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