MDL-1626 mod_forum: Update user interface to reflect per-discussion subscriptions
[moodle.git] / mod / forum / subscribe_ajax.php
CommitLineData
ebfb73db
AN
1<?php
2// This file is part of Moodle - http://moodle.org/
3//
4// Moodle is free software: you can redistribute it and/or modify
5// it under the terms of the GNU General Public License as published by
6// the Free Software Foundation, either version 3 of the License, or
7// (at your option) any later version.
8//
9// Moodle is distributed in the hope that it will be useful,
10// but WITHOUT ANY WARRANTY; without even the implied warranty of
11// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12// GNU General Public License for more details.
13//
14// You should have received a copy of the GNU General Public License
15// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
16
17/**
18 * Subscribe to or unsubscribe from a forum discussion.
19 *
20 * @package mod_forum
21 * @copyright 2014 Andrew Nicols <andrew@nicols.co.uk>
22 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
23 */
24
25define('AJAX_SCRIPT', true);
26require_once(dirname(dirname(__DIR__)) . '/config.php');
27require_once($CFG->dirroot . '/mod/forum/lib.php');
28
29$forumid = required_param('forumid', PARAM_INT); // The forum to subscribe or unsubscribe.
30$discussionid = optional_param('discussionid', null, PARAM_INT); // The discussionid to subscribe.
31$sesskey = optional_param('sesskey', null, PARAM_RAW);
32
33$forum = $DB->get_record('forum', array('id' => $forumid), '*', MUST_EXIST);
34$course = $DB->get_record('course', array('id' => $forum->course), '*', MUST_EXIST);
35$discussion = $DB->get_record('forum_discussions', array('id' => $discussionid), '*', MUST_EXIST);
36$cm = get_coursemodule_from_instance('forum', $forum->id, $course->id, false, MUST_EXIST);
37$context = context_module::instance($cm->id);
38
39require_login($course, false, $cm);
40
41$return = new stdClass();
42
43if (!\mod_forum\subscriptions::is_subscribable($forum)) {
44 // Nothing to do. We won't actually output any content here though.
45 echo json_encode($return);
46 die;
47}
48
49if (\mod_forum\subscriptions::is_subscribed($USER->id, $forum, $discussion->id)) {
50 // The user is subscribed, unsubscribe them.
51 \mod_forum\subscriptions::unsubscribe_user_from_discussion($USER->id, $discussion, $context);
52} else {
53 // The user is unsubscribed, subscribe them.
54 \mod_forum\subscriptions::subscribe_user_to_discussion($USER->id, $discussion, $context);
55}
56
57// Now return the updated subscription icon.
58$return->icon = forum_get_discussion_subscription_icon($forum, $discussion->id);
59echo json_encode($return);
60die;