913 lines
33 KiB
Python
913 lines
33 KiB
Python
# Copyright 2014 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.
|
|
|
|
"""Utilities for Google App Engine
|
|
|
|
Utilities for making it easier to use OAuth 2.0 on Google App Engine.
|
|
"""
|
|
|
|
import cgi
|
|
import json
|
|
import logging
|
|
import os
|
|
import pickle
|
|
import threading
|
|
|
|
from google.appengine.api import app_identity
|
|
from google.appengine.api import memcache
|
|
from google.appengine.api import users
|
|
from google.appengine.ext import db
|
|
from google.appengine.ext.webapp.util import login_required
|
|
import httplib2
|
|
import webapp2 as webapp
|
|
|
|
import oauth2client
|
|
from oauth2client import client
|
|
from oauth2client import clientsecrets
|
|
from oauth2client import util
|
|
from oauth2client.contrib import xsrfutil
|
|
|
|
# This is a temporary fix for a Google internal issue.
|
|
try:
|
|
from oauth2client.contrib import _appengine_ndb
|
|
except ImportError: # pragma: NO COVER
|
|
_appengine_ndb = None
|
|
|
|
|
|
__author__ = 'jcgregorio@google.com (Joe Gregorio)'
|
|
|
|
logger = logging.getLogger(__name__)
|
|
|
|
OAUTH2CLIENT_NAMESPACE = 'oauth2client#ns'
|
|
|
|
XSRF_MEMCACHE_ID = 'xsrf_secret_key'
|
|
|
|
if _appengine_ndb is None: # pragma: NO COVER
|
|
CredentialsNDBModel = None
|
|
CredentialsNDBProperty = None
|
|
FlowNDBProperty = None
|
|
_NDB_KEY = None
|
|
_NDB_MODEL = None
|
|
SiteXsrfSecretKeyNDB = None
|
|
else:
|
|
CredentialsNDBModel = _appengine_ndb.CredentialsNDBModel
|
|
CredentialsNDBProperty = _appengine_ndb.CredentialsNDBProperty
|
|
FlowNDBProperty = _appengine_ndb.FlowNDBProperty
|
|
_NDB_KEY = _appengine_ndb.NDB_KEY
|
|
_NDB_MODEL = _appengine_ndb.NDB_MODEL
|
|
SiteXsrfSecretKeyNDB = _appengine_ndb.SiteXsrfSecretKeyNDB
|
|
|
|
|
|
def _safe_html(s):
|
|
"""Escape text to make it safe to display.
|
|
|
|
Args:
|
|
s: string, The text to escape.
|
|
|
|
Returns:
|
|
The escaped text as a string.
|
|
"""
|
|
return cgi.escape(s, quote=1).replace("'", ''')
|
|
|
|
|
|
class SiteXsrfSecretKey(db.Model):
|
|
"""Storage for the sites XSRF secret key.
|
|
|
|
There will only be one instance stored of this model, the one used for the
|
|
site.
|
|
"""
|
|
secret = db.StringProperty()
|
|
|
|
|
|
def _generate_new_xsrf_secret_key():
|
|
"""Returns a random XSRF secret key."""
|
|
return os.urandom(16).encode("hex")
|
|
|
|
|
|
def xsrf_secret_key():
|
|
"""Return the secret key for use for XSRF protection.
|
|
|
|
If the Site entity does not have a secret key, this method will also create
|
|
one and persist it.
|
|
|
|
Returns:
|
|
The secret key.
|
|
"""
|
|
secret = memcache.get(XSRF_MEMCACHE_ID, namespace=OAUTH2CLIENT_NAMESPACE)
|
|
if not secret:
|
|
# Load the one and only instance of SiteXsrfSecretKey.
|
|
model = SiteXsrfSecretKey.get_or_insert(key_name='site')
|
|
if not model.secret:
|
|
model.secret = _generate_new_xsrf_secret_key()
|
|
model.put()
|
|
secret = model.secret
|
|
memcache.add(XSRF_MEMCACHE_ID, secret,
|
|
namespace=OAUTH2CLIENT_NAMESPACE)
|
|
|
|
return str(secret)
|
|
|
|
|
|
class AppAssertionCredentials(client.AssertionCredentials):
|
|
"""Credentials object for App Engine Assertion Grants
|
|
|
|
This object will allow an App Engine application to identify itself to
|
|
Google and other OAuth 2.0 servers that can verify assertions. It can be
|
|
used for the purpose of accessing data stored under an account assigned to
|
|
the App Engine application itself.
