feat(proxy): implement proxy backend plugin

packages/backend/package.json

@@ -25,6 +25,7 @@
     "@backstage/plugin-auth-backend": "^0.1.1-alpha.12",
     "@backstage/plugin-catalog-backend": "^0.1.1-alpha.12",
     "@backstage/plugin-identity-backend": "^0.1.1-alpha.12",
+    "@backstage/plugin-proxy-backend": "^0.1.1-alpha.12",
     "@backstage/plugin-scaffolder-backend": "^0.1.1-alpha.12",
     "@backstage/plugin-sentry-backend": "^0.1.1-alpha.12",
     "dockerode": "^3.2.0",

packages/backend/src/index.ts

@@ -35,6 +35,7 @@ import catalog from './plugins/catalog';
 import identity from './plugins/identity';
 import scaffolder from './plugins/scaffolder';
 import sentry from './plugins/sentry';
+import proxy from './plugins/proxy';
 import { PluginEnvironment } from './types';
 
 function makeCreateEnv(loadedConfigs: AppConfig[]) {
@@ -63,6 +64,7 @@ async function main() {
   const scaffolderEnv = useHotMemoize(module, () => createEnv('scaffolder'));
   const authEnv = useHotMemoize(module, () => createEnv('auth'));
   const identityEnv = useHotMemoize(module, () => createEnv('identity'));
+  const proxyEnv = useHotMemoize(module, () => createEnv('proxy'));
 
   const service = createServiceBuilder(module)
     .loadConfig(configReader)
@@ -73,7 +75,8 @@ async function main() {
       await sentry(getRootLogger().child({ type: 'plugin', plugin: 'sentry' })),
     )
     .addRouter('/auth', await auth(authEnv))
-    .addRouter('/identity', await identity(identityEnv));
+    .addRouter('/identity', await identity(identityEnv))
+    .addRouter('/', await proxy(proxyEnv));
 
   await service.start().catch(err => {
     console.log(err);

packages/backend/src/plugins/proxy.ts

@@ -0,0 +1,25 @@
+/*
+ * Copyright 2020 Spotify AB
+ *
+ * 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.
+ */
+// @ts-ignore
+import { createRouter } from '@backstage/plugin-proxy-backend';
+import { PluginEnvironment } from '../types';
+
+export default async function createPlugin({
+  logger,
+  config,
+}: PluginEnvironment) {
+  return await createRouter({ logger, config });
+}