/**
* Returns the path to the cached rss feed contents. Creates/updates the cache if necessary.
* @param stdClass $context the context
* @param array $args the arguments received in the url
* @return string the full path to the cached RSS feed directory. Null if there is a problem.
*/
function forum_rss_get_feed($context, $args) {
global $CFG, $DB, $USER;
$status = true;
//are RSS feeds enabled?
if (empty($CFG->forum_enablerssfeeds)) {
debugging('DISABLED (module configuration)');
return null;
}
$forumid = clean_param($args[3], PARAM_INT);
$cm = get_coursemodule_from_instance('forum', $forumid, 0, false, MUST_EXIST);
$modcontext = context_module::instance($cm->id);
//context id from db should match the submitted one
if ($context->id != $modcontext->id || !has_capability('mod/forum:viewdiscussion', $modcontext)) {
return null;
}
$forum = $DB->get_record('forum', array('id' => $forumid), '*', MUST_EXIST);
if (!rss_enabled_for_mod('forum', $forum)) {
return null;
}
//the sql that will retreive the data for the feed and be hashed to get the cache filename
list($sql, $params) = forum_rss_get_sql($forum, $cm);
// Hash the sql to get the cache file name.
$filename = rss_get_file_name($forum, $sql, $params);
$cachedfilepath = rss_get_file_full_name('mod_forum', $filename);
//Is the cache out of date?
$cachedfilelastmodified = 0;
if (file_exists($cachedfilepath)) {
$cachedfilelastmodified = filemtime($cachedfilepath);
}
// Used to determine if we need to generate a new RSS feed.
$dontrecheckcutoff = time() - 60; // Sixty seconds ago.
// If it hasn't been generated we need to create it.
// Otherwise, if it has been > 60 seconds since we last updated, check for new items.
if (($cachedfilelastmodified == 0) || (($dontrecheckcutoff > $cachedfilelastmodified) &&
forum_rss_newstuff($forum, $cm, $cachedfilelastmodified))) {
// Need to regenerate the cached version.
$result = forum_rss_feed_contents($forum, $sql, $params, $modcontext);
$status = rss_save_file('mod_forum', $filename, $result);
}
//return the path to the cached version
return $cachedfilepath;
}
/**
* Returns the path to the cached rss feed contents. Creates/updates the cache if necessary.
* @param stdClass $context the context
* @param array $args the arguments received in the url
* @return string the full path to the cached RSS feed directory. Null if there is a problem.
*/
function forum_rss_get_feed($context, $args) {
global $CFG, $DB;
$status = true;
//are RSS feeds enabled?
if (empty($CFG->forum_enablerssfeeds)) {
debugging('DISABLED (module configuration)');
return null;
}
$forumid = clean_param($args[3], PARAM_INT);
$cm = get_coursemodule_from_instance('forum', $forumid, 0, false, MUST_EXIST);
if ($cm) {
$modcontext = get_context_instance(CONTEXT_MODULE, $cm->id);
//context id from db should match the submitted one
if ($context->id != $modcontext->id || !has_capability('mod/forum:viewdiscussion', $modcontext)) {
return null;
}
}
$forum = $DB->get_record('forum', array('id' => $forumid), '*', MUST_EXIST);
if (!rss_enabled_for_mod('forum', $forum)) {
return null;
}
//the sql that will retreive the data for the feed and be hashed to get the cache filename
$sql = forum_rss_get_sql($forum, $cm);
//hash the sql to get the cache file name
$filename = rss_get_file_name($forum, $sql);
$cachedfilepath = rss_get_file_full_name('mod_forum', $filename);
//Is the cache out of date?
$cachedfilelastmodified = 0;
if (file_exists($cachedfilepath)) {
$cachedfilelastmodified = filemtime($cachedfilepath);
}
//if the cache is more than 60 seconds old and there's new stuff
$dontrecheckcutoff = time()-60;
if ( $dontrecheckcutoff > $cachedfilelastmodified && forum_rss_newstuff($forum, $cm, $cachedfilelastmodified)) {
//need to regenerate the cached version
$result = forum_rss_feed_contents($forum, $sql);
if (!empty($result)) {
$status = rss_save_file('mod_forum',$filename,$result);
}
}
//return the path to the cached version
return $cachedfilepath;
}
