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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/>.
/**
* Blog RSS Management
*
* @package core_blog
* @category rss
* @copyright 2010 Andrew Davis
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die();
require_once($CFG->dirroot.'/lib/rsslib.php');
require_once($CFG->dirroot .'/blog/lib.php');
/**
* Build the URL for the RSS feed
*
* @param int $contextid The context under which the URL should be created
* @param int $userid The id of the user requesting the RSS Feed
* @param string $filtertype The source of the RSS feed (site/course/group/user)
* @param int $filterselect The id of the item defined by $filtertype
* @param int $tagid The id of the row in the tag table that identifies the RSS Feed
* @return string
*/
function blog_rss_get_url($contextid, $userid, $filtertype, $filterselect = 0, $tagid = 0) {
$componentname = 'blog';
$additionalargs = null;
switch ($filtertype) {
case 'site':
$additionalargs = 'site/'.SITEID;
break;
case 'course':
$additionalargs = 'course/'.$filterselect;
break;
case 'group':
$additionalargs = 'group/'.$filterselect;
break;
case 'user':
$additionalargs = 'user/'.$filterselect;
break;
}
if ($tagid) {
$additionalargs .= '/'.$tagid;
}
return rss_get_url($contextid, $userid, $componentname, $additionalargs);
}
/**
* Print the link for the RSS feed with the correct RSS icon (Theme based)
*
* @param stdClass $context The context under which the URL should be created
* @param string $filtertype The source of the RSS feed (site/course/group/user)
* @param int $filterselect The id of the item defined by $filtertype
* @param int $tagid The id of the row in the tag table that identifies the RSS Feed
* @param string $tooltiptext The tooltip to be displayed with the link
*/
function blog_rss_print_link($context, $filtertype, $filterselect = 0, $tagid = 0, $tooltiptext = '') {
global $CFG, $USER, $OUTPUT;
if (!isloggedin()) {
$userid = $CFG->siteguest;
} else {
$userid = $USER->id;
}
$url = blog_rss_get_url($context->id, $userid, $filtertype, $filterselect, $tagid);
$rsspix = $OUTPUT->pix_icon('i/rss', get_string('rss'), 'core', array('title' => $tooltiptext));
print '<div class="float-sm-right"><a href="'. $url .'">' . $rsspix . '</a></div>';
}
/**
* Build the URL for the RSS feed amd add it as a header
*
* @param stdClass $context The context under which the URL should be created
* @param string $title Name for the link to be added to the page header
* @param string $filtertype The source of the RSS feed (site/course/group/user)
* @param int $filterselect The id of the item defined by $filtertype
* @param int $tagid The id of the row in the tag table that identifies the RSS Feed
*/
function blog_rss_add_http_header($context, $title, $filtertype, $filterselect = 0, $tagid = 0) {
global $PAGE, $USER, $CFG;
if (!isloggedin()) {
$userid = $CFG->siteguest;
} else {
$userid = $USER->id;
}
$rsspath = blog_rss_get_url($context->id, $userid, $filtertype, $filterselect, $tagid);
$PAGE->add_alternate_version($title, $rsspath, 'application/rss+xml');
}
/**
* Utility function to extract parameters needed to generate RSS URLs from the blog filters
*
* @param array $filters filters for the blog
* @return array array containing the id of the user/course/group, the relevant context and the filter type: site/user/course/group
*/
function blog_rss_get_params($filters) {
$thingid = $rsscontext = $filtertype = null;
$sitecontext = context_system::instance();
if (!$filters) {
$thingid = SITEID;
$filtertype = 'site';
} else if (array_key_exists('course', $filters)) {
$thingid = $filters['course'];
$filtertype = 'course';
} else if (array_key_exists('user', $filters)) {
$thingid = $filters['user'];
$filtertype = 'user';
} else if (array_key_exists('group', $filters)) {
$thingid = $filters['group'];
$filtertype = 'group';
}
return array($thingid, $rsscontext, $filtertype);
}
/**
* Generate any blog RSS feed via one function
*
* @param stdClass $context The context of the blog for which the feed it being generated
* @param array $args An array of arguements needed to build the feed (contextid, token, componentname, type, id, tagid)
*/
function blog_rss_get_feed($context, $args) {
global $CFG, $SITE, $DB;
if (empty($CFG->enableblogs)) {
debugging('Blogging disabled on this site, RSS feeds are not available');
return null;
}
if (empty($CFG->enablerssfeeds)) {
debugging('Sorry, RSS feeds are disabled on this site');
return '';
}
if ($CFG->bloglevel == BLOG_SITE_LEVEL) {
if (isguestuser()) {
debugging(get_string('nopermissiontoshow', 'error'));
return '';
}
}
$sitecontext = context_system::instance();
if (!has_capability('moodle/blog:view', $sitecontext)) {
return null;
}
$type = clean_param($args[3], PARAM_ALPHA);
$id = clean_param($args[4], PARAM_INT); // Could be groupid / courseid / userid depending on $type.
