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
27defined('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 */
33class 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 $text;
55    }
56}
57
58
59function filter_emailprotect_alter_email($matches) {
60    return $matches[1].obfuscate_text($matches[2]).$matches[3];
61}
62
63function filter_emailprotect_alter_mailto($matches) {
64    return obfuscate_mailto($matches[2], $matches[4]);
65}
66
67
68