Add SQLAlchemy storage

docs/source/oauth2client.contrib.rst

@@ -22,6 +22,7 @@ Submodules
    oauth2client.contrib.keyring_storage
    oauth2client.contrib.locked_file
    oauth2client.contrib.multistore_file
+   oauth2client.contrib.sql_alchemy
    oauth2client.contrib.xsrfutil
 
 Module contents

docs/source/oauth2client.contrib.sql_alchemy.rst

@@ -0,0 +1,7 @@
+oauth2client.contrib.sql_alchemy module
+=======================================
+
+.. automodule:: oauth2client.contrib.sql_alchemy
+    :members:
+    :undoc-members:
+    :show-inheritance:

oauth2client/contrib/sqlalchemy.py

@@ -0,0 +1,173 @@
+# Copyright 2016 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 utilities for SQLAlchemy.
+
+Utilities for using OAuth 2.0 in conjunction with a SQLAlchemy.
+
+Configuration
+=============
+
+In order to use this storage, you'll need to create table
+with :class:`oauth2client.contrib.sql_alchemy.CredentialsType` column.
+It's recommended to either put this column on some sort of user info
+table or put the column in a table with a belongs-to relationship to
+a user info table.
+
+Here's an example of a simple table with a :class:`CredentialsType`
+column that's related to a user table by the `user_id` key.
+
+.. code-block:: python
+
+    from oauth2client.contrib.sql_alchemy import CredentialsType
+    from sqlalchemy import Column, ForeignKey, Integer
+    from sqlalchemy.ext.declarative import declarative_base
+    from sqlalchemy.orm import relationship
+
+
+    Base = declarative_base()
+
+
+    class Credentials(Base):
+        __tablename__ = 'credentials'
+
+        user_id = Column(Integer, ForeignKey('user.id'))
+        credentials = Column(CredentialsType)
+
+
+    class User(Base):
+        id = Column(Integer, primary_key=True)
+        # bunch of other columns
+        credentials = relationship('Credentials')
+
+
+Usage
+=====
+
+With tables ready, you are now able to store credentials in database.
+We will reuse tables defined above.
+
+.. code-block:: python
+
+    from oauth2client.client import OAuth2Credentials
+    from oauth2client.contrib.sql_alchemy import Storage
+    from sqlalchemy.orm import Session
+
+    session = Session()
+    user = session.query(User).first()
+    storage = Storage(
+        session=session,
+        model_class=Credentials,
+        # This is the key column used to identify
+        # the row that stores the credentials.
+        key_name='user_id',
+        key_value=user.id,
+        property_name='credentials',
+    )
+
+    # Store
+    credentials = OAuth2Credentials(...)
+    storage.put(credentials)
+
+    # Retrieve
+    credentials = storage.get()
+
+    # Delete
+    storage.delete()
+
+"""
+
+from __future__ import absolute_import
+
+from oauth2client.client import Storage as BaseStorage
+from sqlalchemy.types import PickleType
+
+
+class CredentialsType(PickleType):
+    """Type representing credentials.
+
+    Alias for :class:`sqlalchemy.types.PickleType`.
+    """
+
+
+class Storage(BaseStorage):
+    """Store and retrieve a single credential to and from SQLAlchemy.
+    This helper presumes the Credentials
+    have been stored as a Credentials column
+    on a db model class.
+    """
+
+    def __init__(self, session, model_class, key_name,
+                 key_value, property_name):
+        """Constructor for Storage.
+
+        Args:
+            session: An instance of :class:`sqlalchemy.orm.Session`.
+            model_class: SQLAlchemy declarative mapping.
+            key_name: string, key name for the entity that has the credentials
+            key_value: key value for the entity that has the credentials
+            property_name: A string indicating which property on the
+                           ``model_class`` to store the credentials.
+                           This property must be a
+                           :class:`CredentialsType` column.
+        """
+        super(Storage, self).__init__()
+
+        self.session = session
+        self.model_class = model_class
+        self.key_name = key_name
+        self.key_value = key_value
+        self.property_name = property_name
+
+    def locked_get(self):
+        """Retrieve stored credential.
+
+        Returns:
+            A :cls:`oauth2client.Credentials` instance or `None`.
+        """
+        credential = None
+
+        session = self.session
+        query = {self.key_name: self.key_value}
+
+        entity = session.query(self.model_class).filter_by(**query).first()
+        if entity:
+            credential = getattr(entity, self.property_name)
+            if credential and hasattr(credential, 'set_store'):
+                credential.set_store(self)
+
+        return credential
+
+    def locked_put(self, credentials):
+        """Write a credentials to the SQLAlchemy datastore.
+
+        Args:
+            credentials: :cls:`oauth2client.Credentials`
+        """
+        session = self.session
+        query = {self.key_name: self.key_value}
+
+        entity = session.query(self.model_class).filter_by(**query).first()
+        if not entity:
+            entity = self.model_class(**query)
+
+        setattr(entity, self.property_name, credentials)
+        session.add(entity)
+
+    def locked_delete(self):
+        """Delete credentials from the SQLAlchemy datastore."""
+
+        session = self.session
+        query = {self.key_name: self.key_value}
+        session.query(self.model_class).filter_by(**query).delete()

