postredirect.php

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<?php

if (array_key_exists('RedirId', $_REQUEST)) {
        $postId = $_REQUEST['RedirId'];
        $session = SimpleSAML_Session::getSessionFromRequest();
} elseif (array_key_exists('RedirInfo', $_REQUEST)) {
        $encData = base64_decode($_REQUEST['RedirInfo']);

        if (empty($encData)) {
                throw new SimpleSAML_Error_BadRequest('Invalid RedirInfo data.');
        }

        list($sessionId, $postId) = explode(':', SimpleSAML\Utils\Crypto::aesDecrypt($encData));

        if (empty($sessionId) || empty($postId)) {
                throw new SimpleSAML_Error_BadRequest('Invalid session info data.');
        }

        $session = SimpleSAML_Session::getSession($sessionId);
} else {
        throw new SimpleSAML_Error_BadRequest('Missing redirection info parameter.');
}

if ($session === NULL) {
        throw new Exception('Unable to load session.');
}

$postData = $session->getData('core_postdatalink', $postId);

if ($postData === NULL) {
        // The post data is missing, probably because it timed out
        throw new Exception('The POST data we should restore was lost.');
}

$session->deleteData('core_postdatalink', $postId);

assert(is_array($postData));
assert(array_key_exists('url', $postData));
assert(array_key_exists('post', $postData));

$config = SimpleSAML_Configuration::getInstance();
$template = new SimpleSAML_XHTML_Template($config, 'post.php');
$template->data['destination'] = $postData['url'];
$template->data['post'] = $postData['post'];
$template->show();
exit(0);