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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/>.
/**
* Functions and classes for comments management
*
* @package core
* @copyright 2010 Dongsheng Cai {@link http://dongsheng.org}
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die();
/**
* comment_manager is helper class to manage moodle comments in admin page (Reports->Comments)
*
* @package core
* @copyright 2010 Dongsheng Cai {@link http://dongsheng.org}
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class comment_manager {
/** @var int The number of comments to display per page */
private $perpage;
/**
* Constructs the comment_manage object
*/
public function __construct() {
global $CFG;
$this->perpage = $CFG->commentsperpage;
}
/**
* Return comments by pages
*
* @global moodle_database $DB
* @param int $page
* @return array An array of comments
*/
function get_comments($page) {
global $DB;
if ($page == 0) {
$start = 0;
} else {
$start = $page * $this->perpage;
}
$comments = array();
$usernamefields = get_all_user_name_fields(true, 'u');
$sql = "SELECT c.id, c.contextid, c.itemid, c.component, c.commentarea, c.userid, c.content, $usernamefields, c.timecreated
FROM {comments} c
JOIN {user} u
ON u.id=c.userid
ORDER BY c.timecreated ASC";
$rs = $DB->get_recordset_sql($sql, null, $start, $this->perpage);
$formatoptions = array('overflowdiv' => true, 'blanktarget' => true);
foreach ($rs as $item) {
// Set calculated fields
$item->fullname = fullname($item);
$item->time = userdate($item->timecreated);
$item->content = format_text($item->content, FORMAT_MOODLE, $formatoptions);
// Unset fields not related to the comment
foreach (get_all_user_name_fields() as $namefield) {
unset($item->$namefield);
}
unset($item->timecreated);
// Record the comment
$comments[] = $item;
}
$rs->close();
return $comments;
}
/**
* Records the course object
*
* @global moodle_page $PAGE
* @global moodle_database $DB
* @param int $courseid
*/
private function setup_course($courseid) {
global $PAGE, $DB;
if (!empty($this->course) && $this->course->id == $courseid) {
// already set, stop
return;
}
if ($courseid == $PAGE->course->id) {
$this->course = $PAGE->course;
} else if (!$this->course = $DB->get_record('course', array('id' => $courseid))) {
$this->course = null;
}
}
/**
* Sets up the module or block information for a comment
*
* @global moodle_database $DB
* @param stdClass $comment
* @return bool
*/
private function setup_plugin($comment) {
global $DB;
$this->context = context::instance_by_id($comment->contextid, IGNORE_MISSING);
if (!$this->context) {
return false;
}
switch ($this->context->contextlevel) {
case CONTEXT_BLOCK:
if ($block = $DB->get_record('block_instances', array('id' => $this->context->instanceid))) {
$this->plugintype = 'block';
$this->pluginname = $block->blockname;
} else {
return false;
}
break;
case CONTEXT_MODULE:
$this->plugintype = 'mod';
$this->cm = get_coursemodule_from_id('', $this->context->instanceid);
$this->setup_course($this->cm->course);
$this->modinfo = get_fast_modinfo($this->course);
$this->pluginname = $this->modinfo->cms[$this->cm->id]->modname;
break;
}
return true;
}
/**
* Print comments
* @param int $page
* @return bool return false if no comments available
*/
public function print_comments($page = 0) {
global $OUTPUT, $CFG, $OUTPUT, $DB;
$count = $DB->count_records('comments');
$comments = $this->get_comments($page);
if (count($comments) == 0) {
echo $OUTPUT->notification(get_string('nocomments', 'moodle'));
return false;
}
$table = new html_table();
$table->head = array (
html_writer::checkbox('selectall', '', false, get_string('selectall'), array('id' => 'comment_select_all',
'class' => 'mr-1')),
get_string('author', 'search'),
get_string('content'),
get_string('action')
);
$table->colclasses = array ('leftalign', 'leftalign', 'leftalign', 'leftalign');
$table->attributes = array('class'=>'admintable generaltable');
$table->id = 'commentstable';
$table->data = array();
$link = new moodle_url('/comment/index.php', array('action' => 'delete', 'sesskey' => sesskey()));
foreach ($comments as $c) {
$userdata = html_writer::link(new moodle_url('/user/profile.php', ['id' => $c->userid]), $c->fullname);
$this->setup_plugin($c);
if (!empty($this->plugintype)) {
$context_url = plugin_callback($this->plugintype, $this->pluginname, 'comment', 'url', array($c));
}
$checkbox = html_writer::checkbox('comments', $c->id, false);
$action = html_writer::link(new moodle_url($link, array('commentid' => $c->id)), get_string('delete'));
if (!empty($context_url)) {
$action .= html_writer::empty_tag('br');
$action .= html_writer::link($context_url, get_string('commentincontext'), array('target'=>'_blank'));
}
$table->data[] = array($checkbox, $userdata, $c->content, $action);
}
echo html_writer::table($table);
echo $OUTPUT->paging_bar($count, $page, $this->perpage, $CFG->wwwroot.'/comment/index.php');
return true;
}
/**
* Delete a comment
*
* @param int $commentid
* @return bool
*/
public function delete_comment($commentid) {
global $DB;
if ($DB->record_exists('comments', array('id' => $commentid))) {
$DB->delete_records('comments', array('id' => $commentid));
return true;
}
return false;
}
/**
* Delete comments
*
* @param string $list A list of comment ids separated by hyphens
* @return bool
*/
public function delete_comments($list) {
global $DB;
$ids = explode('-', $list);
foreach ($ids as $id) {
$id = (int)$id;
if ($DB->record_exists('comments', array('id' => $id))) {
$DB->delete_records('comments', array('id' => $id));
}
}
return true;
}
/**
* Get comments created since a given time.
*
* @param stdClass $course course object
* @param stdClass $context context object
* @param string $component component name
* @param int $since the time to check
* @param stdClass $cm course module object
* @return array list of comments db records since the given timelimit
* @since Moodle 3.2
*/
public function get_component_comments_since($course, $context, $component, $since, $cm = null) {
global $DB;
$commentssince = array();
$where = 'contextid = ? AND component = ? AND timecreated > ?';
$comments = $DB->get_records_select('comments', $where, array($context->id, $component, $since));
// Check item by item if we have permissions.
$managersviewstatus = array();
foreach ($comments as $comment) {
// Check if the manager for the item is cached.
if (!isset($managersviewstatus[$comment->commentarea]) or
!isset($managersviewstatus[$comment->commentarea][$comment->itemid])) {
$args = new stdClass;
$args->area = $comment->commentarea;
$args->itemid = $comment->itemid;
$args->context = $context;
$args->course = $course;
$args->client_id = 0;
$args->component = $component;
if (!empty($cm)) {
$args->cm = $cm;
}
$manager = new comment($args);
$managersviewstatus[$comment->commentarea][$comment->itemid] = $manager->can_view();
}
if ($managersviewstatus[$comment->commentarea][$comment->itemid]) {
$commentssince[$comment->id] = $comment;
}
}
return $commentssince;
}
}