Building the authentication page (Django REST Framework) and adding all its functionality

[alexgarel]

What

• [ ] Implement user authentication through open food facts cookie:
• when the user comes to the portal, and is not yet authenticated:
  • if he does not have OFF cookie → tell him to go authenticate on OFF portal and come back
  • if he does have a cookie, get the user id
  • if the user id is not in the database, create it
  • authenticate the user (custom authentication method)

    Part of

• 2

[alexgarel]

Maybe blocked by https://github.com/openfoodfacts/openfoodfacts-server/issues/6462 (priority on @alexgarel)

To test it locally: edit your /etc/hosts (or equivalent windows) to have community.openfoodfacts.net point to 127.0.0.1, then use this address in your browser to test. If not possible on windows, ask Stephane, to add a test-community.openfoodfacts.net in our DNS pointing to 127.0.0.1.

[stephanegigandet]

@sumit-158 : To check if the user is authentified, call https://world.openfoodfacts.org/cgi/session.pl?jqm=1 with the session cookie.

If the user is identified, you will get a response like this one:

{ name: "Stéphane Gigandet", user_id: "stephane" }

[M123-dev]

If there isn't a cookie we can use the wrapper around login from off-dart but we would still have to somehow write the cookie