195 lines
7.3 KiB
Python
195 lines
7.3 KiB
Python
# Copyright 2016 Google Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""OAuth 2.0 Credentials.
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This module provides credentials based on OAuth 2.0 access and refresh tokens.
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These credentials usually access resources on behalf of a user (resource
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owner).
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Specifically, this is intended to use access tokens acquired using the
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`Authorization Code grant`_ and can refresh those tokens using a
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optional `refresh token`_.
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Obtaining the initial access and refresh token is outside of the scope of this
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module. Consult `rfc6749 section 4.1`_ for complete details on the
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Authorization Code grant flow.
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.. _Authorization Code grant: https://tools.ietf.org/html/rfc6749#section-1.3.1
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.. _refresh token: https://tools.ietf.org/html/rfc6749#section-6
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.. _rfc6749 section 4.1: https://tools.ietf.org/html/rfc6749#section-4.1
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"""
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import io
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import json
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import six
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from google.auth import _helpers
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from google.auth import credentials
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from google.auth import exceptions
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from google.oauth2 import _client
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# The Google OAuth 2.0 token endpoint. Used for authorized user credentials.
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_GOOGLE_OAUTH2_TOKEN_ENDPOINT = 'https://oauth2.googleapis.com/token'
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class Credentials(credentials.ReadOnlyScoped, credentials.Credentials):
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"""Credentials using OAuth 2.0 access and refresh tokens."""
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def __init__(self, token, refresh_token=None, id_token=None,
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token_uri=None, client_id=None, client_secret=None,
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scopes=None):
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"""
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Args:
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token (Optional(str)): The OAuth 2.0 access token. Can be None
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if refresh information is provided.
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refresh_token (str): The OAuth 2.0 refresh token. If specified,
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credentials can be refreshed.
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id_token (str): The Open ID Connect ID Token.
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token_uri (str): The OAuth 2.0 authorization server's token
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endpoint URI. Must be specified for refresh, can be left as
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None if the token can not be refreshed.
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client_id (str): The OAuth 2.0 client ID. Must be specified for
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refresh, can be left as None if the token can not be refreshed.
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client_secret(str): The OAuth 2.0 client secret. Must be specified
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for refresh, can be left as None if the token can not be
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refreshed.
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scopes (Sequence[str]): The scopes that were originally used
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to obtain authorization. This is a purely informative parameter
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that can be used by :meth:`has_scopes`. OAuth 2.0 credentials
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can not request additional scopes after authorization.
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"""
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super(Credentials, self).__init__()
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self.token = token
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self._refresh_token = refresh_token
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self._id_token = id_token
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self._scopes = scopes
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self._token_uri = token_uri
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self._client_id = client_id
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self._client_secret = client_secret
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@property
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def refresh_token(self):
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"""Optional[str]: The OAuth 2.0 refresh token."""
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return self._refresh_token
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@property
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def token_uri(self):
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"""Optional[str]: The OAuth 2.0 authorization server's token endpoint
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URI."""
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return self._token_uri
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@property
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def id_token(self):
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"""Optional[str]: The Open ID Connect ID Token.
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Depending on the authorization server and the scopes requested, this
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may be populated when credentials are obtained and updated when
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:meth:`refresh` is called. This token is a JWT. It can be verified
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and decoded using :func:`google.oauth2.id_token.verify_oauth2_token`.
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"""
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return self._id_token
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@property
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def client_id(self):
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"""Optional[str]: The OAuth 2.0 client ID."""
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return self._client_id
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@property
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def client_secret(self):
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"""Optional[str]: The OAuth 2.0 client secret."""
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return self._client_secret
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@property
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def requires_scopes(self):
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"""False: OAuth 2.0 credentials have their scopes set when
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the initial token is requested and can not be changed."""
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return False
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@_helpers.copy_docstring(credentials.Credentials)
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def refresh(self, request):
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if (self._refresh_token is None or
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self._token_uri is None or
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self._client_id is None or
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self._client_secret is None):
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raise exceptions.RefreshError(
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'The credentials do not contain the necessary fields need to '
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'refresh the access token. You must specify refresh_token, '
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'token_uri, client_id, and client_secret.')
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access_token, refresh_token, expiry, grant_response = (
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_client.refresh_grant(
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request, self._token_uri, self._refresh_token, self._client_id,
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self._client_secret))
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self.token = access_token
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self.expiry = expiry
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self._refresh_token = refresh_token
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self._id_token = grant_response.get('id_token')
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@classmethod
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def from_authorized_user_info(cls, info, scopes=None):
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"""Creates a Credentials instance from parsed authorized user info.
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Args:
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info (Mapping[str, str]): The authorized user info in Google
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format.
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scopes (Sequence[str]): Optional list of scopes to include in the
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credentials.
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Returns:
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google.oauth2.credentials.Credentials: The constructed
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credentials.
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Raises:
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ValueError: If the info is not in the expected format.
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"""
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keys_needed = set(('refresh_token', 'client_id', 'client_secret'))
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missing = keys_needed.difference(six.iterkeys(info))
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if missing:
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raise ValueError(
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'Authorized user info was not in the expected format, missing '
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'fields {}.'.format(', '.join(missing)))
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return Credentials(
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None, # No access token, must be refreshed.
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refresh_token=info['refresh_token'],
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token_uri=_GOOGLE_OAUTH2_TOKEN_ENDPOINT,
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scopes=scopes,
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client_id=info['client_id'],
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client_secret=info['client_secret'])
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@classmethod
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def from_authorized_user_file(cls, filename, scopes=None):
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"""Creates a Credentials instance from an authorized user json file.
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Args:
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filename (str): The path to the authorized user json file.
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scopes (Sequence[str]): Optional list of scopes to include in the
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credentials.
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Returns:
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google.oauth2.credentials.Credentials: The constructed
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credentials.
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Raises:
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ValueError: If the file is not in the expected format.
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"""
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with io.open(filename, 'r', encoding='utf-8') as json_file:
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data = json.load(json_file)
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return cls.from_authorized_user_info(data, scopes)
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