# What this PR does
The following is deployed under a feature flag.
**How it works**
1. The user clicks on the "Connect using your Google account" button in
the user profile settings modal
2. The UI makes a call to `GET /api/internal/v1/login/google-oauth2`.
The backend has now been configured to add
`apps.social_auth.backends.GoogleOAuth2` as a "`social_auth` backend".
3. The backend will respond w/ a URL which points to the Google OAuth2
consent screen. The frontend then proceeds by sending the user to this
page. This URL includes the following query parameters (amongst others):
- `redirect_uri` - this will send the user back to
`/api/internal/v1/complete/google-oauth2` (ie. make another API call to
the OnCall backend to finalize the Google OAuth2 flow)
- `state` - this represents an
`apps.auth_token.models.GoogleOAuth2Token` token. This allows us to
identify the OnCall user once they've linked their Google account.
4. Once redirected back to `/api/internal/v1/complete/google-oauth2`,
this will complete the OAuth2 flow. At this point, the backend has
access to several pieces of information about the Google user, including
their `access_token` and `refresh_token`. We persist these (encrypted)
for future use to fetch the user's out-of-office calendar events
5. The response from the API call in 4 above ☝️ is HTTP 302 (redirect)
to `/a/grafana-oncall-app/users/me` (ie. open the user profile settings
modal). At this point the user will see that their account has been
connected and they can further configure the settings
## Which issue(s) this PR closes
Closes https://github.com/grafana/oncall-private/issues/2584
## Checklist
- [x] Unit, integration, and e2e (if applicable) tests updated
- [x] Documentation added (or `pr:no public docs` PR label added if not
required) - will be done in
https://github.com/grafana/oncall-private/issues/2591
- [x] Added the relevant release notes label (see labels prefixed w/
`release:`). These labels dictate how your PR will
show up in the autogenerated release notes. - will be done in
https://github.com/grafana/oncall-private/issues/2591
---------
Co-authored-by: Dominik <dominik.broj@grafana.com>
Co-authored-by: Maxim Mordasov <maxim.mordasov@grafana.com>
