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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/>./*** Core global functions for Blog.** @package moodlecore* @subpackage blog* @copyright 2009 Nicolas Connault* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later*/defined('MOODLE_INTERNAL') || die();/** Library of functions and constants for blog*/require_once($CFG->dirroot .'/blog/rsslib.php');/*** User can edit a blog entry if this is their own blog entry and they have* the capability moodle/blog:create, or if they have the capability* moodle/blog:manageentries.** This also applies to deleting of entries.*/function blog_user_can_edit_entry($blogentry) {global $USER;$sitecontext = context_system::instance();if (has_capability('moodle/blog:manageentries', $sitecontext)) {return true; // Can edit any blog entry.}if ($blogentry->userid == $USER->id && has_capability('moodle/blog:create', $sitecontext)) {return true; // Can edit own when having blog:create capability.}return false;}/*** Checks to see if a user can view the blogs of another user.* Only blog level is checked here, the capabilities are enforced* in blog/index.php*/function blog_user_can_view_user_entry($targetuserid, $blogentry=null) {global $CFG, $USER, $DB;if (empty($CFG->enableblogs)) {return false; // Blog system disabled.}if (isloggedin() && $USER->id == $targetuserid) {return true; // Can view own entries in any case.}$sitecontext = context_system::instance();if (has_capability('moodle/blog:manageentries', $sitecontext)) {return true; // Can manage all entries.}// If blog is in draft state, then make sure user have proper capability.if ($blogentry && $blogentry->publishstate == 'draft' && !has_capability('moodle/blog:viewdrafts', $sitecontext)) {return false; // Can not view draft of others.}// If blog entry is not public, make sure user is logged in.if ($blogentry && $blogentry->publishstate != 'public' && !isloggedin()) {return false;}// If blogentry is not passed or all above checks pass, then check capability based on system config.switch ($CFG->bloglevel) {case BLOG_GLOBAL_LEVEL:return true;break;case BLOG_SITE_LEVEL:if (isloggedin()) { // Not logged in viewers forbidden.return true;}return false;break;case BLOG_USER_LEVEL:default:// If user is viewing other user blog, then user should have user:readuserblogs capability.$personalcontext = context_user::instance($targetuserid);return has_capability('moodle/user:readuserblogs', $personalcontext);break;}}/*** remove all associations for the blog entries of a particular user* @param int userid - id of user whose blog associations will be deleted*/function blog_remove_associations_for_user($userid) {global $DB;throw new coding_exception('function blog_remove_associations_for_user() is not finished');/*$blogentries = blog_fetch_entries(array('user' => $userid), 'lasmodified DESC');foreach ($blogentries as $entry) {if (blog_user_can_edit_entry($entry)) {blog_remove_associations_for_entry($entry->id);}}*/}/*** remove all associations for the blog entries of a particular course* @param int courseid - id of user whose blog associations will be deleted*/function blog_remove_associations_for_course($courseid) {global $DB;$context = context_course::instance($courseid);$DB->delete_records('blog_association', array('contextid' => $context->id));}/*** Remove module associated blogs and blog tag instances.** @param int $modcontextid Module context ID.*/function blog_remove_associations_for_module($modcontextid) {global $DB;if (!empty($assocblogids = $DB->get_fieldset_select('blog_association', 'blogid','contextid = :contextid', ['contextid' => $modcontextid]))) {list($sql, $params) = $DB->get_in_or_equal($assocblogids, SQL_PARAMS_NAMED);$DB->delete_records_select('tag_instance', "itemid $sql", $params);$DB->delete_records_select('post', "id $sql AND module = :module",array_merge($params, ['module' => 'blog']));$DB->delete_records('blog_association', ['contextid' => $modcontextid]);}}/*** Given a record in the {blog_external} table, checks the blog's URL* for new entries not yet copied into Moodle.* Also attempts to identify and remove deleted blog entries** @param object $externalblog* @return boolean False if the Feed is invalid*/function blog_sync_external_entries($externalblog) {global $CFG, $DB;require_once($CFG->libdir . '/simplepie/moodle_simplepie.php');$rss = new moodle_simplepie();$rssfile = $rss->registry->create('File', array($externalblog->url));$filetest = $rss->registry->create('Locator', array($rssfile));if (!$filetest->is_feed($rssfile)) {$externalblog->failedlastsync = 1;$DB->update_record('blog_external', $externalblog);return false;} else if (!empty($externalblog->failedlastsync)) {$externalblog->failedlastsync = 0;$DB->update_record('blog_external', $externalblog);}$rss->set_feed_url($externalblog->url);$rss->init();if (empty($rss->data)) {return null;}// Used to identify blog posts that have been deleted from the source feed.$oldesttimestamp = null;$uniquehashes = array();foreach ($rss->get_items() as $entry) {// If filtertags are defined, use them to filter the entries by RSS category.if (!empty($externalblog->filtertags)) {$containsfiltertag = false;$categories = $entry->get_categories();$filtertags = explode(',', $externalblog->filtertags);$filtertags = array_map('trim', $filtertags);$filtertags = array_map('strtolower', $filtertags);if (!empty($categories)) {foreach ($categories as $category) {if (in_array(trim(strtolower($category->term)), $filtertags)) {$containsfiltertag = true;}}}if (!