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I have followed this document link to create login in php using google identity toolkit. when I am using below mentioned code index page showing as blank. In browser console it is showing error like (500 internal server error). index.php
<!DOCTYPE html>
<html>
<head>
<!-- 1: Load the Google Identity Toolkit helpers -->
<?php
set_include_path(get_include_path() . PATH_SEPARATOR . __DIR__ .'/vendor/google/apiclient/src');
require_once __DIR__ . '/vendor/autoload.php';
$gitkitClient = Gitkit_Client::createFromFile(dirname(__FILE__) . '/gitkit-server-config.json');
$gitkitUser = $gitkitClient->getUserInRequest();
?>
<!-- End modification 1 -->
<script type="text/javascript" src="//www.gstatic.com/authtoolkit/js/gitkit.js"></script>
<link type=text/css rel=stylesheet href="//www.gstatic.com/authtoolkit/css/gitkit.css" />
<script type=text/javascript>
window.google.identitytoolkit.signInButton(
'#navbar',
{
widgetUrl: "/gitkit",
signOutUrl: "/index"
}
);
</script>
</head>
<body>
<div id="navbar"></div>
<!-- 2: Print the user information if a signed in user is present -->
<p>
<?php if ($gitkitUser) { ?>
Welcome back!<br><br>
Email: <?= $gitkitUser->getEmail() ?><br>
Id: <?= $gitkitUser->getUserId() ?><br>
Name: <?= $gitkitUser->getDisplayName() ?><br>
Identity provider: <?= $gitkitUser->getProviderId() ?><br>
<?php } else { ?>
You are not logged in yet.
<?php } ?>
</p>
<!-- End modification 2 -->
</body>
</html>
gitkit.php
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<!-- Copy and paste here the client configuration from Developer Console into the config variable -->
<script type="text/javascript" src="//www.gstatic.com/authtoolkit/js/gitkit.js"></script>
<link type="text/css" rel="stylesheet" href="//www.gstatic.com/authtoolkit/css/gitkit.css" />
<script type="text/javascript">
var config =
// Copy and paste client configuration here
;
// The HTTP POST body should be escaped by the server to prevent XSS
window.google.identitytoolkit.start(
'#gitkitWidgetDiv', // accepts any CSS selector
config,
JSON.parse('<?php echo json_encode(file_get_contents("php://input")); ?>')
);
</script>
<!-- End modification -->
</head>
<body>
<!-- Include the sign in page widget with the matching 'gitkitWidgetDiv' id -->
<div id="gitkitWidgetDiv"></div>
<!-- End identity toolkit widget -->
</body>
</html>
In index.php, you need to include OAuth2.php as well. Here's the repository: https://github.com/google/google-api-php-client/tree/v1-master. The file path is /src/Google/Auth/OAuth2.php. Let me know if that fixes the problem.