backend: mock custom google auth provider

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

packages/backend/src/plugins/auth.ts

@@ -14,7 +14,11 @@
  * limitations under the License.
  */
 
-import { createRouter } from '@backstage/plugin-auth-backend';
+import {
+  createGoogleProvider,
+  createRouter,
+  defaultAuthProviderFactories,
+} from '@backstage/plugin-auth-backend';
 import { Router } from 'express';
 import { PluginEnvironment } from '../types';
 
@@ -24,5 +28,28 @@ export default async function createPlugin({
   config,
   discovery,
 }: PluginEnvironment): Promise<Router> {
-  return await createRouter({ logger, config, database, discovery });
+  return await createRouter({
+    logger,
+    config,
+    database,
+    discovery,
+    providerFactories: {
+      ...defaultAuthProviderFactories,
+      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: [id] },
+            });
+            return { id, token };
+          },
+        },
+      }),
+    },
+  });
 }