$containsfiltertag) {continue;}}$uniquehashes[] = $entry->get_permalink();$newentry = new stdClass();$newentry->userid = $externalblog->userid;$newentry->module = 'blog_external';$newentry->content = $externalblog->id;$newentry->uniquehash = $entry->get_permalink();$newentry->publishstate = 'site';$newentry->format = FORMAT_HTML;// Clean subject of html, just in case.$newentry->subject = clean_param($entry->get_title(), PARAM_TEXT);// Observe 128 max chars in DB.// TODO: +1 to raise this to 255.if (core_text::strlen($newentry->subject) > 128) {$newentry->subject = core_text::substr($newentry->subject, 0, 125) . '...';}$newentry->summary = $entry->get_description();// Used to decide whether to insert or update.// Uses enty permalink plus creation date if available.$existingpostconditions = array('uniquehash' => $entry->get_permalink());// Our DB doesnt allow null creation or modified timestamps so check the external blog supplied one.$entrydate = $entry->get_date('U');if (!empty($entrydate)) {$existingpostconditions['created'] = $entrydate;}// The post ID or false if post not found in DB.$postid = $DB->get_field('post', 'id', $existingpostconditions);$timestamp = null;if (empty($entrydate)) {$timestamp = time();} else {$timestamp = $entrydate;}// Only set created if its a new post so we retain the original creation timestamp if the post is edited.if ($postid === false) {$newentry->created = $timestamp;}$newentry->lastmodified = $timestamp;if (empty($oldesttimestamp) || $timestamp < $oldesttimestamp) {// Found an older post.$oldesttimestamp = $timestamp;}if (core_text::strlen($newentry->uniquehash) > 255) {// The URL for this item is too long for the field. Rather than add// the entry without the link we will skip straight over it.// RSS spec says recommended length 500, we use 255.debugging('External blog entry skipped because of oversized URL', DEBUG_DEVELOPER);continue;}if ($postid === false) {$id = $DB->insert_record('post', $newentry);// Set tags.if ($tags = core_tag_tag::get_item_tags_array('core', 'blog_external', $externalblog->id)) {core_tag_tag::set_item_tags('core', 'post', $id, context_user::instance($externalblog->userid), $tags);}} else {$newentry->id = $postid;$DB->update_record('post', $newentry);}}// Look at the posts we have in the database to check if any of them have been deleted from the feed.// Only checking posts within the time frame returned by the rss feed. Older items may have been deleted or// may just not be returned anymore. We can't tell the difference so we leave older posts alone.$sql = "SELECT id, uniquehashFROM {post}WHERE module = 'blog_external'AND " . $DB->sql_compare_text('content') . " = " . $DB->sql_compare_text(':blogid') . "AND created > :ts";$dbposts = $DB->get_records_sql($sql, array('blogid' => $externalblog->id, 'ts' => $oldesttimestamp));$todelete = array();foreach ($dbposts as $dbpost) {if ( !in_array($dbpost->uniquehash, $uniquehashes) ) {$todelete[] = $dbpost->id;}}$DB->delete_records_list('post', 'id', $todelete);$DB->update_record('blog_external', array('id' => $externalblog->id, 'timefetched' => time()));}/*** Given an external blog object, deletes all related blog entries from the post table.* NOTE: The external blog's id is saved as post.content, a field that is not oterhwise used by blog entries.* @param object $externablog*/function blog_delete_external_entries($externalblog) {global $DB;require_capability('moodle/blog:manageexternal', context_system::instance());$DB->delete_records_select('post',"module='blog_external' AND " . $DB->sql_compare_text('content') . " = ?",array($externalblog->id));}/*** This function checks that blogs are enabled, and that the user can see blogs at all* @return bool*/function blog_is_enabled_for_user() {global $CFG;return (!empty($CFG->enableblogs) && (isloggedin() || ($CFG->bloglevel == BLOG_GLOBAL_LEVEL)));}/*** This function gets all of the options available for the current user in respect* to blogs.** It loads the following if applicable:* - Module options {@see blog_get_options_for_module}* - Course options {@see blog_get_options_for_course}* - User specific options {@see blog_get_options_for_user}* - General options (BLOG_LEVEL_GLOBAL)** @param moodle_page $page The page to load for (normally $PAGE)* @param stdClass $userid Load for a specific user* @return array An array of options organised by type.*/function blog_get_all_options(moodle_page $page, stdClass $userid = null) {global $CFG, $DB, $USER;$options = array();// If blogs are enabled and the user is logged in and not a guest.if (blog_is_enabled_for_user()) {// If the context is the user then assume we want to load for the users context.if (is_null($userid) && $page->context->contextlevel == CONTEXT_USER) {$userid = $page->context->instanceid;}// Check the userid var.if (!is_null($userid) && $userid !== $USER->id) {// Load the user from the userid... it MUST EXIST throw a wobbly if it doesn't!$user = $DB->get_record('user', array('id' => $userid), '*', MUST_EXIST);} else {$user = null;}if ($CFG->useblogassociations && $page->cm !== null) {// Load for the module associated with the page.