在Firebase Cloud Functions中，如何获取刚上传到存储桶的内容的URL？

Question

The Firebase documentation demonstrates here如何将文件上传到存储桶。

但是，它没有提到如何获取内容的URL，例如，您可以将其发送回用户，以便他们可以访问内容。

.then(() => {
  console.log('Thumbnail created at', tempFilePath);

  // We add a 'thumb_' prefix to thumbnails file name. That's where we'll upload the thumbnail.
  const thumbFileName = `thumb_${fileName}`;
  const thumbFilePath = path.join(path.dirname(filePath), thumbFileName);

  // Uploading the thumbnail.
  return bucket.upload(tempFilePath, {
    destination: thumbFilePath,
    metadata: metadata,
  });

}).then(() => /* How do I return the content URL to the user?? */ );