This app provides a generic integration engine for OIDC providers. It provides a way to connect any oidc account to Nextcloud.
It works by running the oidc auth flow for a user, including getting consent, against any oidc provider and collects a refersh token that is used to periodically refesh access tokens allowing other apps to use them for integration, such as email sync, calendar sync or anything else.
For configuring an oidc provider for gmail, this is a sensible start:
name: Google
auth_endpoint: https://accounts.google.com/o/oauth2/v2/auth
client_id: <Client ID from https://console.cloud.google.com/apis/credentials>
client_secret: <Client Secret from https://console.cloud.google.com/apis/credentials>
scope: https://mail.google.com/ openid profile email
revoke_endpoint: https://oauth2.googleapis.com/revoke
token_endpoint: https://oauth2.googleapis.com/token
user_endpoint: https://accounts.google.com/o/oauth2/v2/user
Note: scope is a space separated list and you need openid and profile to get user info at all, and email if you want the users email.