$options[CONTEXT_MODULE] = blog_get_options_for_module($page->cm, $user);} else if ($CFG->useblogassociations && $page->course->id != SITEID) {// Load the options for the course associated with the page.$options[CONTEXT_COURSE] = blog_get_options_for_course($page->course, $user);}// Get the options for the user.if ($user !== null and !isguestuser($user)) {// Load for the requested user.$options[CONTEXT_USER + 1] = blog_get_options_for_user($user);}// Load for the current user.if (isloggedin() and !isguestuser()) {$options[CONTEXT_USER] = blog_get_options_for_user();}}// If blog level is global then display a link to view all site entries.if (!empty($CFG->enableblogs)&& $CFG->bloglevel >= BLOG_GLOBAL_LEVEL&& has_capability('moodle/blog:view', context_system::instance())) {$options[CONTEXT_SYSTEM] = array('viewsite' => array('string' => get_string('viewsiteentries', 'blog'),'link' => new moodle_url('/blog/index.php')));}// Return the options.return $options;}/*** Get all of the blog options that relate to the passed user.** If no user is passed the current user is assumed.** @staticvar array $useroptions Cache so we don't have to regenerate multiple times* @param stdClass $user* @return array The array of options for the requested user*/function blog_get_options_for_user(stdClass $user=null) {global $CFG, $USER;// Cache.static $useroptions = array();$options = array();// Blogs must be enabled and the user must be logged in.if (!blog_is_enabled_for_user()) {return $options;}// Sort out the user var.if ($user === null || $user->id == $USER->id) {$user = $USER;$iscurrentuser = true;} else {$iscurrentuser = false;}// If we've already generated serve from the cache.if (array_key_exists($user->id, $useroptions)) {return $useroptions[$user->id];}$sitecontext = context_system::instance();$canview = has_capability('moodle/blog:view', $sitecontext);if (!$iscurrentuser && $canview && ($CFG->bloglevel >= BLOG_SITE_LEVEL)) {// Not the current user, but we can view and its blogs are enabled for SITE or GLOBAL.$options['userentries'] = array('string' => get_string('viewuserentries', 'blog', fullname($user)),'link' => new moodle_url('/blog/index.php', array('userid' => $user->id)));} else {// It's the current user.if ($canview) {// We can view our own blogs .... BIG surprise.$options['view'] = array('string' => get_string('blogentries', 'blog'),'link' => new moodle_url('/blog/index.php', array('userid' => $USER->id)));}if (has_capability('moodle/blog:create', $sitecontext)) {// We can add to our own blog.$options['add'] = array('string' => get_string('addnewentry', 'blog'),'link' => new moodle_url('/blog/edit.php', array('action' => 'add')));}}if ($canview && $CFG->enablerssfeeds) {$options['rss'] = array('string' => get_string('rssfeed', 'blog'),'link' => new moodle_url(rss_get_url($sitecontext->id, $USER->id, 'blog', 'user/'.$user->id)));}// Cache the options.$useroptions[$user->id] = $options;// Return the options.return $options;}/*** Get the blog options that relate to the given course for the given user.** @staticvar array $courseoptions A cache so we can save regenerating multiple times* @param stdClass $course The course to load options for* @param stdClass $user The user to load options for null == current user* @return array The array of options*/function blog_get_options_for_course(stdClass $course, stdClass $user=null) {global $CFG, $USER;// Cache.static $courseoptions = array();$options = array();// User must be logged in and blogs must be enabled.if (!blog_is_enabled_for_user()) {return $options;}// Check that the user can associate with the course.$sitecontext = context_system::instance();// Generate the cache key.$key = $course->id.':';if (!empty($user)) {$key .= $user->id;} else {$key .= $USER->id;}// Serve from the cache if we've already generated for this course.if (array_key_exists($key, $courseoptions)) {return $courseoptions[$key];}if (has_capability('moodle/blog:view', $sitecontext)) {// We can view!if ($CFG->bloglevel >= BLOG_SITE_LEVEL) {// View entries about this course.$options['courseview'] = array('string' => get_string('viewcourseblogs', 'blog'),'link' => new moodle_url('/blog/index.php', array('courseid' => $course->id)));}// View MY entries about this course.$options['courseviewmine'] = array('string' => get_string('viewmyentriesaboutcourse', 'blog'),'link' => new moodle_url('/blog/index.php', array('courseid' => $course->id, 'userid' => $USER->id)));if (!empty($user) && ($CFG->bloglevel >= BLOG_SITE_LEVEL)) {// View the provided users entries about this course.$options['courseviewuser'] = array('string' => get_string('viewentriesbyuseraboutcourse', 'blog', fullname($user)),'link' => new moodle_url('/blog/index.php', array('courseid' => $course->id, 'userid' => $user->id)));}}if (has_capability('moodle/blog:create', $sitecontext)) {// We can blog about this course.$options['courseadd'] = array('string' => get_string('blogaboutthiscourse', 'blog'),'link' => new moodle_url('/blog/edit.php', array('action' => 'add', 'courseid' => $course->id)));}// Cache the options for this course.$courseoptions[$key] = $options;// Return the options.return $options;}/*** Get the blog options relating to the given module for the given user** @staticvar array $moduleoptions Cache* @param stdClass|cm_info $module The module to get options for* @param stdClass $user The user to get options for null == currentuser* @return array*/function blog_get_options_for_module($module, $user=null) {global $CFG, $USER;// Cache.static $moduleoptions = array();$options = array();// User must be logged in, blogs must be enabled.if (!blog_is_enabled_for_user()) {return $options;}$sitecontext = context_system::instance();// Generate the cache key.