tests/contrib/test_sqlalchemy.py

@@ -0,0 +1,120 @@
+# Copyright 2016 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.
+
+import datetime
+import unittest
+
+from sqlalchemy import Column, create_engine, Integer
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.orm import sessionmaker
+
+from oauth2client import GOOGLE_TOKEN_URI
+from oauth2client.client import OAuth2Credentials
+from oauth2client.contrib.sqlalchemy import CredentialsType, Storage
+
+Base = declarative_base()
+
+
+class DummyModel(Base):
+    __tablename__ = 'dummy'
+
+    id = Column(Integer, primary_key=True)
+    key = Column(Integer)  # we will query against this, because of ROWID
+    credentials = Column(CredentialsType)
+
+
+class TestSQLAlchemyStorage(unittest.TestCase):
+    engine = create_engine('sqlite://')
+
+    @classmethod
+    def setUpClass(cls):
+        Base.metadata.create_all(cls.engine)
+        cls.session = sessionmaker(bind=cls.engine)
+
+    def setUp(self):
+        self.credentials = OAuth2Credentials(
+            access_token='token',
+            client_id='client_id',
+            client_secret='client_secret',
+            refresh_token='refresh_token',
+            token_expiry=datetime.datetime.utcnow(),
+            token_uri=GOOGLE_TOKEN_URI,
+            user_agent='DummyAgent',
+        )
+
+    def tearDown(self):
+        session = self.session()
+        session.query(DummyModel).filter_by(id=1).delete()
+        session.commit()
+
+    def compare_credentials(self, result):
+        self.assertEqual(result.access_token, self.credentials.access_token)
+        self.assertEqual(result.client_id, self.credentials.client_id)
+        self.assertEqual(result.client_secret, self.credentials.client_secret)
+        self.assertEqual(result.refresh_token, self.credentials.refresh_token)
+        self.assertEqual(result.token_expiry, self.credentials.token_expiry)
+        self.assertEqual(result.token_uri, self.credentials.token_uri)
+        self.assertEqual(result.user_agent, self.credentials.user_agent)
+
+    def test_get(self):
+        session = self.session()
+        session.add(DummyModel(
+            key=1,
+            credentials=self.credentials,
+        ))
+        session.commit()
+
+        ret = Storage(
+            session=session,
+            model_class=DummyModel,
+            key_name='key',
+            key_value=1,
+            property_name='credentials',
+        ).get()
+
+        self.compare_credentials(ret)
+
+    def test_put(self):
+        session = self.session()
+        Storage(
+            session=session,
+            model_class=DummyModel,
+            key_name='key',
+            key_value=1,
+            property_name='credentials',
+        ).put(self.credentials)
+        session.commit()
+
+        ret = session.query(DummyModel).filter_by(key=1).first()
+        self.compare_credentials(ret.credentials)
+
+    def test_delete(self):
+        session = self.session()
+        session.add(DummyModel(
+            key=1,
+            credentials=self.credentials,
+        ))
+        session.commit()
+
+        q = session.query(DummyModel).filter_by(key=1)
+        self.assertTrue(q.first() is not None)
+        Storage(
+            session=session,
+            model_class=DummyModel,
+            key_name='key',
+            key_value=1,
+            property_name='credentials',
+        ).delete()
+        session.commit()
+        self.assertTrue(q.first() is None)

tox.ini

@@ -10,6 +10,7 @@ basedeps = mock>=1.3.0
            nose
            flask
            unittest2
+           sqlalchemy
 deps = {[testenv]basedeps}
        django
        keyring