comment/locallib.php

   1 <?php
   2
   3 // This file is part of Moodle - http://moodle.org/
   4 //
   5 // Moodle is free software: you can redistribute it and/or modify
   6 // it under the terms of the GNU General Public License as published by
   7 // the Free Software Foundation, either version 3 of the License, or
   8 // (at your option) any later version.
   9 //
  10 // Moodle is distributed in the hope that it will be useful,
  11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 // GNU General Public License for more details.
  14 //
  15 // You should have received a copy of the GNU General Public License
  16 // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  17
  18 /**
  19  * comment_manager is helper class to manage moodle comments in admin page (Reports->Comments)
  20  *
  21  * @package   core_comment
  22  * @copyright 2010 Dongsheng Cai {@link http://dongsheng.org}
  23  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  24  */
  25 class comment_manager {
  26
  27     /** @var int The number of comments to display per page */
  28     private $perpage;
  29
  30     /** @var stdClass Course data. */
  31     protected $course;
  32
  33     /** @var context|bool To store the context object or false if not found. */
  34     protected $context;
  35
  36     /** @var stdClass Course module. */
  37     protected $cm;
  38
  39     /** @var course_modinfo Module information for course, or null if resetting. */
  40     protected $modinfo;
  41
  42     /** @var string plugin type. */
  43     protected $plugintype;
  44
  45     /** @var string plugin name. */
  46     protected $pluginname;
  47
  48     /**
  49      * Constructs the comment_manage object
  50      */
  51     public function __construct() {
  52         global $CFG;
  53         $this->perpage = $CFG->commentsperpage;
  54     }
  55
  56     /**
  57      * Return comments by pages
  58      *
  59      * @global moodle_database $DB
  60      * @param int $page
  61      * @return array An array of comments
  62      */
  63     function get_comments($page) {
  64         global $DB;
  65
  66         if ($page == 0) {
  67             $start = 0;
  68         } else {
  69             $start = $page * $this->perpage;
  70         }
  71         $comments = array();
  72
  73         $userfieldsapi = \core_user\fields::for_name();
  74         $usernamefields = $userfieldsapi->get_sql('u', false, '', '', false)->selects;
  75         $sql = "SELECT c.id, c.contextid, c.itemid, c.component, c.commentarea, c.userid, c.content, $usernamefields, c.timecreated
  76                   FROM {comments} c
  77                   JOIN {user} u
  78                        ON u.id=c.userid
  79               ORDER BY c.timecreated ASC";
  80         $rs = $DB->get_recordset_sql($sql, null, $start, $this->perpage);
  81         $formatoptions = array('overflowdiv' => true, 'blanktarget' => true);
  82         foreach ($rs as $item) {
  83             // Set calculated fields
  84             $item->fullname = fullname($item);
  85             $item->time = userdate($item->timecreated);
  86             $item->content = format_text($item->content, FORMAT_MOODLE, $formatoptions);
  87             // Unset fields not related to the comment
  88             foreach (\core_user\fields::get_name_fields() as $namefield) {
  89                 unset($item->$namefield);
  90             }
  91             unset($item->timecreated);
  92             // Record the comment
  93             $comments[] = $item;
  94         }
  95         $rs->close();
  96
  97         return $comments;
  98     }
  99
 100     /**
 101      * Records the course object
 102      *
 103      * @global moodle_page $PAGE
 104      * @global moodle_database $DB
 105      * @param int $courseid
 106      */
 107     private function setup_course($courseid) {
 108         global $PAGE, $DB;
 109         if (!empty($this->course) && $this->course->id == $courseid) {
 110             // already set, stop
 111             return;
 112         }
 113         if ($courseid == $PAGE->course->id) {
 114             $this->course = $PAGE->course;
 115         } else if (!$this->course = $DB->get_record('course', array('id' => $courseid))) {
 116             $this->course = null;
 117         }
 118     }
 119
 120     /**
 121      * Sets up the module or block information for a comment
 122      *
 123      * @global moodle_database $DB
 124      * @param stdClass $comment
 125      * @return bool
 126      */
 127     private function setup_plugin($comment) {
 128         global $DB;
 129         $this->context = context::instance_by_id($comment->contextid, IGNORE_MISSING);
 130         if (!$this->context) {
 131             return false;
 132         }
 133         switch ($this->context->contextlevel) {
 134             case CONTEXT_BLOCK:
 135                 if ($block = $DB->get_record('block_instances', array('id' => $this->context->instanceid))) {
 136                     $this->plugintype = 'block';
 137                     $this->pluginname = $block->blockname;
 138                 } else {
 139                     return false;
 140                 }
 141                 break;
 142             case CONTEXT_MODULE:
 143                 $this->plugintype = 'mod';
 144                 $this->cm = get_coursemodule_from_id('', $this->context->instanceid);
 145                 $this->setup_course($this->cm->course);
 146                 $this->modinfo = get_fast_modinfo($this->course);
 147                 $this->pluginname = $this->modinfo->cms[$this->cm->id]->modname;
 148                 break;
 149         }
 150         return true;
 151     }
 152
 153     /**
 154      * Print comments
 155      * @param int $page
 156      * @return bool return false if no comments available
 157      *
 158      * @deprecated since Moodle 4.2 - please do not use this function any more
 159      */
 160     public function print_comments($page = 0) {
 161         global $OUTPUT, $CFG, $OUTPUT, $DB;
 162
 163         debugging('The function ' . __FUNCTION__ . '() is deprecated, please do not use it any more. ' .