$key = $module->id.':';if (!empty($user)) {$key .= $user->id;} else {$key .= $USER->id;}if (array_key_exists($key, $moduleoptions)) {// Serve from the cache so we don't have to regenerate.return $moduleoptions[$key];}if (has_capability('moodle/blog:view', $sitecontext)) {// Save correct module name for later usage.$modulename = get_string('modulename', $module->modname);// We can view!if ($CFG->bloglevel >= BLOG_SITE_LEVEL) {// View all entries about this module.$a = new stdClass;$a->type = $modulename;$options['moduleview'] = array('string' => get_string('viewallmodentries', 'blog', $a),'link' => new moodle_url('/blog/index.php', array('modid' => $module->id)));}// View MY entries about this module.$options['moduleviewmine'] = array('string' => get_string('viewmyentriesaboutmodule', 'blog', $modulename),'link' => new moodle_url('/blog/index.php', array('modid' => $module->id, 'userid' => $USER->id)));if (!empty($user) && ($CFG->bloglevel >= BLOG_SITE_LEVEL)) {// View the given users entries about this module.$a = new stdClass;$a->mod = $modulename;$a->user = fullname($user);$options['moduleviewuser'] = array('string' => get_string('blogentriesbyuseraboutmodule', 'blog', $a),'link' => new moodle_url('/blog/index.php', array('modid' => $module->id, 'userid' => $user->id)));}}if (has_capability('moodle/blog:create', $sitecontext)) {// The user can blog about this module.$options['moduleadd'] = array('string' => get_string('blogaboutthismodule', 'blog', $modulename),'link' => new moodle_url('/blog/edit.php', array('action' => 'add', 'modid' => $module->id)));}// Cache the options.$moduleoptions[$key] = $options;// Return the options.return $options;}/*** This function encapsulates all the logic behind the complex* navigation, titles and headings of the blog listing page, depending* on URL params. It looks at URL params and at the current context level.* It builds and returns an array containing:** 1. heading: The heading displayed above the blog entries* 2. stradd: The text to be used as the "Add entry" link* 3. strview: The text to be used as the "View entries" link* 4. url: The moodle_url object used as the base for add and view links* 5. filters: An array of parameters used to filter blog listings. Used by index.php and the Recent blogs block** All other variables are set directly in $PAGE** It uses the current URL to build these variables.* A number of mutually exclusive use cases are used to structure this function.** @param int $courseid course id the the blog is associated to (can be null).* @param int $groupid group id to filter blogs I can see (can be null)* @param int $userid blog author id (can be null)* @param int $tagid tag id to filter (can be null)* @param string $tag tag name to filter (can be null)* @param int $modid module id the blog is associated to (can be null).* @param int $entryid blog entry id to filter(can be null)* @param string $search string to search (can be null)* @return array*/function blog_get_headers($courseid=null, $groupid=null, $userid=null, $tagid=null, $tag=null, $modid=null, $entryid=null,$search = null) {global $CFG, $PAGE, $DB, $USER;$id = optional_param('id', null, PARAM_INT);$tag = optional_param('tag', $tag, PARAM_NOTAGS);$tagid = optional_param('tagid', $tagid, PARAM_INT);$userid = optional_param('userid', $userid, PARAM_INT);$modid = optional_param('modid', $modid, PARAM_INT);$entryid = optional_param('entryid', $entryid, PARAM_INT);$groupid = optional_param('groupid', $groupid, PARAM_INT);$courseid = optional_param('courseid', $courseid, PARAM_INT);$search = optional_param('search', $search, PARAM_RAW);$action = optional_param('action', null, PARAM_ALPHA);$confirm = optional_param('confirm', false, PARAM_BOOL);// Ignore userid when action == add.if ($action == 'add' && $userid) {unset($userid);$PAGE->url->remove_params(array('userid'));} else if ($action == 'add' && $entryid) {unset($entryid);$PAGE->url->remove_params(array('entryid'));}$headers = array('title' => '', 'heading' => '', 'cm' => null, 'filters' => array());$blogurl = new moodle_url('/blog/index.php');$headers['stradd'] = get_string('addnewentry', 'blog');$headers['strview'] = null;$site = $DB->get_record('course', array('id' => SITEID));$sitecontext = context_system::instance();// Common Lang strings.$strparticipants = get_string("participants");$strblogentries = get_string("blogentries", 'blog');// Prepare record objects as needed.if (!empty($courseid)) {$headers['filters']['course'] = $courseid;$course = $DB->get_record('course', array('id' => $courseid));}if (!empty($userid)) {$headers['filters']['user'] = $userid;$user = $DB->get_record('user', array('id' => $userid));}if (!empty($groupid)) { // The groupid always overrides courseid.$headers['filters']['group'] = $groupid;$group = $DB->get_record('groups', array('id' => $groupid));$course = $DB->get_record('course', array('id' => $group->courseid));}$PAGE->set_pagelayout('standard');// The modid always overrides courseid, so the $course object may be reset here.if (!empty($modid) && $CFG->useblogassociations) {$headers['filters']['module'] = $modid;// A groupid param may conflict with this coursemod's courseid. Ignore groupid in that case.