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         $sql = "SELECT c.id, c.contextid, c.itemid, c.commentarea, c.userid, c.content, u.firstname, u.lastname, c.timecreated
  65                   FROM {comments} c
  66                   JOIN {user} u
  67                        ON u.id=c.userid
  68               ORDER BY c.timecreated ASC";
  69         $rs = $DB->get_recordset_sql($sql, null, $start, $this->perpage);
  70         $formatoptions = array('overflowdiv' => true);
  71         foreach ($rs as $item) {
  72             // Set calculated fields
  73             $item->fullname = fullname($item);
  74             $item->time = userdate($item->timecreated);
  75             $item->content = format_text($item->content, FORMAT_MOODLE, $formatoptions);
  76             // Unset fields not related to the comment
  77             unset($item->firstname);
  78             unset($item->lastname);
  79             unset($item->timecreated);
  80             // Record the comment
  81             $comments[] = $item;
  82         }
  83         $rs->close();
  84
  85         return $comments;
  86     }
  87
  88     /**
  89      * Records the course object
  90      *
  91      * @global moodle_page $PAGE
  92      * @global moodle_database $DB
  93      * @param int $courseid
  94      */
  95     private function setup_course($courseid) {
  96         global $PAGE, $DB;
  97         if (!empty($this->course) && $this->course->id == $courseid) {
  98             // already set, stop
  99             return;
 100         }
 101         if ($courseid == $PAGE->course->id) {
 102             $this->course = $PAGE->course;
 103         } else if (!$this->course = $DB->get_record('course', array('id' => $courseid))) {
 104             $this->course = null;
 105         }
 106     }
 107
 108     /**
 109      * Sets up the module or block information for a comment
 110      *
 111      * @global moodle_database $DB
 112      * @param stdClass $comment
 113      * @return bool
 114      */
 115     private function setup_plugin($comment) {
 116         global $DB;
 117         $this->context = context::instance_by_id($comment->contextid, IGNORE_MISSING);
 118         if (!$this->context) {
 119             return false;
 120         }
 121         switch ($this->context->contextlevel) {
 122             case CONTEXT_BLOCK:
 123                 if ($block = $DB->get_record('block_instances', array('id' => $this->context->instanceid))) {
 124                     $this->plugintype = 'block';
 125                     $this->pluginname = $block->blockname;
 126                 } else {
 127                     return false;
 128                 }
 129                 break;
 130             case CONTEXT_MODULE:
 131                 $this->plugintype = 'mod';
 132                 $this->cm = get_coursemodule_from_id('', $this->context->instanceid);
 133                 $this->setup_course($this->cm->course);
 134                 $this->modinfo = get_fast_modinfo($this->course);
 135                 $this->pluginname = $this->modinfo->cms[$this->cm->id]->modname;
 136                 break;
 137         }
 138         return true;
 139     }
 140
 141     /**
 142      * Print comments
 143      * @param int $page
 144      * @return bool return false if no comments available
 145      */
 146     public function print_comments($page = 0) {
 147         global $OUTPUT, $CFG, $OUTPUT, $DB;
 148
 149         $count = $DB->count_records('comments');
 150         $comments = $this->get_comments($page);
 151         if (count($comments) == 0) {
 152             echo $OUTPUT->notification(get_string('nocomments', 'moodle'));
 153             return false;
 154         }
 155
 156         $table = new html_table();
 157         $table->head = array (
 158             html_writer::checkbox('selectall', '', false, get_string('selectall'), array('id'=>'comment_select_all', 'class'=>'comment-report-selectall')),
 159             get_string('author', 'search'),
 160             get_string('content'),
 161             get_string('action')
 162         );
 163         $table->colclasses = array ('leftalign', 'leftalign', 'leftalign', 'leftalign');
 164         $table->attributes = array('class'=>'admintable generaltable');
 165         $table->id = 'commentstable';
 166         $table->data = array();
 167
 168         $link = new moodle_url('/comment/index.php', array('action' => 'delete', 'sesskey' => sesskey()));
 169         foreach ($comments as $c) {
 170             $this->setup_plugin($c);
 171             if (!empty($this->plugintype)) {
 172                 $context_url = plugin_callback($this->plugintype, $this->pluginname, 'comment', 'url', array($c));
 173             }
 174             $checkbox = html_writer::checkbox('comments', $c->id, false);
 175             $action = html_writer::link(new moodle_url($link, array('commentid' => $c->id)), get_string('delete'));
 176             if (!empty($context_url)) {
 177                 $action .= html_writer::empty_tag('br');
 178                 $action .= html_writer::link($context_url, get_string('commentincontext'), array('target'=>'_blank'));
 179             }
 180             $table->data[] = array($checkbox, $c->fullname, $c->content, $action);
 181         }
 182         echo html_writer::table($table);
 183         echo $OUTPUT->paging_bar($count, $page, $this->perpage, $CFG->wwwroot.'/comment/index.php');
 184         return true;
 185     }
 186
 187     /**
 188      * Delete a comment
 189      *
 190      * @param int $commentid
 191      * @return bool
 192      */
 193     public function delete_comment($commentid) {
 194         global $DB;
 195         if ($DB->record_exists('comments', array('id' => $commentid))) {
 196             $DB->delete_records('comments', array('id' => $commentid));
 197             return true;
 198         }
 199         return false;
 200     }
 201     /**
 202      * Delete comments
 203      *
 204      * @param string $list A list of comment ids separated by hyphens
 205      * @return bool
 206      */
 207     public function delete_comments($list) {
 208         global $DB;
 209         $ids = explode('-', $list);
 210         foreach ($ids as $id) {
 211             $id = (int)$id;
 212             if ($DB->record_exists('comments', array('id' => $id))) {
 213                 $DB->delete_records('comments', array('id' => $id));
 214             }
 215         }
 216         return true;
 217     }
 218 }