|
|
|
|
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.
|
|
"""
|
|
|
|
@util.positional(2)
|
|
def __init__(self, scope, **kwargs):
|
|
"""Constructor for AppAssertionCredentials
|
|
|
|
Args:
|
|
scope: string or iterable of strings, scope(s) of the credentials
|
|
being requested.
|
|
**kwargs: optional keyword args, including:
|
|
service_account_id: service account id of the application. If None
|
|
or unspecified, the default service account for
|
|
the app is used.
|
|
"""
|
|
self.scope = util.scopes_to_string(scope)
|
|
self._kwargs = kwargs
|
|
self.service_account_id = kwargs.get('service_account_id', None)
|
|
self._service_account_email = None
|
|
|
|
# Assertion type is no longer used, but still in the
|
|
# parent class signature.
|
|
super(AppAssertionCredentials, self).__init__(None)
|
|
|
|
@classmethod
|
|
def from_json(cls, json_data):
|
|
data = json.loads(json_data)
|
|
return AppAssertionCredentials(data['scope'])
|
|
|
|
def _refresh(self, http_request):
|
|
"""Refreshes the access_token.
|
|
|
|
Since the underlying App Engine app_identity implementation does its
|
|
own caching we can skip all the storage hoops and just to a refresh
|
|
using the API.
|
|
|
|
Args:
|
|
http_request: callable, a callable that matches the method
|
|
signature of httplib2.Http.request, used to make the
|
|
refresh request.
|
|
|
|
Raises:
|
|
AccessTokenRefreshError: When the refresh fails.
|
|
"""
|
|
try:
|
|
scopes = self.scope.split()
|
|
(token, _) = app_identity.get_access_token(
|
|
scopes, service_account_id=self.service_account_id)
|
|
except app_identity.Error as e:
|
|
raise client.AccessTokenRefreshError(str(e))
|
|
self.access_token = token
|
|
|
|
@property
|
|
def serialization_data(self):
|
|
raise NotImplementedError('Cannot serialize credentials '
|
|
'for Google App Engine.')
|
|
|
|
def create_scoped_required(self):
|
|
return not self.scope
|
|
|
|
def create_scoped(self, scopes):
|
|
return AppAssertionCredentials(scopes, **self._kwargs)
|
|
|
|
def sign_blob(self, blob):
|
|
"""Cryptographically sign a blob (of bytes).
|
|
|
|
Implements abstract method
|
|
:meth:`oauth2client.client.AssertionCredentials.sign_blob`.
|
|
|
|
Args:
|
|
blob: bytes, Message to be signed.
|
|
|
|
Returns:
|
|
tuple, A pair of the private key ID used to sign the blob and
|
|
the signed contents.
|
|
"""
|
|
return app_identity.sign_blob(blob)
|
|
|
|
@property
|
|
def service_account_email(self):
|
|
"""Get the email for the current service account.
|
|
|
|
Returns:
|
|
string, The email associated with the Google App Engine
|
|
service account.
|
|
"""
|
|
if self._service_account_email is None:
|
|
self._service_account_email = (
|
|
app_identity.get_service_account_name())
|
|
return self._service_account_email
|
|
|
|
|
|
class FlowProperty(db.Property):
|
|
"""App Engine datastore Property for Flow.
|
|
|
|
Utility property that allows easy storage and retrieval of an
|
|
oauth2client.Flow
|
|
"""
|
|
|
|
# Tell what the user type is.
|
|
data_type = client.Flow
|
|
|
|
# For writing to datastore.
|
|
def get_value_for_datastore(self, model_instance):
|
|
flow = super(FlowProperty, self).get_value_for_datastore(
|
|
model_instance)
|
|
return db.Blob(pickle.dumps(flow))
|
|
|
|
# For reading from datastore.
|
|
def make_value_from_datastore(self, value):
|
|
if value is None:
|
|
return None
|
|
return pickle.loads(value)
|
|
|
|
def validate(self, value):
|
|
if value is not None and not isinstance(value, client.Flow):
|
|
raise db.BadValueError(
|
|
'Property {0} must be convertible '
|
|
'to a FlowThreeLegged instance ({1})'.format(self.name, value))
|
|
return super(FlowProperty, self).validate(value)
|
|
|
|
def empty(self, value):
|
|
return not value
|
|
|
|
|
|
class CredentialsProperty(db.Property):
|
|
"""App Engine datastore Property for Credentials.
