A tiny utility to authenticate requests using GCP OAuth and send CORS headers in Flask
A small class that helps with authentication and CORS for HTTP-triggered cloud functions written in Python and hosted on GCP
Please note: This is not an officially supported Google product.
If you are using OAuth to authenticate to a Cloud Function written in Python and hosted on GCP, and your client is running in a browser, this is for you. If not, you probably won't find this useful.
This class does three things:
- Responds correctly and configurably to the HTTP OPTIONS method used by browsers to do pre-flight checks as part of CORS
- Retrieves an OAuth2 token supplied in the
AuthorizationHTTP header, validates it, and then fetches the information encoded by the token
- Gives you back either a valid token, or a response to send back to the user in case a valid token can't be found
You can install the latest version of this package using pip:
python3 -m pip install --user gcloud-flask-oauth-cors
It's hosted on pypi: https://pypi.org/project/gcloud-flask-oauth-cors/
import gcloud_flask_oauth_cors as oauth def my_function_name(request): auth = oauth.Auth(os.getenv("OAUTH_CLIENT_ID")) id_info = auth.get_id_info(request) if id_info is None: # If we were called with the HTTP OPTIONS method, this will return the relevant CORS headers. # If another HTTP method was used and we can't authenticate, this will return a 401 (Unauthorized) return auth.get_response() # Do something with the id_info, for example: print(id_info["sub"])
On the client side, you can use Google Sign-in. Make sure you pass your
id_token in any requests like this:
let xhr = new XMLHttpRequest(); xhr.setRequestHeader("Authorization", "Bearer " + id_token);
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