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// This contract is part of Zellic’s smart contract dataset, which is a collection of publicly available contract code gathered as of March 2023. |
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// SPDX-License-Identifier: MIT
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// BLOCK ROULETTE GAME
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// ____ _ ___ ____ _ __ ____ ___ _ _ _ _____ _____ _____ _____
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// | __ )| | / _ \ / ___| |/ / | _ \ / _ \| | | | | | ____|_ _|_ _| ____|
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// | _ \| | | | | | | | ' / | |_) | | | | | | | | | _| | | | | | _|
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// | |_) | |__| |_| | |___| . \ | _ <| |_| | |_| | |___| |___ | | | | | |___
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// |____/|_____\___/ \____|_|\_\ |_| \_\\___/ \___/|_____|_____| |_| |_| |_____|
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//
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// TICKET BUYS ONLY FOR FIRST 10,000 BLOCKS, THEN OPEN TRADING IS ENABLED AUTOMATICALLY
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// EARLIER BUYS = MORE TICKETS
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// GAME CANNOT BE PAUSED OR RESTARTED
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// WAITING ROOM: T.ME/BLOCKROULETTE
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// File: @openzeppelin/contracts@4.7.3/utils/Context.sol
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// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)
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pragma solidity ^0.8.0;
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/**
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* @dev Provides information about the current execution context, including the
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* sender of the transaction and its data. While these are generally available
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* via msg.sender and msg.data, they should not be accessed in such a direct
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* manner, since when dealing with meta-transactions the account sending and
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* paying for execution may not be the actual sender (as far as an application
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* is concerned).
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*
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* This contract is only required for intermediate, library-like contracts.
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*/
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abstract contract Context {
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function _msgSender() internal view virtual returns (address) {
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return msg.sender;
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}
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function _msgData() internal view virtual returns (bytes calldata) {
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return msg.data;
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}
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}
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// File: @openzeppelin/contracts@4.7.3/access/Ownable.sol
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// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)
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pragma solidity ^0.8.0;
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/**
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* @dev Contract module which provides a basic access control mechanism, where
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* there is an account (an owner) that can be granted exclusive access to
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* specific functions.
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*
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* By default, the owner account will be the one that deploys the contract. This
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* can later be changed with {transferOwnership}.
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*
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* This module is used through inheritance. It will make available the modifier
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* `onlyOwner`, which can be applied to your functions to restrict their use to
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* the owner.
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*/
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abstract contract Ownable is Context {
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address private _owner;
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event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
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/**
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* @dev Initializes the contract setting the deployer as the initial owner.
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*/
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constructor() {
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_transferOwnership(_msgSender());
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}
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/**
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* @dev Throws if called by any account other than the owner.
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*/
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modifier onlyOwner() {
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_checkOwner();
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_;
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}
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/**
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* @dev Returns the address of the current owner.
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*/
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function owner() public view virtual returns (address) {
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return _owner;
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}
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/**
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* @dev Throws if the sender is not the owner.
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*/
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function _checkOwner() internal view virtual {
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require(owner() == _msgSender(), "Ownable: caller is not the owner");
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}
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/**
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* @dev Leaves the contract without owner. It will not be possible to call
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* `onlyOwner` functions anymore. Can only be called by the current owner.
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*
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* NOTE: Renouncing ownership will leave the contract without an owner,
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* thereby removing any functionality that is only available to the owner.
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*/
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function renounceOwnership() public virtual onlyOwner {
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_transferOwnership(address(0));
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}
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/**
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* @dev Transfers ownership of the contract to a new account (`newOwner`).
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* Can only be called by the current owner.
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*/
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function transferOwnership(address newOwner) public virtual onlyOwner {
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require(newOwner != address(0), "Ownable: new owner is the zero address");
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_transferOwnership(newOwner);
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}
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/**
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* @dev Transfers ownership of the contract to a new account (`newOwner`).
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* Internal function without access restriction.