|
|
|
|
Utility property that allows easy storage and retrieval of
|
|
oauth2client.Credentials
|
|
"""
|
|
|
|
# Tell what the user type is.
|
|
data_type = client.Credentials
|
|
|
|
# For writing to datastore.
|
|
def get_value_for_datastore(self, model_instance):
|
|
logger.info("get: Got type " + str(type(model_instance)))
|
|
cred = super(CredentialsProperty, self).get_value_for_datastore(
|
|
model_instance)
|
|
if cred is None:
|
|
cred = ''
|
|
else:
|
|
cred = cred.to_json()
|
|
return db.Blob(cred)
|
|
|
|
# For reading from datastore.
|
|
def make_value_from_datastore(self, value):
|
|
logger.info("make: Got type " + str(type(value)))
|
|
if value is None:
|
|
return None
|
|
if len(value) == 0:
|
|
return None
|
|
try:
|
|
credentials = client.Credentials.new_from_json(value)
|
|
except ValueError:
|
|
credentials = None
|
|
return credentials
|
|
|
|
def validate(self, value):
|
|
value = super(CredentialsProperty, self).validate(value)
|
|
logger.info("validate: Got type " + str(type(value)))
|
|
if value is not None and not isinstance(value, client.Credentials):
|
|
raise db.BadValueError(
|
|
'Property {0} must be convertible '
|
|
'to a Credentials instance ({1})'.format(self.name, value))
|
|
return value
|
|
|
|
|
|
class StorageByKeyName(client.Storage):
|
|
"""Store and retrieve a credential to and from the App Engine datastore.
|
|
|
|
This Storage helper presumes the Credentials have been stored as a
|
|
CredentialsProperty or CredentialsNDBProperty on a datastore model class,
|
|
and that entities are stored by key_name.
|
|
"""
|
|
|
|
@util.positional(4)
|
|
def __init__(self, model, key_name, property_name, cache=None, user=None):
|
|
"""Constructor for Storage.
|
|
|
|
Args:
|
|
model: db.Model or ndb.Model, model class
|
|
key_name: string, key name for the entity that has the credentials
|
|
property_name: string, name of the property that is a
|
|
CredentialsProperty or CredentialsNDBProperty.
|
|
cache: memcache, a write-through cache to put in front of the
|
|
datastore. If the model you are using is an NDB model, using
|
|
a cache will be redundant since the model uses an instance
|
|
cache and memcache for you.
|
|
user: users.User object, optional. Can be used to grab user ID as a
|
|
key_name if no key name is specified.
|
|
"""
|
|
super(StorageByKeyName, self).__init__()
|
|
|
|
if key_name is None:
|
|
if user is None:
|
|
raise ValueError('StorageByKeyName called with no '
|
|
'key name or user.')
|
|
key_name = user.user_id()
|
|
|
|
self._model = model
|
|
self._key_name = key_name
|
|
self._property_name = property_name
|
|
self._cache = cache
|
|
|
|
def _is_ndb(self):
|
|
"""Determine whether the model of the instance is an NDB model.
|
|
|
|
Returns:
|
|
Boolean indicating whether or not the model is an NDB or DB model.
|
|
"""
|
|
# issubclass will fail if one of the arguments is not a class, only
|
|
# need worry about new-style classes since ndb and db models are
|
|
# new-style
|
|
if isinstance(self._model, type):
|
|
if _NDB_MODEL is not None and issubclass(self._model, _NDB_MODEL):
|
|
return True
|
|
elif issubclass(self._model, db.Model):
|
|
return False
|
|
|
|
raise TypeError(
|
|
'Model class not an NDB or DB model: {0}.'.format(self._model))
|
|
|
|
def _get_entity(self):
|
|
"""Retrieve entity from datastore.
|
|
|
|
Uses a different model method for db or ndb models.
