backend-app-api: add createAuthIntegrationRouter

Signed-off-by: Vincenzo Scamporlino <vincenzos@spotify.com>

packages/backend-app-api/src/services/implementations/auth/createAuthIntegrationRouter.ts

@@ -0,0 +1,30 @@
+/*
+ * Copyright 2024 The Backstage Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import { PublicKeyStoreService } from '@backstage/backend-plugin-api';
+import express from 'express';
+import Router from 'express-promise-router';
+
+export function createAuthIntegrationRouter(options: {
+  publicKeyStore: PublicKeyStoreService;
+}): express.Router {
+  const router = Router();
+
+  router.get('/.backstage/auth/v1/jwks.json', async (_req, res) => {
+    res.json({ keys: await options.publicKeyStore.listKeys() });
+  });
+
+  return router;
+}

packages/backend-app-api/src/services/implementations/auth/index.ts

@@ -15,3 +15,4 @@
  */
 
 export { authServiceFactory } from './authServiceFactory';
+export { createAuthIntegrationRouter } from './createAuthIntegrationRouter';