36_LOWER_BOUND < x_int256 && x_int256 < LN_36_UPPER_BOUND) {\n            int256 ln_36_x = ln_36(x_int256);\n\n            // ln_36_x has 36 decimal places, so multiplying by y_int256 isn't as straightforward, since we can't just\n            // bring y_int256 to 36 decimal places, as it might overflow. Instead, we perform two 18 decimal\n            // multiplications and add the results: one with the first 18 decimals of ln_36_x, and one with the\n            // (downscaled) last 18 decimals.\n            logx_times_y = ((ln_36_x / ONE_18) * y_int256 + ((ln_36_x % ONE_18) * y_int256) / ONE_18);\n        } else {\n            logx_times_y = ln(x_int256) * y_int256;\n        }\n        logx_times_y /= ONE_18;\n\n        // Finally, we compute exp(y * ln(x)) to arrive at x^y\n        _require(\n            MIN_NATURAL_EXPONENT <= logx_times_y && logx_times_y <= MAX_NATURAL_EXPONENT,\n            Errors.PRODUCT_OUT_OF_BOUNDS\n        );\n\n        return uint256(exp(logx_times_y));\n    }\n\n    /**\n     * @dev Natural exponentiation (e^x) with signed 18 decimal fixed point exponent.\n     *\n     * Reverts if `x` is smaller than MIN_NATURAL_EXPONENT, or larger than `MAX_NATURAL_EXPONENT`.\n     */\n    function exp(int256 x) internal pure returns (int256) {\n        _require(x >= MIN_NATURAL_EXPONENT && x <= MAX_NATURAL_EXPONENT, Errors.INVALID_EXPONENT);\n\n        if (x < 0) {\n            // We only handle positive exponents: e^(-x) is computed as 1 / e^x. We can safely make x positive since it\n            // fits in the signed 256 bit range (as it is larger than MIN_NATURAL_EXPONENT).\n            // Fixed point division requires multiplying by ONE_18.\n            return ((ONE_18 * ONE_18) / exp(-x));\n        }\n\n        // First, we use the fact that e^(x+y) = e^x * e^y to decompose x into a sum of powers of two, which we call x_n,\n        // where x_n == 2^(7 - n), and e^x_n = a_n has been precomputed. We choose the first x_n, x0, to equal 2^7\n        // because all larger powers are larger than MAX_NATURAL_EXPONENT, and therefore not present in the\n        // decomposition.\n        // At the end of this process we will have the product of all e^x_n = a_n that apply, and the remainder of this\n        // decomposition, which will be lower than the smallest x_n.\n        // exp(x) = k_0 * a_0 * k_1 * a_1 * ... + k_n * a_n * exp(remainder), where each k_n equals either 0 or 1.\n        // We mutate x by subtracting x_n, making it the remainder of the decomposition.\n\n        // The first two a_n (e^(2^7) and e^(2^6)) are too large if stored as 18 decimal numbers, and could cause\n        // intermediate overflows. Instead we store them as plain integers, with 0 decimals.\n        // Additionally, x0 + x1 is larger than MAX_NATURAL_EXPONENT, which means they will not both be present in the\n        // decomposition.\n\n        // For each x_n, we test if that term is present in the decomposition (if x is larger than it), and if so deduct\n        // it and compute the accumulated product.\n\n        int256 firstAN;\n        if (x >= x0) {\n            x -= x0;\n            firstAN = a0;\n        } else if (x >= x1) {\n            x -= x1;\n            firstAN = a1;\n        } else {\n            firstAN = 1; // One with no decimal places\n        }\n\n        // We now transform x into a 20 decimal fixed point number, to have enhanced precision when computing the\n        // smaller terms.\n        x *= 100;\n\n        // `product` is the accumulated product of all a_n (except a0 and a1), which starts at 20 decimal fixed point\n        // one. Recall that fixed point multiplication requires dividing by ONE_20.\n        int256 product = ONE_20;\n\n        if (x >= x2) {\n            x -= x2;\n            product = (product * a2) / ONE_20;\n        }\n        if (x >= x3) {\n            x -= x3;\n            product = (product * a3) / ONE_20;\n        }\n        if (x >= x4) {\n            x -= x4;\n            product = (product * a4) / ONE_20;\n        }\n        if (x >= x5) {\n            x -= x5;\n            product = (product * a5) / ONE_20;\n        }\n        if (x >= x6) {\n            x -= x6;\n            product = (product * a6) / ONE_20;\n        }\n        if (x >= x7) {\n            x -= x7;\n            product = (product * a7) / ONE_20;\n        }\n        if (x >= x8) {\n            x -= x8;\n            product = (product * a8) / ONE_20;\n        }\n        if (x >= x9) {\n            x -= x9;\n            product = (product * a9) / ONE_20;\n        }\n\n        // x10 and x11 are unnecessary here since we have high enough precision already.\n\n        // Now we need to compute e^x, where x is small (in particular, it is smaller than x9). We use the Taylor series\n        // expansion for e^x: 1 + x + (x^2 / 2!) + (x^3 / 3!) + ... + (x^n / n!).\n\n        int256 seriesSum = ONE_20; // The initial one in the sum, with 20 decimal places.\n        int256 term; // Each term in the sum, where the nth term is (x^n / n!).\n\n        // The first term is simply x.\n        term = x;\n        seriesSum += term;\n\n        // Each term (x^n / n!) equals the previous one times x, divided by n. Since x is a fixed point number,\n        // multiplying by it requires dividing by ONE_20, but dividing by the non-fixed point n values does not.\n\n        term = ((term * x) / ONE_20) / 2;\n        seriesSum += term;\n\n        term = ((term * x) / ONE_20) / 3;\n        seriesSum += term;\n\n        term = ((term * x) / ONE_20) / 4;\n        seriesSum += term;\n\n        term = ((term * x) / ONE_20) / 5;\n        seriesSum += term;\n\n        term = ((term * x) / ONE_20) / 6;\n        seriesSum += term;\n\n        term = ((term * x) / ONE_20) / 7;\n        seriesSum += term;\n\n        term = ((term * x) / ONE_20) / 8;\n        seriesSum += term;\n\n        term = ((term * x) / ONE_20) / 9;\n        seriesSum += term;\n\n        term = ((term * x) / ONE_20) / 10;\n        seriesSum += term;\n\n        term = ((term * x) / ONE_20) / 11;\n        seriesSum += term;\n\n        term = ((term * x) / ONE_20) / 12;\n        seriesSum += term;\n\n        // 12 Taylor terms are sufficient for 18 decimal precision.\n\n        // We now have the first a_n (with no decimals), and the product of all other a_n present, and the Taylor\n        // approximation of the exponentiation of the remainder (both with 20 decimals). All that remains is to multiply\n        // all three (one 20 decimal fixed point multiplication, dividing by ONE_20, and one integer multiplication),\n        // and then drop two digits to return an 18 decimal value.\n\n        return (((product * seriesSum) / ONE_20) * firstAN) / 100;\n    }\n\n    /**\n     * @dev Natural logarithm (ln(a)) with signed 18 decimal fixed point argument.\n     */\n    function ln(int256 a) internal pure returns (int256) {\n        // The real natural logarithm is not defined for negative numbers or zero.\n        _require(a > 0, Errors.OUT_OF_BOUNDS);\n\n        if (a < ONE_18) {\n            // Since ln(a^k) = k * ln(a), we can compute ln(a) as ln(a) = ln((1/a)^(-1)) = - ln((1/a)). If a is less\n            // than one, 1/a will be greater than one, and this if statement will not be entered in the recursive call.\n            // Fixed point division requires multiplying by ONE_18.\n            return (-ln((ONE_18 * ONE_18) / a));\n        }\n\n        // First, we use the fact that ln^(a * b) = ln(a) + ln(b) to decompose ln(a) into a sum of powers of two, which\n        // we call x_n, where x_n == 2^(7 - n), which are the natural logarithm of precomputed quantities a_n (that is,\n        // ln(a_n) = x_n). We choose the first x_n, x0, to equal 2^7 because the exponential of all larger powers cannot\n        // be represented as 18 fixed point decimal numbers in 256 bits, and are therefore larger than a.\n        // At the end of this process we will have the sum of all x_n = ln(a_n) that apply, and the remainder of this\n        // decomposition, which will be lower than the smallest a_n.\n        // ln(a) = k_0 * x_0 + k_1 * x_1 + ... + k_n * x_n + ln(remainder), where each k_n equals either 0 or 1.\n        // We mutate a by subtracting a_n, making it the remainder of the decomposition.\n\n        // For reasons related to how `exp` works, the first two a_n (e^(2^7) and e^(2^6)) are not stored as fixed point\n        // numbers with 18 decimals, but instead as plain integers with 0 decimals, so we need to multiply them by\n        // ONE_18 to convert them to fixed point.\n        // For each a_n, we test if that term is present in the decomposition (if a is larger than it), and if so divide\n        // by it and compute the accumulated sum.\n\n        int256 sum = 0;\n        if (a >= a0 * ONE_18) {\n            a /= a0; // Integer, not fixed point division\n            sum += x0;\n        }\n\n        if (a >= a1 * ONE_18) {\n            a /= a1; // Integer, not fixed point division\n            sum += x1;\n        }\n\n        // All other a_n and x_n are stored as 20 digit fixed point numbers, so we convert the sum and a to this format.\n        sum *= 100;\n        a *= 100;\n\n        // Because further a_n are  20 digit fixed point numbers, we multiply by ONE_20 when dividing by them.\n\n        if (a >= a2) {\n            a = (a * ONE_20) / a2;\n            sum += x2;\n        }\n\n        if (a >= a3) {\n            a = (a * ONE_20) / a3;\n            sum += x3;\n        }\n\n        if (a >= a4) {\n            a = (a * ONE_20) / a4;\n            sum += x4;\n        }\n\n        if (a >= a5) {\n            a = (a * ONE_20) / a5;\n            sum += x5;\n        }\n\n        if (a >= a6) {\n            a = (a * ONE_20) / a6;\n            sum += x6;\n        }\n\n        if (a >= a7) {\n            a = (a * ONE_20) / a7;\n            sum += x7;\n        }\n\n        if (a >= a8) {\n            a = (a * ONE_20) / a8;\n            sum += x8;\n        }\n\n        if (a >= a9) {\n            a = (a * ONE_20) / a9;\n            sum += x9;\n        }\n\n        if (a >= a10) {\n            a = (a * ONE_20) / a10;\n            sum += x10;\n        }\n\n        if (a >= a11) {\n            a = (a * ONE_20) / a11;\n            sum += x11;\n        }\n\n        // a is now a small number (smaller than a_11, which roughly equals 1.06). This means we can use a Taylor series\n        // that converges rapidly for values of `a` close to one - the same one used in ln_36.\n        // Let z = (a - 1) / (a + 1).