317 lines
9.8 KiB
Python
317 lines
9.8 KiB
Python
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from __future__ import annotations
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import base64
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import binascii
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import typing as t
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from ..http import dump_header
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from ..http import parse_dict_header
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from ..http import quote_header_value
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from .structures import CallbackDict
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if t.TYPE_CHECKING:
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import typing_extensions as te
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class Authorization:
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"""Represents the parts of an ``Authorization`` request header.
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:attr:`.Request.authorization` returns an instance if the header is set.
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An instance can be used with the test :class:`.Client` request methods' ``auth``
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parameter to send the header in test requests.
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Depending on the auth scheme, either :attr:`parameters` or :attr:`token` will be
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set. The ``Basic`` scheme's token is decoded into the ``username`` and ``password``
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parameters.
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For convenience, ``auth["key"]`` and ``auth.key`` both access the key in the
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:attr:`parameters` dict, along with ``auth.get("key")`` and ``"key" in auth``.
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.. versionchanged:: 2.3
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The ``token`` parameter and attribute was added to support auth schemes that use
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a token instead of parameters, such as ``Bearer``.
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.. versionchanged:: 2.3
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The object is no longer a ``dict``.
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.. versionchanged:: 0.5
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The object is an immutable dict.
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"""
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def __init__(
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self,
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auth_type: str,
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data: dict[str, str | None] | None = None,
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token: str | None = None,
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) -> None:
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self.type = auth_type
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"""The authorization scheme, like ``basic``, ``digest``, or ``bearer``."""
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if data is None:
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data = {}
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self.parameters = data
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"""A dict of parameters parsed from the header. Either this or :attr:`token`
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will have a value for a given scheme.
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"""
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self.token = token
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"""A token parsed from the header. Either this or :attr:`parameters` will have a
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value for a given scheme.
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.. versionadded:: 2.3
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"""
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def __getattr__(self, name: str) -> str | None:
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return self.parameters.get(name)
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def __getitem__(self, name: str) -> str | None:
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return self.parameters.get(name)
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def get(self, key: str, default: str | None = None) -> str | None:
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return self.parameters.get(key, default)
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def __contains__(self, key: str) -> bool:
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return key in self.parameters
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def __eq__(self, other: object) -> bool:
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if not isinstance(other, Authorization):
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return NotImplemented
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return (
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other.type == self.type
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and other.token == self.token
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and other.parameters == self.parameters
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)
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@classmethod
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def from_header(cls, value: str | None) -> te.Self | None:
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"""Parse an ``Authorization`` header value and return an instance, or ``None``
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if the value is empty.
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:param value: The header value to parse.
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.. versionadded:: 2.3
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"""
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if not value:
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return None
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scheme, _, rest = value.partition(" ")
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scheme = scheme.lower()
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rest = rest.strip()
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if scheme == "basic":
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try:
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username, _, password = base64.b64decode(rest).decode().partition(":")
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except (binascii.Error, UnicodeError):
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return None
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return cls(scheme, {"username": username, "password": password})
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if "=" in rest.rstrip("="):
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# = that is not trailing, this is parameters.
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return cls(scheme, parse_dict_header(rest), None)
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# No = or only trailing =, this is a token.
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return cls(scheme, None, rest)
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def to_header(self) -> str:
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"""Produce an ``Authorization`` header value representing this data.
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.. versionadded:: 2.0
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"""
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if self.type == "basic":
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value = base64.b64encode(
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f"{self.username}:{self.password}".encode()
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).decode("ascii")
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return f"Basic {value}"
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if self.token is not None:
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return f"{self.type.title()} {self.token}"
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return f"{self.type.title()} {dump_header(self.parameters)}"
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def __str__(self) -> str:
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return self.to_header()
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def __repr__(self) -> str:
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return f"<{type(self).__name__} {self.to_header()}>"
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class WWWAuthenticate:
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"""Represents the parts of a ``WWW-Authenticate`` response header.
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Set :attr:`.Response.www_authenticate` to an instance of list of instances to set
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values for this header in the response. Modifying this instance will modify the
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header value.
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Depending on the auth scheme, either :attr:`parameters` or :attr:`token` should be
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set. The ``Basic`` scheme will encode ``username`` and ``password`` parameters to a
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token.
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For convenience, ``auth["key"]`` and ``auth.key`` both act on the :attr:`parameters`
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dict, and can be used to get, set, or delete parameters. ``auth.get("key")`` and
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``"key" in auth`` are also provided.