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*/
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function _transferOwnership(address newOwner) internal virtual {
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address oldOwner = _owner;
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_owner = newOwner;
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emit OwnershipTransferred(oldOwner, newOwner);
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}
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}
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// File: @openzeppelin/contracts@4.7.3/token/ERC20/IERC20.sol
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// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)
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pragma solidity ^0.8.0;
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/**
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* @dev Interface of the ERC20 standard as defined in the EIP.
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*/
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interface IERC20 {
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/**
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* @dev Emitted when `value` tokens are moved from one account (`from`) to
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* another (`to`).
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*
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* Note that `value` may be zero.
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*/
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event Transfer(address indexed from, address indexed to, uint256 value);
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/**
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* @dev Emitted when the allowance of a `spender` for an `owner` is set by
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* a call to {approve}. `value` is the new allowance.
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*/
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event Approval(address indexed owner, address indexed spender, uint256 value);
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/**
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* @dev Returns the amount of tokens in existence.
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*/
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function totalSupply() external view returns (uint256);
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/**
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* @dev Returns the amount of tokens owned by `account`.
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*/
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function balanceOf(address account) external view returns (uint256);
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/**
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* @dev Moves `amount` tokens from the caller's account to `to`.
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*
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* Returns a boolean value indicating whether the operation succeeded.
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*
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* Emits a {Transfer} event.
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*/
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function transfer(address to, uint256 amount) external returns (bool);
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/**
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* @dev Returns the remaining number of tokens that `spender` will be
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* allowed to spend on behalf of `owner` through {transferFrom}. This is
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* zero by default.
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*
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* This value changes when {approve} or {transferFrom} are called.
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*/
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function allowance(address owner, address spender) external view returns (uint256);
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/**
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* @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
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*
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* Returns a boolean value indicating whether the operation succeeded.
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*
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* IMPORTANT: Beware that changing an allowance with this method brings the risk
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* that someone may use both the old and the new allowance by unfortunate
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* transaction ordering. One possible solution to mitigate this race
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* condition is to first reduce the spender's allowance to 0 and set the
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* desired value afterwards:
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* https://github.com/ethereum/EIPs/issues/20
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*
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* Emits an {Approval} event.
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*/
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function approve(address spender, uint256 amount) external returns (bool);
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/**
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* @dev Moves `amount` tokens from `from` to `to` using the
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* allowance mechanism. `amount` is then deducted from the caller's
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* allowance.
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*
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* Returns a boolean value indicating whether the operation succeeded.
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*
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* Emits a {Transfer} event.
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*/
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function transferFrom(
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address from,
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address to,
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uint256 amount
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) external returns (bool);
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}
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// File: @openzeppelin/contracts@4.7.3/token/ERC20/extensions/IERC20Metadata.sol
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// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)
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pragma solidity ^0.8.0;
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/**
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* @dev Interface for the optional metadata functions from the ERC20 standard.
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*
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* _Available since v4.1._
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*/
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interface IERC20Metadata is IERC20 {
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/**
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* @dev Returns the name of the token.
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*/
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function name() external view returns (string memory);
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/**
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* @dev Returns the symbol of the token.
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*/
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function symbol() external view returns (string memory);
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/**
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* @dev Returns the decimals places of the token.
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*/
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function decimals() external view returns (uint8);
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}
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// File: @openzeppelin/contracts@4.7.3/token/ERC20/ERC20.sol
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// OpenZeppelin Contracts (last updated v4.7.0) (token/ERC20/ERC20.sol)
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pragma solidity ^0.8.0;
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/**
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* @dev Implementation of the {IERC20} interface.
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*
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* This implementation is agnostic to the way tokens are created. This means
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* that a supply mechanism has to be added in a derived contract using {_mint}.
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* For a generic mechanism see {ERC20PresetMinterPauser}.
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*
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* TIP: For a detailed writeup see our guide
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* https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
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* to implement supply mechanisms].
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*
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* We have followed general OpenZeppelin Contracts guidelines: functions revert
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* instead returning `false` on failure. This behavior is nonetheless
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* conventional and does not conflict with the expectations of ERC20
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* applications.
