add email for backstage profile

packages/core/src/layout/SignInPage/gitlabProvider.tsx

@@ -32,7 +32,7 @@ const Component: ProviderComponent = ({ onResult }) => {
 
       const profile = await gitlabAuthApi.getProfile();
       onResult({
-        userId: identity?.id || profile.email,
+        userId: identity!.id,
         profile: profile!,
         getIdToken: () =>
           gitlabAuthApi.getBackstageIdentity().then(i => i!.idToken),

plugins/auth-backend/src/providers/gitlab/provider.ts

@@ -78,6 +78,14 @@ export class GitlabAuthProvider implements OAuthProviderHandlers {
       idToken: params.id_token,
     };
 
+    // gitlab provides an id numeric value (123)
+    // as a fallback
+    let id = passportProfile!.id;
+
+    if (profile.email) {
+      id = profile.email.split('@')[0];
+    }
+
     if (params.expires_in) {
       providerInfo.expiresInSeconds = params.expires_in;
     }
@@ -87,6 +95,9 @@ export class GitlabAuthProvider implements OAuthProviderHandlers {
     return {
       providerInfo,
       profile,
+      backstageIdentity: {
+        id,
+      },
     };
   }