SQL Migrations: Rewrite table creation completely.

We have migrations creating new tables. Those currently use
"raw" table definitions. This easily gives errors (we
already had this problem).

So instead rewrite those to use declarative tables and use
those to create new tables. Just copy the new table over to
the migration, strip it down to the bare minimum, rename to
_v0, base it on declarative_base() and be done!

Do this for the current migrations.

mediagoblin/plugins/oauth/migrations.py

@@ -14,16 +14,94 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-from sqlalchemy import MetaData, Table
+from datetime import datetime, timedelta
+from sqlalchemy import (MetaData, Table, Column,
+                        Integer, Unicode, Enum, DateTime, ForeignKey)
+from sqlalchemy.ext.declarative import declarative_base
 
 from mediagoblin.db.sql.util import RegisterMigration
+from mediagoblin.db.sql.models import User
 
-from mediagoblin.plugins.oauth.models import OAuthClient, OAuthToken, \
-        OAuthUserClient, OAuthCode
 
 MIGRATIONS = {}
 
 
+class OAuthClient_v0(declarative_base()):
+    __tablename__ = 'oauth__client'
+
+    id = Column(Integer, primary_key=True)
+    created = Column(DateTime, nullable=False,
+            default=datetime.now)
+
+    name = Column(Unicode)
+    description = Column(Unicode)
+
+    identifier = Column(Unicode, unique=True, index=True)
+    secret = Column(Unicode, index=True)
+
+    owner_id = Column(Integer, ForeignKey(User.id))
+    redirect_uri = Column(Unicode)
+
+    type = Column(Enum(
+        u'confidential',
+        u'public',
+        name=u'oauth__client_type'))
+
+
+class OAuthUserClient_v0(declarative_base()):
+    __tablename__ = 'oauth__user_client'
+    id = Column(Integer, primary_key=True)
+
+    user_id = Column(Integer, ForeignKey(User.id))
+    client_id = Column(Integer, ForeignKey(OAuthClient_v0.id))
+
+    state = Column(Enum(
+        u'approved',
+        u'rejected',
+        name=u'oauth__relation_state'))
+
+
+class OAuthToken_v0(declarative_base()):
+    __tablename__ = 'oauth__tokens'
+
+    id = Column(Integer, primary_key=True)
+    created = Column(DateTime, nullable=False,
+            default=datetime.now)
+    expires = Column(DateTime, nullable=False,
+            default=lambda: datetime.now() + timedelta(days=30))
+    token = Column(Unicode, index=True)
+    refresh_token = Column(Unicode, index=True)
+
+    user_id = Column(Integer, ForeignKey(User.id), nullable=False,
+            index=True)
+
+    client_id = Column(Integer, ForeignKey(OAuthClient_v0.id), nullable=False)
+
+    def __repr__(self):
+        return '<{0} #{1} expires {2} [{3}, {4}]>'.format(
+                self.__class__.__name__,
+                self.id,
+                self.expires.isoformat(),
+                self.user,
+                self.client)
+
+
+class OAuthCode_v0(declarative_base()):
+    __tablename__ = 'oauth__codes'
+
+    id = Column(Integer, primary_key=True)
+    created = Column(DateTime, nullable=False,
+            default=datetime.now)
+    expires = Column(DateTime, nullable=False,
+            default=lambda: datetime.now() + timedelta(minutes=5))
+    code = Column(Unicode, index=True)
+
+    user_id = Column(Integer, ForeignKey(User.id), nullable=False,
+            index=True)
+
+    client_id = Column(Integer, ForeignKey(OAuthClient_v0.id), nullable=False)
+
+
 @RegisterMigration(1, MIGRATIONS)
 def remove_and_replace_token_and_code(db):
     metadata = MetaData(bind=db.bind)
@@ -38,9 +116,9 @@ def remove_and_replace_token_and_code(db):
 
     code_table.drop()
 
-    OAuthClient.__table__.create(db.bind)
-    OAuthUserClient.__table__.create(db.bind)
-    OAuthToken.__table__.create(db.bind)
-    OAuthCode.__table__.create(db.bind)
+    OAuthClient_v0.__table__.create(db.bind)
+    OAuthUserClient_v0.__table__.create(db.bind)
+    OAuthToken_v0.__table__.create(db.bind)
+    OAuthCode_v0.__table__.create(db.bind)
 
     db.commit()