<?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_name(SESSION_NAME);
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->state;
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 {
$provider->accessType = 'offline';
// Try to get an access token (using the authorization code grant)
$token = $provider->getAccessToken(
'authorization_code',
array(
'code' => $_GET['code']
)
);
// Use this to interact with an API on the users behalf
// echo $token->accessToken.'<br>';
// Use this to get a new access token if the old one expires
echo 'Refresh Token: ' . $token->refreshToken;
// Unix timestamp of when the token will expire, and need refreshing
// echo $token->expires;
}
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