$courseid = $DB->get_field('course_modules', 'course', array('id' => $modid));$course = $DB->get_record('course', array('id' => $courseid));$cm = $DB->get_record('course_modules', array('id' => $modid));$cm->modname = $DB->get_field('modules', 'name', array('id' => $cm->module));$cm->name = $DB->get_field($cm->modname, 'name', array('id' => $cm->instance));$a = new stdClass();$a->type = get_string('modulename', $cm->modname);$PAGE->set_cm($cm, $course);$headers['stradd'] = get_string('blogaboutthis', 'blog', $a);$headers['strview'] = get_string('viewallmodentries', 'blog', $a);}// Case 1: No entry, mod, course or user params: all site entries to be shown (filtered by search and tag/tagid)// Note: if action is set to 'add' or 'edit', we do this at the end.if (empty($entryid) && empty($modid) && empty($courseid) && empty($userid) && !in_array($action, array('edit', 'add'))) {$PAGE->navbar->add($strblogentries, $blogurl);$strsiteblog = get_string('siteblogheading', 'blog');$PAGE->set_title($strsiteblog);$PAGE->set_heading($site->fullname);$headers['heading'] = $strsiteblog;}// Case 2: only entryid is requested, ignore all other filters. courseid is used to give more contextual information.if (!empty($entryid)) {$headers['filters']['entry'] = $entryid;$sql = 'SELECT u.* FROM {user} u, {post} p WHERE p.id = ? AND p.userid = u.id';$user = $DB->get_record_sql($sql, array($entryid));$entry = $DB->get_record('post', array('id' => $entryid));$blogurl->param('userid', $user->id);if (!empty($course)) {$mycourseid = $course->id;$blogurl->param('courseid', $mycourseid);} else {$mycourseid = $site->id;}$shortname = format_string($site->shortname, true, array('context' => context_course::instance(SITEID)));$PAGE->navbar->add($strblogentries, $blogurl);$blogurl->remove_params('userid');$PAGE->navbar->add($entry->subject, $blogurl);$blogentryby = get_string('blogentrybyuser', 'blog', fullname($user));$PAGE->set_title($entry->subject . moodle_page::TITLE_SEPARATOR . $blogentryby);$PAGE->set_heading("$shortname: " . fullname($user) . ": $entry->subject");$headers['heading'] = $blogentryby;// We ignore tag and search params.if (empty($action) || !$CFG->useblogassociations) {$headers['url'] = $blogurl;return $headers;}}if (!empty($userid) && empty($entryid) && ((empty($courseid) && empty($modid)) || !$CFG->useblogassociations)) {// Case 3: A user's blog entries.$shortname = format_string($site->shortname, true, array('context' => context_course::instance(SITEID)));$blogurl->param('userid', $userid);$PAGE->set_title(fullname($user) . ": " . get_string('blog', 'blog'));$PAGE->set_heading("$shortname: " . fullname($user) . ": " . get_string('blog', 'blog'));$headers['heading'] = get_string('userblog', 'blog', fullname($user));$headers['strview'] = get_string('viewuserentries', 'blog', fullname($user));} else if (!$CFG->useblogassociations && empty($userid) && !in_array($action, array('edit', 'add'))) {// Case 4: No blog associations, no userid.$strsiteblog = get_string('siteblogheading', 'blog');$PAGE->set_title($strsiteblog);$PAGE->set_heading($site->fullname);$headers['heading'] = $strsiteblog;} else if (!empty($userid) && !empty($modid) && empty($entryid)) {// Case 5: Blog entries associated with an activity by a specific user (courseid ignored).$shortname = format_string($site->shortname, true, array('context' => context_course::instance(SITEID)));$blogurl->param('userid', $userid);$blogurl->param('modid', $modid);// Course module navigation is handled by build_navigation as the second param.$headers['cm'] = $cm;$PAGE->navbar->add(fullname($user), "$CFG->wwwroot/user/view.php?id=$user->id");$PAGE->navbar->add($strblogentries, $blogurl);$PAGE->set_title(fullname($user) . ': ' . get_string('blogentries', 'blog') . moodle_page::TITLE_SEPARATOR . $cm->name);$PAGE->set_heading("$shortname: $cm->name: " . fullname($user) . ': ' . get_string('blogentries', 'blog'));$a = new stdClass();$a->user = fullname($user);$a->mod = $cm->name;$a->type = get_string('modulename', $cm->modname);$headers['heading'] = get_string('blogentriesbyuseraboutmodule', 'blog', $a);$headers['stradd'] = get_string('blogaboutthis', 'blog', $a);$headers['strview'] = get_string('viewallmodentries', 'blog', $a);} else if (!empty($userid) && !empty($courseid) && empty($modid) && empty($entryid)) {// Case 6: Blog entries associated with a course by a specific user.$blogurl->param('userid', $userid);$blogurl->param('courseid', $courseid);$PAGE->set_title($course->fullname);$PAGE->set_heading($course->fullname);$a = new stdClass();$a->user = fullname($user);$a->course = format_string($course->fullname, true, array('context' => context_course::instance($course->id)));$a->type = get_string('course');$headers['heading'] = get_string('blogentriesbyuseraboutcourse', 'blog', $a);$headers['stradd'] = get_string('blogaboutthis', 'blog', $a);$headers['strview'] = get_string('viewblogentries', 'blog', $a);// Remove the userid from the URL to inform the blog_menu block correctly.$blogurl->remove_params(array('userid'));} else if (!empty($groupid) && empty($modid) && empty($entryid)) {// Case 7: Blog entries by members of a group, associated with that group's course.