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from __future__ import annotations
import logging
import re
import sys
import typing as t
from datetime import datetime
from datetime import timezone
if t.TYPE_CHECKING:
from _typeshed.wsgi import WSGIEnvironment
from .wrappers.request import Request
_logger: logging.Logger | None = None
class _Missing:
def __repr__(self) -> str:
return "no value"
def __reduce__(self) -> str:
return "_missing"
_missing = _Missing()
def _wsgi_decoding_dance(s: str) -> str:
return s.encode("latin1").decode(errors="replace")
def _wsgi_encoding_dance(s: str) -> str:
return s.encode().decode("latin1")
def _get_environ(obj: WSGIEnvironment | Request) -> WSGIEnvironment:
env = getattr(obj, "environ", obj)
assert isinstance(
env, dict
), f"{type(obj).__name__!r} is not a WSGI environment (has to be a dict)"
return env
def _has_level_handler(logger: logging.Logger) -> bool:
"""Check if there is a handler in the logging chain that will handle
the given logger's effective level.
"""
level = logger.getEffectiveLevel()
current = logger
while current:
if any(handler.level <= level for handler in current.handlers):
return True
if not current.propagate:
break
current = current.parent # type: ignore
return False
class _ColorStreamHandler(logging.StreamHandler): # type: ignore[type-arg]
"""On Windows, wrap stream with Colorama for ANSI style support."""
def __init__(self) -> None:
try:
import colorama
except ImportError:
stream = None
else:
stream = colorama.AnsiToWin32(sys.stderr)
super().__init__(stream)
def _log(type: str, message: str, *args: t.Any, **kwargs: t.Any) -> None:
"""Log a message to the 'werkzeug' logger.
The logger is created the first time it is needed. If there is no
level set, it is set to :data:`logging.INFO`. If there is no handler
for the logger's effective level, a :class:`logging.StreamHandler`
is added.
"""
global _logger
if _logger is None:
_logger = logging.getLogger("werkzeug")
if _logger.level == logging.NOTSET:
_logger.setLevel(logging.INFO)
if not _has_level_handler(_logger):
_logger.addHandler(_ColorStreamHandler())
getattr(_logger, type)(message.rstrip(), *args, **kwargs)
@t.overload
def _dt_as_utc(dt: None) -> None: ...
@t.overload
def _dt_as_utc(dt: datetime) -> datetime: ...
def _dt_as_utc(dt: datetime | None) -> datetime | None:
if dt is None:
return dt
if dt.tzinfo is None:
return dt.replace(tzinfo=timezone.utc)
elif dt.tzinfo != timezone.utc:
return dt.astimezone(timezone.utc)
return dt
_TAccessorValue = t.TypeVar("_TAccessorValue")
class _DictAccessorProperty(t.Generic[_TAccessorValue]):
"""Baseclass for `environ_property` and `header_property`."""
read_only = False
def __init__(
self,
name: str,
default: _TAccessorValue | None = None,
load_func: t.Callable[[str], _TAccessorValue] | None = None,
dump_func: t.Callable[[_TAccessorValue], str] | None = None,
read_only: bool | None = None,
doc: str | None = None,
) -> None:
self.name = name
self.default = default
self.load_func = load_func
self.dump_func = dump_func
if read_only is not None:
self.read_only = read_only
self.__doc__ = doc
def lookup(self, instance: t.Any) -> t.MutableMapping[str, t.Any]:
raise NotImplementedError
@t.overload
def __get__(
self, instance: None, owner: type
) -> _DictAccessorProperty[_TAccessorValue]: ...
@t.overload
def __get__(self, instance: t.Any, owner: type) -> _TAccessorValue: ...
def __get__(
self, instance: t.Any | None, owner: type
) -> _TAccessorValue | _DictAccessorProperty[_TAccessorValue]:
if instance is None:
return self
storage = self.lookup(instance)
if self.name not in storage:
return self.default # type: ignore
value = storage[self.name]
if self.load_func is not None:
try:
return self.load_func(value)
except (ValueError, TypeError):
return self.default # type: ignore
return value # type: ignore
def __set__(self, instance: t.Any, value: _TAccessorValue) -> None:
if self.read_only:
raise AttributeError("read only property")
if self.dump_func is not None:
self.lookup(instance)[self.name] = self.dump_func(value)
else:
self.lookup(instance)[self.name] = value
def __delete__(self, instance: t.Any) -> None:
if self.read_only:
raise AttributeError("read only property")
self.lookup(instance).pop(self.name, None)
def __repr__(self) -> str:
return f"<{type(self).__name__} {self.name}>"
_plain_int_re = re.compile(r"-?\d+", re.ASCII)
def _plain_int(value: str) -> int:
"""Parse an int only if it is only ASCII digits and ``-``.
This disallows ``+``, ``_``, and non-ASCII digits, which are accepted by ``int`` but
are not allowed in HTTP header values.
Any leading or trailing whitespace is stripped
"""
value = value.strip()
if _plain_int_re.fullmatch(value) is None:
raise ValueError
return int(value)
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