ltiauth.php

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<?php

declare(strict_types=1);

chdir("../../");

if (strtoupper($_SERVER['REQUEST_METHOD']) == 'POST') {
    $orig = new ArrayObject($_POST);
    $data = $orig->getArrayCopy();
} elseif (strtoupper($_SERVER['REQUEST_METHOD']) == 'GET') {
    $orig = new ArrayObject($_GET);
    $data = $orig->getArrayCopy();
    // early removing client_id from $_GET
    // otherwise the client_id is interpreted as ILIAS client_id
    // and client.ini.php will not be found
    if (isset($_GET['client_id'])) {
        unset($_GET['client_id']);
    }
} else {
    header($_SERVER["SERVER_PROTOCOL"] . " 405 Method Not Allowed", true, 405);
    exit;
}

require_once("Services/Init/classes/class.ilInitialisation.php");

ilInitialisation::initILIAS();

global $DIC;

$ltiMessageHint = $data['lti_message_hint'];

if (empty($ltiMessageHint)) {
    $DIC->http()->saveResponse(
        $DIC->http()->response()
        ->withStatus(400)
    );
    try {
        $DIC->http()->sendResponse();
        $DIC->http()->close();
    } catch (\ILIAS\HTTP\Response\Sender\ResponseSendingException $e) {
        $DIC->http()->close();
    }
}
$mh = explode(":", $ltiMessageHint);
$isContentSelection = false;
$ref_id = '';
$client_id = '';
$redirect_uri = '';
if (count($mh) == 2) { // launch message auth
    list($ref_id, $client_id) = explode(":", $ltiMessageHint);
} else { // contentSelection message auth
    $isContentSelection = true;
    list($ref_id, $client_id, $redirect_uri) = explode(":", $ltiMessageHint);
}

ilSession::set('lti13_login_data', $data);
if ($isContentSelection) {
    $url = "../../" . base64_decode($redirect_uri);
} else {
    $url = "../../goto.php?target=lti_" . $ref_id . "&client_id=" . $client_id;
}

$DIC->http()->saveResponse(
    $DIC->http()->response()
    ->withStatus(302)
    ->withAddedHeader('Location', $url)
);
try {
    $DIC->http()->sendResponse();
    $DIC->http()->close();
} catch (\ILIAS\HTTP\Response\Sender\ResponseSendingException $e) {
    $DIC->http()->close();
}