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*
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* Additionally, an {Approval} event is emitted on calls to {transferFrom}.
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* This allows applications to reconstruct the allowance for all accounts just
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* by listening to said events. Other implementations of the EIP may not emit
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* these events, as it isn't required by the specification.
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*
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* Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
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* functions have been added to mitigate the well-known issues around setting
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* allowances. See {IERC20-approve}.
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*/
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contract ERC20 is Context, IERC20, IERC20Metadata {
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mapping(address => uint256) private _balances;
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mapping(address => mapping(address => uint256)) private _allowances;
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uint256 private _totalSupply;
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string private _name;
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string private _symbol;
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/**
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* @dev Sets the values for {name} and {symbol}.
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*
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* The default value of {decimals} is 18. To select a different value for
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* {decimals} you should overload it.
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*
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* All two of these values are immutable: they can only be set once during
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* construction.
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*/
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constructor(string memory name_, string memory symbol_) {
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_name = name_;
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_symbol = symbol_;
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}
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/**
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* @dev Returns the name of the token.
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*/
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function name() public view virtual override returns (string memory) {
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return _name;
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}
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/**
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* @dev Returns the symbol of the token, usually a shorter version of the
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* name.
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*/
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function symbol() public view virtual override returns (string memory) {
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return _symbol;
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}
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/**
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* @dev Returns the number of decimals used to get its user representation.
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* For example, if `decimals` equals `2`, a balance of `505` tokens should
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* be displayed to a user as `5.05` (`505 / 10 ** 2`).
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*
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* Tokens usually opt for a value of 18, imitating the relationship between
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* Ether and Wei. This is the value {ERC20} uses, unless this function is
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* overridden;
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*
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* NOTE: This information is only used for _display_ purposes: it in
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* no way affects any of the arithmetic of the contract, including
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* {IERC20-balanceOf} and {IERC20-transfer}.
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*/
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function decimals() public view virtual override returns (uint8) {
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return 18;
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}
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/**
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* @dev See {IERC20-totalSupply}.
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*/
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function totalSupply() public view virtual override returns (uint256) {
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return _totalSupply;
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}
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/**
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* @dev See {IERC20-balanceOf}.
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*/
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function balanceOf(address account) public view virtual override returns (uint256) {
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return _balances[account];
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}
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/**
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* @dev See {IERC20-transfer}.
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*
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* Requirements:
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*
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* - `to` cannot be the zero address.
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* - the caller must have a balance of at least `amount`.
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*/
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function transfer(address to, uint256 amount) public virtual override returns (bool) {
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address owner = _msgSender();
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_transfer(owner, to, amount);
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return true;
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}
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/**
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* @dev See {IERC20-allowance}.
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*/
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function allowance(address owner, address spender) public view virtual override returns (uint256) {
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return _allowances[owner][spender];
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}
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/**
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* @dev See {IERC20-approve}.
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*
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* NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
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* `transferFrom`. This is semantically equivalent to an infinite approval.
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*
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* Requirements:
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*
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* - `spender` cannot be the zero address.
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*/
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function approve(address spender, uint256 amount) public virtual override returns (bool) {
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address owner = _msgSender();
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_approve(owner, spender, amount);
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return true;
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}
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/**
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* @dev See {IERC20-transferFrom}.
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*
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* Emits an {Approval} event indicating the updated allowance. This is not
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* required by the EIP. See the note at the beginning of {ERC20}.
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*
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* NOTE: Does not update the allowance if the current allowance
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* is the maximum `uint256`.
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*
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* Requirements:
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*
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* - `from` and `to` cannot be the zero address.
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* - `from` must have a balance of at least `amount`.
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* - the caller must have allowance for ``from``'s tokens of at least
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* `amount`.
