--- /dev/null
+<?php
+/**
+ * Get an OAuth2 token from Google.
+ * * Install this script on your server so that it's accessible
+ * as [https/http]://<yourdomain>/<folder>/get_oauth_token.php
+ * e.g.: http://localhost/phpmail/get_oauth_token.php
+ * * Ensure dependencies are installed with 'composer install'
+ * * Set up an app in your Google developer console
+ * * Set the script address as the app's redirect URL
+ * If no refresh token is obtained when running this file, revoke access to your app
+ * using link: https://accounts.google.com/b/0/IssuedAuthSubTokens and run the script again.
+ * This script requires PHP 5.4 or later
+ * PHP Version 5.4
+ */
+
+require 'vendor/autoload.php';
+
+session_start();
+
+//If this automatic URL doesn't work, set it yourself manually
+$redirectUri = isset($_SERVER['HTTPS']) ? 'https://' : 'http://' . $_SERVER['HTTP_HOST'] . $_SERVER['PHP_SELF'];
+//$redirectUri = 'http://localhost/phpmailer/get_oauth_token.php';
+
+//These details obtained are by setting up app in Google developer console.
+$clientId = 'RANDOMCHARS-----duv1n2.apps.googleusercontent.com';
+$clientSecret = 'RANDOMCHARS-----lGyjPcRtvP';
+
+//Set Redirect URI in Developer Console as [https/http]://<yourdomain>/<folder>/get_oauth_token.php
+$provider = new League\OAuth2\Client\Provider\Google(
+ array(
+ 'clientId' => $clientId,
+ 'clientSecret' => $clientSecret,
+ 'redirectUri' => $redirectUri,
+ 'scopes' => array('https://mail.google.com/'),
+ 'accessType' => 'offline'
+ )
+);
+
+if (!isset($_GET['code'])) {
+ // If we don't have an authorization code then get one
+ $authUrl = $provider->getAuthorizationUrl();
+ $_SESSION['oauth2state'] = $provider->getState();
+ header('Location: ' . $authUrl);
+ exit;
+// Check given state against previously stored one to mitigate CSRF attack
+} elseif (empty($_GET['state']) || ($_GET['state'] !== $_SESSION['oauth2state'])) {
+ unset($_SESSION['oauth2state']);
+ exit('Invalid state');
+} else {
+ // Try to get an access token (using the authorization code grant)
+ $token = $provider->getAccessToken(
+ 'authorization_code',
+ array(
+ 'code' => $_GET['code']
+ )
+ );
+
+ // Use this to get a new access token if the old one expires
+ echo 'Refresh Token: ' . $token->getRefreshToken();
+}