forked from bton/matekasse
341 lines
8.5 KiB
Python
341 lines
8.5 KiB
Python
from __future__ import annotations
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import logging
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import operator
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import re
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import sys
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import typing as t
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from datetime import datetime
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from datetime import timezone
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if t.TYPE_CHECKING:
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from _typeshed.wsgi import WSGIEnvironment
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from .wrappers.request import Request
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_logger: logging.Logger | None = None
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class _Missing:
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def __repr__(self) -> str:
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return "no value"
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def __reduce__(self) -> str:
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return "_missing"
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_missing = _Missing()
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@t.overload
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def _make_encode_wrapper(reference: str) -> t.Callable[[str], str]:
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...
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@t.overload
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def _make_encode_wrapper(reference: bytes) -> t.Callable[[str], bytes]:
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...
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def _make_encode_wrapper(reference: t.AnyStr) -> t.Callable[[str], t.AnyStr]:
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"""Create a function that will be called with a string argument. If
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the reference is bytes, values will be encoded to bytes.
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"""
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if isinstance(reference, str):
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return lambda x: x
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return operator.methodcaller("encode", "latin1")
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def _check_str_tuple(value: tuple[t.AnyStr, ...]) -> None:
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"""Ensure tuple items are all strings or all bytes."""
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if not value:
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return
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item_type = str if isinstance(value[0], str) else bytes
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if any(not isinstance(item, item_type) for item in value):
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raise TypeError(f"Cannot mix str and bytes arguments (got {value!r})")
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_default_encoding = sys.getdefaultencoding()
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def _to_bytes(
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x: str | bytes, charset: str = _default_encoding, errors: str = "strict"
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) -> bytes:
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if x is None or isinstance(x, bytes):
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return x
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if isinstance(x, (bytearray, memoryview)):
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return bytes(x)
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if isinstance(x, str):
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return x.encode(charset, errors)
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raise TypeError("Expected bytes")
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@t.overload
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def _to_str( # type: ignore
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x: None,
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charset: str | None = ...,
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errors: str = ...,
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allow_none_charset: bool = ...,
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) -> None:
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...
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@t.overload
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def _to_str(
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x: t.Any,
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charset: str | None = ...,
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errors: str = ...,
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allow_none_charset: bool = ...,
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) -> str:
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...
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def _to_str(
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x: t.Any | None,
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charset: str | None = _default_encoding,
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errors: str = "strict",
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allow_none_charset: bool = False,
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) -> str | bytes | None:
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if x is None or isinstance(x, str):
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return x
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if not isinstance(x, (bytes, bytearray)):
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return str(x)
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if charset is None:
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if allow_none_charset:
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return x
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return x.decode(charset, errors) # type: ignore
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def _wsgi_decoding_dance(
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s: str, charset: str = "utf-8", errors: str = "replace"
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) -> str:
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return s.encode("latin1").decode(charset, errors)
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def _wsgi_encoding_dance(s: str, charset: str = "utf-8", errors: str = "strict") -> str:
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return s.encode(charset).decode("latin1", errors)
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def _get_environ(obj: WSGIEnvironment | Request) -> WSGIEnvironment:
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env = getattr(obj, "environ", obj)
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assert isinstance(
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env, dict
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), f"{type(obj).__name__!r} is not a WSGI environment (has to be a dict)"
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return env
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def _has_level_handler(logger: logging.Logger) -> bool:
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"""Check if there is a handler in the logging chain that will handle
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the given logger's effective level.
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"""
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level = logger.getEffectiveLevel()
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current = logger
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while current:
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if any(handler.level <= level for handler in current.handlers):
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return True
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if not current.propagate:
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break
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current = current.parent # type: ignore
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return False
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class _ColorStreamHandler(logging.StreamHandler):
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"""On Windows, wrap stream with Colorama for ANSI style support."""
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def __init__(self) -> None:
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try:
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import colorama
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except ImportError:
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stream = None
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else:
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stream = colorama.AnsiToWin32(sys.stderr)
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super().__init__(stream)
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def _log(type: str, message: str, *args: t.Any, **kwargs: t.Any) -> None:
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"""Log a message to the 'werkzeug' logger.
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The logger is created the first time it is needed. If there is no
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level set, it is set to :data:`logging.INFO`. If there is no handler
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for the logger's effective level, a :class:`logging.StreamHandler`
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is added.