 164             'See \'comments\' system report class for replacement', DEBUG_DEVELOPER);
 165
 166         $count = $DB->count_records('comments');
 167         $comments = $this->get_comments($page);
 168         if (count($comments) == 0) {
 169             echo $OUTPUT->notification(get_string('nocomments', 'moodle'));
 170             return false;
 171         }
 172
 173         $table = new html_table();
 174         $table->head = array (
 175             html_writer::checkbox('selectall', '', false, get_string('selectall'), array('id' => 'comment_select_all',
 176                 'class' => 'mr-1')),
 177             get_string('author', 'search'),
 178             get_string('content'),
 179             get_string('action')
 180         );
 181         $table->colclasses = array ('leftalign', 'leftalign', 'leftalign', 'leftalign');
 182         $table->attributes = array('class'=>'admintable generaltable');
 183         $table->id = 'commentstable';
 184         $table->data = array();
 185
 186         $link = new moodle_url('/comment/index.php', array('action' => 'delete', 'sesskey' => sesskey()));
 187         foreach ($comments as $c) {
 188             $userdata = html_writer::link(new moodle_url('/user/profile.php', ['id' => $c->userid]), $c->fullname);
 189             $this->setup_plugin($c);
 190             if (!empty($this->plugintype)) {
 191                 $context_url = plugin_callback($this->plugintype, $this->pluginname, 'comment', 'url', array($c));
 192             }
 193             $checkbox = html_writer::checkbox('comments', $c->id, false);
 194             $action = html_writer::link(new moodle_url($link, array('commentid' => $c->id)), get_string('delete'));
 195             if (!empty($context_url)) {
 196                 $action .= html_writer::empty_tag('br');
 197                 $action .= html_writer::link($context_url, get_string('commentincontext'), array('target'=>'_blank'));
 198             }
 199             $table->data[] = array($checkbox, $userdata, $c->content, $action);
 200         }
 201         echo html_writer::table($table);
 202         echo $OUTPUT->paging_bar($count, $page, $this->perpage, $CFG->wwwroot.'/comment/index.php');
 203         return true;
 204     }
 205
 206     /**
 207      * Delete a comment
 208      *
 209      * @param int $commentid
 210      * @return bool
 211      */
 212     public function delete_comment($commentid) {
 213         global $DB;
 214         if ($DB->record_exists('comments', array('id' => $commentid))) {
 215             $DB->delete_records('comments', array('id' => $commentid));
 216             return true;
 217         }
 218         return false;
 219     }
 220     /**
 221      * Delete comments
 222      *
 223      * @param string $list A list of comment ids separated by hyphens
 224      * @return bool
 225      */
 226     public function delete_comments($list) {
 227         global $DB;
 228         $ids = explode('-', $list);
 229         foreach ($ids as $id) {
 230             $id = (int)$id;
 231             if ($DB->record_exists('comments', array('id' => $id))) {
 232                 $DB->delete_records('comments', array('id' => $id));
 233             }
 234         }
 235         return true;
 236     }
 237
 238     /**
 239      * Get comments created since a given time.
 240      *
 241      * @param  stdClass $course    course object
 242      * @param  stdClass $context   context object
 243      * @param  string $component   component name
 244      * @param  int $since          the time to check
 245      * @param  stdClass|\cm_info|null $cm course module object
 246      * @return array list of comments db records since the given timelimit
 247      * @since Moodle 3.2
 248      */
 249     public function get_component_comments_since($course, $context, $component, $since, $cm = null) {
 250         global $DB;
 251
 252         $commentssince = array();
 253         $where = 'contextid = ? AND component = ? AND timecreated > ?';
 254         $comments = $DB->get_records_select('comments', $where, array($context->id, $component, $since));
 255         // Check item by item if we have permissions.
 256         $managersviewstatus = array();
 257         foreach ($comments as $comment) {
 258             // Check if the manager for the item is cached.
 259             if (!isset($managersviewstatus[$comment->commentarea]) or
 260                     !isset($managersviewstatus[$comment->commentarea][$comment->itemid])) {
 261
 262                 $args = new stdClass;
 263                 $args->area      = $comment->commentarea;
 264                 $args->itemid    = $comment->itemid;
 265                 $args->context   = $context;
 266                 $args->course    = $course;
 267                 $args->client_id = 0;
 268                 $args->component = $component;
 269                 if (!empty($cm)) {
 270                     $args->cm = $cm;
 271                 }
 272
 273                 $manager = new comment($args);
 274                 $managersviewstatus[$comment->commentarea][$comment->itemid] = $manager->can_view();
 275             }
 276
 277             if ($managersviewstatus[$comment->commentarea][$comment->itemid]) {
 278                 $commentssince[$comment->id] = $comment;
 279             }
 280         }
 281         return $commentssince;
 282     }
 283 }