/
subscribe.php
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/
subscribe.php
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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/>.
/**
* Library of interface functions and constants for module pcast
*
* This file is used to generate and serve the .pcast file which is used
* by iTunes to subscribe to the RSS feed
*
* @package mod_pcast
* @copyright 2010 Stephen Bourget
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
// Disable moodle specific debug messages and any errors in output.
// Comment this out to see any error messages during RSS generation.
define('NO_DEBUG_DISPLAY', true);
// Sessions not used here, we recreate $USER every time we are called.
define('NO_MOODLE_COOKIES', true);
require_once('../../config.php');
require_once($CFG->libdir.'/filelib.php');
require_once($CFG->libdir.'/rsslib.php');
require_once($CFG->dirroot.'/mod/pcast/rsslib.php');
$pcastconfig = get_config('mod_pcast');
// RSS feeds must be enabled site-wide.
if (empty($CFG->enablerssfeeds)) {
debugging('DISABLED (admin variables)');
pcast_rss_error();
}
// RSS must be enabled for the module.
if (empty($pcastconfig->enablerssfeeds)) {
debugging("DISABLED (module configuration)");
pcast_rss_error();
}
// All the arguments are in the path.
$relativepath = get_file_argument();
if (!$relativepath) {
pcast_rss_error();
}
// Extract relative path components into variables.
$args = explode('/', trim($relativepath, '/'));
if (count($args) < 5) {
pcast_rss_error();
}
// Validate the feed.
$contextid = (int)$args[0];
$token = clean_param($args[1], PARAM_ALPHANUM);
$componentname = clean_param($args[2], PARAM_FILE);
$pcastid = clean_param($args[3], PARAM_INT);
$groupid = clean_param($args[4], PARAM_INT);
$uservalidated = false;
// Authenticate the user from the token.
$userid = rss_get_userid_from_token($token);
if (!$userid) {
pcast_rss_error('rsserrorauth');
}
$user = get_complete_user_data('id', $userid);
\core\session\manager::set_user($user); // For login and capability checks.
// Check the context actually exists.
list($context, $course, $cm) = get_context_info_array($contextid);
if (!$context) {
pcast_rss_error();
}
try {
$autologinguest = true;
$setwantsurltome = true;
$preventredirect = true;
require_course_login($course, $autologinguest, $cm, $setwantsurltome, $preventredirect);
} catch (Exception $e) {
if (isguestuser()) {
pcast_rss_error('rsserrorguest');
} else {
pcast_rss_error('rsserrorauth');
}
}
// Now that we know that the user is vaid, lets generate see if they can see the feed.
// Check capabilities.
$cm = get_coursemodule_from_instance('pcast', $pcastid, 0, false, MUST_EXIST);
if ($cm) {
$modcontext = context_module::instance($cm->id);
// Context id from db should match the submitted one.
if ($context->id == $modcontext->id && has_capability('mod/pcast:view', $modcontext)) {
$uservalidated = true;
}
}
// Check group mode 0/1/2 (All participants).
$groupmode = groups_get_activity_groupmode($cm);
// Using Groups, check to see if user should see all participants.
if ($groupmode == SEPARATEGROUPS) {
// User must have the capability to see all groups or be a member of that group.
$members = get_enrolled_users($context, 'mod/pcast:write', $groupid, 'u.id', 'u.id ASC');
// Is a member of the current group.
if (!isset($members[$userid]->id) || ($members[$userid]->id != $userid)) {
// Not a member of the group, can you see all groups (from CAPS).
if (!has_capability('moodle/site:accessallgroups', $context, $userid)) {
$uservalidated = false;
}
} else {
// Are a member of the current group.
// Is the group #0 (Group 0 is all users).
if ($groupid == 0 && !has_capability('moodle/site:accessallgroups', $context, $userid)) {
$uservalidated = false;
}
}
}
if (!$uservalidated) {
pcast_rss_error('rsserrorauth');
}
// OK, the use should be able to see the feed, generate the .pcast file.
$pcast = $DB->get_record('pcast', array('id' => $pcastid), '*', MUST_EXIST);
// Check to se if RSS is enabled.
// NOTE: cannot use the rss_enabled_for_mod() function due to the functions internals and naming conflicts.
if (($pcast->rssepisodes == 0)||(empty($pcast->rssepisodes))) {
pcast_rss_error();
}
$sql = pcast_rss_get_sql($pcast);
$filename = rss_get_file_name($pcast, $sql);
// Append the GroupID to the end of the filename.
$filename .= '_'.$groupid;
$cachedfilepath = pcast_rss_get_file_full_name('mod_pcast', $filename);
// Figure out the URL for the podcast based on the user info.
$args = $pcast->id . '/' .$groupid;
$url = new moodle_url(rss_get_url($context->id, $userid, 'pcast', $args));
// Build the .pcast file.
$rss = pcast_build_pcast_file($pcast, $url);
// Save the XML contents to file.
$status = pcast_rss_save_file('mod_pcast', $filename, $rss);
if (!$status) {
$cachedfilepath = null;
}
// Check that file exists.
if (empty($cachedfilepath) || !file_exists($cachedfilepath)) {
die($cachedfilepath);
pcast_rss_error();
}
// Send the .pcast file to the user!
send_file($cachedfilepath, 'rss.pcast', 0, 0, 0, 1); // DO NOT CACHE.