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"""
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global _logger
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if _logger is None:
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_logger = logging.getLogger("werkzeug")
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if _logger.level == logging.NOTSET:
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_logger.setLevel(logging.INFO)
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if not _has_level_handler(_logger):
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_logger.addHandler(_ColorStreamHandler())
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getattr(_logger, type)(message.rstrip(), *args, **kwargs)
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@t.overload
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def _dt_as_utc(dt: None) -> None:
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...
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@t.overload
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def _dt_as_utc(dt: datetime) -> datetime:
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...
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def _dt_as_utc(dt: datetime | None) -> datetime | None:
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if dt is None:
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return dt
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if dt.tzinfo is None:
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return dt.replace(tzinfo=timezone.utc)
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elif dt.tzinfo != timezone.utc:
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return dt.astimezone(timezone.utc)
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return dt
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_TAccessorValue = t.TypeVar("_TAccessorValue")
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class _DictAccessorProperty(t.Generic[_TAccessorValue]):
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"""Baseclass for `environ_property` and `header_property`."""
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read_only = False
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def __init__(
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self,
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name: str,
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default: _TAccessorValue | None = None,
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load_func: t.Callable[[str], _TAccessorValue] | None = None,
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dump_func: t.Callable[[_TAccessorValue], str] | None = None,
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read_only: bool | None = None,
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doc: str | None = None,
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) -> None:
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self.name = name
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self.default = default
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self.load_func = load_func
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self.dump_func = dump_func
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if read_only is not None:
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self.read_only = read_only
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self.__doc__ = doc
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def lookup(self, instance: t.Any) -> t.MutableMapping[str, t.Any]:
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raise NotImplementedError
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@t.overload
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def __get__(
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self, instance: None, owner: type
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) -> _DictAccessorProperty[_TAccessorValue]:
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...
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@t.overload
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def __get__(self, instance: t.Any, owner: type) -> _TAccessorValue:
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...
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def __get__(
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self, instance: t.Any | None, owner: type
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) -> _TAccessorValue | _DictAccessorProperty[_TAccessorValue]:
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if instance is None:
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return self
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storage = self.lookup(instance)
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if self.name not in storage:
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return self.default # type: ignore
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value = storage[self.name]
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if self.load_func is not None:
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try:
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return self.load_func(value)
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except (ValueError, TypeError):
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return self.default # type: ignore
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return value # type: ignore
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def __set__(self, instance: t.Any, value: _TAccessorValue) -> None:
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if self.read_only:
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raise AttributeError("read only property")
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if self.dump_func is not None:
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self.lookup(instance)[self.name] = self.dump_func(value)
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else:
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self.lookup(instance)[self.name] = value
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def __delete__(self, instance: t.Any) -> None:
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if self.read_only:
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raise AttributeError("read only property")
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self.lookup(instance).pop(self.name, None)
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def __repr__(self) -> str:
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return f"<{type(self).__name__} {self.name}>"
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def _decode_idna(domain: str) -> str:
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try:
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data = domain.encode("ascii")
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except UnicodeEncodeError:
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# If the domain is not ASCII, it's decoded already.
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return domain
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try:
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# Try decoding in one shot.
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return data.decode("idna")
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except UnicodeDecodeError:
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pass
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# Decode each part separately, leaving invalid parts as punycode.
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parts = []
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for part in data.split(b"."):
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try:
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parts.append(part.decode("idna"))
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except UnicodeDecodeError:
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parts.append(part.decode("ascii"))
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return ".".join(parts)
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_plain_int_re = re.compile(r"-?\d+", re.ASCII)
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_plain_float_re = re.compile(r"-?\d+\.\d+", re.ASCII)
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def _plain_int(value: str) -> int:
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"""Parse an int only if it is only ASCII digits and ``-``.
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This disallows ``+``, ``_``, and non-ASCII digits, which are accepted by ``int`` but
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are not allowed in HTTP header values.
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"""
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if _plain_int_re.fullmatch(value) is None:
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raise ValueError
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return int(value)
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def _plain_float(value: str) -> float:
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"""Parse a float only if it is only ASCII digits and ``-``, and contains digits
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before and after the ``.``.
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This disallows ``+``, ``_``, non-ASCII digits, and ``.123``, which are accepted by
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``float`` but are not allowed in HTTP header values.
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"""
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if _plain_float_re.fullmatch(value) is None:
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raise ValueError
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return float(value)
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