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*/
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function transferFrom(
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address from,
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address to,
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uint256 amount
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) public virtual override returns (bool) {
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address spender = _msgSender();
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_spendAllowance(from, spender, amount);
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_transfer(from, to, amount);
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return true;
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}
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/**
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* @dev Atomically increases the allowance granted to `spender` by the caller.
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*
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* This is an alternative to {approve} that can be used as a mitigation for
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* problems described in {IERC20-approve}.
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*
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* Emits an {Approval} event indicating the updated allowance.
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*
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* Requirements:
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*
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* - `spender` cannot be the zero address.
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*/
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function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
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address owner = _msgSender();
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_approve(owner, spender, allowance(owner, spender) + addedValue);
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return true;
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}
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/**
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* @dev Atomically decreases the allowance granted to `spender` by the caller.
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*
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* This is an alternative to {approve} that can be used as a mitigation for
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* problems described in {IERC20-approve}.
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*
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* Emits an {Approval} event indicating the updated allowance.
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*
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* Requirements:
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*
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* - `spender` cannot be the zero address.
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* - `spender` must have allowance for the caller of at least
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* `subtractedValue`.
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*/
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function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
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address owner = _msgSender();
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uint256 currentAllowance = allowance(owner, spender);
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require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
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unchecked {
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_approve(owner, spender, currentAllowance - subtractedValue);
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}
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return true;
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}
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/**
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* @dev Moves `amount` of tokens from `from` to `to`.
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*
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* This internal function is equivalent to {transfer}, and can be used to
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* e.g. implement automatic token fees, slashing mechanisms, etc.
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*
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* Emits a {Transfer} event.
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*
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* Requirements:
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*
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* - `from` cannot be the zero address.
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* - `to` cannot be the zero address.
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* - `from` must have a balance of at least `amount`.
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*/
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function _transfer(
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address from,
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address to,
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uint256 amount
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) internal virtual {
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require(from != address(0), "ERC20: transfer from the zero address");
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require(to != address(0), "ERC20: transfer to the zero address");
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_beforeTokenTransfer(from, to, amount);
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uint256 fromBalance = _balances[from];
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require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
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unchecked {
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_balances[from] = fromBalance - amount;
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}
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_balances[to] += amount;
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emit Transfer(from, to, amount);
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_afterTokenTransfer(from, to, amount);
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}
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|
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/** @dev Creates `amount` tokens and assigns them to `account`, increasing
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* the total supply.
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*
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* Emits a {Transfer} event with `from` set to the zero address.
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*
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* Requirements:
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*
|
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* - `account` cannot be the zero address.
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*/
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function _mint(address account, uint256 amount) internal virtual {
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require(account != address(0), "ERC20: mint to the zero address");
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_beforeTokenTransfer(address(0), account, amount);
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_totalSupply += amount;
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_balances[account] += amount;
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emit Transfer(address(0), account, amount);
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_afterTokenTransfer(address(0), account, amount);
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}
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/**
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* @dev Destroys `amount` tokens from `account`, reducing the
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* total supply.
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*
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* Emits a {Transfer} event with `to` set to the zero address.
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*
|
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* Requirements:
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*
|
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* - `account` cannot be the zero address.
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* - `account` must have at least `amount` tokens.
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*/
|
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function _burn(address account, uint256 amount) internal virtual {
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require(account != address(0), "ERC20: burn from the zero address");
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_beforeTokenTransfer(account, address(0), amount);
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uint256 accountBalance = _balances[account];
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require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
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unchecked {
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_balances[account] = accountBalance - amount;
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}
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_totalSupply -= amount;
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emit Transfer(account, address(0), amount);
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|
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_afterTokenTransfer(account, address(0), amount);
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}
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|
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/**
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* @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
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|
*
|
|
* This internal function is equivalent to `approve`, and can be used to
|
|
* e.g. set automatic allowances for certain subsystems, etc.
|
|
*
|
|
* Emits an {Approval} event.
|
|
*
|
|
* Requirements:
|
|
*
|
|
* - `owner` cannot be the zero address.
|
|
* - `spender` cannot be the zero address.
