Merge pull request #6051 from weseek/feat/v5-create-gcs-instance-without-keyfile

feat: Get GCS instance that uses Application Default Credentials for v5

packages/app/src/server/service/file-uploader/gcs.js

@@ -2,8 +2,8 @@ import loggerFactory from '~/utils/logger';
 
 const logger = loggerFactory('growi:service:fileUploaderAws');
 
-const urljoin = require('url-join');
 const { Storage } = require('@google-cloud/storage');
+const urljoin = require('url-join');
 
 let _instance;
 
@@ -21,7 +21,9 @@ module.exports = function(crowi) {
     if (_instance == null) {
       const keyFilename = configManager.getConfig('crowi', 'gcs:apiKeyJsonPath');
       // see https://googleapis.dev/nodejs/storage/latest/Storage.html
-      _instance = new Storage({ keyFilename });
+      _instance = keyFilename != null
+        ? new Storage({ keyFilename }) // Create a client with explicit credentials
+        : new Storage(); // Create a client that uses Application Default Credentials
     }
     return _instance;
   }