chore: revert the changes in app/backend

Co-authored-by: Fredrik Adelöw <freben@users.noreply.github.com>
Co-authored-by: Johan Haals <johan.haals@gmail.com>
Co-authored-by: Patrik Oldsberg <poldsberg@gmail.com>

Signed-off-by: blam <ben@blam.sh>

.changeset/seven-adults-act.md

@@ -2,14 +2,24 @@
 '@backstage/plugin-auth-backend': patch
 ---
 
-Adds custom sign-in resolvers and profile transformation for Google auth provider. Read more about what this means for Backstage user identity and determining ownership of entities https://backstage.io/docs/auth/identity-resolver
-Related the [RFC] From Identity to Ownership, v2 https://github.com/backstage/backstage/issues/4089
+Adds support for custom sign-in resolvers and profile transformations for the
+Google auth provider.
 
-Adds `ent` field in the claims of Backstage ID Token with a list of entity references containing identity and membership info about the user across multiple systems.
+Adds an `ent` claim in Backstage tokens, with a list of
+[entity references](https://backstage.io/docs/features/software-catalog/references)
+related to your signed-in user's identities and groups across multiple systems.
 
-Adds an optional `providerFactories` to the `createRouter` exported by the auth-backend plugin.
+Adds an optional `providerFactories` argument to the `createRouter` exported by
+the `auth-backend` plugin.
 
 Updates `BackstageIdentity` so that
 
 - `idToken` is deprecated in favor of `token`
 - An optional `entity` field is added which represents the entity that the user is represented by within Backstage.
+
+More information:
+
+- [The identity resolver documentation](https://backstage.io/docs/auth/identity-resolver)
+  explains the concepts and shows how to implement your own.
+- The [From Identity to Ownership](https://github.com/backstage/backstage/issues/4089)
+  RFC contains details about how this affects ownership in the catalog

packages/backend/src/plugins/auth.ts

@@ -14,10 +14,7 @@
  * limitations under the License.
  */
 
-import {
-  createGoogleProvider,
-  createRouter,
-} from '@backstage/plugin-auth-backend';
+import { createRouter } from '@backstage/plugin-auth-backend';
 import { Router } from 'express';
 import { PluginEnvironment } from '../types';
 
@@ -27,27 +24,5 @@ export default async function createPlugin({
   config,
   discovery,
 }: PluginEnvironment): Promise<Router> {
-  return await createRouter({
-    logger,
-    config,
-    database,
-    discovery,
-    providerFactories: {
-      google: createGoogleProvider({
-        signIn: {
-          // resolver: 'email',
-          resolver: async ({ profile: { email } }, ctx) => {
-            if (!email) {
-              throw new Error('No email associated with user account');
-            }
-            const id = email.split('@')[0];
-            const token = await ctx.tokenIssuer.issueToken({
-              claims: { sub: id, ent: [`User:default/${id}`] },
-            });
-            return { id, token };
-          },
-        },
-      }),
-    },
-  });
+  return await createRouter({ logger, config, database, discovery });
 }