\n        // ln(a) = 2 * (z + z^3 / 3 + z^5 / 5 + z^7 / 7 + ... + z^(2 * n + 1) / (2 * n + 1))\n\n        // Recall that 20 digit fixed point division requires multiplying by ONE_20, and multiplication requires\n        // division by ONE_20.\n        int256 z = ((a - ONE_20) * ONE_20) / (a + ONE_20);\n        int256 z_squared = (z * z) / ONE_20;\n\n        // num is the numerator of the series: the z^(2 * n + 1) term\n        int256 num = z;\n\n        // seriesSum holds the accumulated sum of each term in the series, starting with the initial z\n        int256 seriesSum = num;\n\n        // In each step, the numerator is multiplied by z^2\n        num = (num * z_squared) / ONE_20;\n        seriesSum += num / 3;\n\n        num = (num * z_squared) / ONE_20;\n        seriesSum += num / 5;\n\n        num = (num * z_squared) / ONE_20;\n        seriesSum += num / 7;\n\n        num = (num * z_squared) / ONE_20;\n        seriesSum += num / 9;\n\n        num = (num * z_squared) / ONE_20;\n        seriesSum += num / 11;\n\n        // 6 Taylor terms are sufficient for 36 decimal precision.\n\n        // Finally, we multiply by 2 (non fixed point) to compute ln(remainder)\n        seriesSum *= 2;\n\n        // We now have the sum of all x_n present, and the Taylor approximation of the logarithm of the remainder (both\n        // with 20 decimals). All that remains is to sum these two, and then drop two digits to return a 18 decimal\n        // value.\n\n        return (sum + seriesSum) / 100;\n    }\n\n    /**\n     * @dev Logarithm (log(arg, base), with signed 18 decimal fixed point base and argument argument.\n     */\n    function log(int256 arg, int256 base) internal pure returns (int256) {\n        // This performs a simple base change: log(arg, base) = ln(arg) / ln(base).\n\n        // Both logBase and logArg are computed as 36 decimal fixed point numbers, either by using ln_36, or by\n        // upscaling.\n\n        int256 logBase;\n        if (LN_36_LOWER_BOUND < base && base < LN_36_UPPER_BOUND) {\n            logBase = ln_36(base);\n        } else {\n            logBase = ln(base) * ONE_18;\n        }\n\n        int256 logArg;\n        if (LN_36_LOWER_BOUND < arg && arg < LN_36_UPPER_BOUND) {\n            logArg = ln_36(arg);\n        } else {\n            logArg = ln(arg) * ONE_18;\n        }\n\n        // When dividing, we multiply by ONE_18 to arrive at a result with 18 decimal places\n        return (logArg * ONE_18) / logBase;\n    }\n\n    /**\n     * @dev High precision (36 decimal places) natural logarithm (ln(x)) with signed 18 decimal fixed point argument,\n     * for x close to one.\n     *\n     * Should only be used if x is between LN_36_LOWER_BOUND and LN_36_UPPER_BOUND.\n     */\n    function ln_36(int256 x) private pure returns (int256) {\n        // Since ln(1) = 0, a value of x close to one will yield a very small result, which makes using 36 digits\n        // worthwhile.\n\n        // First, we transform x to a 36 digit fixed point value.\n        x *= ONE_18;\n\n        // We will use the following Taylor expansion, which converges very rapidly. Let z = (x - 1) / (x + 1).\n        // ln(x) = 2 * (z + z^3 / 3 + z^5 / 5 + z^7 / 7 + ... + z^(2 * n + 1) / (2 * n + 1))\n\n        // Recall that 36 digit fixed point division requires multiplying by ONE_36, and multiplication requires\n        // division by ONE_36.\n        int256 z = ((x - ONE_36) * ONE_36) / (x + ONE_36);\n        int256 z_squared = (z * z) / ONE_36;\n\n        // num is the numerator of the series: the z^(2 * n + 1) term\n        int256 num = z;\n\n        // seriesSum holds the accumulated sum of each term in the series, starting with the initial z\n        int256 seriesSum = num;\n\n        // In each step, the numerator is multiplied by z^2\n        num = (num * z_squared) / ONE_36;\n        seriesSum += num / 3;\n\n        num = (num * z_squared) / ONE_36;\n        seriesSum += num / 5;\n\n        num = (num * z_squared) / ONE_36;\n        seriesSum += num / 7;\n\n        num = (num * z_squared) / ONE_36;\n        seriesSum += num / 9;\n\n        num = (num * z_squared) / ONE_36;\n        seriesSum += num / 11;\n\n        num = (num * z_squared) / ONE_36;\n        seriesSum += num / 13;\n\n        num = (num * z_squared) / ONE_36;\n        seriesSum += num / 15;\n\n        // 8 Taylor terms are sufficient for 36 decimal precision.\n\n        // All that remains is multiplying by 2 (non fixed point).\n        return seriesSum * 2;\n    }\n}\n"
    },
    "contracts/pools/BasePool.sol": {
      "content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program.  If not, see <http://www.gnu.org/licenses/>.\n\npragma solidity ^0.7.0;\npragma experimental ABIEncoderV2;\n\nimport \"../lib/math/FixedPoint.sol\";\nimport \"../lib/helpers/InputHelpers.sol\";\nimport \"../lib/helpers/TemporarilyPausable.sol\";\nimport \"../lib/openzeppelin/ERC20.sol\";\n\nimport \"./BalancerPoolToken.sol\";\nimport \"./BasePoolAuthorization.sol\";\nimport \"../vault/interfaces/IVault.sol\";\nimport \"../vault/interfaces/IBasePool.sol\";\n\n// This contract relies on tons of immutable state variables to perform efficient lookup, without resorting to storage\n// reads. Because immutable arrays are not supported, we instead declare a fixed set of state variables plus a total\n// count, resulting in a large number of state variables.\n\n// solhint-disable max-states-count\n\n/**\n * @dev Reference implementation for the base layer of a Pool contract that manages a single Pool with an immutable set\n * of registered tokens, no Asset Managers, an admin-controlled swap fee percentage, and an emergency pause mechanism.\n *\n * Note that neither swap fees nor the pause mechanism are used by this contract. They are passed through so that\n * derived contracts can use them via the `_addSwapFeeAmount` and `_subtractSwapFeeAmount` functions, and the\n * `whenNotPaused` modifier.\n *\n * No admin permissions are checked here: instead, this contract delegates that to the Vault's own Authorizer.\n *\n * Because this contract doesn't implement the swap hooks, derived contracts should generally inherit from\n * BaseGeneralPool or BaseMinimalSwapInfoPool. Otherwise, subclasses must inherit from the corresponding interfaces\n * and implement the swap callbacks themselves.\n */\nabstract contract BasePool is IBasePool, BasePoolAuthorization, BalancerPoolToken, TemporarilyPausable {\n    using FixedPoint for uint256;\n\n    uint256 private constant _MIN_TOKENS = 2;\n    uint256 private constant _MAX_TOKENS = 8;\n\n    // 1e18 corresponds to 1.0, or a 100% fee\n    uint256 private constant _MIN_SWAP_FEE_PERCENTAGE = 1e12; // 0.0001%\n    uint256 private constant _MAX_SWAP_FEE_PERCENTAGE = 1e17; // 10%\n\n    uint256 private constant _MINIMUM_BPT = 1e6;\n\n    uint256 internal _swapFeePercentage;\n\n    IVault private immutable _vault;\n    bytes32 private immutable _poolId;\n    uint256 private immutable _totalTokens;\n\n    IERC20 internal immutable _token0;\n    IERC20 internal immutable _token1;\n    IERC20 internal immutable _token2;\n    IERC20 internal immutable _token3;\n    IERC20 internal immutable _token4;\n    IERC20 internal immutable _token5;\n    IERC20 internal immutable _token6;\n    IERC20 internal immutable _token7;\n\n    // All token balances are normalized to behave as if the token had 18 decimals. We assume a token's decimals will\n    // not change throughout its lifetime, and store the corresponding scaling factor for each at construction time.\n    // These factors are always greater than or equal to one: tokens with more than 18 decimals are not supported.\n\n    uint256 internal immutable _scalingFactor0;\n    uint256 internal immutable _scalingFactor1;\n    uint256 internal immutable _scalingFactor2;\n    uint256 internal immutable _scalingFactor3;\n    uint256 internal immutable _scalingFactor4;\n    uint256 internal immutable _scalingFactor5;\n    uint256 internal immutable _scalingFactor6;\n    uint256 internal immutable _scalingFactor7;\n\n    event SwapFeePercentageChanged(uint256 swapFeePercentage);\n\n    constructor(\n        IVault vault,\n        IVault.PoolSpecialization specialization,\n        string memory name,\n        string memory symbol,\n        IERC20[] memory tokens,\n        uint256 swapFeePercentage,\n        uint256 pauseWindowDuration,\n        uint256 bufferPeriodDuration,\n        address owner\n    )\n        // Base Pools are expected to be deployed using factories. By using the factory address as the action\n        // disambiguator, we make all Pools deployed by the same factory share action identifiers. This allows for\n        // simpler management of permissions (such as being able to manage granting the 'set fee percentage' action in\n        // any Pool created by the same factory), while still making action identifiers unique among different factories\n        // if the selectors match, preventing accidental errors.\n        Authentication(bytes32(uint256(msg.sender)))\n        BalancerPoolToken(name, symbol)\n        BasePoolAuthorization(owner)\n        TemporarilyPausable(pauseWindowDuration, bufferPeriodDuration)\n    {\n        _require(tokens.length >= _MIN_TOKENS, Errors.MIN_TOKENS);\n        _require(tokens.length <= _MAX_TOKENS, Errors.MAX_TOKENS);\n\n        // The Vault only requires the token list to be ordered for the Two Token Pools specialization. However,\n        // to make the developer experience consistent, we are requiring this condition for all the native pools.\n        // Also, since these Pools will register tokens only once, we can ensure the Pool tokens will follow the same\n        // order. We rely on this property to make Pools simpler to write, as it lets us assume that the\n        // order of token-specific parameters (such as token weights) will not change.