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<?php
/**
* lti.php - LTI 1.1 single sign on controller
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* @author Elmar Ludwig
* @license http://www.gnu.org/licenses/gpl-2.0.html GPL version 2
* @category Stud.IP
*/
class LtiController extends AuthenticatedController
{
/**
* Callback function being called before an action is executed.
*/
public function before_filter(&$action, &$args)
{
// enforce LTI SSO login
Request::set('sso', 'lti');
parent::before_filter($action, $args);
}
/**
* Redirect to enrollment action for the given course, if needed.
*/
public function index_action($course_id = null)
{
$course_id = Request::option('custom_cid', $course_id);
$course_id = Request::option('custom_course', $course_id);
$message_type = Request::option('lti_message_type');
if ($message_type === 'ContentItemSelectionRequest') {
$_SESSION['ContentItemSelection'] = [
'oauth_consumer_key' => Request::get('oauth_consumer_key'),
'content_item_return_url' => Request::get('content_item_return_url'),
'document_targets' => Request::get('accept_presentation_document_targets'),
'data' => Request::get('data')
];
$this->redirect('lti/content_item');
} else if ($course_id) {
$this->redirect('course/enrolment/apply/' . $course_id);
} else {
$this->redirect('start');
}
}
/**
* Select course for ContentItemSelectionRequest message.
*/
public function content_item_action()
{
PageLayout::setTitle(_('Veranstaltung verknüpfen'));
Navigation::activateItem('/browse/my_courses/content_item');
$this->document_targets = $_SESSION['ContentItemSelection']['document_targets'];
$this->target_labels = [
'embed' => _('in Seite einbetten'),
'frame' => _('gleiches Fenster oder Tab'),
'iframe' => _('IFrame in der Seite'),
'window' => _('neues Fenster oder Tab'),
'popup' => _('Popup-Fenster'),
'overlay' => _('Dialog'),
'none' => _('nicht anzeigen')
];
$sql = "JOIN seminar_user USING(Seminar_id)
LEFT JOIN semester_courses sc ON seminare.seminar_id = sc.course_id
LEFT JOIN semester_data s USING (semester_id)
WHERE user_id = ? AND seminar_user.status IN ('dozent', 'tutor')
ORDER BY s.beginn DESC, Name";
$this->courses = Course::findBySQL($sql, [$GLOBALS['user']->id]);
}
/**
* Return the selected content item to the LTI consumer.
*/
public function link_content_item_action()
{
CSRFProtection::verifyUnsafeRequest();
$course_id = Request::option('course_id');
$target = Request::option('target');
$course = Course::find($course_id);
$consumer_key = $_SESSION['ContentItemSelection']['oauth_consumer_key'];
$return_url = $_SESSION['ContentItemSelection']['content_item_return_url'];
$data = $_SESSION['ContentItemSelection']['data'];
unset($_SESSION['ContentItemSelection']);
$consumer_config = $GLOBALS['STUDIP_AUTH_CONFIG_LTI']['consumer_keys'][$consumer_key];
$consumer_secret = $consumer_config['consumer_secret'];
$signature_method = $consumer_config['signature_method'] ?? 'sha1';
$content_items = [
'@context' => 'http://purl.imsglobal.org/ctx/lti/v1/ContentItem',
'@graph' => []
];
if (Request::submitted('link')) {
$content_items['@graph'][] = [
'@type' => 'LtiLinkItem',
'mediaType' => 'application/vnd.ims.lti.v1.ltilink',
'title' => $course->name,
'text' => $course->beschreibung,
'placementAdvice' => ['presentationDocumentTarget' => $target],
'custom' => ['course' => $course_id]
];
}
// set up ContentItemSelection
$lti_link = new LtiLink($return_url, $consumer_key, $consumer_secret, $signature_method);
$lti_link->addLaunchParameters([
'lti_message_type' => 'ContentItemSelection',
'content_items' => json_encode($content_items),
'data' => $data
]);
$this->launch_url = $lti_link->getLaunchURL();
$this->launch_data = $lti_link->getBasicLaunchData();
$this->signature = $lti_link->getLaunchSignature($this->launch_data);
$this->render_template('course/lti/iframe');
}
}
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