Google Drive API download NODE.JS sample doesn't work

Question

Here is my code based on Google: "Here are examples of performing a file download with our Drive API client libraries." NODE.JS

const fs = require('fs')
const google = require('googleapis')
const googleAuth = require('google-auth-library')

const SCOPES = ['https://www.googleapis.com/auth/drive'] // Full, permissive scope to access all of a user's files, excluding the Application Data folder. Request this scope only when it is strictly necessary.
const TOKEN_DIR = './credentials/'
const TOKEN_PATH = TOKEN_DIR + 'token4joeDlEs6.json'
const CLIENT_SECRET_FILEPATH = 'client_secret.json'

var clientSecretStr = fs.readFileSync(CLIENT_SECRET_FILEPATH).toString('utf-8')
var tokenStr = fs.readFileSync(TOKEN_PATH).toString('utf-8')


var credentials = JSON.parse(clientSecretStr) 

var clientSecret = credentials.installed.client_secret
var clientId = credentials.installed.client_id
var redirectUrl = credentials.installed.redirect_uris[0]
var auth = new googleAuth()
var oauth2Client = new auth.OAuth2(clientId, clientSecret, redirectUrl)

oauth2Client.credentials = JSON.parse(tokenStr)

var drive = google.drive('v3');

// ["Examples"-NODE.JS tab](https://developers.google.com/drive/v3/web/manage-downloads)
var fileId = 'OBFUSCATED' // Safeway (OBFUSCATED)
var dest = fs.createWriteStream('out/safeway.txt')
drive.files.get({
  auth: oauth2Client,
  fileId: fileId,
  //alt: 'media'
})
    .on('end', function () {
      console.log('Done');
    })
    .on('error', function (err) {
      console.log('Error during download', err);
    })
    .pipe(dest);

RUNS WITHOUT ERRORS:

$ node joeDlSample.js
Done
$

EXPECTED RESULT

out/safeway.txt to contain my shopping list. :)

ACTUAL RESULT

out/safeway.txt contains

{
  "access_token" : "OBFUSCATED.OBFUSCATED",
  "expires_in" : 3600,
  "token_type" : "Bearer"
}

2nd RUN CLOSER TO EXAMPLE

I also uploaded a .jpg picture, & uncommented the alt: media line in the code

EXPECTED RESULT

out/elb.jpg to contain elb picture

ACTUAL RESULT

out/elb.jpg contains

{
  "access_token" : "OBFUSCATED.OBFUSCATED",
  "expires_in" : 3600,
  "token_type" : "Bearer"
}

Answer 1

I managed to get Downloading Files in Drive API working by combining the Drive NodeJS Quickstart and the Download Files sample for NodeJS.

From the NodeJS Quickstart there's this line:

authorize(JSON.parse(content), listFiles);

I created my own downloadFile function to download files instead of listing files and modified the above mentioned line to

  authorize(JSON.parse(content), downloadFile);

And here's the downloadFile function part from the NodeJS sample:

function downloadFile(auth){
  var service = google.drive('v3');
  var fileId = 'FILE_ID_OF_SHOPPINGLIST_TEXT_FILE';
  var dest = fs.createWriteStream('/usr/local/google/home/username/Downloads/shoppinglist.txt');

  service.files.get({
      auth: auth,
      fileId: fileId,
      alt: 'media'
  })
      .on('end', function () {
        console.log('Done');
      })
      .on('error', function (err) {
        console.log('Error during download', err);
      })
      .pipe(dest);
}

The downloaded file in my Downloads folder:

Works for me :)