\n        InputHelpers.ensureArrayIsSorted(tokens);\n\n        _setSwapFeePercentage(swapFeePercentage);\n\n        bytes32 poolId = vault.registerPool(specialization);\n\n        // Pass in zero addresses for Asset Managers\n        vault.registerTokens(poolId, tokens, new address[](tokens.length));\n\n        // Set immutable state variables - these cannot be read from during construction\n        _vault = vault;\n        _poolId = poolId;\n        _totalTokens = tokens.length;\n\n        // Immutable variables cannot be initialized inside an if statement, so we must do conditional assignments\n        _token0 = tokens.length > 0 ? tokens[0] : IERC20(0);\n        _token1 = tokens.length > 1 ? tokens[1] : IERC20(0);\n        _token2 = tokens.length > 2 ? tokens[2] : IERC20(0);\n        _token3 = tokens.length > 3 ? tokens[3] : IERC20(0);\n        _token4 = tokens.length > 4 ? tokens[4] : IERC20(0);\n        _token5 = tokens.length > 5 ? tokens[5] : IERC20(0);\n        _token6 = tokens.length > 6 ? tokens[6] : IERC20(0);\n        _token7 = tokens.length > 7 ? tokens[7] : IERC20(0);\n\n        _scalingFactor0 = tokens.length > 0 ? _computeScalingFactor(tokens[0]) : 0;\n        _scalingFactor1 = tokens.length > 1 ? _computeScalingFactor(tokens[1]) : 0;\n        _scalingFactor2 = tokens.length > 2 ? _computeScalingFactor(tokens[2]) : 0;\n        _scalingFactor3 = tokens.length > 3 ? _computeScalingFactor(tokens[3]) : 0;\n        _scalingFactor4 = tokens.length > 4 ? _computeScalingFactor(tokens[4]) : 0;\n        _scalingFactor5 = tokens.length > 5 ? _computeScalingFactor(tokens[5]) : 0;\n        _scalingFactor6 = tokens.length > 6 ? _computeScalingFactor(tokens[6]) : 0;\n        _scalingFactor7 = tokens.length > 7 ? _computeScalingFactor(tokens[7]) : 0;\n    }\n\n    // Getters / Setters\n\n    function getVault() public view returns (IVault) {\n        return _vault;\n    }\n\n    function getPoolId() public view returns (bytes32) {\n        return _poolId;\n    }\n\n    function _getTotalTokens() internal view returns (uint256) {\n        return _totalTokens;\n    }\n\n    function getSwapFeePercentage() external view returns (uint256) {\n        return _swapFeePercentage;\n    }\n\n    // Caller must be approved by the Vault's Authorizer\n    function setSwapFeePercentage(uint256 swapFeePercentage) external virtual authenticate whenNotPaused {\n        _setSwapFeePercentage(swapFeePercentage);\n    }\n\n    function _setSwapFeePercentage(uint256 swapFeePercentage) private {\n        _require(swapFeePercentage >= _MIN_SWAP_FEE_PERCENTAGE, Errors.MIN_SWAP_FEE_PERCENTAGE);\n        _require(swapFeePercentage <= _MAX_SWAP_FEE_PERCENTAGE, Errors.MAX_SWAP_FEE_PERCENTAGE);\n\n        _swapFeePercentage = swapFeePercentage;\n        emit SwapFeePercentageChanged(swapFeePercentage);\n    }\n\n    // Caller must be approved by the Vault's Authorizer\n    function setPaused(bool paused) external authenticate {\n        _setPaused(paused);\n    }\n\n    // Join / Exit Hooks\n\n    modifier onlyVault(bytes32 poolId) {\n        _require(msg.sender == address(getVault()), Errors.CALLER_NOT_VAULT);\n        _require(poolId == getPoolId(), Errors.INVALID_POOL_ID);\n        _;\n    }\n\n    function onJoinPool(\n        bytes32 poolId,\n        address sender,\n        address recipient,\n        uint256[] memory balances,\n        uint256 lastChangeBlock,\n        uint256 protocolSwapFeePercentage,\n        bytes memory userData\n    ) external virtual override onlyVault(poolId) returns (uint256[] memory, uint256[] memory) {\n        uint256[] memory scalingFactors = _scalingFactors();\n\n        if (totalSupply() == 0) {\n            (uint256 bptAmountOut, uint256[] memory amountsIn) = _onInitializePool(poolId, sender, recipient, userData);\n\n            // On initialization, we lock _MINIMUM_BPT by minting it for the zero address. This BPT acts as a minimum\n            // as it will never be burned, which reduces potential issues with rounding, and also prevents the Pool from\n            // ever being fully drained.\n            _require(bptAmountOut >= _MINIMUM_BPT, Errors.MINIMUM_BPT);\n            _mintPoolTokens(address(0), _MINIMUM_BPT);\n            _mintPoolTokens(recipient, bptAmountOut - _MINIMUM_BPT);\n\n            // amountsIn are amounts entering the Pool, so we round up.\n            _downscaleUpArray(amountsIn, scalingFactors);\n\n            return (amountsIn, new uint256[](_getTotalTokens()));\n        } else {\n            _upscaleArray(balances, scalingFactors);\n            (uint256 bptAmountOut, uint256[] memory amountsIn, uint256[] memory dueProtocolFeeAmounts) = _onJoinPool(\n                poolId,\n                sender,\n                recipient,\n                balances,\n                lastChangeBlock,\n                protocolSwapFeePercentage,\n                userData\n            );\n\n            // Note we no longer use `balances` after calling `_onJoinPool`, which may mutate it.\n\n            _mintPoolTokens(recipient, bptAmountOut);\n\n            // amountsIn are amounts entering the Pool, so we round up.\n            _downscaleUpArray(amountsIn, scalingFactors);\n            // dueProtocolFeeAmounts are amounts exiting the Pool, so we round down.\n            _downscaleDownArray(dueProtocolFeeAmounts, scalingFactors);\n\n            return (amountsIn, dueProtocolFeeAmounts);\n        }\n    }\n\n    function onExitPool(\n        bytes32 poolId,\n        address sender,\n        address recipient,\n        uint256[] memory balances,\n        uint256 lastChangeBlock,\n        uint256 protocolSwapFeePercentage,\n        bytes memory userData\n    ) external virtual override onlyVault(poolId) returns (uint256[] memory, uint256[] memory) {\n        uint256[] memory scalingFactors = _scalingFactors();\n        _upscaleArray(balances, scalingFactors);\n\n        (uint256 bptAmountIn, uint256[] memory amountsOut, uint256[] memory dueProtocolFeeAmounts) = _onExitPool(\n            poolId,\n            sender,\n            recipient,\n            balances,\n            lastChangeBlock,\n            protocolSwapFeePercentage,\n            userData\n        );\n\n        // Note we no longer use `balances` after calling `_onExitPool`, which may mutate it.\n\n        _burnPoolTokens(sender, bptAmountIn);\n\n        // Both amountsOut and dueProtocolFeeAmounts are amounts exiting the Pool, so we round down.\n        _downscaleDownArray(amountsOut, scalingFactors);\n        _downscaleDownArray(dueProtocolFeeAmounts, scalingFactors);\n\n        return (amountsOut, dueProtocolFeeAmounts);\n    }\n\n    // Query functions\n\n    /**\n     * @dev Returns the amount of BPT that would be granted to `recipient` if the `onJoinPool` hook were called by the\n     * Vault with the same arguments, along with the number of tokens `sender` would have to supply.\n     *\n     * This function is not meant to be called directly, but rather from a helper contract that fetches current Vault\n     * data, such as the protocol swap fee percentage and Pool balances.\n     *\n     * Like `IVault.queryBatchSwap`, this function is not view due to internal implementation details: the caller must\n     * explicitly use eth_call instead of eth_sendTransaction.\n     */\n    function queryJoin(\n        bytes32 poolId,\n        address sender,\n        address recipient,\n        uint256[] memory balances,\n        uint256 lastChangeBlock,\n        uint256 protocolSwapFeePercentage,\n        bytes memory userData\n    ) external returns (uint256 bptOut, uint256[] memory amountsIn) {\n        InputHelpers.ensureInputLengthMatch(balances.length, _getTotalTokens());\n\n        _queryAction(\n            poolId,\n            sender,\n            recipient,\n            balances,\n            lastChangeBlock,\n            protocolSwapFeePercentage,\n            userData,\n            _onJoinPool,\n            _downscaleUpArray\n        );\n\n        // The `return` opcode is executed directly inside `_queryAction`, so execution never reaches this statement,\n        // and we don't need to return anything here - it just silences compiler warnings.\n        return (bptOut, amountsIn);\n    }\n\n    /**\n     * @dev Returns the amount of BPT that would be burned from `sender` if the `onExitPool` hook were called by the\n     * Vault with the same arguments, along with the number of tokens `recipient` would receive.\n     *\n     * This function is not meant to be called directly, but rather from a helper contract that fetches current Vault\n     * data, such as the protocol swap fee percentage and Pool balances.\n     *\n     * Like `IVault.queryBatchSwap`, this function is not view due to internal implementation details: the caller must\n     * explicitly use eth_call instead of eth_sendTransaction.\n     */\n    function queryExit(\n        bytes32 poolId,\n        address sender,\n        address recipient,\n        uint256[] memory balances,\n        uint256 lastChangeBlock,\n        uint256 protocolSwapFeePercentage,\n        bytes memory userData\n    ) external returns (uint256 bptIn, uint256[] memory amountsOut) {\n        InputHelpers.ensureInputLengthMatch(balances.length, _getTotalTokens());\n\n        _queryAction(\n            poolId,\n            sender,\n            recipient,\n            balances,\n            lastChangeBlock,\n            protocolSwapFeePercentage,\n            userData,\n            _onExitPool,\n            _downscaleDownArray\n        );\n\n        // The `return` opcode is executed directly inside `_queryAction`, so execution never reaches this statement,\n        // and we don't need to return anything here - it just silences compiler warnings.\n        return (bptIn, amountsOut);\n    }\n\n    // Internal hooks to be overridden by derived contracts - all token amounts (except BPT) in these interfaces are\n    // upscaled.\n\n    /**\n     * @dev Called when the Pool is joined for the first time; that is, when the BPT total supply is zero.\n     *\n     * Returns the amount of BPT to mint, and the token amounts the Pool will receive in return.\n     *\n     * Minted BPT will be sent to `recipient`, except for _MINIMUM_BPT, which will be deducted from this amount and sent\n     * to the zero address instead. This will cause that BPT to remain forever locked there, preventing total BTP from\n     * ever dropping below that value, and ensuring `_onInitializePool` can only be called once in the entire Pool's\n     * lifetime.\n     *\n     * The tokens granted to the Pool will be transferred from `sender`. These amounts are considered upscaled and will\n     * be downscaled (rounding up) before being returned to the Vault.\n     */\n    function _onInitializePool(\n        bytes32 poolId,\n        address sender,\n        address recipient,\n        bytes memory userData\n    ) internal virtual returns (uint256 bptAmountOut, uint256[] memory amountsIn);\n\n    /**\n     * @dev Called whenever the Pool is joined after the first initialization join (see `_onInitializePool`).\n     *\n     * Returns the amount of BPT to mint, the token amounts that the Pool will receive in return, and the number of\n     * tokens to pay in protocol swap fees.