quiz MDL-10128 popup checker no longer requests a non-existent file which was causing...

[moodle.git] / mod / forum / subscribe.php

<?php

//  Subscribe to or unsubscribe from a forum.

require_once("../../config.php");
require_once("lib.php");

$id = required_param('id',PARAM_INT);      // The forum to subscribe or unsubscribe to
$force = optional_param('force','',PARAM_ALPHA);  // Force everyone to be subscribed to this forum?
$user = optional_param('user',0,PARAM_INT);

$url = new moodle_url($CFG->wwwroot.'/mod/forum/subscribe.php', array('id'=>$id));
if ($force !== '') {
    $url->param('force', $force);
}
if ($user !== 0) {
    $url->param('user', $user);
}
$PAGE->set_url($url);

if (! $forum = $DB->get_record("forum", array("id" => $id))) {
    print_error('invalidforumid', 'forum');
}

if (! $course = $DB->get_record("course", array("id" => $forum->course))) {
    print_error('invalidcoursemodule');
}

if ($cm = get_coursemodule_from_instance("forum", $forum->id, $course->id)) {
    $context = get_context_instance(CONTEXT_MODULE, $cm->id);
} else {
    $cm->id = 0;
    $context = get_context_instance(CONTEXT_MODULE, $cm->id);
}

if ($user) {
    if (!has_capability('mod/forum:managesubscriptions', $context)) {
        print_error('nopermissiontosubscribe', 'forum');
    }
    if (!$user = $DB->get_record("user", array("id" => $user))) {
        print_error('invaliduserid');
    }
} 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->id, false, $cm);

if (has_capability('moodle/legacy:guest', get_context_instance(CONTEXT_SYSTEM), 0, false)) {   // Guests can't subscribe
    $PAGE->set_title($course->shortname);
    $PAGE->set_heading($course->fullname);
    echo $OUTPUT->header();
    echo $OUTPUT->confirm(get_string('noguestsubscribe', 'forum').'<br /><br />'.get_string('liketologin'),
                 get_login_url(), new moodle_url());
    echo $OUTPUT->footer();
    exit;
}

$returnto = optional_param('backtoindex',0,PARAM_INT)
    ? "index.php?id=".$course->id
    : "view.php?f=$id";

if ($force and has_capability('mod/forum:managesubscriptions', $context)) {
    if (forum_is_forcesubscribed($forum)) {
        forum_forcesubscribe($forum->id, 0);
        redirect($returnto, get_string("everyonecannowchoose", "forum"), 1);
    } else {
        forum_forcesubscribe($forum->id, 1);
        redirect($returnto, get_string("everyoneisnowsubscribed", "forum"), 1);
    }
}

if (forum_is_forcesubscribed($forum)) {
    redirect($returnto, get_string("everyoneisnowsubscribed", "forum"), 1);
}

$info->name  = fullname($user);
$info->forum = format_string($forum->name);

if (forum_is_subscribed($user->id, $forum->id)) {
    if (forum_unsubscribe($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('cannotsubscribe', 'forum', $_SERVER["HTTP_REFERER"]);
    }
    if (forum_subscribe($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);
    } else {
        print_error('cannotsubscribe', 'forum', $_SERVER["HTTP_REFERER"]);
    }
}