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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle 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 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* Subscribe to or unsubscribe from a forum or manage forum subscription mode
*
* This script can be used by either individual users to subscribe to or
* unsubscribe from a forum (no 'mode' param provided), or by forum managers
* to control the subscription mode (by 'mode' param).
* This script can be called from a link in email so the sesskey is not
* required parameter. However, if sesskey is missing, the user has to go
* through a confirmation page that redirects the user back with the
* sesskey.
*
* @package mod
* @subpackage forum
* @copyright 1999 onwards Martin Dougiamas {@link http://moodle.com}
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
require_once(dirname(dirname(dirname(__FILE__))).'/config.php');
require_once($CFG->dirroot.'/mod/forum/lib.php');
$id = required_param('id', PARAM_INT); // the forum to subscribe or unsubscribe to
$mode = optional_param('mode', null, PARAM_INT); // the forum's subscription mode
$user = optional_param('user', 0, PARAM_INT); // userid of the user to subscribe, defaults to $USER
$sesskey = optional_param('sesskey', null, PARAM_RAW); // sesskey
$url = new moodle_url('/mod/forum/subscribe.php', array('id'=>$id));
if (!is_null($mode)) {
$url->param('mode', $mode);
}
if ($user !== 0) {
$url->param('user', $user);
}
if (!is_null($sesskey)) {
$url->param('sesskey', $sesskey);
}
$PAGE->set_url($url);
$forum = $DB->get_record('forum', array('id' => $id), '*', MUST_EXIST);
$course = $DB->get_record('course', array('id' => $forum->course), '*', MUST_EXIST);
$cm = get_coursemodule_from_instance('forum', $forum->id, $course->id, false, MUST_EXIST);
$context = get_context_instance(CONTEXT_MODULE, $cm->id);
if ($user) {
require_sesskey();
if (!has_capability('mod/forum:managesubscriptions', $context)) {
print_error('nopermissiontosubscribe', 'forum');
}
$user = $DB->get_record('user', array('id' => $user), '*', MUST_EXIST);
} else {
$user = $USER;
}
if (isset($cm->groupmode) && empty($course->groupmodeforce)) {
$groupmode = $cm->groupmode;
} else {
$groupmode = $course->groupmode;
}
if ($groupmode && !forum_is_subscribed($user->id, $forum) && !has_capability('moodle/site:accessallgroups', $context)) {
if (!groups_get_all_groups($course->id, $USER->id)) {
print_error('cannotsubscribe', 'forum');
}
}
require_login($course, false, $cm);
if (is_null($mode) and !is_enrolled($context, $USER, '', true)) { // Guests and visitors can't subscribe - only enrolled
$PAGE->set_title($course->shortname);
$PAGE->set_heading($course->fullname);
if (isguestuser()) {
echo $OUTPUT->header();
echo $OUTPUT->confirm(get_string('subscribeenrolledonly', 'forum').'<br /><br />'.get_string('liketologin'),
get_login_url(), new moodle_url('/mod/forum/view.php', array('f'=>$id)));
echo $OUTPUT->footer();
exit;
} else {
// there should not be any links leading to this place, just redirect
redirect(new moodle_url('/mod/forum/view.php', array('f'=>$id)), get_string('subscribeenrolledonly', 'forum'));
}
}
$returnto = optional_param('backtoindex',0,PARAM_INT)
? "index.php?id=".$course->id
: "view.php?f=$id";
if (!is_null($mode) and has_capability('mod/forum:managesubscriptions', $context)) {
require_sesskey();
switch ($mode) {
case FORUM_CHOOSESUBSCRIBE : // 0
forum_forcesubscribe($forum->id, FORUM_CHOOSESUBSCRIBE);
redirect($returnto, get_string("everyonecannowchoose", "forum"), 1);
break;
case FORUM_FORCESUBSCRIBE : // 1
forum_forcesubscribe($forum->id, FORUM_FORCESUBSCRIBE);
redirect($returnto, get_string("everyoneisnowsubscribed", "forum"), 1);
break;
case FORUM_INITIALSUBSCRIBE : // 2
if ($forum->forcesubscribe <> FORUM_INITIALSUBSCRIBE) {
$users = forum_get_potential_subscribers($context, 0, 'u.id, u.email', '');
foreach ($users as $user) {
forum_subscribe($user->id, $forum->id);
}
}
forum_forcesubscribe($forum->id, FORUM_INITIALSUBSCRIBE);
redirect($returnto, get_string("everyoneisnowsubscribed", "forum"), 1);
break;
case FORUM_DISALLOWSUBSCRIBE : // 3
forum_forcesubscribe($forum->id, FORUM_DISALLOWSUBSCRIBE);
redirect($returnto, get_string("noonecansubscribenow", "forum"), 1);
break;
default:
print_error(get_string('invalidforcesubscribe', 'forum'));
}
}
if (forum_is_forcesubscribed($forum)) {
redirect($returnto, get_string("everyoneisnowsubscribed", "forum"), 1);
}
$info = new stdClass();
$info->name = fullname($user);
$info->forum = format_string($forum->name);
if (forum_is_subscribed($user->id, $forum->id)) {
if (is_null($sesskey)) { // we came here via link in email
$PAGE->set_title($course->shortname);
$PAGE->set_heading($course->fullname);
echo $OUTPUT->header();
echo $OUTPUT->confirm(get_string('confirmunsubscribe', 'forum', format_string($forum->name)),
new moodle_url($PAGE->url, array('sesskey' => sesskey())), new moodle_url('/mod/forum/view.php', array('f' => $id)));
echo $OUTPUT->footer();
exit;
}
require_sesskey();
if (forum_unsubscribe($user->id, $forum->id)) {
add_to_log($course->id, "forum", "unsubscribe", "view.php?f=$forum->id", $forum->id, $cm->id);
redirect($returnto, get_string("nownotsubscribed", "forum", $info), 1);
} else {
print_error('cannotunsubscribe', 'forum', $_SERVER["HTTP_REFERER"]);
}
} else { // subscribe
if ($forum->forcesubscribe == FORUM_DISALLOWSUBSCRIBE &&
!has_capability('mod/forum:managesubscriptions', $context)) {
print_error('disallowsubscribe', 'forum', $_SERVER["HTTP_REFERER"]);
}
if (!has_capability('mod/forum:viewdiscussion', $context)) {
print_error('noviewdiscussionspermission', 'forum', $_SERVER["HTTP_REFERER"]);
}
if (is_null($sesskey)) { // we came here via link in email
$PAGE->set_title($course->shortname);
$PAGE->set_heading($course->fullname);
echo $OUTPUT->header();
echo $OUTPUT->confirm(get_string('confirmsubscribe', 'forum', format_string($forum->name)),
new moodle_url($PAGE->url, array('sesskey' => sesskey())), new moodle_url('/mod/forum/view.php', array('f' => $id)));
echo $OUTPUT->footer();
exit;
}
require_sesskey();
forum_subscribe($user->id, $forum->id);
add_to_log($course->id, "forum", "subscribe", "view.php?f=$forum->id", $forum->id, $cm->id);
redirect($returnto, get_string("nowsubscribed", "forum", $info), 1);
}
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