adds a User-Agent header to existing API requests in this package to clearly identify API requests from this Google Cloud Storage

Signed-off-by: armandocomellas1 <cgarmando@google.com>

.changeset/neat-kiwis-joke.md

@@ -0,0 +1,5 @@
+---
+'@backstage/backend-common': minor
+---
+
+adds a User-Agent header to existing API requests in this package to clearly identify API requests from this Google Cloud Storage. headers are formatted as follows where `libVersion` represents the current dotted version number of the Backstage GCs package and `libName` represent the current Google API used at backstage.

packages/backend-common/src/reading/GoogleGcsUrlReader.test.ts

@@ -20,6 +20,7 @@ import { getVoidLogger } from '../logging';
 import { DefaultReadTreeResponseFactory } from './tree';
 import { GoogleGcsUrlReader } from './GoogleGcsUrlReader';
 import { UrlReaderPredicateTuple } from './types';
+import packageinfo from '../../package.json';
 
 const bucketGetFilesMock = jest.fn();
 jest.mock('@google-cloud/storage', () => {
@@ -77,6 +78,20 @@ describe('GcsUrlReader', () => {
     });
     expect(entries).toHaveLength(1);
   });
+  it('check if userAgent has been called with this key value', async () => {
+    const getStorage: any = {
+      userAgent: `backstage/kubernetes-backend.GkeClusterLocator/${packageinfo.version}`,
+    };
+    jest.mock('@google-cloud/storage', () => {
+      return {
+        Storage: jest.fn(() => getStorage),
+      };
+    });
+    const getUserAgent = getStorage.userAgent.toString();
+    expect(getUserAgent).toBe(
+      `backstage/kubernetes-backend.GkeClusterLocator/${packageinfo.version}`,
+    );
+  });
 
   describe('predicates', () => {
     const readers = createReader({

packages/backend-common/src/reading/GoogleGcsUrlReader.ts

@@ -30,6 +30,7 @@ import {
 } from '@backstage/integration';
 import { Readable } from 'stream';
 import { ReadUrlResponseFactory } from './ReadUrlResponseFactory';
+import packageinfo from '../../package.json';
 
 const GOOGLE_GCS_HOST = 'storage.cloud.google.com';
 
@@ -68,13 +69,16 @@ export class GoogleGcsUrlReader implements UrlReader {
       logger.info(
         'googleGcs credentials not found in config. Using default credentials provider.',
       );
-      storage = new Storage();
+      storage = new Storage({
+        userAgent: `backstage/kubernetes-backend.GkeClusterLocator/${packageinfo.version}`,
+      });
     } else {
       storage = new Storage({
         credentials: {
           client_email: gcsConfig.clientEmail || undefined,
           private_key: gcsConfig.privateKey || undefined,
         },
+        userAgent: `backstage/kubernetes-backend.GkeClusterLocator/${packageinfo.version}`,
       });
     }
     const reader = new GoogleGcsUrlReader(gcsConfig, storage);