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import codecs
import re
from string import ascii_letters, ascii_lowercase, digits
from typing import Optional, cast
BASCII_LOWERCASE = ascii_lowercase.encode("ascii")
BPCT_ALLOWED = {f"%{i:02X}".encode("ascii") for i in range(256)}
GEN_DELIMS = ":/?#[]@"
SUB_DELIMS_WITHOUT_QS = "!$'()*,"
SUB_DELIMS = SUB_DELIMS_WITHOUT_QS + "+&=;"
RESERVED = GEN_DELIMS + SUB_DELIMS
UNRESERVED = ascii_letters + digits + "-._~"
ALLOWED = UNRESERVED + SUB_DELIMS_WITHOUT_QS
_IS_HEX = re.compile(b"[A-Z0-9][A-Z0-9]")
_IS_HEX_STR = re.compile("[A-Fa-f0-9][A-Fa-f0-9]")
utf8_decoder = codecs.getincrementaldecoder("utf-8")
class _Quoter:
def __init__(
self,
*,
safe: str = "",
protected: str = "",
qs: bool = False,
requote: bool = True,
) -> None:
self._safe = safe
self._protected = protected
self._qs = qs
self._requote = requote
def __call__(self, val: Optional[str]) -> Optional[str]:
if val is None:
return None
if not isinstance(val, str):
raise TypeError("Argument should be str")
if not val:
return ""
bval = cast(str, val).encode("utf8", errors="ignore")
ret = bytearray()
pct = bytearray()
safe = self._safe
safe += ALLOWED
if not self._qs:
safe += "+&=;"
safe += self._protected
bsafe = safe.encode("ascii")
idx = 0
while idx < len(bval):
ch = bval[idx]
idx += 1
if pct:
if ch in BASCII_LOWERCASE:
ch = ch - 32 # convert to uppercase
pct.append(ch)
if len(pct) == 3: # pragma: no branch # peephole optimizer
buf = pct[1:]
if not _IS_HEX.match(buf):
ret.extend(b"%25")
pct.clear()
idx -= 2
continue
try:
unquoted = chr(int(pct[1:].decode("ascii"), base=16))
except ValueError:
ret.extend(b"%25")
pct.clear()
idx -= 2
continue
if unquoted in self._protected:
ret.extend(pct)
elif unquoted in safe:
ret.append(ord(unquoted))
else:
ret.extend(pct)
pct.clear()
# special case, if we have only one char after "%"
elif len(pct) == 2 and idx == len(bval):
ret.extend(b"%25")
pct.clear()
idx -= 1
continue
elif ch == ord("%") and self._requote:
pct.clear()
pct.append(ch)
# special case if "%" is last char
if idx == len(bval):
ret.extend(b"%25")
continue
if self._qs:
if ch == ord(" "):
ret.append(ord("+"))
continue
if ch in bsafe:
ret.append(ch)
continue
ret.extend((f"%{ch:02X}").encode("ascii"))
ret2 = ret.decode("ascii")
if ret2 == val:
return val
return ret2
class _Unquoter:
def __init__(self, *, unsafe: str = "", qs: bool = False) -> None:
self._unsafe = unsafe
self._qs = qs
self._quoter = _Quoter()
self._qs_quoter = _Quoter(qs=True)
def __call__(self, val: Optional[str]) -> Optional[str]:
if val is None:
return None
if not isinstance(val, str):
raise TypeError("Argument should be str")
if not val:
return ""
decoder = cast(codecs.BufferedIncrementalDecoder, utf8_decoder())
ret = []
idx = 0
while idx < len(val):
ch = val[idx]
idx += 1
if ch == "%" and idx <= len(val) - 2:
pct = val[idx : idx + 2]
if _IS_HEX_STR.fullmatch(pct):
b = bytes([int(pct, base=16)])
idx += 2
try:
unquoted = decoder.decode(b)
except UnicodeDecodeError:
start_pct = idx - 3 - len(decoder.buffer) * 3
ret.append(val[start_pct : idx - 3])
decoder.reset()
try:
unquoted = decoder.decode(b)
except UnicodeDecodeError:
ret.append(val[idx - 3 : idx])
continue
if not unquoted:
continue
if self._qs and unquoted in "+=&;":
to_add = self._qs_quoter(unquoted)
if to_add is None: # pragma: no cover
raise RuntimeError("Cannot quote None")
ret.append(to_add)
elif unquoted in self._unsafe:
to_add = self._quoter(unquoted)
if to_add is None: # pragma: no cover
raise RuntimeError("Cannot quote None")
ret.append(to_add)
else:
ret.append(unquoted)
continue
if decoder.buffer:
start_pct = idx - 1 - len(decoder.buffer) * 3
ret.append(val[start_pct : idx - 1])
decoder.reset()
if ch == "+":
if not self._qs or ch in self._unsafe:
ret.append("+")
else:
ret.append(" ")
continue
if ch in self._unsafe:
ret.append("%")
h = hex(ord(ch)).upper()[2:]
for ch in h:
ret.append(ch)
continue
ret.append(ch)
if decoder.buffer:
ret.append(val[-len(decoder.buffer) * 3 :])
ret2 = "".join(ret)
if ret2 == val:
return val
return ret2
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