\n     *\n     * Implementations of this function might choose to mutate the `balances` array to save gas (e.g. when\n     * performing intermediate calculations, such as subtraction of due protocol fees). This can be done safely.\n     *\n     * Minted BPT will be sent to `recipient`.\n     *\n     * The tokens granted to the Pool will be transferred from `sender`. These amounts are considered upscaled and will\n     * be downscaled (rounding up) before being returned to the Vault.\n     *\n     * Due protocol swap fees will be taken from the Pool's balance in the Vault (see `IBasePool.onJoinPool`). These\n     * amounts are considered upscaled and will be downscaled (rounding down) before being returned to the Vault.\n     */\n    function _onJoinPool(\n        bytes32 poolId,\n        address sender,\n        address recipient,\n        uint256[] memory balances,\n        uint256 lastChangeBlock,\n        uint256 protocolSwapFeePercentage,\n        bytes memory userData\n    )\n        internal\n        virtual\n        returns (\n            uint256 bptAmountOut,\n            uint256[] memory amountsIn,\n            uint256[] memory dueProtocolFeeAmounts\n        );\n\n    /**\n     * @dev Called whenever the Pool is exited.\n     *\n     * Returns the amount of BPT to burn, the token amounts for each Pool token that the Pool will grant in return, and\n     * the number of tokens to pay in protocol swap fees.\n     *\n     * Implementations of this function might choose to mutate the `balances` array to save gas (e.g. when\n     * performing intermediate calculations, such as subtraction of due protocol fees). This can be done safely.\n     *\n     * BPT will be burnt from `sender`.\n     *\n     * The Pool will grant tokens to `recipient`. These amounts are considered upscaled and will be downscaled\n     * (rounding down) before being returned to the Vault.\n     *\n     * Due protocol swap fees will be taken from the Pool's balance in the Vault (see `IBasePool.onExitPool`). These\n     * amounts are considered upscaled and will be downscaled (rounding down) before being returned to the Vault.\n     */\n    function _onExitPool(\n        bytes32 poolId,\n        address sender,\n        address recipient,\n        uint256[] memory balances,\n        uint256 lastChangeBlock,\n        uint256 protocolSwapFeePercentage,\n        bytes memory userData\n    )\n        internal\n        virtual\n        returns (\n            uint256 bptAmountIn,\n            uint256[] memory amountsOut,\n            uint256[] memory dueProtocolFeeAmounts\n        );\n\n    // Internal functions\n\n    /**\n     * @dev Adds swap fee amount to `amount`, returning a higher value.\n     */\n    function _addSwapFeeAmount(uint256 amount) internal view returns (uint256) {\n        // This returns amount + fee amount, so we round up (favoring a higher fee amount).\n        return amount.divUp(_swapFeePercentage.complement());\n    }\n\n    /**\n     * @dev Subtracts swap fee amount from `amount`, returning a lower value.\n     */\n    function _subtractSwapFeeAmount(uint256 amount) internal view returns (uint256) {\n        // This returns amount - fee amount, so we round up (favoring a higher fee amount).\n        uint256 feeAmount = amount.mulUp(_swapFeePercentage);\n        return amount.sub(feeAmount);\n    }\n\n    // Scaling\n\n    /**\n     * @dev Returns a scaling factor that, when multiplied to a token amount for `token`, normalizes its balance as if\n     * it had 18 decimals.\n     */\n    function _computeScalingFactor(IERC20 token) private view returns (uint256) {\n        // Tokens that don't implement the `decimals` method are not supported.\n        uint256 tokenDecimals = ERC20(address(token)).decimals();\n\n        // Tokens with more than 18 decimals are not supported.\n        uint256 decimalsDifference = Math.sub(18, tokenDecimals);\n        return 10**decimalsDifference;\n    }\n\n    /**\n     * @dev Returns the scaling factor for one of the Pool's tokens. Reverts if `token` is not a token registered by the\n     * Pool.\n     */\n    function _scalingFactor(IERC20 token) internal view returns (uint256) {\n        // prettier-ignore\n        if (token == _token0) { return _scalingFactor0; }\n        else if (token == _token1) { return _scalingFactor1; }\n        else if (token == _token2) { return _scalingFactor2; }\n        else if (token == _token3) { return _scalingFactor3; }\n        else if (token == _token4) { return _scalingFactor4; }\n        else if (token == _token5) { return _scalingFactor5; }\n        else if (token == _token6) { return _scalingFactor6; }\n        else if (token == _token7) { return _scalingFactor7; }\n        else {\n            _revert(Errors.INVALID_TOKEN);\n        }\n    }\n\n    /**\n     * @dev Returns all the scaling factors in the same order as the registered tokens. The Vault will always\n     * pass balances in this order when calling any of the Pool hooks\n     */\n    function _scalingFactors() internal view returns (uint256[] memory) {\n        uint256 totalTokens = _getTotalTokens();\n        uint256[] memory scalingFactors = new uint256[](totalTokens);\n\n        // prettier-ignore\n        {\n            if (totalTokens > 0) { scalingFactors[0] = _scalingFactor0; } else { return scalingFactors; }\n            if (totalTokens > 1) { scalingFactors[1] = _scalingFactor1; } else { return scalingFactors; }\n            if (totalTokens > 2) { scalingFactors[2] = _scalingFactor2; } else { return scalingFactors; }\n            if (totalTokens > 3) { scalingFactors[3] = _scalingFactor3; } else { return scalingFactors; }\n            if (totalTokens > 4) { scalingFactors[4] = _scalingFactor4; } else { return scalingFactors; }\n            if (totalTokens > 5) { scalingFactors[5] = _scalingFactor5; } else { return scalingFactors; }\n            if (totalTokens > 6) { scalingFactors[6] = _scalingFactor6; } else { return scalingFactors; }\n            if (totalTokens > 7) { scalingFactors[7] = _scalingFactor7; } else { return scalingFactors; }\n        }\n\n        return scalingFactors;\n    }\n\n    /**\n     * @dev Applies `scalingFactor` to `amount`, resulting in a larger or equal value depending on whether it needed\n     * scaling or not.\n     */\n    function _upscale(uint256 amount, uint256 scalingFactor) internal pure returns (uint256) {\n        return Math.mul(amount, scalingFactor);\n    }\n\n    /**\n     * @dev Same as `_upscale`, but for an entire array. This function does not return anything, but instead *mutates*\n     * the `amounts` array.\n     */\n    function _upscaleArray(uint256[] memory amounts, uint256[] memory scalingFactors) internal view {\n        for (uint256 i = 0; i < _getTotalTokens(); ++i) {\n            amounts[i] = Math.mul(amounts[i], scalingFactors[i]);\n        }\n    }\n\n    /**\n     * @dev Reverses the `scalingFactor` applied to `amount`, resulting in a smaller or equal value depending on\n     * whether it needed scaling or not. The result is rounded down.\n     */\n    function _downscaleDown(uint256 amount, uint256 scalingFactor) internal pure returns (uint256) {\n        return Math.divDown(amount, scalingFactor);\n    }\n\n    /**\n     * @dev Same as `_downscaleDown`, but for an entire array. This function does not return anything, but instead\n     * *mutates* the `amounts` array.\n     */\n    function _downscaleDownArray(uint256[] memory amounts, uint256[] memory scalingFactors) internal view {\n        for (uint256 i = 0; i < _getTotalTokens(); ++i) {\n            amounts[i] = Math.divDown(amounts[i], scalingFactors[i]);\n        }\n    }\n\n    /**\n     * @dev Reverses the `scalingFactor` applied to `amount`, resulting in a smaller or equal value depending on\n     * whether it needed scaling or not. The result is rounded up.\n     */\n    function _downscaleUp(uint256 amount, uint256 scalingFactor) internal pure returns (uint256) {\n        return Math.divUp(amount, scalingFactor);\n    }\n\n    /**\n     * @dev Same as `_downscaleUp`, but for an entire array. This function does not return anything, but instead\n     * *mutates* the `amounts` array.\n     */\n    function _downscaleUpArray(uint256[] memory amounts, uint256[] memory scalingFactors) internal view {\n        for (uint256 i = 0; i < _getTotalTokens(); ++i) {\n            amounts[i] = Math.divUp(amounts[i], scalingFactors[i]);\n        }\n    }\n\n    function _getAuthorizer() internal view override returns (IAuthorizer) {\n        // Access control management is delegated to the Vault's Authorizer. This lets Balancer Governance manage which\n        // accounts can call permissioned functions: for example, to perform emergency pauses.\n        // If the owner is delegated, then *all* permissioned functions, including `setSwapFeePercentage`, will be under\n        // Governance control.\n        return getVault().getAuthorizer();\n    }\n\n    function _queryAction(\n        bytes32 poolId,\n        address sender,\n        address recipient,\n        uint256[] memory balances,\n        uint256 lastChangeBlock,\n        uint256 protocolSwapFeePercentage,\n        bytes memory userData,\n        function(bytes32, address, address, uint256[] memory, uint256, uint256, bytes memory)\n            internal\n            returns (uint256, uint256[] memory, uint256[] memory) _action,\n        function(uint256[] memory, uint256[] memory) internal view _downscaleArray\n    ) private {\n        // This uses the same technique used by the Vault in queryBatchSwap. Refer to that function for a detailed\n        // explanation.\n\n        if (msg.sender != address(this)) {\n            // We perform an external call to ourselves, forwarding the same calldata. In this call, the else clause of\n            // the preceding if statement will be executed instead.\n\n            // solhint-disable-next-line avoid-low-level-calls\n            (bool success, ) = address(this).call(msg.data);\n\n            // solhint-disable-next-line no-inline-assembly\n            assembly {\n                // This call should always revert to decode the bpt and token amounts from the revert reason\n                switch success\n                    case 0 {\n                        // Note we are manually writing the memory slot 0. We can safely overwrite whatever is\n                        // stored there as we take full control of the execution and then immediately return.\n\n                        // We copy the first 4 bytes to check if it matches with the expected signature, otherwise\n                        // there was another revert reason and we should forward it.