|
|
*/
|
|
function _approve(
|
|
address owner,
|
|
address spender,
|
|
uint256 amount
|
|
) internal virtual {
|
|
require(owner != address(0), "ERC20: approve from the zero address");
|
|
require(spender != address(0), "ERC20: approve to the zero address");
|
|
|
|
_allowances[owner][spender] = amount;
|
|
emit Approval(owner, spender, amount);
|
|
}
|
|
|
|
/**
|
|
* @dev Updates `owner` s allowance for `spender` based on spent `amount`.
|
|
*
|
|
* Does not update the allowance amount in case of infinite allowance.
|
|
* Revert if not enough allowance is available.
|
|
*
|
|
* Might emit an {Approval} event.
|
|
*/
|
|
function _spendAllowance(
|
|
address owner,
|
|
address spender,
|
|
uint256 amount
|
|
) internal virtual {
|
|
uint256 currentAllowance = allowance(owner, spender);
|
|
if (currentAllowance != type(uint256).max) {
|
|
require(currentAllowance >= amount, "ERC20: insufficient allowance");
|
|
unchecked {
|
|
_approve(owner, spender, currentAllowance - amount);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @dev Hook that is called before any transfer of tokens. This includes
|
|
* minting and burning.
|
|
*
|
|
* Calling conditions:
|
|
*
|
|
* - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
|
|
* will be transferred to `to`.
|
|
* - when `from` is zero, `amount` tokens will be minted for `to`.
|
|
* - when `to` is zero, `amount` of ``from``'s tokens will be burned.
|
|
* - `from` and `to` are never both zero.
|
|
*
|
|
* To learn more about hooks, head to xref:ROOT:extending-contracts.adoc
|
|
*/
|
|
function _beforeTokenTransfer(
|
|
address from,
|
|
address to,
|
|
uint256 amount
|
|
) internal virtual {}
|
|
|
|
/**
|
|
* @dev Hook that is called after any transfer of tokens. This includes
|
|
* minting and burning.
|
|
*
|
|
* Calling conditions:
|
|
*
|
|
* - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
|
|
* has been transferred to `to`.
|
|
* - when `from` is zero, `amount` tokens have been minted for `to`.
|
|
* - when `to` is zero, `amount` of ``from``'s tokens have been burned.
|
|
* - `from` and `to` are never both zero.
|
|
*
|
|
* To learn more about hooks, head to xref:ROOT:extending-contracts.adoc
|
|
*/
|
|
function _afterTokenTransfer(
|
|
address from,
|
|
address to,
|
|
uint256 amount
|
|
) internal virtual {}
|
|
}
|
|
|
|
// File: BlockRoulette.sol
|
|
|
|
|
|
pragma solidity ^0.8.4;
|
|
|
|
|
|
contract BlockRoulette is ERC20, Ownable {
|
|
|
|
uint public gameStartBlock;
|
|
uint public openRouletteBlock;
|
|
uint public blockDelay = 10000;
|
|
bool public isRouletteStarted = false;
|
|
bool public isOpenTrading = false;
|
|
|
|
address public uniV2Router = 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D;
|
|
|
|
constructor() ERC20("10k Block Roulette", "TKBR") {
|
|
_mint(msg.sender, 100000000000 * 10 ** decimals());
|
|
}
|
|
|
|
function _transfer(address from, address to, uint256 amount) internal override {
|
|
require(isRouletteStarted || owner() == _msgSender(), "Game not started yet");
|
|
if (block.number == openRouletteBlock){
|
|
isOpenTrading = true;
|
|
}
|
|
if (!isOpenTrading){
|
|
require(to != uniV2Router, "Open Trading not started");
|
|
}
|
|
super._transfer(from, to, amount);
|
|
}
|
|
|
|
function enableTrading() external onlyOwner {
|
|
isRouletteStarted = true;
|
|
gameStartBlock = block.number;
|
|
openRouletteBlock = gameStartBlock + blockDelay;
|
|
}
|
|
} |