$tagid = 0;
if ($args[5] != 'rss.xml') {
$tagid = clean_param($args[5], PARAM_INT);
} else {
$tagid = 0;
}
$filename = blog_rss_file_name($type, $id, $tagid);
if (file_exists($filename)) {
if (filemtime($filename) + 3600 > time()) {
return $filename; // It's already done so we return cached version.
}
}
$courseid = $groupid = $userid = null;
switch ($type) {
case 'site':
break;
case 'course':
$courseid = $id;
break;
case 'group':
$groupid = $id;
break;
case 'user':
$userid = $id;
break;
}
// Get all the entries from the database.
require_once($CFG->dirroot .'/blog/locallib.php');
$blogheaders = blog_get_headers($courseid, $groupid, $userid, $tagid);
$bloglisting = new blog_listing($blogheaders['filters']);
$blogentries = $bloglisting->get_entries();
// Now generate an array of RSS items.
if ($blogentries) {
$items = array();
foreach ($blogentries as $blogentry) {
$item = new stdClass();
$item->author = fullname($DB->get_record('user', array('id' => $blogentry->userid))); // TODO: this is slow.
$item->title = $blogentry->subject;
$item->pubdate = $blogentry->lastmodified;
$item->link = $CFG->wwwroot.'/blog/index.php?entryid='.$blogentry->id;
$summary = file_rewrite_pluginfile_urls($blogentry->summary, 'pluginfile.php',
$sitecontext->id, 'blog', 'post', $blogentry->id);
$item->description = format_text($summary, $blogentry->format);
if ($blogtags = core_tag_tag::get_item_tags_array('core', 'post', $blogentry->id)) {
$item->tags = $blogtags;
$item->tagscheme = $CFG->wwwroot . '/tag';
}
$items[] = $item;
}
$articles = rss_add_items($items); // Change structure to XML.
} else {
$articles = '';
}
// Get header and footer information.
switch ($type) {
case 'user':
$info = fullname($DB->get_record('user', array('id' => $id), get_all_user_name_fields(true)));
break;
case 'course':
$info = $DB->get_field('course', 'fullname', array('id' => $id));
$info = format_string($info, true, array('context' => context_course::instance($id)));
break;
case 'site':
$info = format_string($SITE->fullname, true, array('context' => context_course::instance(SITEID)));
break;
case 'group':
$group = groups_get_group($id);
$info = $group->name; // TODO: $DB->get_field('groups', 'name', array('id' => $id)).
break;
default:
$info = '';
break;
}
if ($tagid) {
$info .= ': '.$DB->get_field('tags', 'text', array('id' => $tagid));
}
$header = rss_standard_header(get_string($type.'blog', 'blog', $info),
$CFG->wwwroot.'/blog/index.php',
get_string('intro', 'blog'));
$footer = rss_standard_footer();
// Save the XML contents to file.
$rssdata = $header.$articles.$footer;
if (blog_rss_save_file($type, $id, $tagid, $rssdata)) {
return $filename;
} else {
return false; // Couldn't find it or make it.
}
}
/**
* Retrieve the location and file name of a cached RSS feed
*
* @param string $type The source of the RSS feed (site/course/group/user)
* @param int $id The id of the item defined by $type
* @param int $tagid The id of the row in the tag table that identifies the RSS Feed
* @return string
*/
function blog_rss_file_name($type, $id, $tagid = 0) {
global $CFG;
if ($tagid) {
return "$CFG->cachedir/rss/blog/$type/$id/$tagid.xml";
} else {
return "$CFG->cachedir/rss/blog/$type/$id.xml";
}
}
/**
* This function saves to file the rss feed specified in the parameters
*
* @param string $type The source of the RSS feed (site/course/group/user)
* @param int $id The id of the item defined by $type
* @param int $tagid The id of the row in the tag table that identifies the RSS Feed
* @param string $contents The contents of the RSS Feed file
* @return bool whether the save was successful or not
*/
function blog_rss_save_file($type, $id, $tagid = 0, $contents = '') {
global $CFG;
$status = true;
// Blog creates some additional dirs within the rss cache so make sure they all exist.
make_cache_directory('rss/blog');
make_cache_directory('rss/blog/'.$type);
$filename = blog_rss_file_name($type, $id, $tagid);
$expandfilename = false; // We are supplying a full file path.
$status = rss_save_file('blog', $filename, $contents, $expandfilename);
return $status;
}
/**
* Delete the supplied user's cached blog post RSS feed.
* Only user blogs are available by RSS.
* This doesn't call rss_delete_file() as blog RSS caching uses it's own file structure.
*
* @param int $userid
*/
function blog_rss_delete_file($userid) {
$filename = blog_rss_file_name('user', $userid);
if (file_exists($filename)) {
unlink($filename);
}
}