File size: 5,545 Bytes
47b2311
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
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)