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