Add Snapchat OAuth provider

[nwneisen]

What kind of change does this PR introduce?

Adds a feature for Snapchat OAuth. Resolves #436

What is the current behavior?

Snapchat is not available as an OAuth provided

What is the new behavior?

Snapchat can be used as an OAuth provider using the same process as the other OAuth providers found in GoTrue

• Creating an application on the oauth provider site
• Generating your own client_id and secret
• Testing that http://localhost:9999/authorize?provider=snapchat redirects you to the provider sign-in page
• The callback is handled properly
• Gotrue redirects to the SITE_URL or one of the URI's specified in the URI_ALLOW_LIST with the access_token, provider_token, expiry and refresh_token as query fragments
• Writing tests for the new OAuth provider implemented

Additional context

Snapchat OAuth does not use an email. This runs in to the same issue as #214. I put a hack in to get around the checks but I'm sure we want something better.

[kangmingtay]

hey @nwneisen, thanks for the contribution! could you kindly document the steps you took to set up the oauth2 app on snapchat? i've tried testing out your PR locally but am running into this issue on the callback / redirect

[kangmingtay]

hmm this is pretty hacky and it wouldn't really work out because we have a unique constraint on the email column

[nwneisen]

I agree. It doesn't look like there is a great solution ATM. I took a look at #414 and left a comment. Let me know if there's anything else that could help get it merged.

[kangmingtay]

oauth2.NoContext seems to be deprecated in favour of context.Background() - lets use that instead

[nwneisen]

@kangmingtay This is how I have my snapchat configured. Let me know if you need additional info for any section.

1. Create a developer account on https://kit.snapchat.com/. Setup your organization and a project.
2. Open the project and click + New Version on the left to create a new version.

• Fill out any required information
• Enable the Login Kit section. Enable the Display Name, Bitmoji Avatar, and add a Redirect URI. I just modified my /etc/hosts and did http://localhost:9999/callback.

4. Open the Setup tab and set the new version as active in the Staging dropdown.

• Click the add button to generate a Confidential OAuth 2.0 Client ID. Add the Confidential Client ID and Confidential Client Secret to your .env. file.
• Add your snapchat Username to the Demo Users section

5. Navigate to `localhost:9999/authorize?provider=snapchat in your browser

[hf]

Hey this PR has been outdated for a long while now. I'll close it, but if you still wish to contribute please re-open it or submit a new one!

[nwneisen]

Hey this PR has been outdated for a long while now. I'll close it, but if you still wish to contribute please re-open it or submit a new one!

This was waiting for the email constraint to be removed. Otherwise, everything should've been addressed for it.

[hf]

@nwneisen Oh sorry, I may have rushed too much.

[Thedarklord09]

https://www.snapchat.com/add/misssdazling?share_id=Q9mxTyeRMjA&locale=en-IN