xapitoken.php

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<?php

declare(strict_types=1);

require_once __DIR__ . '/../vendor/composer/vendor/autoload.php';
$tokenRestriction = true;

$origParam = $_GET['param'];

if (!isset($origParam) || !strlen($origParam)) {
    $error = array('error-code' => 3,'error-text' => 'invalid request: missing or empty param request parameter');
    send($error);
}

try {
    $param = base64_decode(rawurldecode($origParam));

    $param = json_decode(openssl_decrypt(
        $param,
        ilCmiXapiAuthToken::OPENSSL_ENCRYPTION_METHOD,
        ilCmiXapiAuthToken::getWacSalt(),
        0,
        ilCmiXapiAuthToken::OPENSSL_IV
    ), true);

    $_COOKIE[session_name()] = $param[session_name()];

    $_COOKIE['ilClientId'] = $param['ilClientId'];
    $objId = $param['obj_id'];
    $refId = $param['ref_id'];

    ilInitialisation::initILIAS();
    $DIC = $GLOBALS['DIC'];
} catch (ilCmiXapiException $e) {
    $error = array('error-code' => '3','error-text' => 'internal server error');
    send($error);
}

try {
    $object = ilObjectFactory::getInstanceByObjId($objId, false);
    $token = ilCmiXapiAuthToken::getInstanceByObjIdAndRefIdAndUsrId($objId, $refId, $DIC->user()->getId());
    if ($object->getContentType() == ilObjCmiXapi::CONT_TYPE_CMI5) {
        $tokenCmi5Session = $token->getCmi5Session();
        $alreadyReturnedCmi5Session = $token->getReturnedForCmi5Session();
        if ($tokenCmi5Session == $alreadyReturnedCmi5Session) {
            // what about reloaded or refreshed pages?
            // see: https://stackoverflow.com/questions/456841/detect-whether-the-browser-is-refreshed-or-not-using-php/456915
            // Beware that the xapitoken request is an ajax request and not all clients send HTTP_REFERRER Header
            if ($tokenRestriction == true) {
                $error = array('error-code' => '1','error-text' => 'The authorization token has already been returned.');
                send($error);
            }
        }
        $token->setReturnedForCmi5Session($tokenCmi5Session);
        $token->update();
    }
    if ($object->isBypassProxyEnabled()) {
        $authToken = $object->getLrsType()->getBasicAuthWithoutBasic();
    } else {
        $authToken = base64_encode(CLIENT_ID . ':' . $token->getToken());
    }


    $response = array("auth-token" => $authToken);
    send($response);
} catch (ilCmiXapiException $e) {
    $error = array('error-code' => '2','error-text' => 'could not create valid session from token.');
    send($error);
}

function send($response): void
{
    if (isset($_SERVER["HTTP_ORIGIN"]) && $_SERVER["HTTP_ORIGIN"] != "") {
        header('Access-Control-Allow-Origin: ' . $_SERVER["HTTP_ORIGIN"]);
    }
    header('Access-Control-Allow-Credentials: true');
    header('Content-type:application/json;charset=utf-8');
    echo json_encode($response);
    exit;
}