Dropbox login

This tutorial will guild you how to dropbox login, first things first, you must have dropbox account, create a application to receive client id and secret, for more details please see this create dropbox app.

Once you have client id and secret, please read the instructions below to get start with dropbox login.

Note: Dropbox login using OAuth 2.0, for more information please read this article. One more things is your redirect_uri must start with https

System requirements

  • PHP 5.4 or higher
  • APACHE 2.4.9 or higher
  • Netbean IDE

Project Structure

dropbox structure

Implement code

Create projecthelper.php

We wrote one tutorial about projecthelper.php, view more at here, if you were already read it, please add this function in file.

  • public static function get_dropbox_config() {
    return $config = array(
    'client_id' => 'your-client-id',
    'client_secret' => 'client-secret',
    'redirect_uri' => self::get_base_url('dropbox-callback.php'),
    'login' => self::get_base_url('dropbox-login.php'),
    'session' => 'dropbox_access_token'
    );

Create dropbox-login.php

This file will undertake two main tasks, check access_token in $_SESSION, if existed, send request to get user's profile, the opposite will create $authen_url for the user grant access your applications to connect to their accounts.

- Create $authen_url link

  •  $auth_url = 'https://www.dropbox.com/1/oauth2/authorize?'
    . 'client_id=' . $config['client_id'] .
    '&redirect_uri=' . $config['redirect_uri'] .
    '&state=12212' .
    '&response_type=code';
    echo '<a href="' . $auth_url . '">Log in with Dropbox</a>';

- Send request to get user's profile and print result on screen

  •  $access_token = $_SESSION[$config['session']];
    $endpoint = 'https://api.dropboxapi.com/1/account/info';
    $header = array(
    'GET /1/account/info HTTP/1.1',
    'Host: api.dropboxapi.com',
    'Authorization: Bearer ' . $access_token['access_token']
    );
    $data = projecthelper::make_request($endpoint, $header);
    var_dump($data);

<?php

/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
include './projecthelper.php';
$config = projecthelper::get_dropbox_config();

if (isset($_SESSION[$config['session']])) {
$access_token = $_SESSION[$config['session']];
$endpoint = 'https://api.dropboxapi.com/1/account/info';
$header = array(
'GET /1/account/info HTTP/1.1',
'Host: api.dropboxapi.com',
'Authorization: Bearer ' . $access_token['access_token']
);
$data = projecthelper::make_request($endpoint, $header);
var_dump($data);
} else {

$auth_url = 'https://www.dropbox.com/1/oauth2/authorize?'
. 'client_id=' . $config['client_id'] .
'&redirect_uri=' . $config['redirect_uri'] .
'&state=12212' .
'&response_type=code';
echo '<a href="' . $auth_url . '">Log in with Dropbox</a>';
}

Create dropbox-callback.php

After granted access to your application, user will be redirected to your redirect_uri with authentication code. Then you will make request to get access_token.
(In some cases, your redirect_uri that you provide must match with the one you've described in app's settings, or redirect_uri must begin with https).

+ Check and extract authentication code

  • Send request to get access_token
  •  $code = $_GET['code'];
    $endpoint = 'https://api.dropboxapi.com/1/oauth2/token';
    $header = array(
    'POST /1/oauth2/token HTTP/1.1',
    'Host: api.dropboxapi.com'
    );
    $post_fields = 'client_id=' . $config['client_id'] .
    '&client_secret=' . $config['client_secret'] .
    '&code=' . $code .
    '&grant_type=authorization_code';

    $data = projecthelper::make_request($endpoint, $header, $post_fields);
  • Get result, if there is no error, save the result get into $_SESSION and navigate user to the login page.
  •  $_SESSION[$config['session']] = $data;
    header('Location: ' . $config['login']);
  • If there are errors, print to the screen
  •  print_r($data);

+ If there are errors, print to the screen

  • print_r($_GET);

<?php
include './projecthelper.php';
$config = projecthelper::get_dropbox_config();
if (isset($_GET['code'])) {
$code = $_GET['code'];
$endpoint = 'https://api.dropboxapi.com/1/oauth2/token';
$header = array(
'POST /1/oauth2/token HTTP/1.1',
'Host: api.dropboxapi.com'
);
$post_fields = 'client_id=' . $config['client_id'] .
'&client_secret=' . $config['client_secret'] .
'&code=' . $code .
'&grant_type=authorization_code';

$data = projecthelper::make_request($endpoint, $header, $post_fields);

if (isset($data['access_token'])) {
$_SESSION[$config['session']] = $data;
header('Location: ' . $config['login']);
}
}

After implement code, run project and view result or you can view our example here. If you have questions, don't hesitate, tell us