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.. versionchanged:: 2.3
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The ``token`` parameter and attribute was added to support auth schemes that use
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a token instead of parameters, such as ``Bearer``.
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.. versionchanged:: 2.3
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The object is no longer a ``dict``.
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.. versionchanged:: 2.3
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The ``on_update`` parameter was removed.
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"""
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def __init__(
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self,
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auth_type: str,
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values: dict[str, str | None] | None = None,
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token: str | None = None,
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):
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self._type = auth_type.lower()
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self._parameters: dict[str, str | None] = CallbackDict(
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values, lambda _: self._trigger_on_update()
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)
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self._token = token
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self._on_update: t.Callable[[WWWAuthenticate], None] | None = None
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def _trigger_on_update(self) -> None:
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if self._on_update is not None:
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self._on_update(self)
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@property
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def type(self) -> str:
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"""The authorization scheme, like ``basic``, ``digest``, or ``bearer``."""
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return self._type
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@type.setter
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def type(self, value: str) -> None:
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self._type = value
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self._trigger_on_update()
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@property
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def parameters(self) -> dict[str, str | None]:
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"""A dict of parameters for the header. Only one of this or :attr:`token` should
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have a value for a given scheme.
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"""
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return self._parameters
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@parameters.setter
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def parameters(self, value: dict[str, str]) -> None:
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self._parameters = CallbackDict(value, lambda _: self._trigger_on_update())
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self._trigger_on_update()
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@property
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def token(self) -> str | None:
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"""A dict of parameters for the header. Only one of this or :attr:`token` should
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have a value for a given scheme.
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"""
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return self._token
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@token.setter
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def token(self, value: str | None) -> None:
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"""A token for the header. Only one of this or :attr:`parameters` should have a
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value for a given scheme.
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.. versionadded:: 2.3
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"""
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self._token = value
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self._trigger_on_update()
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def __getitem__(self, key: str) -> str | None:
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return self.parameters.get(key)
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def __setitem__(self, key: str, value: str | None) -> None:
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if value is None:
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if key in self.parameters:
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del self.parameters[key]
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else:
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self.parameters[key] = value
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self._trigger_on_update()
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def __delitem__(self, key: str) -> None:
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if key in self.parameters:
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del self.parameters[key]
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self._trigger_on_update()
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def __getattr__(self, name: str) -> str | None:
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return self[name]
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def __setattr__(self, name: str, value: str | None) -> None:
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if name in {"_type", "_parameters", "_token", "_on_update"}:
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super().__setattr__(name, value)
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else:
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self[name] = value
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def __delattr__(self, name: str) -> None:
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del self[name]
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def __contains__(self, key: str) -> bool:
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return key in self.parameters
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def __eq__(self, other: object) -> bool:
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if not isinstance(other, WWWAuthenticate):
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return NotImplemented
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return (
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other.type == self.type
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and other.token == self.token
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and other.parameters == self.parameters
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)
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def get(self, key: str, default: str | None = None) -> str | None:
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return self.parameters.get(key, default)
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@classmethod
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def from_header(cls, value: str | None) -> te.Self | None:
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"""Parse a ``WWW-Authenticate`` header value and return an instance, or ``None``
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if the value is empty.
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:param value: The header value to parse.
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.. versionadded:: 2.3
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"""
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if not value:
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return None
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scheme, _, rest = value.partition(" ")
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scheme = scheme.lower()
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rest = rest.strip()
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if "=" in rest.rstrip("="):
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# = that is not trailing, this is parameters.
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return cls(scheme, parse_dict_header(rest), None)
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# No = or only trailing =, this is a token.
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return cls(scheme, None, rest)
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def to_header(self) -> str:
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"""Produce a ``WWW-Authenticate`` header value representing this data."""
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if self.token is not None:
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return f"{self.type.title()} {self.token}"
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if self.type == "digest":
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items = []
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for key, value in self.parameters.items():
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if key in {"realm", "domain", "nonce", "opaque", "qop"}:
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value = quote_header_value(value, allow_token=False)
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else:
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value = quote_header_value(value)
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items.append(f"{key}={value}")
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return f"Digest {', '.join(items)}"
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return f"{self.type.title()} {dump_header(self.parameters)}"
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def __str__(self) -> str:
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return self.to_header()
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def __repr__(self) -> str:
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return f"<{type(self).__name__} {self.to_header()}>"
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