You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
 
 
 
 
 
 

204 lines
6.4 KiB

import re
from string import ascii_letters, ascii_lowercase, digits
from typing import Optional, TYPE_CHECKING, cast
BASCII_LOWERCASE = ascii_lowercase.encode("ascii")
BPCT_ALLOWED = {"%{:02X}".format(i).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]")
class _Quoter:
def __init__(
self, *, safe: str = "", protected: str = "", qs: bool = False
) -> None:
self._safe = safe
self._protected = protected
self._qs = qs
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("%"):
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(("%{:02X}".format(ch)).encode("ascii"))
return ret.decode("ascii")
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 ""
pct = ""
last_pct = ""
pcts = bytearray()
ret = []
for ch in val:
if pct:
pct += ch
if len(pct) == 3: # pragma: no branch # peephole optimizer
pcts.append(int(pct[1:], base=16))
last_pct = pct
pct = ""
continue
if pcts:
try:
unquoted = pcts.decode("utf8")
except UnicodeDecodeError:
pass
else:
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._qs_quoter(unquoted)
if to_add is None: # pragma: no cover
raise RuntimeError("Cannot quote None")
ret.append(to_add)
else:
ret.append(unquoted)
del pcts[:]
if ch == "%":
pct = ch
continue
if pcts:
ret.append(last_pct) # %F8ab
last_pct = ""
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 pcts:
try:
unquoted = pcts.decode("utf8")
except UnicodeDecodeError:
ret.append(last_pct) # %F8
else:
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._qs_quoter(unquoted)
if to_add is None: # pragma: no cover
raise RuntimeError("Cannot quote None")
ret.append(to_add)
else:
ret.append(unquoted)
return "".join(ret)
_PyQuoter = _Quoter
_PyUnquoter = _Unquoter
if not TYPE_CHECKING: # pragma: no branch
try:
from ._quoting import _Quoter, _Unquoter
except ImportError: # pragma: no cover
_Quoter = _PyQuoter
_Unquoter = _PyUnquoter