$blogurl->param('courseid', $course->id);$PAGE->navbar->add($strblogentries, $blogurl);$blogurl->remove_params(array('courseid'));$blogurl->param('groupid', $groupid);$PAGE->navbar->add($group->name, $blogurl);$PAGE->set_title($course->fullname);$PAGE->set_heading($course->fullname);$a = new stdClass();$a->group = $group->name;$a->course = format_string($course->fullname, true, array('context' => context_course::instance($course->id)));$a->type = get_string('course');$headers['heading'] = get_string('blogentriesbygroupaboutcourse', 'blog', $a);$headers['stradd'] = get_string('blogaboutthis', 'blog', $a);$headers['strview'] = get_string('viewblogentries', 'blog', $a);} else if (!empty($groupid) && !empty($modid) && empty($entryid)) {// Case 8: Blog entries by members of a group, associated with an activity in that course.$headers['cm'] = $cm;$blogurl->param('modid', $modid);$PAGE->navbar->add($strblogentries, $blogurl);$blogurl->param('groupid', $groupid);$PAGE->navbar->add($group->name, $blogurl);$PAGE->set_title($course->fullname);$PAGE->set_heading($course->fullname);$a = new stdClass();$a->group = $group->name;$a->mod = $cm->name;$a->type = get_string('modulename', $cm->modname);$headers['heading'] = get_string('blogentriesbygroupaboutmodule', 'blog', $a);$headers['stradd'] = get_string('blogaboutthis', 'blog', $a);$headers['strview'] = get_string('viewallmodentries', 'blog', $a);} else if (!empty($modid) && empty($userid) && empty($groupid) && empty($entryid)) {// Case 9: All blog entries associated with an activity.$PAGE->set_cm($cm, $course);$blogurl->param('modid', $modid);$PAGE->navbar->add($strblogentries, $blogurl);$PAGE->set_title($course->fullname);$PAGE->set_heading($course->fullname);$headers['heading'] = get_string('blogentriesabout', 'blog', $cm->name);$a = new stdClass();$a->type = get_string('modulename', $cm->modname);$headers['stradd'] = get_string('blogaboutthis', 'blog', $a);$headers['strview'] = get_string('viewallmodentries', 'blog', $a);} else if (!empty($courseid) && empty($userid) && empty($groupid) && empty($modid) && empty($entryid)) {// Case 10: All blog entries associated with a course.$blogurl->param('courseid', $courseid);$PAGE->navbar->add($strblogentries, $blogurl);$PAGE->set_title($course->fullname);$PAGE->set_heading($course->fullname);$a = new stdClass();$a->type = get_string('course');$headers['heading'] = get_string('blogentriesabout','blog',format_string($course->fullname,true,array('context' => context_course::instance($course->id))));$headers['stradd'] = get_string('blogaboutthis', 'blog', $a);$headers['strview'] = get_string('viewblogentries', 'blog', $a);$blogurl->remove_params(array('userid'));}if (!in_array($action, array('edit', 'add'))) {// Append Tag info.if (!empty($tagid)) {$headers['filters']['tag'] = $tagid;$blogurl->param('tagid', $tagid);$tagrec = $DB->get_record('tag', array('id' => $tagid));$PAGE->navbar->add($tagrec->name, $blogurl);} else if (!empty($tag)) {if ($tagrec = $DB->get_record('tag', array('name' => $tag))) {$tagid = $tagrec->id;$headers['filters']['tag'] = $tagid;$blogurl->param('tag', $tag);$PAGE->navbar->add(get_string('tagparam', 'blog', $tag), $blogurl);}}// Append Search info.if (!empty($search) && has_capability('moodle/blog:search', $sitecontext)) {$headers['filters']['search'] = $search;$blogurl->param('search', $search);$PAGE->navbar->add(get_string('searchterm', 'blog', s($search)), $blogurl->out());}}// Append edit mode info.if (!empty($action) && $action == 'add') {} else if (!empty($action) && $action == 'edit') {$PAGE->navbar->add(get_string('editentry', 'blog'));}if (empty($headers['url'])) {$headers['url'] = $blogurl;}return $headers;}/*** Shortcut function for getting a count of blog entries associated with a course or a module* @param int $courseid The ID of the course* @param int $cmid The ID of the course_modules* @return string The number of associated entries*/function blog_get_associated_count($courseid, $cmid=null) {global $DB;$context = context_course::instance($courseid);if ($cmid) {$context = context_module::instance($cmid);}return $DB->count_records('blog_association', array('contextid' => $context->id));}/*** Running addtional permission check on plugin, for example, plugins* may have switch to turn on/off comments option, this callback will* affect UI display, not like pluginname_comment_validate only throw* exceptions.* blog_comment_validate will be called before viewing/adding/deleting* comment, so don't repeat checks.* Capability check has been done in comment->check_permissions(), we* don't need to do it again here.** @package core_blog* @category comment** @param stdClass $commentparam {* context => context the context object* courseid => int course id* cm => stdClass course module object* commentarea => string comment area* itemid => int itemid* }* @return array*/function blog_comment_permissions($commentparam) {global $DB;// If blog is public and current user is guest, then don't let him post comments.