added simplistic dictionary_auth example (#105)

demo/dictionary_auth/main.py

@@ -0,0 +1,33 @@
+import base64
+from cryptography import fernet
+from aiohttp import web
+from aiohttp_session import setup as setup_session
+from aiohttp_session.cookie_storage import EncryptedCookieStorage
+from aiohttp_security import setup as setup_security
+from aiohttp_security import SessionIdentityPolicy
+
+from .authz import DictionaryAuthorizationPolicy
+from .handlers import configure_handlers
+from .users import user_map
+
+
+def make_app():
+    app = web.Application()
+    app.user_map = user_map
+    configure_handlers(app)
+
+    # secret_key must be 32 url-safe base64-encoded bytes
+    fernet_key = fernet.Fernet.generate_key()
+    secret_key = base64.urlsafe_b64decode(fernet_key)
+
+    storage = EncryptedCookieStorage(secret_key, cookie_name='API_SESSION')
+    setup_session(app, storage)
+
+    policy = SessionIdentityPolicy()
+    setup_security(app, policy, DictionaryAuthorizationPolicy(user_map))
+
+    return app
+
+
+if __name__ == '__main__':
+    web.run_app(make_app(), port=9000)