feat(examples): add authorized_sanic.py

You can check a request if the client is authorized
to access a resource by the decorator `authorized`

examples/authorized_sanic.py

@@ -0,0 +1,42 @@
+# -*- coding: utf-8 -*-
+
+from sanic import Sanic
+from functools import wraps
+from sanic.response import json
+
+app = Sanic()
+
+
+def check_request_for_authorization_status(request):
+    # Note: Define your check, for instance cookie, session.
+    flag = True
+    return flag
+
+
+def authorized():
+    def decorator(f):
+        @wraps(f)
+        async def decorated_function(request, *args, **kwargs):
+            # run some method that checks the request
+            # for the client's authorization status
+            is_authorized = check_request_for_authorization_status(request)
+
+            if is_authorized:
+                # the user is authorized.
+                # run the handler method and return the response
+                response = await f(request, *args, **kwargs)
+                return response
+            else:
+                # the user is not authorized.
+                return json({'status': 'not_authorized'}, 403)
+        return decorated_function
+    return decorator
+
+
+@app.route("/")
+@authorized()
+async def test(request):
+    return json({'status': 'authorized'})
+
+if __name__ == "__main__":
+    app.run(host="0.0.0.0", port=8000)