|
|
|
|
Returns:
|
|
Instance of the model corresponding to the current storage object
|
|
and stored using the key name of the storage object.
|
|
"""
|
|
if self._is_ndb():
|
|
return self._model.get_by_id(self._key_name)
|
|
else:
|
|
return self._model.get_by_key_name(self._key_name)
|
|
|
|
def _delete_entity(self):
|
|
"""Delete entity from datastore.
|
|
|
|
Attempts to delete using the key_name stored on the object, whether or
|
|
not the given key is in the datastore.
|
|
"""
|
|
if self._is_ndb():
|
|
_NDB_KEY(self._model, self._key_name).delete()
|
|
else:
|
|
entity_key = db.Key.from_path(self._model.kind(), self._key_name)
|
|
db.delete(entity_key)
|
|
|
|
@db.non_transactional(allow_existing=True)
|
|
def locked_get(self):
|
|
"""Retrieve Credential from datastore.
|
|
|
|
Returns:
|
|
oauth2client.Credentials
|
|
"""
|
|
credentials = None
|
|
if self._cache:
|
|
json = self._cache.get(self._key_name)
|
|
if json:
|
|
credentials = client.Credentials.new_from_json(json)
|
|
if credentials is None:
|
|
entity = self._get_entity()
|
|
if entity is not None:
|
|
credentials = getattr(entity, self._property_name)
|
|
if self._cache:
|
|
self._cache.set(self._key_name, credentials.to_json())
|
|
|
|
if credentials and hasattr(credentials, 'set_store'):
|
|
credentials.set_store(self)
|
|
return credentials
|
|
|
|
@db.non_transactional(allow_existing=True)
|
|
def locked_put(self, credentials):
|
|
"""Write a Credentials to the datastore.
|
|
|
|
Args:
|
|
credentials: Credentials, the credentials to store.
|
|
"""
|
|
entity = self._model.get_or_insert(self._key_name)
|
|
setattr(entity, self._property_name, credentials)
|
|
entity.put()
|
|
if self._cache:
|
|
self._cache.set(self._key_name, credentials.to_json())
|
|
|
|
@db.non_transactional(allow_existing=True)
|
|
def locked_delete(self):
|
|
"""Delete Credential from datastore."""
|
|
|
|
if self._cache:
|
|
self._cache.delete(self._key_name)
|
|
|
|
self._delete_entity()
|
|
|
|
|
|
class CredentialsModel(db.Model):
|
|
"""Storage for OAuth 2.0 Credentials
|
|
|
|
Storage of the model is keyed by the user.user_id().
|
|
"""
|
|
credentials = CredentialsProperty()
|
|
|
|
|
|
def _build_state_value(request_handler, user):
|
|
"""Composes the value for the 'state' parameter.
|
|
|
|
Packs the current request URI and an XSRF token into an opaque string that
|
|
can be passed to the authentication server via the 'state' parameter.
|
|
|
|
Args:
|
|
request_handler: webapp.RequestHandler, The request.
|
|
user: google.appengine.api.users.User, The current user.
|
|
|
|
Returns:
|
|
The state value as a string.
|
|
"""
|
|
uri = request_handler.request.url
|
|
token = xsrfutil.generate_token(xsrf_secret_key(), user.user_id(),
|
|
action_id=str(uri))
|
|
return uri + ':' + token
|
|
|
|
|
|
def _parse_state_value(state, user):
|
|
"""Parse the value of the 'state' parameter.
|
|
|
|
Parses the value and validates the XSRF token in the state parameter.
|
|
|
|
Args:
|
|
state: string, The value of the state parameter.
|
|
user: google.appengine.api.users.User, The current user.
|
|
|
|
Returns:
|
|
The redirect URI, or None if XSRF token is not valid.
|
|
"""
|
|
uri, token = state.rsplit(':', 1)
|
|
if xsrfutil.validate_token(xsrf_secret_key(), token, user.user_id(),
|
|
action_id=uri):
|
|
return uri
|
|
else:
|
|
return None
|
|
|
|
|
|
class OAuth2Decorator(object):
|
|
"""Utility for making OAuth 2.0 easier.
|
|
|
|
Instantiate and then use with oauth_required or oauth_aware
|
|
as decorators on webapp.RequestHandler methods.