\n                        returndatacopy(0, 0, 0x04)\n                        let error := and(mload(0), 0xffffffff00000000000000000000000000000000000000000000000000000000)\n\n                        // If the first 4 bytes don't match with the expected signature, we forward the revert reason.\n                        if eq(eq(error, 0x43adbafb00000000000000000000000000000000000000000000000000000000), 0) {\n                            returndatacopy(0, 0, returndatasize())\n                            revert(0, returndatasize())\n                        }\n\n                        // The returndata contains the signature, followed by the raw memory representation of the\n                        // `bptAmount` and `tokenAmounts` (array: length + data). We need to return an ABI-encoded\n                        // representation of these.\n                        // An ABI-encoded response will include one additional field to indicate the starting offset of\n                        // the `tokenAmounts` array. The `bptAmount` will be laid out in the first word of the\n                        // returndata.\n                        //\n                        // In returndata:\n                        // [ signature ][ bptAmount ][ tokenAmounts length ][ tokenAmounts values ]\n                        // [  4 bytes  ][  32 bytes ][       32 bytes      ][ (32 * length) bytes ]\n                        //\n                        // We now need to return (ABI-encoded values):\n                        // [ bptAmount ][ tokeAmounts offset ][ tokenAmounts length ][ tokenAmounts values ]\n                        // [  32 bytes ][       32 bytes     ][       32 bytes      ][ (32 * length) bytes ]\n\n                        // We copy 32 bytes for the `bptAmount` from returndata into memory.\n                        // Note that we skip the first 4 bytes for the error signature\n                        returndatacopy(0, 0x04, 32)\n\n                        // The offsets are 32-bytes long, so the array of `tokenAmounts` will start after\n                        // the initial 64 bytes.\n                        mstore(0x20, 64)\n\n                        // We now copy the raw memory array for the `tokenAmounts` from returndata into memory.\n                        // Since bpt amount and offset take up 64 bytes, we start copying at address 0x40. We also\n                        // skip the first 36 bytes from returndata, which correspond to the signature plus bpt amount.\n                        returndatacopy(0x40, 0x24, sub(returndatasize(), 36))\n\n                        // We finally return the ABI-encoded uint256 and the array, which has a total length equal to\n                        // the size of returndata, plus the 32 bytes of the offset but without the 4 bytes of the\n                        // error signature.\n                        return(0, add(returndatasize(), 28))\n                    }\n                    default {\n                        // This call should always revert, but we fail nonetheless if that didn't happen\n                        invalid()\n                    }\n            }\n        } else {\n            uint256[] memory scalingFactors = _scalingFactors();\n            _upscaleArray(balances, scalingFactors);\n\n            (uint256 bptAmount, uint256[] memory tokenAmounts, ) = _action(\n                poolId,\n                sender,\n                recipient,\n                balances,\n                lastChangeBlock,\n                protocolSwapFeePercentage,\n                userData\n            );\n\n            _downscaleArray(tokenAmounts, scalingFactors);\n\n            // solhint-disable-next-line no-inline-assembly\n            assembly {\n                // We will return a raw representation of `bptAmount` and `tokenAmounts` in memory, which is composed of\n                // a 32-byte uint256, followed by a 32-byte for the array length, and finally the 32-byte uint256 values\n                // Because revert expects a size in bytes, we multiply the array length (stored at `tokenAmounts`) by 32\n                let size := mul(mload(tokenAmounts), 32)\n\n                // We store the `bptAmount` in the previous slot to the `tokenAmounts` array. We can make sure there\n                // will be at least one available slot due to how the memory scratch space works.\n                // We can safely overwrite whatever is stored in this slot as we will revert immediately after that.\n                let start := sub(tokenAmounts, 0x20)\n                mstore(start, bptAmount)\n\n                // We send one extra value for the error signature \"QueryError(uint256,uint256[])\" which is 0x43adbafb\n                // We use the previous slot to `bptAmount`.\n                mstore(sub(start, 0x20), 0x0000000000000000000000000000000000000000000000000000000043adbafb)\n                start := sub(start, 0x04)\n\n                // When copying from `tokenAmounts` into returndata, we copy the additional 68 bytes to also return\n                // the `bptAmount`, the array 's length, and the error signature.\n                revert(start, add(size, 68))\n            }\n        }\n    }\n}\n"
    },
    "contracts/vault/interfaces/IMinimalSwapInfoPool.sol": {
      "content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program.  If not, see <http://www.gnu.org/licenses/>.\n\npragma solidity ^0.7.0;\npragma experimental ABIEncoderV2;\n\nimport \"./IBasePool.sol\";\n\n/**\n * @dev Pool contracts with the MinimalSwapInfo or TwoToken specialization settings should implement this interface.\n *\n * This is called by the Vault when a user calls `IVault.swap` or `IVault.batchSwap` to swap with this Pool.\n * Returns the number of tokens the Pool will grant to the user in a 'given in' swap, or that the user will grant\n * to the pool in a 'given out' swap.\n *\n * This can often be implemented by a `view` function, since many pricing algorithms don't need to track state\n * changes in swaps. However, contracts implementing this in non-view functions should check that the caller is\n * indeed the Vault.\n */\ninterface IMinimalSwapInfoPool is IBasePool {\n    function onSwap(\n        SwapRequest memory swapRequest,\n        uint256 currentBalanceTokenIn,\n        uint256 currentBalanceTokenOut\n    ) external returns (uint256 amount);\n}\n"
    },
    "contracts/lib/helpers/TemporarilyPausable.sol": {
      "content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program.  If not, see <http://www.gnu.org/licenses/>.\n\npragma solidity ^0.7.0;\n\nimport \"./BalancerErrors.sol\";\nimport \"./ITemporarilyPausable.sol\";\n\n/**\n * @dev Allows for a contract to be paused during an initial period after deployment, disabling functionality. Can be\n * used as an emergency switch in case a security vulnerability or threat is identified.\n *\n * The contract can only be paused during the Pause Window, a period that starts at deployment. It can also be\n * unpaused and repaused any number of times during this period. This is intended to serve as a safety measure: it lets\n * system managers react quickly to potentially dangerous situations, knowing that this action is reversible if careful\n * analysis later determines there was a false alarm.\n *\n * If the contract is paused when the Pause Window finishes, it will remain in the paused state through an additional\n * Buffer Period, after which it will be automatically unpaused forever. This is to ensure there is always enough time\n * to react to an emergency, even if the threat is discovered shortly before the Pause Window expires.\n *\n * Note that since the contract can only be paused within the Pause Window, unpausing during the Buffer Period is\n * irreversible.\n */\nabstract contract TemporarilyPausable is ITemporarilyPausable {\n    // The Pause Window and Buffer Period are timestamp-based: they should not be relied upon for sub-minute accuracy.\n    // solhint-disable not-rely-on-time\n\n    uint256 private constant _MAX_PAUSE_WINDOW_DURATION = 90 days;\n    uint256 private constant _MAX_BUFFER_PERIOD_DURATION = 30 days;\n\n    uint256 private immutable _pauseWindowEndTime;\n    uint256 private immutable _bufferPeriodEndTime;\n\n    bool private _paused;\n\n    constructor(uint256 pauseWindowDuration, uint256 bufferPeriodDuration) {\n        _require(pauseWindowDuration <= _MAX_PAUSE_WINDOW_DURATION, Errors.MAX_PAUSE_WINDOW_DURATION);\n        _require(bufferPeriodDuration <= _MAX_BUFFER_PERIOD_DURATION, Errors.MAX_BUFFER_PERIOD_DURATION);\n\n        uint256 pauseWindowEndTime = block.timestamp + pauseWindowDuration;\n\n        _pauseWindowEndTime = pauseWindowEndTime;\n        _bufferPeriodEndTime = pauseWindowEndTime + bufferPeriodDuration;\n    }\n\n    /**\n     * @dev Reverts if the contract is paused.\n     */\n    modifier whenNotPaused() {\n        _ensureNotPaused();\n        _;\n    }\n\n    /**\n     * @dev Returns the current contract pause status, as well as the end times of the Pause Window and Buffer\n     * Period.\n     */\n    function getPausedState()\n        external\n        view\n        override\n        returns (\n            bool paused,\n            uint256 pauseWindowEndTime,\n            uint256 bufferPeriodEndTime\n        )\n    {\n        paused = !_isNotPaused();\n        pauseWindowEndTime = _getPauseWindowEndTime();\n        bufferPeriodEndTime = _getBufferPeriodEndTime();\n    }\n\n    /**\n     * @dev Sets the pause state to `paused`. The contract can only be paused until the end of the Pause Window, and\n     * unpaused until the end of the Buffer Period.\n     *\n     * Once the Buffer Period expires, this function reverts unconditionally.\n     */\n    function _setPaused(bool paused) internal {\n        if (paused) {\n            _require(block.timestamp < _getPauseWindowEndTime(), Errors.PAUSE_WINDOW_EXPIRED);\n        } else {\n            _require(block.timestamp < _getBufferPeriodEndTime(), Errors.BUFFER_PERIOD_EXPIRED);\n        }\n\n        _paused = paused;\n        emit PausedStateChanged(paused);\n    }\n\n    /**\n     * @dev Reverts if the contract is paused.\n     */\n    function _ensureNotPaused() internal view {\n        _require(_isNotPaused(), Errors.PAUSED);\n    }\n\n    /**\n     * @dev Returns true if the contract is unpaused.\n     *\n     * Once the Buffer Period expires, the gas cost of calling this function is reduced dramatically, as storage is no\n     * longer accessed.\n     */\n    function _isNotPaused() internal view returns (bool) {\n        // After the Buffer Period, the (inexpensive) timestamp check short-circuits the storage access.\n        return block.timestamp > _getBufferPeriodEndTime() || !_paused;\n    }\n\n    // These getters lead to reduced bytecode size by inlining the immutable variables in a single place.\n\n    function _getPauseWindowEndTime() private view returns (uint256) {\n        return _pauseWindowEndTime;\n    }\n\n    function _getBufferPeriodEndTime() private view returns (uint256) {\n        return _bufferPeriodEndTime;\n    }\n}\n"
