worked

.firebaserc

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+{
+  "projects": {
+    "default": "cloud-fnc"
+  }
+}

.gitignore

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+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+firebase-debug.log*
+
+# Firebase cache
+.firebase/
+
+# Firebase config
+
+# Uncomment this if you'd like others to create their own Firebase project.
+# For a team working on the same Firebase project(s), it is recommended to leave
+# it commented so all members can deploy to the same project(s) in .firebaserc.
+# .firebaserc
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (http://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variables file
+.env

firebase.json

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+{}

functions/.gitignore

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+node_modules/

functions/index.js

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+const functions = require('firebase-functions');
+const { v4: uuidv4 } = require('uuid');
+
+const path = require('path');
+const os = require('os');
+const fs = require('fs');
+
+
+const admin = require('firebase-admin');
+admin.initializeApp();
+
+// // Create and Deploy Your First Cloud Functions
+// // https://firebase.google.com/docs/functions/write-firebase-functions
+//
+exports.onFileChange = functions.storage.object().onFinalize(async (object) => {
+  const bucket = object.bucket;
+  const contentType = object.contentType;
+  const filePath = object.name;
+  const fileName = path.basename(filePath);
+  const destBucket = admin.storage().bucket(bucket);
+  const prefix = 'Renamed-';
+
+  if (!contentType.startsWith('image/')) {
+    return console.log('This is not an image.');
+  }
+
+
+  if (fileName.startsWith(prefix)) {
+    // Get the Signed URLs for the thumbnail and original image.
+    const config = {
+      action: 'read',
+      expires: '03-01-2500',
+    };
+
+    const renamedFile = destBucket.file(fileName);
+    console.log('renamedFile:', renamedFile);
+
+    await renamedFile.getSignedUrl(config);
+
+    return console.log('skip this file');
+  }
+
+  console.log('File change detected, function execution started');
+
+  const tmpFilePath = path.join(os.tmpdir(), filePath);
+
+
+  await destBucket.file(filePath).download({destination: tmpFilePath});
+
+  const uuid = uuidv4();
+  const metadata = {
+    contentType: contentType,
+    metadata: {
+      firebaseStorageDownloadTokens: uuid
+    }
+
+  };
+  await destBucket.upload(tmpFilePath, {
+    destination: prefix + fileName,
+    metadata: metadata,
+    public: true,
+    predefinedAcl: 'publicRead'
+  });
+
+  // remove the temporary file
+  fs.unlinkSync(tmpFilePath);
+
+
+
+
+  return console.log('done');
+});