|
|
|
|
::
|
|
|
|
decorator = OAuth2Decorator(
|
|
client_id='837...ent.com',
|
|
client_secret='Qh...wwI',
|
|
scope='https://www.googleapis.com/auth/plus')
|
|
|
|
class MainHandler(webapp.RequestHandler):
|
|
@decorator.oauth_required
|
|
def get(self):
|
|
http = decorator.http()
|
|
# http is authorized with the user's Credentials and can be
|
|
# used in API calls
|
|
|
|
"""
|
|
|
|
def set_credentials(self, credentials):
|
|
self._tls.credentials = credentials
|
|
|
|
def get_credentials(self):
|
|
"""A thread local Credentials object.
|
|
|
|
Returns:
|
|
A client.Credentials object, or None if credentials hasn't been set
|
|
in this thread yet, which may happen when calling has_credentials
|
|
inside oauth_aware.
|
|
"""
|
|
return getattr(self._tls, 'credentials', None)
|
|
|
|
credentials = property(get_credentials, set_credentials)
|
|
|
|
def set_flow(self, flow):
|
|
self._tls.flow = flow
|
|
|
|
def get_flow(self):
|
|
"""A thread local Flow object.
|
|
|
|
Returns:
|
|
A credentials.Flow object, or None if the flow hasn't been set in
|
|
this thread yet, which happens in _create_flow() since Flows are
|
|
created lazily.
|
|
"""
|
|
return getattr(self._tls, 'flow', None)
|
|
|
|
flow = property(get_flow, set_flow)
|
|
|
|
@util.positional(4)
|
|
def __init__(self, client_id, client_secret, scope,
|
|
auth_uri=oauth2client.GOOGLE_AUTH_URI,
|
|
token_uri=oauth2client.GOOGLE_TOKEN_URI,
|
|
revoke_uri=oauth2client.GOOGLE_REVOKE_URI,
|
|
user_agent=None,
|
|
message=None,
|
|
callback_path='/oauth2callback',
|
|
token_response_param=None,
|
|
_storage_class=StorageByKeyName,
|
|
_credentials_class=CredentialsModel,
|
|
_credentials_property_name='credentials',
|
|
**kwargs):
|
|
"""Constructor for OAuth2Decorator
|
|
|
|
Args:
|
|
client_id: string, client identifier.
|
|
client_secret: string client secret.
|
|
scope: string or iterable of strings, scope(s) of the credentials
|
|
being requested.
|
|
auth_uri: string, URI for authorization endpoint. For convenience
|
|
defaults to Google's endpoints but any OAuth 2.0 provider
|
|
can be used.
|
|
token_uri: string, URI for token endpoint. For convenience defaults
|
|
to Google's endpoints but any OAuth 2.0 provider can be
|
|
used.
|
|
revoke_uri: string, URI for revoke endpoint. For convenience
|
|
defaults to Google's endpoints but any OAuth 2.0
|
|
provider can be used.
|
|
user_agent: string, User agent of your application, default to
|
|
None.
|
|
message: Message to display if there are problems with the
|
|
OAuth 2.0 configuration. The message may contain HTML and
|
|
will be presented on the web interface for any method that
|
|
uses the decorator.
|
|
callback_path: string, The absolute path to use as the callback
|
|
URI. Note that this must match up with the URI given
|
|
when registering the application in the APIs
|
|
Console.
|
|
token_response_param: string. If provided, the full JSON response
|
|
to the access token request will be encoded
|
|
and included in this query parameter in the
|
|
callback URI. This is useful with providers
|
|
(e.g. wordpress.com) that include extra
|
|
fields that the client may want.
|
|
_storage_class: "Protected" keyword argument not typically provided
|
|
to this constructor. A storage class to aid in
|
|
storing a Credentials object for a user in the
|
|
datastore. Defaults to StorageByKeyName.
|
|
_credentials_class: "Protected" keyword argument not typically
|
|
provided to this constructor. A db or ndb Model
|
|
class to hold credentials. Defaults to
|
|
CredentialsModel.
|
|
_credentials_property_name: "Protected" keyword argument not
|
|
typically provided to this constructor.
|
|
A string indicating the name of the
|
|
field on the _credentials_class where a
|
|
Credentials object will be stored.
|
|
Defaults to 'credentials'.
