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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   * Basic email protection filter.
  20   *
  21   * @package    filter
  22   * @subpackage emailprotect
  23   * @copyright  2004 Mike Churchward
  24   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  25   */
  26  
  27  defined('MOODLE_INTERNAL') || die();
  28  
  29  /**
  30   * This class looks for email addresses in Moodle text and
  31   * hides them using the Moodle obfuscate_text function.
  32   */
  33  class filter_emailprotect extends moodle_text_filter {
  34      function filter($text, array $options = array()) {
  35      /// Do a quick check using stripos to avoid unnecessary work
  36          if (strpos($text, '@') === false) {
  37              return $text;
  38          }
  39  
  40      /// There might be an email in here somewhere so continue ...
  41          $matches = array();
  42  
  43      /// regular expression to define a standard email string.
  44          $emailregex = '((?:[\w\.\-])+\@(?:(?:[a-zA-Z\d\-])+\.)+(?:[a-zA-Z\d]{2,4}))';
  45  
  46      /// pattern to find a mailto link with the linked text.
  47          $pattern = '|(<a\s+href\s*=\s*[\'"]?mailto:)'.$emailregex.'([\'"]?\s*>)'.'(.*)'.'(</a>)|iU';
  48          $text = preg_replace_callback($pattern, 'filter_emailprotect_alter_mailto', $text);
  49  
  50      /// pattern to find any other email address in the text.
  51          $pattern = '/(^|\s+|>)'.$emailregex.'($|\s+|\.\s+|\.$|<)/i';
  52          $text = preg_replace_callback($pattern, 'filter_emailprotect_alter_email', $text);
  53  
  54          return $text;
  55      }
  56  }
  57  
  58  
  59  function filter_emailprotect_alter_email($matches) {
  60      return $matches[1].obfuscate_text($matches[2]).$matches[3];
  61  }
  62  
  63  function filter_emailprotect_alter_mailto($matches) {
  64      return obfuscate_mailto($matches[2], $matches[4]);
  65  }
  66  
  67