    },
    "contracts/lib/openzeppelin/ERC20.sol": {
      "content": "// SPDX-License-Identifier: MIT\n\npragma solidity ^0.7.0;\n\nimport \"../helpers/BalancerErrors.sol\";\n\nimport \"./IERC20.sol\";\nimport \"./SafeMath.sol\";\n\n/**\n * @dev Implementation of the {IERC20} interface.\n *\n * This implementation is agnostic to the way tokens are created. This means\n * that a supply mechanism has to be added in a derived contract using {_mint}.\n * For a generic mechanism see {ERC20PresetMinterPauser}.\n *\n * TIP: For a detailed writeup see our guide\n * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How\n * to implement supply mechanisms].\n *\n * We have followed general OpenZeppelin guidelines: functions revert instead\n * of returning `false` on failure. This behavior is nonetheless conventional\n * and does not conflict with the expectations of ERC20 applications.\n *\n * Additionally, an {Approval} event is emitted on calls to {transferFrom}.\n * This allows applications to reconstruct the allowance for all accounts just\n * by listening to said events. Other implementations of the EIP may not emit\n * these events, as it isn't required by the specification.\n *\n * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}\n * functions have been added to mitigate the well-known issues around setting\n * allowances. See {IERC20-approve}.\n */\ncontract ERC20 is IERC20 {\n    using SafeMath for uint256;\n\n    mapping(address => uint256) private _balances;\n\n    mapping(address => mapping(address => uint256)) private _allowances;\n\n    uint256 private _totalSupply;\n\n    string private _name;\n    string private _symbol;\n    uint8 private _decimals;\n\n    /**\n     * @dev Sets the values for {name} and {symbol}, initializes {decimals} with\n     * a default value of 18.\n     *\n     * To select a different value for {decimals}, use {_setupDecimals}.\n     *\n     * All three of these values are immutable: they can only be set once during\n     * construction.\n     */\n    constructor(string memory name_, string memory symbol_) {\n        _name = name_;\n        _symbol = symbol_;\n        _decimals = 18;\n    }\n\n    /**\n     * @dev Returns the name of the token.\n     */\n    function name() public view returns (string memory) {\n        return _name;\n    }\n\n    /**\n     * @dev Returns the symbol of the token, usually a shorter version of the\n     * name.\n     */\n    function symbol() public view returns (string memory) {\n        return _symbol;\n    }\n\n    /**\n     * @dev Returns the number of decimals used to get its user representation.\n     * For example, if `decimals` equals `2`, a balance of `505` tokens should\n     * be displayed to a user as `5,05` (`505 / 10 ** 2`).\n     *\n     * Tokens usually opt for a value of 18, imitating the relationship between\n     * Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is\n     * called.\n     *\n     * NOTE: This information is only used for _display_ purposes: it in\n     * no way affects any of the arithmetic of the contract, including\n     * {IERC20-balanceOf} and {IERC20-transfer}.\n     */\n    function decimals() public view returns (uint8) {\n        return _decimals;\n    }\n\n    /**\n     * @dev See {IERC20-totalSupply}.\n     */\n    function totalSupply() public view override returns (uint256) {\n        return _totalSupply;\n    }\n\n    /**\n     * @dev See {IERC20-balanceOf}.\n     */\n    function balanceOf(address account) public view override returns (uint256) {\n        return _balances[account];\n    }\n\n    /**\n     * @dev See {IERC20-transfer}.\n     *\n     * Requirements:\n     *\n     * - `recipient` cannot be the zero address.\n     * - the caller must have a balance of at least `amount`.\n     */\n    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {\n        _transfer(msg.sender, recipient, amount);\n        return true;\n    }\n\n    /**\n     * @dev See {IERC20-allowance}.\n     */\n    function allowance(address owner, address spender) public view virtual override returns (uint256) {\n        return _allowances[owner][spender];\n    }\n\n    /**\n     * @dev See {IERC20-approve}.\n     *\n     * Requirements:\n     *\n     * - `spender` cannot be the zero address.\n     */\n    function approve(address spender, uint256 amount) public virtual override returns (bool) {\n        _approve(msg.sender, spender, amount);\n        return true;\n    }\n\n    /**\n     * @dev See {IERC20-transferFrom}.\n     *\n     * Emits an {Approval} event indicating the updated allowance. This is not\n     * required by the EIP. See the note at the beginning of {ERC20}.\n     *\n     * Requirements:\n     *\n     * - `sender` and `recipient` cannot be the zero address.\n     * - `sender` must have a balance of at least `amount`.\n     * - the caller must have allowance for ``sender``'s tokens of at least\n     * `amount`.\n     */\n    function transferFrom(\n        address sender,\n        address recipient,\n        uint256 amount\n    ) public virtual override returns (bool) {\n        _transfer(sender, recipient, amount);\n        _approve(\n            sender,\n            msg.sender,\n            _allowances[sender][msg.sender].sub(amount, Errors.ERC20_TRANSFER_EXCEEDS_ALLOWANCE)\n        );\n        return true;\n    }\n\n    /**\n     * @dev Atomically increases the allowance granted to `spender` by the caller.\n     *\n     * This is an alternative to {approve} that can be used as a mitigation for\n     * problems described in {IERC20-approve}.\n     *\n     * Emits an {Approval} event indicating the updated allowance.\n     *\n     * Requirements:\n     *\n     * - `spender` cannot be the zero address.\n     */\n    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {\n        _approve(msg.sender, spender, _allowances[msg.sender][spender].add(addedValue));\n        return true;\n    }\n\n    /**\n     * @dev Atomically decreases the allowance granted to `spender` by the caller.\n     *\n     * This is an alternative to {approve} that can be used as a mitigation for\n     * problems described in {IERC20-approve}.\n     *\n     * Emits an {Approval} event indicating the updated allowance.\n     *\n     * Requirements:\n     *\n     * - `spender` cannot be the zero address.\n     * - `spender` must have allowance for the caller of at least\n     * `subtractedValue`.\n     */\n    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {\n        _approve(\n            msg.sender,\n            spender,\n            _allowances[msg.sender][spender].sub(subtractedValue, Errors.ERC20_DECREASED_ALLOWANCE_BELOW_ZERO)\n        );\n        return true;\n    }\n\n    /**\n     * @dev Moves tokens `amount` from `sender` to `recipient`.\n     *\n     * This is internal function is equivalent to {transfer}, and can be used to\n     * e.g. implement automatic token fees, slashing mechanisms, etc.\n     *\n     * Emits a {Transfer} event.\n     *\n     * Requirements:\n     *\n     * - `sender` cannot be the zero address.\n     * - `recipient` cannot be the zero address.\n     * - `sender` must have a balance of at least `amount`.\n     */\n    function _transfer(\n        address sender,\n        address recipient,\n        uint256 amount\n    ) internal virtual {\n        _require(sender != address(0), Errors.ERC20_TRANSFER_FROM_ZERO_ADDRESS);\n        _require(recipient != address(0), Errors.ERC20_TRANSFER_TO_ZERO_ADDRESS);\n\n        _beforeTokenTransfer(sender, recipient, amount);\n\n        _balances[sender] = _balances[sender].sub(amount, Errors.ERC20_TRANSFER_EXCEEDS_BALANCE);\n        _balances[recipient] = _balances[recipient].add(amount);\n        emit Transfer(sender, recipient, amount);\n    }\n\n    /** @dev Creates `amount` tokens and assigns them to `account`, increasing\n     * the total supply.\n     *\n     * Emits a {Transfer} event with `from` set to the zero address.\n     *\n     * Requirements:\n     *\n     * - `to` cannot be the zero address.\n     */\n    function _mint(address account, uint256 amount) internal virtual {\n        _require(account != address(0), Errors.ERC20_MINT_TO_ZERO_ADDRESS);\n\n        _beforeTokenTransfer(address(0), account, amount);\n\n        _totalSupply = _totalSupply.add(amount);\n        _balances[account] = _balances[account].add(amount);\n        emit Transfer(address(0), account, amount);\n    }\n\n    /**\n     * @dev Destroys `amount` tokens from `account`, reducing the\n     * total supply.\n     *\n     * Emits a {Transfer} event with `to` set to the zero address.\n     *\n     * Requirements:\n     *\n     * - `account` cannot be the zero address.\n     * - `account` must have at least `amount` tokens.\n     */\n    function _burn(address account, uint256 amount) internal virtual {\n        _require(account != address(0), Errors.ERC20_BURN_FROM_ZERO_ADDRESS);\n\n        _beforeTokenTransfer(account, address(0), amount);\n\n        _balances[account] = _balances[account].sub(amount, Errors.ERC20_BURN_EXCEEDS_ALLOWANCE);\n        _totalSupply = _totalSupply.sub(amount);\n        emit Transfer(account, address(0), amount);\n    }\n\n    /**\n     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.\n     *\n     * This internal function is equivalent to `approve`, and can be used to\n     * e.g. set automatic allowances for certain subsystems, etc.\n     *\n     * Emits an {Approval} event.\n     *\n     * Requirements:\n     *\n     * - `owner` cannot be the zero address.\n     * - `spender` cannot be the zero address.\n     */\n    function _approve(\n        address owner,\n        address spender,\n        uint256 amount\n    ) internal virtual {\n        _require(owner != address(0), Errors.ERC20_APPROVE_FROM_ZERO_ADDRESS);\n        _require(spender != address(0), Errors.ERC20_APPROVE_TO_ZERO_ADDRESS);\n\n        _allowances[owner][spender] = amount;\n        emit Approval(owner, spender, amount);\n    }\n\n    /**\n     * @dev Sets {decimals} to a value other than the default one of 18.\n     *\n     * WARNING: This function should only be called from the constructor. Most\n     * applications that interact with token contracts will not expect\n     * {decimals} to ever change, and may work incorrectly if it does.\n     */\n    function _setupDecimals(uint8 decimals_) internal {\n        _decimals = decimals_;\n    }\n\n    /**\n     * @dev Hook that is called before any transfer of tokens. This includes\n     * minting and burning.\n     *\n     * Calling conditions:\n     *\n     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens\n     * will be to transferred to `to`.\n     * - when `from` is zero, `amount` tokens will be minted for `to`.\n     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.\n     * - `from` and `to` are never both zero.\n     *\n     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].\n     */\n    function _beforeTokenTransfer(\n        address from,\n        address to,\n        uint256 amount\n    ) internal virtual {}\n}\n"