|
|
**kwargs: dict, Keyword arguments are passed along as kwargs to
|
|
the OAuth2WebServerFlow constructor.
|
|
"""
|
|
self._tls = threading.local()
|
|
self.flow = None
|
|
self.credentials = None
|
|
self._client_id = client_id
|
|
self._client_secret = client_secret
|
|
self._scope = util.scopes_to_string(scope)
|
|
self._auth_uri = auth_uri
|
|
self._token_uri = token_uri
|
|
self._revoke_uri = revoke_uri
|
|
self._user_agent = user_agent
|
|
self._kwargs = kwargs
|
|
self._message = message
|
|
self._in_error = False
|
|
self._callback_path = callback_path
|
|
self._token_response_param = token_response_param
|
|
self._storage_class = _storage_class
|
|
self._credentials_class = _credentials_class
|
|
self._credentials_property_name = _credentials_property_name
|
|
|
|
def _display_error_message(self, request_handler):
|
|
request_handler.response.out.write('<html><body>')
|
|
request_handler.response.out.write(_safe_html(self._message))
|
|
request_handler.response.out.write('</body></html>')
|
|
|
|
def oauth_required(self, method):
|
|
"""Decorator that starts the OAuth 2.0 dance.
|
|
|
|
Starts the OAuth dance for the logged in user if they haven't already
|
|
granted access for this application.
|
|
|
|
Args:
|
|
method: callable, to be decorated method of a webapp.RequestHandler
|
|
instance.
|
|
"""
|
|
|
|
def check_oauth(request_handler, *args, **kwargs):
|
|
if self._in_error:
|
|
self._display_error_message(request_handler)
|
|
return
|
|
|
|
user = users.get_current_user()
|
|
# Don't use @login_decorator as this could be used in a
|
|
# POST request.
|
|
if not user:
|
|
request_handler.redirect(users.create_login_url(
|
|
request_handler.request.uri))
|
|
return
|
|
|
|
self._create_flow(request_handler)
|
|
|
|
# Store the request URI in 'state' so we can use it later
|
|
self.flow.params['state'] = _build_state_value(
|
|
request_handler, user)
|
|
self.credentials = self._storage_class(
|
|
self._credentials_class, None,
|
|
self._credentials_property_name, user=user).get()
|
|
|
|
if not self.has_credentials():
|
|
return request_handler.redirect(self.authorize_url())
|
|
try:
|
|
resp = method(request_handler, *args, **kwargs)
|
|
except client.AccessTokenRefreshError:
|
|
return request_handler.redirect(self.authorize_url())
|
|
finally:
|
|
self.credentials = None
|
|
return resp
|
|
|
|
return check_oauth
|
|
|
|
def _create_flow(self, request_handler):
|
|
"""Create the Flow object.
|
|
|
|
The Flow is calculated lazily since we don't know where this app is
|
|
running until it receives a request, at which point redirect_uri can be
|
|
calculated and then the Flow object can be constructed.
|
|
|
|
Args:
|
|
request_handler: webapp.RequestHandler, the request handler.
|
|
"""
|
|
if self.flow is None:
|
|
redirect_uri = request_handler.request.relative_url(
|
|
self._callback_path) # Usually /oauth2callback
|
|
self.flow = client.OAuth2WebServerFlow(
|
|
self._client_id, self._client_secret, self._scope,
|
|
redirect_uri=redirect_uri, user_agent=self._user_agent,
|
|
auth_uri=self._auth_uri, token_uri=self._token_uri,
|
|
revoke_uri=self._revoke_uri, **self._kwargs)
|
|
|
|
def oauth_aware(self, method):
|
|
"""Decorator that sets up for OAuth 2.0 dance, but doesn't do it.
|
|
|
|
Does all the setup for the OAuth dance, but doesn't initiate it.
|
|
This decorator is useful if you want to create a page that knows
|
|
whether or not the user has granted access to this application.
|
|
From within a method decorated with @oauth_aware the has_credentials()
|
|
and authorize_url() methods can be called.
|
|
|
|
Args:
|
|
method: callable, to be decorated method of a webapp.RequestHandler
|
|
instance.
