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<?php/*
 * get_gmail_oauth_access_token.php
 *
 * @(#) $Id: get_gmail_oauth_access_token.php,v 1.1 2022/10/09 19:28:16 mlemos Exp $
 *
 */
 
 /*
 *  Get the http.php file from http://www.phpclasses.org/httpclient
 */
 require('http.php');
 
 /*
 *  Get the oauth_client.php and file_oauth_client.php file from http://www.phpclasses.org/oauth-api
 */
 require('oauth_client.php');
 require('file_oauth_client.php');
 
 $client = new file_oauth_client_class;
 $client->server = 'Google';
 
 $client->file = array(
 'name'=>'Gmail-oauth-token.json'
 
 );
 
 // set the offline access only if you need to call an API
 // when the user is not present and the token may expire
 $client->offline = true;
 
 $client->debug = false;
 $client->debug_http = false;
 $client->redirect_uri = 'https://'.$_SERVER['HTTP_HOST'].
 dirname(strtok($_SERVER['REQUEST_URI'],'?')).'/get_gmail_oauth_access_token.php';
 
 $client->client_id = ''; $application_line = __LINE__;
 $client->client_secret = '';
 
 if(strlen($client->client_id) == 0
 || strlen($client->client_secret) == 0)
 die('Please go to Google APIs console page '.
 'https://console.cloud.google.com/apis/dashboard'.
 'to create a new OAuth API client.');
 
 /* API permissions
 */
 $client->scope = 'https://www.googleapis.com/auth/userinfo.email '.
 'https://www.googleapis.com/auth/userinfo.profile https://mail.google.com/';
 if(($success = $client->Initialize()))
 {
 if(($success = $client->Process()))
 {
 if(strlen($client->authorization_error))
 {
 $client->error = $client->authorization_error;
 $success = false;
 }
 elseif(strlen($client->access_token))
 {
 $success = $client->CallAPI(
 'https://www.googleapis.com/oauth2/v1/userinfo',
 'GET', array(), array('FailOnAccessError'=>true), $user);
 }
 }
 $success = $client->Finalize($success);
 }
 if($client->exit)
 exit;
 if($success)
 {
 ?>
 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 <html>
 <head>
 <title>Google OAuth client results</title>
 </head>
 <body>
 <?php
 echo '<h1>', HtmlSpecialChars($user->name),
 ' you have logged in successfully with Google!</h1>';
 echo '<pre>', HtmlSpecialChars(print_r($user, 1)), '</pre>';
 echo '<pre>Access token: ', HtmlSpecialChars($client->access_token), '</pre>';
 echo '<pre>Access token expiry date: ', $client->access_token_expiry, '</pre>';
 $client->ResetAccessToken();
 ?>
 </body>
 </html>
 <?php
 }
 else
 {
 ?>
 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 <html>
 <head>
 <title>OAuth client error</title>
 </head>
 <body>
 <h1>OAuth client error</h1>
 <pre>Error: <?php echo HtmlSpecialChars($client->error); ?></pre>
 </body>
 </html>
 <?php
 }
 
 ?>
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