Google Storage set file permission when Save File or Write Stream

The brackets in the Google cloud storage or Firebase storage have a permission set which is common to all files.

However, we should have the capability to set the permission to each file as we need.

Although I have discussed early in the post Make Storage Public , the custom permission can correctly assign using  ALC.

Refer the Doc:https://cloud.google.com/nodejs/docs/reference/storage/1.3.x/Acl#add


If you are using a storage file you can access the file and do the modification.

   const file = firebase.storage().bucket().file('originals/file.png');

                                   const options = {
                                    entity: 'allUsers',
                                    role: storage.acl.READER_ROLE
                                  };

                            file.acl.add(options, function(err, aclObject) {});


If you are using a write stream, the process is a bit different.


You have to create metadata variable as below.

  const metadata = {
    contentType: contentType,
    public:true,
    'acl': [
         {
           "entity": "allUsers",
          "role": gcloud.acl.READER_ROLE
        }
       ]
  };

And set it to the write stream associated with the bucket.

  const thumbnailUploadStream = bucket.file(thumbFilePath).createWriteStream({metadata});