|
|
"""
|
|
|
|
def setup_oauth(request_handler, *args, **kwargs):
|
|
if self._in_error:
|
|
self._display_error_message(request_handler)
|
|
return
|
|
|
|
user = users.get_current_user()
|
|
# Don't use @login_decorator as this could be used in a
|
|
# POST request.
|
|
if not user:
|
|
request_handler.redirect(users.create_login_url(
|
|
request_handler.request.uri))
|
|
return
|
|
|
|
self._create_flow(request_handler)
|
|
|
|
self.flow.params['state'] = _build_state_value(request_handler,
|
|
user)
|
|
self.credentials = self._storage_class(
|
|
self._credentials_class, None,
|
|
self._credentials_property_name, user=user).get()
|
|
try:
|
|
resp = method(request_handler, *args, **kwargs)
|
|
finally:
|
|
self.credentials = None
|
|
return resp
|
|
return setup_oauth
|
|
|
|
def has_credentials(self):
|
|
"""True if for the logged in user there are valid access Credentials.
|
|
|
|
Must only be called from with a webapp.RequestHandler subclassed method
|
|
that had been decorated with either @oauth_required or @oauth_aware.
|
|
"""
|
|
return self.credentials is not None and not self.credentials.invalid
|
|
|
|
def authorize_url(self):
|
|
"""Returns the URL to start the OAuth dance.
|
|
|
|
Must only be called from with a webapp.RequestHandler subclassed method
|
|
that had been decorated with either @oauth_required or @oauth_aware.
|
|
"""
|
|
url = self.flow.step1_get_authorize_url()
|
|
return str(url)
|
|
|
|
def http(self, *args, **kwargs):
|
|
"""Returns an authorized http instance.
|
|
|
|
Must only be called from within an @oauth_required decorated method, or
|
|
from within an @oauth_aware decorated method where has_credentials()
|
|
returns True.
|
|
|
|
Args:
|
|
*args: Positional arguments passed to httplib2.Http constructor.
|
|
**kwargs: Positional arguments passed to httplib2.Http constructor.
|
|
"""
|
|
return self.credentials.authorize(httplib2.Http(*args, **kwargs))
|
|
|
|
@property
|
|
def callback_path(self):
|
|
"""The absolute path where the callback will occur.
|
|
|
|
Note this is the absolute path, not the absolute URI, that will be
|
|
calculated by the decorator at runtime. See callback_handler() for how
|
|
this should be used.
|
|
|
|
Returns:
|
|
The callback path as a string.
|
|
"""
|
|
return self._callback_path
|
|
|
|
def callback_handler(self):
|
|
"""RequestHandler for the OAuth 2.0 redirect callback.
|
|
|
|
Usage::
|
|
|
|
app = webapp.WSGIApplication([
|
|
('/index', MyIndexHandler),
|
|
...,
|
|
(decorator.callback_path, decorator.callback_handler())
|
|
])
|
|
|
|
Returns:
|
|
A webapp.RequestHandler that handles the redirect back from the
|
|
server during the OAuth 2.0 dance.
|
|
"""
|
|
decorator = self
|
|
|
|
class OAuth2Handler(webapp.RequestHandler):
|
|
"""Handler for the redirect_uri of the OAuth 2.0 dance."""
|
|
|
|
@login_required
|
|
def get(self):
|
|
error = self.request.get('error')
|
|
if error:
|
|
errormsg = self.request.get('error_description', error)
|
|
self.response.out.write(
|
|
'The authorization request failed: {0}'.format(
|
|
_safe_html(errormsg)))
|
|
else:
|
|
user = users.get_current_user()
|
|
decorator._create_flow(self)
|
|
credentials = decorator.flow.step2_exchange(
|
|
self.request.params)
|
|
decorator._storage_class(
|
|
decorator._credentials_class, None,
|
|
decorator._credentials_property_name,
|
|
user=user).put(credentials)
|
|
redirect_uri = _parse_state_value(
|
|
str(self.request.get('state')), user)
|
|
if redirect_uri is None:
|
|
self.response.out.write(
|
|
'The authorization request failed')
|
|
return
|
|
|
|
if (decorator._token_response_param and
|
|
credentials.token_response):
|
|
resp_json = json.dumps(credentials.token_response)
|
|
redirect_uri = util._add_query_parameter(
|
|
redirect_uri, decorator._token_response_param,
|
|
resp_json)
|
|
|
|
self.redirect(redirect_uri)
|
|
|
|
return OAuth2Handler
|
|
|
|
def callback_application(self):
|
|
"""WSGI application for handling the OAuth 2.0 redirect callback.