$blogentry = $DB->get_record('post', array('id' => $commentparam->itemid), 'publishstate', MUST_EXIST);if ($blogentry->publishstate != 'public') {if (!isloggedin() || isguestuser()) {return array('post' => false, 'view' => true);}}return array('post' => true, 'view' => true);}/*** Validate comment parameter before perform other comments actions** @package core_blog* @category comment** @param stdClass $comment {* context => context the context object* courseid => int course id* cm => stdClass course module object* commentarea => string comment area* itemid => int itemid* }* @return boolean*/function blog_comment_validate($commentparam) {global $CFG, $DB, $USER;// Check if blogs are enabled user can comment.if (empty($CFG->enableblogs) || empty($CFG->blogusecomments)) {throw new comment_exception('nopermissiontocomment');}// Validate comment area.if ($commentparam->commentarea != 'format_blog') {throw new comment_exception('invalidcommentarea');}$blogentry = $DB->get_record('post', array('id' => $commentparam->itemid), '*', MUST_EXIST);// Validation for comment deletion.if (!empty($commentparam->commentid)) {if ($record = $DB->get_record('comments', array('id' => $commentparam->commentid))) {if ($record->commentarea != 'format_blog') {throw new comment_exception('invalidcommentarea');}if ($record->contextid != $commentparam->context->id) {throw new comment_exception('invalidcontext');}if ($record->itemid != $commentparam->itemid) {throw new comment_exception('invalidcommentitemid');}} else {throw new comment_exception('invalidcommentid');}}// Validate if user has blog view permission.$sitecontext = context_system::instance();return has_capability('moodle/blog:view', $sitecontext) &&blog_user_can_view_user_entry($blogentry->userid, $blogentry);}/*** Return a list of page types* @param string $pagetype current page type* @param stdClass $parentcontext Block's parent context* @param stdClass $currentcontext Current context of block*/function blog_page_type_list($pagetype, $parentcontext, $currentcontext) {return array('*' => get_string('page-x', 'pagetype'),'blog-*' => get_string('page-blog-x', 'blog'),'blog-index' => get_string('page-blog-index', 'blog'),'blog-edit' => get_string('page-blog-edit', 'blog'));}/*** Add nodes to myprofile page.** @param \core_user\output\myprofile\tree $tree Tree object* @param stdClass $user user object* @param bool $iscurrentuser* @param stdClass $course Course object** @return bool*/function core_blog_myprofile_navigation(core_user\output\myprofile\tree $tree, $user, $iscurrentuser, $course) {global $CFG;if (!blog_is_enabled_for_user() || isguestuser($user)) {// The guest user cannot post, so it is not possible to view any posts.// Also blogs might be disabled.// May as well just bail aggressively here.return true;}if (!blog_user_can_view_user_entry($user->id)) {return true;}$url = new moodle_url("/blog/index.php", array('userid' => $user->id));if (!empty($course)) {$url->param('courseid', $course->id);}if ($iscurrentuser) {$title = get_string('blogentries', 'core_blog');} else {$title = get_string('myprofileuserblogs', 'core_blog');}$blognode = new core_user\output\myprofile\node('miscellaneous', 'blogs', $title, null, $url);$tree->add_node($blognode);return true;}/*** Returns posts tagged with a specified tag.** @param core_tag_tag $tag* @param bool $exclusivemode if set to true it means that no other entities tagged with this tag* are displayed on the page and the per-page limit may be bigger* @param int $fromctx context id where the link was displayed, may be used by callbacks* to display items in the same context first* @param int $ctx context id where to search for records* @param bool $rec search in subcontexts as well* @param int $page 0-based number of page being displayed* @return \core_tag\output\tagindex*/function blog_get_tagged_posts($tag, $exclusivemode = false, $fromctx = 0, $ctx = 0, $rec = true, $page = 0) {global $CFG, $OUTPUT;require_once($CFG->dirroot.'/user/lib.php');$systemcontext = context_system::instance();$perpage = $exclusivemode ? 20 : 5;$context = $ctx ? context::instance_by_id($ctx) : context_system::instance();$content = '';if (empty($CFG->enableblogs) || !has_capability('moodle/blog:view', $systemcontext)) {// Blogs are not enabled or are not visible to the current user.$totalpages = 0;} else if ($context->contextlevel != CONTEXT_SYSTEM && empty($CFG->useblogassociations)) {// No blog entries can be associated to the non-system context.$totalpages = 0;} else if (!$rec && $context->contextlevel != CONTEXT_COURSE && $context->contextlevel != CONTEXT_MODULE) {// No blog entries can be associated with category or block context.$totalpages = 0;} else {require_once($CFG->dirroot.'/blog/locallib.php');$filters = array('tag' => $tag->id);if ($rec) {if ($context->contextlevel != CONTEXT_SYSTEM) {$filters['context'] = $context->id;}} else if ($context->contextlevel == CONTEXT_COURSE) {$filters['course'] = $context->instanceid;} else if ($context->contextlevel == CONTEXT_MODULE) {$filters['module'] = $context->instanceid;}$bloglisting = new blog_listing($filters);$blogs = $bloglisting->get_entries($page * $perpage, $perpage);$totalcount = $bloglisting->count_entries();$totalpages = ceil($totalcount / $perpage);if (!empty($blogs)) {$tagfeed = new core_tag\output\tagfeed();foreach ($blogs as $blog) {$user = fullclone($blog);$user->id = $blog->userid;$user->deleted = 0;$img = $OUTPUT->user_picture($user, array('size' => 35));$subject = format_string($blog->subject);if ($blog->publishstate == 'draft') {$class = 'dimmed';} else {$class = '';}$url = new moodle_url('/blog/index.php', array('entryid' => $blog->id));$subject = html_writer::link($url, $subject, array('class' => $class));$fullname = fullname($user);if (user_can_view_profile($user)) {$profilelink = new moodle_url('/user/view.php', array('id' => $blog->userid));$fullname = html_writer::link($profilelink, $fullname);}$details = $fullname . ', ' . userdate($blog->created);$tagfeed->add($img, $subject, $details);}$items = $tagfeed->export_for_template($OUTPUT);$content = $OUTPUT->render_from_template('core_tag/tagfeed', $items);$urlparams = array('tagid' => $tag->id);if ($context->contextlevel == CONTEXT_COURSE) {$urlparams['courseid'] = $context->instanceid;} else if ($context->contextlevel == CONTEXT_MODULE) {$urlparams['modid'] = $context->instanceid;}$allblogsurl = new moodle_url('/blog/index.php', $urlparams);$rv = new core_tag\output\tagindex($tag, 'core', 'post',$content,$exclusivemode, $fromctx, $ctx, $rec, $page, $totalpages);$rv->exclusiveurl = $allblogsurl;return $rv;}}$rv = new core_tag\output\tagindex($tag, 'core', 'post',$content,$exclusivemode, $fromctx, $ctx, $rec, $page, $totalpages);$rv->exclusiveurl = null;return $rv;}/*** Validate the access to a blog.** @param int $courseid course id the the blog is associated to (can be null).* @param int $modid module id the blog is associated to (can be null).* @param int $groupid group id to filter blogs I can see (can be null)* @param int $entryid blog entry id (can be null)* @param int $userid blog author id (can be null)* @return array with the calculated course and id* @since Moodle 3.6*/function blog_validate_access($courseid, $modid, $groupid, $entryid, $userid) {global $CFG, $DB, $USER, $COURSE;$sitecontext = context_system::instance();// Add courseid if modid or groupid is specified: This is used for navigation and title.if (!empty($modid) && empty($courseid)) {$courseid = $DB->get_field('course_modules', 'course', array('id' => $modid));}if (!empty($groupid) && empty($courseid)) {$courseid = $DB->get_field('groups', 'courseid', array('id' => $groupid));}if (!$userid && has_capability('moodle/blog:view', $sitecontext) && $CFG->bloglevel > BLOG_USER_LEVEL) {if ($entryid) {if (!$entryobject = $DB->get_record('post', array('id' => $entryid))) {throw new \moodle_exception('nosuchentry', 'blog');}$userid = $entryobject->userid;}} else if (!$userid) {$userid = $USER->id;}if (!empty($modid)) {if ($CFG->bloglevel < BLOG_SITE_LEVEL) {throw new \moodle_exception('courseblogdisable', 'blog');}if (!$mod = $DB->get_record('course_modules', array('id' => $modid))) {throw new \moodle_exception('invalidmoduleid', 'error', '', $modid);}$courseid = $mod->course;}if ((empty($courseid) ? true : $courseid == SITEID) && empty($userid)) {if ($CFG->bloglevel < BLOG_SITE_LEVEL) {throw new \moodle_exception('siteblogdisable', 'blog');}if (!has_capability('moodle/blog:view', $sitecontext)) {throw new \moodle_exception('cannotviewsiteblog', 'blog');}$COURSE = $DB->get_record('course', array('format' => 'site'));$courseid = $COURSE->id;}if (!empty($courseid)) {if (!$course = $DB->get_record('course', array('id' => $courseid))) {throw new \moodle_exception('invalidcourseid');}$courseid = $course->id;if (!has_capability('moodle/blog:view', $sitecontext)) {throw new \moodle_exception('cannotviewcourseblog', 'blog');}} else {$coursecontext = context_course::instance(SITEID);}if (!empty($groupid)) {if ($CFG->bloglevel < BLOG_SITE_LEVEL) {throw new \moodle_exception('groupblogdisable', 'blog');}if (! $group = groups_get_group($groupid)) {throw new \moodle_exception('invalidgroupid', 'blog');}if (!$course = $DB->get_record('course', array('id' => $group->courseid))) {throw new \moodle_exception('invalidcourseid');}$coursecontext = context_course::instance($course->id);$courseid = $course->id;if (!has_capability('moodle/blog:view', $sitecontext)) {throw new \moodle_exception('cannotviewcourseorgroupblog', 'blog');}if (groups_get_course_groupmode($course) == SEPARATEGROUPS &&!has_capability('moodle/site:accessallgroups', $coursecontext)) {if (!groups_is_member($groupid)) {throw new \moodle_exception('notmemberofgroup');}}}if (!empty($userid)) {if ($CFG->bloglevel < BLOG_USER_LEVEL) {throw new \moodle_exception('blogdisable', 'blog');}if (!$user = $DB->get_record('user', array('id' => $userid))) {throw new \moodle_exception('invaliduserid');}if ($user->deleted) {throw new \moodle_exception('userdeleted');}if ($USER->id == $userid) {if (!has_capability('moodle/blog:create', $sitecontext)&& !has_capability('moodle/blog:view', $sitecontext)) {throw new \moodle_exception('donothaveblog', 'blog');}} else {if (!has_capability('moodle/blog:view', $sitecontext) || !blog_user_can_view_user_entry($userid)) {throw new \moodle_exception('cannotviewcourseblog', 'blog');}}}return array($courseid, $userid);}/*** Get blog editor and attachment options for when creating or updating an entry** @param mixed $entry The entry object (can be null)* @return array editor and attachment options*/function blog_get_editor_options(mixed $entry = null): array {global $CFG;if (is_null($entry)) {$entry = new stdClass();$entry->id = null;}$sitecontext = context_system::instance();$summaryoptions = ['maxfiles' => 99, 'maxbytes' => $CFG->maxbytes, 'trusttext' => true, 'context' => $sitecontext,'subdirs' => file_area_contains_subdirs($sitecontext, 'blog', 'post', $entry->id)];$attachmentoptions = ['subdirs' => false, 'maxfiles' => 99, 'maxbytes' => $CFG->maxbytes];return [$summaryoptions, $attachmentoptions];}