    },
    "contracts/pools/BalancerPoolToken.sol": {
      "content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program.  If not, see <http://www.gnu.org/licenses/>.\n\npragma solidity ^0.7.0;\n\nimport \"../lib/math/Math.sol\";\nimport \"../lib/openzeppelin/IERC20.sol\";\nimport \"../lib/openzeppelin/IERC20Permit.sol\";\nimport \"../lib/openzeppelin/EIP712.sol\";\n\n/**\n * @title Highly opinionated token implementation\n * @author Balancer Labs\n * @dev\n * - Includes functions to increase and decrease allowance as a workaround\n *   for the well-known issue with `approve`:\n *   https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729\n * - Allows for 'infinite allowance', where an allowance of 0xff..ff is not\n *   decreased by calls to transferFrom\n * - Lets a token holder use `transferFrom` to send their own tokens,\n *   without first setting allowance\n * - Emits 'Approval' events whenever allowance is changed by `transferFrom`\n */\ncontract BalancerPoolToken is IERC20, IERC20Permit, EIP712 {\n    using Math for uint256;\n\n    // State variables\n\n    uint8 private constant _DECIMALS = 18;\n\n    mapping(address => uint256) private _balance;\n    mapping(address => mapping(address => uint256)) private _allowance;\n    uint256 private _totalSupply;\n\n    string private _name;\n    string private _symbol;\n\n    mapping(address => uint256) private _nonces;\n\n    // solhint-disable-next-line var-name-mixedcase\n    bytes32 private immutable _PERMIT_TYPE_HASH = keccak256(\n        \"Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)\"\n    );\n\n    // Function declarations\n\n    constructor(string memory tokenName, string memory tokenSymbol) EIP712(tokenName, \"1\") {\n        _name = tokenName;\n        _symbol = tokenSymbol;\n    }\n\n    // External functions\n\n    function allowance(address owner, address spender) external view override returns (uint256) {\n        return _allowance[owner][spender];\n    }\n\n    function balanceOf(address account) external view override returns (uint256) {\n        return _balance[account];\n    }\n\n    function approve(address spender, uint256 amount) external override returns (bool) {\n        _setAllowance(msg.sender, spender, amount);\n\n        return true;\n    }\n\n    function increaseApproval(address spender, uint256 amount) external returns (bool) {\n        _setAllowance(msg.sender, spender, _allowance[msg.sender][spender].add(amount));\n\n        return true;\n    }\n\n    function decreaseApproval(address spender, uint256 amount) external returns (bool) {\n        uint256 currentAllowance = _allowance[msg.sender][spender];\n\n        if (amount >= currentAllowance) {\n            _setAllowance(msg.sender, spender, 0);\n        } else {\n            _setAllowance(msg.sender, spender, currentAllowance.sub(amount));\n        }\n\n        return true;\n    }\n\n    function transfer(address recipient, uint256 amount) external override returns (bool) {\n        _move(msg.sender, recipient, amount);\n\n        return true;\n    }\n\n    function transferFrom(\n        address sender,\n        address recipient,\n        uint256 amount\n    ) external override returns (bool) {\n        uint256 currentAllowance = _allowance[sender][msg.sender];\n        _require(msg.sender == sender || currentAllowance >= amount, Errors.INSUFFICIENT_ALLOWANCE);\n\n        _move(sender, recipient, amount);\n\n        if (msg.sender != sender && currentAllowance != uint256(-1)) {\n            // Because of the previous require, we know that if msg.sender != sender then currentAllowance >= amount\n            _setAllowance(sender, msg.sender, currentAllowance - amount);\n        }\n\n        return true;\n    }\n\n    function permit(\n        address owner,\n        address spender,\n        uint256 value,\n        uint256 deadline,\n        uint8 v,\n        bytes32 r,\n        bytes32 s\n    ) public virtual override {\n        // solhint-disable-next-line not-rely-on-time\n        _require(block.timestamp <= deadline, Errors.EXPIRED_PERMIT);\n\n        uint256 nonce = _nonces[owner];\n\n        bytes32 structHash = keccak256(abi.encode(_PERMIT_TYPE_HASH, owner, spender, value, nonce, deadline));\n\n        bytes32 hash = _hashTypedDataV4(structHash);\n\n        address signer = ecrecover(hash, v, r, s);\n        _require((signer != address(0)) && (signer == owner), Errors.INVALID_SIGNATURE);\n\n        _nonces[owner] = nonce + 1;\n        _setAllowance(owner, spender, value);\n    }\n\n    // Public functions\n\n    function name() public view returns (string memory) {\n        return _name;\n    }\n\n    function symbol() public view returns (string memory) {\n        return _symbol;\n    }\n\n    function decimals() public pure returns (uint8) {\n        return _DECIMALS;\n    }\n\n    function totalSupply() public view override returns (uint256) {\n        return _totalSupply;\n    }\n\n    function nonces(address owner) external view override returns (uint256) {\n        return _nonces[owner];\n    }\n\n    // solhint-disable-next-line func-name-mixedcase\n    function DOMAIN_SEPARATOR() external view override returns (bytes32) {\n        return _domainSeparatorV4();\n    }\n\n    // Internal functions\n\n    function _mintPoolTokens(address recipient, uint256 amount) internal {\n        _balance[recipient] = _balance[recipient].add(amount);\n        _totalSupply = _totalSupply.add(amount);\n        emit Transfer(address(0), recipient, amount);\n    }\n\n    function _burnPoolTokens(address sender, uint256 amount) internal {\n        uint256 currentBalance = _balance[sender];\n        _require(currentBalance >= amount, Errors.INSUFFICIENT_BALANCE);\n\n        _balance[sender] = currentBalance - amount;\n        _totalSupply = _totalSupply.sub(amount);\n        emit Transfer(sender, address(0), amount);\n    }\n\n    function _move(\n        address sender,\n        address recipient,\n        uint256 amount\n    ) internal {\n        uint256 currentBalance = _balance[sender];\n        _require(currentBalance >= amount, Errors.INSUFFICIENT_BALANCE);\n        // Prohibit transfers to the zero address to avoid confusion with the\n        // Transfer event emitted by `_burnPoolTokens`\n        _require(recipient != address(0), Errors.ERC20_TRANSFER_TO_ZERO_ADDRESS);\n\n        _balance[sender] = currentBalance - amount;\n        _balance[recipient] = _balance[recipient].add(amount);\n\n        emit Transfer(sender, recipient, amount);\n    }\n\n    // Private functions\n\n    function _setAllowance(\n        address owner,\n        address spender,\n        uint256 amount\n    ) private {\n        _allowance[owner][spender] = amount;\n        emit Approval(owner, spender, amount);\n    }\n}\n"
    },
    "contracts/pools/BasePoolAuthorization.sol": {
      "content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program.  If not, see <http://www.gnu.org/licenses/>.\n\npragma solidity ^0.7.0;\n\nimport \"../lib/helpers/Authentication.sol\";\nimport \"../vault/interfaces/IAuthorizer.sol\";\n\nimport \"./BasePool.sol\";\n\n/**\n * @dev Base authorization layer implementation for Pools.\n *\n * The owner account can call some of the permissioned functions - access control of the rest is delegated to the\n * Authorizer. Note that this owner is immutable: more sophisticated permission schemes, such as multiple ownership,\n * granular roles, etc., could be built on top of this by making the owner a smart contract.\n *\n * Access control of all other permissioned functions is delegated to an Authorizer. It is also possible to delegate\n * control of *all* permissioned functions to the Authorizer by setting the owner address to `_DELEGATE_OWNER`.\n */\nabstract contract BasePoolAuthorization is Authentication {\n    address private immutable _owner;\n\n    address private constant _DELEGATE_OWNER = 0xBA1BA1ba1BA1bA1bA1Ba1BA1ba1BA1bA1ba1ba1B;\n\n    constructor(address owner) {\n        _owner = owner;\n    }\n\n    function getOwner() public view returns (address) {\n        return _owner;\n    }\n\n    function getAuthorizer() external view returns (IAuthorizer) {\n        return _getAuthorizer();\n    }\n\n    function _canPerform(bytes32 actionId, address account) internal view override returns (bool) {\n        if ((getOwner() != _DELEGATE_OWNER) && _isOwnerOnlyAction(actionId)) {\n            // Only the owner can perform \"owner only\" actions, unless the owner is delegated.\n            return msg.sender == getOwner();\n        } else {\n            // Non-owner actions are always processed via the Authorizer, as \"owner only\" ones are when delegated.\n            return _getAuthorizer().canPerform(actionId, account, address(this));\n        }\n    }\n\n    function _isOwnerOnlyAction(bytes32 actionId) private view returns (bool) {\n        // This implementation hardcodes the setSwapFeePercentage action identifier.\n        return actionId == getActionId(BasePool.setSwapFeePercentage.selector);\n    }\n\n    function _getAuthorizer() internal view virtual returns (IAuthorizer);\n}\n"
    },
    "contracts/lib/openzeppelin/SafeMath.sol": {
