Replace custom blob gRPC API with ByteStream

client/third_party/google/auth/transport/requests.py

+# Copyright 2016 Google Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Transport adapter for Requests."""
+
+from __future__ import absolute_import
+
+import logging
+
+try:
+    import requests
+except ImportError:  # pragma: NO COVER
+    raise ImportError(
+        'The requests library is not installed, please install the requests '
+        'package to use the requests transport.')
+import requests.exceptions
+
+from google.auth import exceptions
+from google.auth import transport
+
+_LOGGER = logging.getLogger(__name__)
+
+
+class _Response(transport.Response):
+    """Requests transport response adapter.
+
+    Args:
+        response (requests.Response): The raw Requests response.
+    """
+    def __init__(self, response):
+        self._response = response
+
+    @property
+    def status(self):
+        return self._response.status_code
+
+    @property
+    def headers(self):
+        return self._response.headers
+
+    @property
+    def data(self):
+        return self._response.content
+
+
+class Request(transport.Request):
+    """Requests request adapter.
+
+    This class is used internally for making requests using various transports
+    in a consistent way. If you use :class:`AuthorizedSession` you do not need
+    to construct or use this class directly.
+
+    This class can be useful if you want to manually refresh a
+    :class:`~google.auth.credentials.Credentials` instance::
+
+        import google.auth.transport.requests
+        import requests
+
+        request = google.auth.transport.requests.Request()
+
+        credentials.refresh(request)
+
+    Args:
+        session (requests.Session): An instance :class:`requests.Session` used
+            to make HTTP requests. If not specified, a session will be created.
+
+    .. automethod:: __call__
+    """
+    def __init__(self, session=None):
+        if not session:
+            session = requests.Session()
+
+        self.session = session
+
+    def __call__(self, url, method='GET', body=None, headers=None,
+                 timeout=None, **kwargs):
+        """Make an HTTP request using requests.
+
+        Args:
+            url (str): The URI to be requested.
+            method (str): The HTTP method to use for the request. Defaults
+                to 'GET'.
+            body (bytes): The payload / body in HTTP request.
+            headers (Mapping[str, str]): Request headers.
+            timeout (Optional[int]): The number of seconds to wait for a
+                response from the server. If not specified or if None, the
+                requests default timeout will be used.
+            kwargs: Additional arguments passed through to the underlying
+                requests :meth:`~requests.Session.request` method.
+
+        Returns:
+            google.auth.transport.Response: The HTTP response.
+
+        Raises:
+            google.auth.exceptions.TransportError: If any exception occurred.
+        """
+        try:
+            _LOGGER.debug('Making request: %s %s', method, url)
+            response = self.session.request(
+                method, url, data=body, headers=headers, timeout=timeout,
+                **kwargs)
+            return _Response(response)
+        except requests.exceptions.RequestException as exc:
+            raise exceptions.TransportError(exc)
+
+
+class AuthorizedSession(requests.Session):
+    """A Requests Session class with credentials.
+
+    This class is used to perform requests to API endpoints that require
+    authorization::
+
+        from google.auth.transport.requests import AuthorizedSession
+
+        authed_session = AuthorizedSession(credentials)
+
+        response = authed_session.request(
+            'GET', 'https://www.googleapis.com/storage/v1/b')
+
+    The underlying :meth:`request` implementation handles adding the
+    credentials' headers to the request and refreshing credentials as needed.
+
+    Args:
+        credentials (google.auth.credentials.Credentials): The credentials to
+            add to the request.
+        refresh_status_codes (Sequence[int]): Which HTTP status codes indicate
+            that credentials should be refreshed and the request should be
+            retried.
+        max_refresh_attempts (int): The maximum number of times to attempt to
+            refresh the credentials and retry the request.
+        kwargs: Additional arguments passed to the :class:`requests.Session`
+            constructor.
+    """
+    def __init__(self, credentials,
+                 refresh_status_codes=transport.DEFAULT_REFRESH_STATUS_CODES,
+                 max_refresh_attempts=transport.DEFAULT_MAX_REFRESH_ATTEMPTS,
+                 **kwargs):
+        super(AuthorizedSession, self).__init__(**kwargs)
+        self.credentials = credentials
+        self._refresh_status_codes = refresh_status_codes
+        self._max_refresh_attempts = max_refresh_attempts
+        # Request instance used by internal methods (for example,
+        # credentials.refresh).
+        # Do not pass `self` as the session here, as it can lead to infinite
+        # recursion.
+        self._auth_request = Request()
+
+    def request(self, method, url, data=None, headers=None, **kwargs):
+        """Implementation of Requests' request."""
+        # pylint: disable=arguments-differ
+        # Requests has a ton of arguments to request, but only two
+        # (method, url) are required. We pass through all of the other
+        # arguments to super, so no need to exhaustively list them here.
+
+        # Use a kwarg for this instead of an attribute to maintain
+        # thread-safety.
+        _credential_refresh_attempt = kwargs.pop(
+            '_credential_refresh_attempt', 0)
+
+        # Make a copy of the headers. They will be modified by the credentials
+        # and we want to pass the original headers if we recurse.
+        request_headers = headers.copy() if headers is not None else {}
+
+        self.credentials.before_request(
+            self._auth_request, method, url, request_headers)
+
+        response = super(AuthorizedSession, self).request(
+            method, url, data=data, headers=request_headers, **kwargs)
+
+        # If the response indicated that the credentials needed to be
+        # refreshed, then refresh the credentials and re-attempt the
+        # request.
+        # A stored token may expire between the time it is retrieved and
+        # the time the request is made, so we may need to try twice.
+        if (response.status_code in self._refresh_status_codes
+                and _credential_refresh_attempt < self._max_refresh_attempts):
+
+            _LOGGER.info(
+                'Refreshing credentials due to a %s response. Attempt %s/%s.',
+                response.status_code, _credential_refresh_attempt + 1,
+                self._max_refresh_attempts)
+
+            self.credentials.refresh(self._auth_request)
+
+            # Recurse. Pass in the original headers, not our modified set.
+            return self.request(
+                method, url, data=data, headers=headers,
+                _credential_refresh_attempt=_credential_refresh_attempt + 1,
+                **kwargs)
+
+        return response