Rename examples to demo

demo/db.py

@@ -0,0 +1,35 @@
+import sqlalchemy as sa
+
+
+metadata = sa.Metadata()
+
+
+users = sa.Table(
+    'users', metadata,
+    sa.Column('id', sa.Integer, nullable=False),
+    sa.Column('login', sa.String(256), nullable=False),
+    sa.Column('passwd', sa.String(256), nullable=False),
+    sa.Column('salt', sa.String(256), nullable=False),
+    sa.Column('is_superuser', sa.Boolean, nullable=False,
+              server_default='FALSE'),
+    sa.Column('disabled', sa.Boolean, nullable=False,
+              server_default='FALSE'),
+
+    # indices
+    sa.PrimaryKeyConstraint('id', name='user_pkey'),
+    sa.UniqueConstraint('login', name='user_login_key'),
+)
+
+
+permissions = sa.Table(
+    'permissions', metadata,
+    sa.Column('id', sa.Integer, nullable=False),
+    sa.Column('user_id', sa.Integer, nullable=False),
+    sa.Column('perm_name', sa.String(64), nullable=False),
+
+    # indices
+    sa.PrimaryKeyConstraint('id', name='permission_pkey'),
+    sa.ForeignKeyConstraint(['user_id'], [users.c.id],
+                            name='user_permission_fkey',
+                            ondelete='CASCADE'),
+)

demo/db_auth.py

@@ -0,0 +1,23 @@
+import asyncio
+
+from aiohttp_security.authorization import AbstractAuthorizationPolicy
+
+
+class DBAuthorizationPolicy(AbstractAuthorizationPolicy):
+    def __init__(self, db_pool):
+        self.db_pool = db_pool
+
+    @asyncio.coroutine
+    def permits(self, identity, permission, context=None):
+        record = self.data.get(identity)
+        if record is not None:
+            # TODO: implement actual permission checker
+            if permission in record:
+                return True
+        return False
+
+    @asyncio.coroutine
+    def authorized_user_id(self, identity):
+        with (yield from self.db_pool) as conn:
+            conn
+        return identity if identity in self.data else None