      "content": "// SPDX-License-Identifier: MIT\n\npragma solidity ^0.7.0;\n\nimport \"../helpers/BalancerErrors.sol\";\n\n/**\n * @dev Wrappers over Solidity's arithmetic operations with added overflow\n * checks.\n *\n * Arithmetic operations in Solidity wrap on overflow. This can easily result\n * in bugs, because programmers usually assume that an overflow raises an\n * error, which is the standard behavior in high level programming languages.\n * `SafeMath` restores this intuition by reverting the transaction when an\n * operation overflows.\n *\n * Using this library instead of the unchecked operations eliminates an entire\n * class of bugs, so it's recommended to use it always.\n */\nlibrary SafeMath {\n    /**\n     * @dev Returns the addition of two unsigned integers, reverting on\n     * overflow.\n     *\n     * Counterpart to Solidity's `+` operator.\n     *\n     * Requirements:\n     *\n     * - Addition cannot overflow.\n     */\n    function add(uint256 a, uint256 b) internal pure returns (uint256) {\n        uint256 c = a + b;\n        _require(c >= a, Errors.ADD_OVERFLOW);\n\n        return c;\n    }\n\n    /**\n     * @dev Returns the subtraction of two unsigned integers, reverting on\n     * overflow (when the result is negative).\n     *\n     * Counterpart to Solidity's `-` operator.\n     *\n     * Requirements:\n     *\n     * - Subtraction cannot overflow.\n     */\n    function sub(uint256 a, uint256 b) internal pure returns (uint256) {\n        return sub(a, b, Errors.SUB_OVERFLOW);\n    }\n\n    /**\n     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on\n     * overflow (when the result is negative).\n     *\n     * Counterpart to Solidity's `-` operator.\n     *\n     * Requirements:\n     *\n     * - Subtraction cannot overflow.\n     */\n    function sub(uint256 a, uint256 b, uint256 errorCode) internal pure returns (uint256) {\n        _require(b <= a, errorCode);\n        uint256 c = a - b;\n\n        return c;\n    }\n}\n"
    },
    "contracts/lib/math/Math.sol": {
      "content": "// SPDX-License-Identifier: MIT\n\npragma solidity ^0.7.0;\n\nimport \"../helpers/BalancerErrors.sol\";\n\n/**\n * @dev Wrappers over Solidity's arithmetic operations with added overflow checks.\n * Adapted from OpenZeppelin's SafeMath library\n */\nlibrary Math {\n    /**\n     * @dev Returns the addition of two unsigned integers of 256 bits, reverting on overflow.\n     */\n    function add(uint256 a, uint256 b) internal pure returns (uint256) {\n        uint256 c = a + b;\n        _require(c >= a, Errors.ADD_OVERFLOW);\n        return c;\n    }\n\n    /**\n     * @dev Returns the addition of two signed integers, reverting on overflow.\n     */\n    function add(int256 a, int256 b) internal pure returns (int256) {\n        int256 c = a + b;\n        _require((b >= 0 && c >= a) || (b < 0 && c < a), Errors.ADD_OVERFLOW);\n        return c;\n    }\n\n    /**\n     * @dev Returns the subtraction of two unsigned integers of 256 bits, reverting on overflow.\n     */\n    function sub(uint256 a, uint256 b) internal pure returns (uint256) {\n        _require(b <= a, Errors.SUB_OVERFLOW);\n        uint256 c = a - b;\n        return c;\n    }\n\n    /**\n     * @dev Returns the subtraction of two signed integers, reverting on overflow.\n     */\n    function sub(int256 a, int256 b) internal pure returns (int256) {\n        int256 c = a - b;\n        _require((b >= 0 && c <= a) || (b < 0 && c > a), Errors.SUB_OVERFLOW);\n        return c;\n    }\n\n    /**\n     * @dev Returns the largest of two numbers of 256 bits.\n     */\n    function max(uint256 a, uint256 b) internal pure returns (uint256) {\n        return a >= b ? a : b;\n    }\n\n    /**\n     * @dev Returns the smallest of two numbers of 256 bits.\n     */\n    function min(uint256 a, uint256 b) internal pure returns (uint256) {\n        return a < b ? a : b;\n    }\n\n    function mul(uint256 a, uint256 b) internal pure returns (uint256) {\n        uint256 c = a * b;\n        _require(a == 0 || c / a == b, Errors.MUL_OVERFLOW);\n        return c;\n    }\n\n    function divDown(uint256 a, uint256 b) internal pure returns (uint256) {\n        _require(b != 0, Errors.ZERO_DIVISION);\n        return a / b;\n    }\n\n    function divUp(uint256 a, uint256 b) internal pure returns (uint256) {\n        _require(b != 0, Errors.ZERO_DIVISION);\n\n        if (a == 0) {\n            return 0;\n        } else {\n            return 1 + (a - 1) / b;\n        }\n    }\n}\n"
    },
    "contracts/lib/openzeppelin/IERC20Permit.sol": {
      "content": "// SPDX-License-Identifier: MIT\n\npragma solidity ^0.7.0;\n\n/**\n * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in\n * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].\n *\n * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by\n * presenting a message signed by the account. By not relying on `{IERC20-approve}`, the token holder account doesn't\n * need to send a transaction, and thus is not required to hold Ether at all.\n */\ninterface IERC20Permit {\n    /**\n     * @dev Sets `value` as the allowance of `spender` over `owner`'s tokens,\n     * given `owner`'s signed approval.\n     *\n     * IMPORTANT: The same issues {IERC20-approve} has related to transaction\n     * ordering also apply here.\n     *\n     * Emits an {Approval} event.\n     *\n     * Requirements:\n     *\n     * - `spender` cannot be the zero address.\n     * - `deadline` must be a timestamp in the future.\n     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`\n     * over the EIP712-formatted function arguments.\n     * - the signature must use ``owner``'s current nonce (see {nonces}).\n     *\n     * For more information on the signature format, see the\n     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP\n     * section].\n     */\n    function permit(\n        address owner,\n        address spender,\n        uint256 value,\n        uint256 deadline,\n        uint8 v,\n        bytes32 r,\n        bytes32 s\n    ) external;\n\n    /**\n     * @dev Returns the current nonce for `owner`. This value must be\n     * included whenever a signature is generated for {permit}.\n     *\n     * Every successful call to {permit} increases ``owner``'s nonce by one. This\n     * prevents a signature from being used multiple times.\n     */\n    function nonces(address owner) external view returns (uint256);\n\n    /**\n     * @dev Returns the domain separator used in the encoding of the signature for `permit`, as defined by {EIP712}.\n     */\n    // solhint-disable-next-line func-name-mixedcase\n    function DOMAIN_SEPARATOR() external view returns (bytes32);\n}\n"
    },
    "contracts/lib/openzeppelin/EIP712.sol": {
      "content": "// SPDX-License-Identifier: MIT\n\npragma solidity ^0.7.0;\n\n/**\n * @dev https://eips.ethereum.org/EIPS/eip-712[EIP 712] is a standard for hashing and signing of typed structured data.\n *\n * The encoding specified in the EIP is very generic, and such a generic implementation in Solidity is not feasible,\n * thus this contract does not implement the encoding itself. Protocols need to implement the type-specific encoding\n * they need in their contracts using a combination of `abi.encode` and `keccak256`.\n *\n * This contract implements the EIP 712 domain separator ({_domainSeparatorV4}) that is used as part of the encoding\n * scheme, and the final step of the encoding to obtain the message digest that is then signed via ECDSA\n * ({_hashTypedDataV4}).\n *\n * The implementation of the domain separator was designed to be as efficient as possible while still properly updating\n * the chain id to protect against replay attacks on an eventual fork of the chain.\n *\n * NOTE: This contract implements the version of the encoding known as \"v4\", as implemented by the JSON RPC method\n * https://docs.metamask.io/guide/signing-data.html[`eth_signTypedDataV4` in MetaMask].\n *\n * _Available since v3.4._\n */\nabstract contract EIP712 {\n    /* solhint-disable var-name-mixedcase */\n    bytes32 private immutable _HASHED_NAME;\n    bytes32 private immutable _HASHED_VERSION;\n    bytes32 private immutable _TYPE_HASH;\n\n    /* solhint-enable var-name-mixedcase */\n\n    /**\n     * @dev Initializes the domain separator and parameter caches.\n     *\n     * The meaning of `name` and `version` is specified in\n     * https://eips.ethereum.org/EIPS/eip-712#definition-of-domainseparator[EIP 712]:\n     *\n     * - `name`: the user readable name of the signing domain, i.e. the name of the DApp or the protocol.\n     * - `version`: the current major version of the signing domain.\n     *\n     * NOTE: These parameters cannot be changed except through a xref:learn::upgrading-smart-contracts.adoc[smart\n     * contract upgrade].\n     */\n    constructor(string memory name, string memory version) {\n        _HASHED_NAME = keccak256(bytes(name));\n        _HASHED_VERSION = keccak256(bytes(version));\n        _TYPE_HASH = keccak256(\"EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)\");\n    }\n\n    /**\n     * @dev Returns the domain separator for the current chain.\n     */\n    function _domainSeparatorV4() internal view virtual returns (bytes32) {\n        return keccak256(abi.encode(_TYPE_HASH, _HASHED_NAME, _HASHED_VERSION, _getChainId(), address(this)));\n    }\n\n    /**\n     * @dev Given an already https://eips.ethereum.org/EIPS/eip-712#definition-of-hashstruct[hashed struct], this\n     * function returns the hash of the fully encoded EIP712 message for this domain.\n     *\n     * This hash can be used together with {ECDSA-recover} to obtain the signer of a message. For example:\n     *\n     * ```solidity\n     * bytes32 digest = _hashTypedDataV4(keccak256(abi.encode(\n     *     keccak256(\"Mail(address to,string contents)\"),\n     *     mailTo,\n     *     keccak256(bytes(mailContents))\n     * )));\n     * address signer = ECDSA.recover(digest, signature);\n     * ```\n     */\n    function _hashTypedDataV4(bytes32 structHash) internal view virtual returns (bytes32) {\n        return keccak256(abi.encodePacked(\"\\x19\\x01\", _domainSeparatorV4(), structHash));\n    }\n\n    function _getChainId() private view returns (uint256 chainId) {\n        // Silence state mutability warning without generating bytecode.\n        // See https://github.com/ethereum/solidity/issues/10090#issuecomment-741789128 and\n        // https://github.com/ethereum/solidity/issues/2691\n        this;\n\n        // solhint-disable-next-line no-inline-assembly\n        assembly {\n            chainId := chainid()\n        }\n    }\n}\n"
    }
  },
  "settings": {
    "optimizer": {
      "enabled": true,
      "runs": 800
    },
    "outputSelection": {
      "*": {
        "*": [
          "evm.bytecode",
          "evm.deployedBytecode",
          "abi"
        ]
      }
    },
    "libraries": {}
  }
}