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   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   *  Censorship filtering
  20   *
  21   *  This very simple example of a Text Filter will parse
  22   *  printed text, blacking out words perceived to be bad
  23   *
  24   * @package    filter
  25   * @subpackage censor
  26   * @copyright  2004 onwards Martin Dougiamas  {@link http://moodle.com}
  27   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  28   */
  29  
  30  defined('MOODLE_INTERNAL') || die();
  31  
  32  //////////////////////////////////////////////////////////////
  33  //  Censorship filtering
  34  //
  35  //  This very simple example of a Text Filter will parse
  36  //  printed text, blacking out words perceived to be bad
  37  //
  38  //  The list of words is in the lang/xx/moodle.php
  39  //
  40  //////////////////////////////////////////////////////////////
  41  
  42  class filter_censor extends moodle_text_filter {
  43      private function _canseecensor() {
  44          return is_siteadmin(); //TODO: add proper access control
  45      }
  46  
  47      function hash(){
  48          $cap = "mod/filter:censor";
  49          if (is_siteadmin()) {  //TODO: add proper access control
  50              $cap = "mod/filter:seecensor";
  51          }
  52          return $cap;
  53      }
  54  
  55      function filter($text, array $options = array()){
  56          static $words;
  57          global $CFG;
  58  
  59          if (!isset($CFG->filter_censor_badwords)) {
  60              set_config( 'filter_censor_badwords','' );
  61          }
  62  
  63          if (empty($words)) {
  64              $words = array();
  65              if (empty($CFG->filter_censor_badwords)) {
  66                  $badwords = explode(',',get_string('badwords', 'filter_censor'));
  67              }
  68              else {
  69                  $badwords = explode(',', $CFG->filter_censor_badwords);
  70              }
  71              foreach ($badwords as $badword) {
  72                  $badword = trim($badword);
  73                  if($this->_canseecensor()){
  74                      $words[] = new filterobject($badword, '<span class="censoredtexthighlight" title="'.$badword.'">', '</span>',
  75                          false, false, $badword);
  76                  } else {
  77                      $words[] = new filterobject($badword, '<span class="censoredtext" title="'.$badword.'">',
  78                          '</span>', false, false, str_pad('',strlen($badword),'*'));
  79                  }
  80              }
  81          }
  82          return filter_phrases($text, $words);
  83      }
  84  }
  85  
  86