Google login - add prompt=select_account option

[EvgeniGordeev]

Description

Google configuration page does not let configure prompt param to be passed to google login.

Scenario:

1. Use Google for login
2. User chooses google account
3. User realizes they logged in with the wrong google account and restart the login process.
   Issue: user cannot get to google select account any more and is stuck with the first google account. If multiple google sessions are authenticated for given user then google account picker is displayed.
   Expected: even if there is a single authenticated google session client can request an account picker with query param prompt=select_account. Thus Google configuration page on Identity Providers must support setting prompt param.

Discussion

No response

Motivation

Make google login more user-friendly on single authenticated google session with prompt=select_account.

Details

Workaround:

add CustomGoogleIdentityProviderFactory to META-INF/services/org.keycloak.broker.social.SocialIdentityProviderFactory file

public class CustomGoogleIdentityProviderFactory extends GoogleIdentityProviderFactory {
    @Override
    public GoogleIdentityProvider create(KeycloakSession session, IdentityProviderModel model) {
        return new CustomGoogleIdentityProvider(session, new GoogleIdentityProviderConfig(model));
    }
}

...
public class CustomGoogleIdentityProvider extends GoogleIdentityProvider {
    public CustomGoogleIdentityProvider(KeycloakSession session, GoogleIdentityProviderConfig config) {
        super(session, config);
    }

    @Override
    protected UriBuilder createAuthorizationUrl(AuthenticationRequest request) {
        UriBuilder uriBuilder = super.createAuthorizationUrl(request);
        uriBuilder.queryParam("prompt", "select_account");
        return uriBuilder;
    }
}

Cloned from #14258.

[jonkoops]

Not entirely sure this is an issue related to the UI of Keycloak, sounds more like a logic issue. @ssilvert WDYT?

[ssilvert]

@jonkoops It's not a UI issue. But it sounds like a good enhancement. It's for core or maybe a more specific area. I'm moving this to keycloak/keycloak repo. Not sure which area label is correct, so hoping core team can sort it out.