|
|
|
|
If you need finer grained control use `callback_handler` which returns
|
|
just the webapp.RequestHandler.
|
|
|
|
Returns:
|
|
A webapp.WSGIApplication that handles the redirect back from the
|
|
server during the OAuth 2.0 dance.
|
|
"""
|
|
return webapp.WSGIApplication([
|
|
(self.callback_path, self.callback_handler())
|
|
])
|
|
|
|
|
|
class OAuth2DecoratorFromClientSecrets(OAuth2Decorator):
|
|
"""An OAuth2Decorator that builds from a clientsecrets file.
|
|
|
|
Uses a clientsecrets file as the source for all the information when
|
|
constructing an OAuth2Decorator.
|
|
|
|
::
|
|
|
|
decorator = OAuth2DecoratorFromClientSecrets(
|
|
os.path.join(os.path.dirname(__file__), 'client_secrets.json')
|
|
scope='https://www.googleapis.com/auth/plus')
|
|
|
|
class MainHandler(webapp.RequestHandler):
|
|
@decorator.oauth_required
|
|
def get(self):
|
|
http = decorator.http()
|
|
# http is authorized with the user's Credentials and can be
|
|
# used in API calls
|
|
|
|
"""
|
|
|
|
@util.positional(3)
|
|
def __init__(self, filename, scope, message=None, cache=None, **kwargs):
|
|
"""Constructor
|
|
|
|
Args:
|
|
filename: string, File name of client secrets.
|
|
scope: string or iterable of strings, scope(s) of the credentials
|
|
being requested.
|
|
message: string, A friendly string to display to the user if the
|
|
clientsecrets file is missing or invalid. The message may
|
|
contain HTML and will be presented on the web interface
|
|
for any method that uses the decorator.
|
|
cache: An optional cache service client that implements get() and
|
|
set()
|
|
methods. See clientsecrets.loadfile() for details.
|
|
**kwargs: dict, Keyword arguments are passed along as kwargs to
|
|
the OAuth2WebServerFlow constructor.
|
|
"""
|
|
client_type, client_info = clientsecrets.loadfile(filename,
|
|
cache=cache)
|
|
if client_type not in (clientsecrets.TYPE_WEB,
|
|
clientsecrets.TYPE_INSTALLED):
|
|
raise clientsecrets.InvalidClientSecretsError(
|
|
"OAuth2Decorator doesn't support this OAuth 2.0 flow.")
|
|
|
|
constructor_kwargs = dict(kwargs)
|
|
constructor_kwargs.update({
|
|
'auth_uri': client_info['auth_uri'],
|
|
'token_uri': client_info['token_uri'],
|
|
'message': message,
|
|
})
|
|
revoke_uri = client_info.get('revoke_uri')
|
|
if revoke_uri is not None:
|
|
constructor_kwargs['revoke_uri'] = revoke_uri
|
|
super(OAuth2DecoratorFromClientSecrets, self).__init__(
|
|
client_info['client_id'], client_info['client_secret'],
|
|
scope, **constructor_kwargs)
|
|
if message is not None:
|
|
self._message = message
|
|
else:
|
|
self._message = 'Please configure your application for OAuth 2.0.'
|
|
|
|
|
|
@util.positional(2)
|
|
def oauth2decorator_from_clientsecrets(filename, scope,
|
|
message=None, cache=None):
|
|
"""Creates an OAuth2Decorator populated from a clientsecrets file.
|
|
|
|
Args:
|
|
filename: string, File name of client secrets.
|
|
scope: string or list of strings, scope(s) of the credentials being
|
|
requested.
|
|
message: string, A friendly string to display to the user if the
|
|
clientsecrets file is missing or invalid. The message may
|
|
contain HTML and will be presented on the web interface for
|
|
any method that uses the decorator.
|
|
cache: An optional cache service client that implements get() and set()
|
|
methods. See clientsecrets.loadfile() for details.
|
|
|
|
Returns: An OAuth2Decorator
|
|
"""
|
|
return OAuth2DecoratorFromClientSecrets(filename, scope,
|
|
message=message, cache=cache)
|