从使用Cloud Functions for Fire上传的文件获取下载网址 [英] Get Download URL from file uploaded with Cloud Functions for Firebase

问题描述

我有这个：

  ... 
 
返回桶
 .upload（fromFilePath，{destination：toFilePath}）
 .then（（err，file）=> {
 
 //获取文件
 
}的下载网址）; 
  

目标文件有很多参数。即使是一个名为 mediaLink 的。然而，如果我尝试访问这个链接，我得到这个错误：

 匿名用户没有storage.objects.get访问to object ... 
  

有人可以告诉我如何获得公开下载Url吗？

谢谢

解决方案

您需要使用 getSignedURL 通过 @ google-cloud / storage NPM模块。

示例：

  const gcs = require（'@ google-cloud / storage'）（{ keyFilename：'service-account.json'}）; 
 // ... 
 const bucket = gcs.bucket（bucket）; 
 const file = bucket.file（fileName）; 
 return file.getSignedUrl（{
 action：'read'，
 expires：'03 -09-2491'
}）。then（signedUrls => {
 // signedUrls [0]包含文件的公共URL 
}）; 
  

您需要初始化 @ google-cloud / storage 与您的服务帐户凭据作为应用程序默认值凭证是不够的。

After uploading a file in Firebase Storage with Functions for Firebase, I'd like to get the download url of the file.

I have this :

...

return bucket
    .upload(fromFilePath, {destination: toFilePath})
    .then((err, file) => {

        // Get the download url of file

    });

The object file has a lot of parameters. Even one named mediaLink. However, if I try to access this link, I get this error :

Anonymous users does not have storage.objects.get access to object ...

Can somebody tell me how to get the public download Url?

Thank you

解决方案

You'll need to generate a signed URL using getSignedURL via the @google-cloud/storage NPM module.

Example:

const gcs = require('@google-cloud/storage')({keyFilename: 'service-account.json'});
// ...
const bucket = gcs.bucket(bucket);
const file = bucket.file(fileName);
return file.getSignedUrl({
  action: 'read',
  expires: '03-09-2491'
}).then(signedUrls => {
  // signedUrls[0] contains the file's public URL
});

You'll need to initialize @google-cloud/storage with your service account credentials as the application default credentials will not be sufficient.

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