云功能:调整大小的图像未加载 [英] Cloud Functions: Resized images not loading

问题描述

我正在关注 教程 以通过 Cloud 调整图像大小上传功能，遇到两个我无法弄清楚的主要问题:

I am following a tutorial to resize images via Cloud Functions on upload and am experiencing two major issues which I can't figure out:

1) 如果上传了 PNG，它会生成正确大小的缩略图，但它们的预览不会加载到 Firestorage 中(加载微调器会无限期地显示).它只在我点击生成新的访问令牌"后显示图像(生成的缩略图最初都没有访问令牌).

1) If a PNG is uploaded, it generates the correctly sized thumbnails, but the preview of them won't load in Firestorage (Loading spinner shows indefinitely). It only shows the image after I click on "Generate new access token" (none of the generated thumbnails have an access token initially).

2) 如果上传的是 JPEG 或任何其他格式，则 MIME 类型显示为application/octet-stream".我不确定如何正确提取扩展名以放入新生成的缩略图的文件名中?

2) If a JPEG or any other format is uploaded, the MIME type shows as "application/octet-stream". I'm not sure how to extract the extension correctly to put into the filename of the newly generated thumbnails?

export const generateThumbs = functions.storage
.object()
.onFinalize(async object => {
  const bucket = gcs.bucket(object.bucket);
  const filePath = object.name;
  const fileName = filePath.split('/').pop();
  const bucketDir = dirname(filePath);

  const workingDir = join(tmpdir(), 'thumbs');
  const tmpFilePath = join(workingDir, 'source.png');

  if (fileName.includes('thumb@') || !object.contentType.includes('image')) {
    console.log('exiting function');
    return false;
  }

  // 1. Ensure thumbnail dir exists
  await fs.ensureDir(workingDir);

 // 2. Download Source File
 await bucket.file(filePath).download({
   destination: tmpFilePath
 });

// 3. Resize the images and define an array of upload promises
 const sizes = [64, 128, 256];

 const uploadPromises = sizes.map(async size => {
  const thumbName = `thumb@${size}_${fileName}`;
  const thumbPath = join(workingDir, thumbName);

  // Resize source image
   await sharp(tmpFilePath)
    .resize(size, size)
    .toFile(thumbPath);

  // Upload to GCS
  return bucket.upload(thumbPath, {
    destination: join(bucketDir, thumbName)
  });
});

// 4. Run the upload operations
  await Promise.all(uploadPromises);

// 5. Cleanup remove the tmp/thumbs from the filesystem
  return fs.remove(workingDir);
  });

非常感谢任何反馈！

推荐答案

我刚遇到同样的问题，不知道什么原因 Firebase 的 Resize Images on 故意从调整后的图片中删除下载令牌

I just had the same problem, for unknown reason Firebase's Resize Images on purposely remove the download token from the resized image

禁用删除下载访问令牌

• 转到 https://console.cloud.google.com
• 从左侧选择 Cloud Functions
• 选择 ext-storage-resize-images-generateResizedImage
• 点击编辑
• 从内联编辑器转到文件 FUNCTIONS/LIB/INDEX.JS
• 在此行之前添加//(delete metadata.metadata.firebaseStorageDownloadTokens;)
• 也注释此文件中的同一行FUNCTIONS/SRC/INDEX.TS
• 按 DEPLOY 并等待它完成

• goto https://console.cloud.google.com
• select Cloud Functions from the left
• select ext-storage-resize-images-generateResizedImage
• Click EDIT
• from Inline Editor goto file FUNCTIONS/LIB/INDEX.JS
• Add // before this line (delete metadata.metadata.firebaseStorageDownloadTokens;)
• Comment the same line from this file too FUNCTIONS/SRC/INDEX.TS
• Press DEPLOY and wait until it finish

注意:原始和调整大小将具有相同的令牌.

note: both original and resized will have the same Token.

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