. /** * Subscribe to or unsubscribe from a forum discussion. * * @package mod_forum * @copyright 2014 Andrew Nicols * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later */ define('AJAX_SCRIPT', true); require_once(dirname(dirname(__DIR__)) . '/config.php'); require_once($CFG->dirroot . '/mod/forum/lib.php'); $forumid = required_param('forumid', PARAM_INT); // The forum to subscribe or unsubscribe. $discussionid = optional_param('discussionid', null, PARAM_INT); // The discussionid to subscribe. $includetext = optional_param('includetext', false, PARAM_BOOL); $forum = $DB->get_record('forum', array('id' => $forumid), '*', MUST_EXIST); $course = $DB->get_record('course', array('id' => $forum->course), '*', MUST_EXIST); $discussion = $DB->get_record('forum_discussions', array('id' => $discussionid), '*', MUST_EXIST); $cm = get_coursemodule_from_instance('forum', $forum->id, $course->id, false, MUST_EXIST); $context = context_module::instance($cm->id); require_sesskey(); require_login($course, false, $cm); require_capability('mod/forum:viewdiscussion', $context); $return = new stdClass(); if (is_guest($context, $USER)) { // is_guest should be used here as this also checks whether the user is a guest in the current course. // Guests and visitors cannot subscribe - only enrolled users. throw new moodle_exception('noguestsubscribe', 'mod_forum'); } if (!\mod_forum\subscriptions::is_subscribable($forum)) { // Nothing to do. We won't actually output any content here though. echo json_encode($return); die; } if (\mod_forum\subscriptions::is_subscribed($USER->id, $forum, $discussion->id, $cm)) { // The user is subscribed, unsubscribe them. \mod_forum\subscriptions::unsubscribe_user_from_discussion($USER->id, $discussion, $context); } else { // The user is unsubscribed, subscribe them. \mod_forum\subscriptions::subscribe_user_to_discussion($USER->id, $discussion, $context); } // Now return the updated subscription icon. $return->icon = forum_get_discussion_subscription_icon($forum, $discussion->id, null, $includetext); echo json_encode($return); die;