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<?php // This file is part of Moodle - http://moodle.org/ // // Moodle is free software: you can redistribute it and/or modify // it under the terms of the GNU General Public License as published by // the Free Software Foundation, either version 3 of the License, or // (at your option) any later version. // // Moodle is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // // You should have received a copy of the GNU General Public License // along with Moodle. If not, see <http://www.gnu.org/licenses/>. /** * Basic email protection filter. * * @package filter * @subpackage emailprotect * @copyright 2004 Mike Churchward * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later */ defined('MOODLE_INTERNAL') || die(); /** * This class looks for email addresses in Moodle text and * hides them using the Moodle obfuscate_text function. */ class filter_emailprotect extends moodle_text_filter { function filter($text, array $options = array()) { /// Do a quick check using stripos to avoid unnecessary work if (strpos($text, '@') === false) { return $text; } /// There might be an email in here somewhere so continue ... $matches = array(); /// regular expression to define a standard email string. $emailregex = '((?:[\w\.\-])+\@(?:(?:[a-zA-Z\d\-])+\.)+(?:[a-zA-Z\d]{2,4}))'; /// pattern to find a mailto link with the linked text. $pattern = '|(<a\s+href\s*=\s*[\'"]?mailto:)'.$emailregex.'([\'"]?\s*>)'.'(.*)'.'(</a>)|iU'; $text = preg_replace_callback($pattern, 'filter_emailprotect_alter_mailto', $text); /// pattern to find any other email address in the text. $pattern = '/(^|\s+|>)'.$emailregex.'($|\s+|\.\s+|\.$|<)/i'; $text = preg_replace_callback($pattern, 'filter_emailprotect_alter_email', $text); return $text; } } function filter_emailprotect_alter_email($matches) { return $matches[1].obfuscate_text($matches[2]).$matches[3]; } function filter_emailprotect_alter_mailto($matches) { return obfuscate_mailto($matches[2], $matches[4]); }