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# Copyright 2015 Google Inc. All Rights Reserved.
#
# 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.
"""OAuth 2.0 utitilies for Google Developer Shell environment."""
import datetime
import json
import os
import socket
from oauth2client import _helpers
from oauth2client import client
DEVSHELL_ENV = 'DEVSHELL_CLIENT_PORT'
class Error(Exception):
"""Errors for this module."""
pass
class CommunicationError(Error):
"""Errors for communication with the Developer Shell server."""
class NoDevshellServer(Error):
"""Error when no Developer Shell server can be contacted."""
# The request for credential information to the Developer Shell client socket
# is always an empty PBLite-formatted JSON object, so just define it as a
# constant.
CREDENTIAL_INFO_REQUEST_JSON = '[]'
class CredentialInfoResponse(object):
"""Credential information response from Developer Shell server.
The credential information response from Developer Shell socket is a
PBLite-formatted JSON array with fields encoded by their index in the
array:
* Index 0 - user email
* Index 1 - default project ID. None if the project context is not known.
* Index 2 - OAuth2 access token. None if there is no valid auth context.
* Index 3 - Seconds until the access token expires. None if not present.
"""
def __init__(self, json_string):
"""Initialize the response data from JSON PBLite array."""
pbl = json.loads(json_string)
if not isinstance(pbl, list):
raise ValueError('Not a list: ' + str(pbl))
pbl_len = len(pbl)
self.user_email = pbl[0] if pbl_len > 0 else None
self.project_id = pbl[1] if pbl_len > 1 else None
self.access_token = pbl[2] if pbl_len > 2 else None
self.expires_in = pbl[3] if pbl_len > 3 else None
def _SendRecv():
"""Communicate with the Developer Shell server socket."""
port = int(os.getenv(DEVSHELL_ENV, 0))
if port == 0:
raise NoDevshellServer()
sock = socket.socket()
sock.connect(('localhost', port))
data = CREDENTIAL_INFO_REQUEST_JSON
msg = '{0}\n{1}'.format(len(data), data)
sock.sendall(_helpers._to_bytes(msg, encoding='utf-8'))
header = sock.recv(6).decode()
if '\n' not in header:
raise CommunicationError('saw no newline in the first 6 bytes')
len_str, json_str = header.split('\n', 1)
to_read = int(len_str) - len(json_str)
if to_read > 0:
json_str += sock.recv(to_read, socket.MSG_WAITALL).decode()
return CredentialInfoResponse(json_str)
class DevshellCredentials(client.GoogleCredentials):
"""Credentials object for Google Developer Shell environment.
This object will allow a Google Developer Shell session to identify its
user to Google and other OAuth 2.0 servers that can verify assertions. It
can be used for the purpose of accessing data stored under the user
account.
This credential does not require a flow to instantiate because it
represents a two legged flow, and therefore has all of the required
information to generate and refresh its own access tokens.
"""
def __init__(self, user_agent=None):
super(DevshellCredentials, self).__init__(
None, # access_token, initialized below
None, # client_id
None, # client_secret
None, # refresh_token
None, # token_expiry
None, # token_uri
user_agent)
self._refresh(None)
def _refresh(self, http_request):
self.devshell_response = _SendRecv()
self.access_token = self.devshell_response.access_token
expires_in = self.devshell_response.expires_in
if expires_in is not None:
delta = datetime.timedelta(seconds=expires_in)
self.token_expiry = client._UTCNOW() + delta
else:
self.token_expiry = None
@property
def user_email(self):
return self.devshell_response.user_email
@property
def project_id(self):
return self.devshell_response.project_id
@classmethod
def from_json(cls, json_data):
raise NotImplementedError(
'Cannot load Developer Shell credentials from JSON.')
@property
def serialization_data(self):
raise NotImplementedError(
'Cannot serialize Developer Shell credentials.')
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