How to get a list of all files in Cloud Storage in a Firebase app?

Question

I\'m working on uploading images, everything works great, but I have 100 pictures and I would like to show all of them in my View, as I get the complete list of

Answer 1

Since Mar 2017: With the addition of Firebase Cloud Functions, and Firebase's deeper integration with Google Cloud, this is now possible.

With Cloud Functions you can use the Google Cloud Node package to do epic operations on Cloud Storage. Below is an example that gets all the file URLs into an array from Cloud Storage. This function will be triggered every time something's saved to google cloud storage.

Note 1: This is a rather computationally expensive operation, as it has to cycle through all files in a bucket / folder.

Note 2: I wrote this just as an example, without paying much detail into promises etc. Just to give an idea.

const functions = require('firebase-functions');
const gcs = require('@google-cloud/storage')();

// let's trigger this function with a file upload to google cloud storage

exports.fileUploaded = functions.storage.object().onChange(event => {

  const object = event.data; // the object that was just uploaded
  const bucket = gcs.bucket(object.bucket);
  const signedUrlConfig = { action: 'read', expires: '03-17-2025' }; // this is a signed url configuration object

  var fileURLs = []; // array to hold all file urls 

  // this is just for the sake of this example. Ideally you should get the path from the object that is uploaded :)
  const folderPath = "a/path/you/want/its/folder/size/calculated";

  bucket.getFiles({ prefix: folderPath }, function(err, files) {
    // files = array of file objects
    // not the contents of these files, we're not downloading the files. 

    files.forEach(function(file) {
      file.getSignedUrl(signedUrlConfig, function(err, fileURL) {
        console.log(fileURL);
        fileURLs.push(fileURL);
      });
    });

  });

});

I hope this will give you the general idea. For better cloud functions examples, check out Google's Github repo full of Cloud Functions samples for Firebase. Also check out their Google Cloud Node API Documentation