Transfer files to dropbox from node js without browser based oauth authentication

I am running a nodejs + express based api server from heroku and using the dropbox-js library. Here's what I'd like to do:

  1. A user hits a specific api endpoint and kicks off the process.
  2. Generate some text files via a node process and save them on the server
  3. Transfer these files to a dropbox that I own using my own credentials (user and dropbox app).

There will never be a case when a random user needs to do this.. it's a team account and this is an internal tool.

The part that is tripping me up is that dropbox wants to open a browser window and get permission from me to connect to the app. The issue is that I obviously can't click the button when the process is running on the heroku instance.

Is there any way for me to authorize access to the app totally in node?

I feel like I could potentially use a phantomJS process to click the button - but it seems too complicated and I'd like to avoid it if possible.

Here is my authentication code:

    // Libraries
    var Dropbox         = require('dropbox');

    var DROPBOX_APP_KEY    = "key";
    var DROPBOX_APP_SECRET = "secret";

    var dbClient = new Dropbox.Client({
      key: DROPBOX_APP_KEY, secret: DROPBOX_APP_SECRET, sandbox: false
    });

    dbClient.authDriver(new Dropbox.Drivers.NodeServer(8191));

    dbClient.authenticate(function(error, client) {
      if (error) {
        console.log("Some shit happened trying to authenticate with dropbox");
        console.log(error);
        return;
      }


      client.writeFile("test.txt", "sometext", function (error, stat) {
        if (error) {
          console.log(error);
          return;
        }

        console.log("file saved!");
        console.log(stat);
      });
    });

Took me a bit of testing, but it's possible.

First, you need to authenticate through the browser and save the token and token secret that are returned by Dropbox: 

dbClient.authenticate(function(error, client) {
  console.log('connected...');
  console.log('token ', client.oauth.token);       // THE_TOKEN
  console.log('secret', client.oauth.tokenSecret); // THE_TOKEN_SECRET
  ...
});

Once you have the token and the secret, you can use them in the Dropbox.Client constructor:

var dbClient = new Dropbox.Client({
  key         : DROPBOX_APP_KEY,
  secret      : DROPBOX_APP_SECRET,
  sandbox     : false,
  token       : THE_TOKEN,
  tokenSecret : THE_TOKEN_SECRET
});

After that, you won't get bothered with having to authenticate through a browser anymore (or at least not until someone runs the code again without the token and the secret, which will make Dropbox generate a new token/secret pair and invalidate the old ones, or the apps credentials are revoked).

Or you can just use the Implicit grant and get the oauth token.

        var client = new Dropbox.Client({
            key: "xxxxx",
            secret: "xxxxx",
            token:"asssdsadadsadasdasdasdasdaddadadadsdsa", //got from implicit grant
            sandbox:false
        });

No need to get to the browser at all.This line is no longer required!

   client.authDriver(new Dropbox.AuthDriver.NodeServer(8191));