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1 <?php
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2
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3 /**
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4 +-----------------------------------------------------------------------+
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5 | This file is part of the Roundcube Webmail client |
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6 | Copyright (C) 2005-2012, The Roundcube Dev Team |
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7 | |
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8 | Licensed under the GNU General Public License version 3 or |
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9 | any later version with exceptions for skins & plugins. |
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10 | See the README file for a full license statement. |
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11 | |
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12 | PURPOSE: |
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13 | Provide basic functions for base URL replacement |
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14 +-----------------------------------------------------------------------+
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15 | Author: Thomas Bruederli <roundcube@gmail.com> |
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16 +-----------------------------------------------------------------------+
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17 */
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18
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19 /**
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20 * Helper class to turn relative urls into absolute ones
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21 * using a predefined base
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22 *
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23 * @package Framework
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24 * @subpackage Utils
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25 * @author Thomas Bruederli <roundcube@gmail.com>
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26 */
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27 class rcube_base_replacer
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28 {
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29 private $base_url;
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30
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31
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32 /**
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33 * Class constructor
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34 *
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35 * @param string $base Base URL
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36 */
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37 public function __construct($base)
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38 {
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39 $this->base_url = $base;
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40 }
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41
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42 /**
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43 * Replace callback
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44 *
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45 * @param array $matches Matching entries
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46 *
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47 * @return string Replaced text with absolute URL
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48 */
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49 public function callback($matches)
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50 {
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51 return $matches[1] . '="' . self::absolute_url($matches[3], $this->base_url) . '"';
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52 }
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53
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54 /**
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55 * Convert base URLs to absolute ones
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56 *
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57 * @param string $body Text body
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58 *
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59 * @return string Replaced text
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60 */
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61 public function replace($body)
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62 {
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63 $regexp = array(
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64 '/(src|background|href)=(["\']?)([^"\'\s>]+)(\2|\s|>)/i',
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65 '/(url\s*\()(["\']?)([^"\'\)\s]+)(\2)\)/i',
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66 );
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67
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68 return preg_replace_callback($regexp, array($this, 'callback'), $body);
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69 }
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70
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71 /**
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72 * Convert paths like ../xxx to an absolute path using a base url
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73 *
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74 * @param string $path Relative path
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75 * @param string $base_url Base URL
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76 *
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77 * @return string Absolute URL
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78 */
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79 public static function absolute_url($path, $base_url)
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80 {
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81 // check if path is an absolute URL
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82 if (preg_match('/^[fhtps]+:\/\//', $path)) {
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83 return $path;
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84 }
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85
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86 // check if path is a content-id scheme
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87 if (strpos($path, 'cid:') === 0) {
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88 return $path;
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89 }
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90
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91 $host_url = $base_url;
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92 $abs_path = $path;
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93
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94 // cut base_url to the last directory
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95 if (strrpos($base_url, '/') > 7) {
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96 $host_url = substr($base_url, 0, strpos($base_url, '/', 7));
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97 $base_url = substr($base_url, 0, strrpos($base_url, '/'));
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98 }
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99
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100 // $path is absolute
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101 if ($path[0] == '/') {
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102 $abs_path = $host_url.$path;
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103 }
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104 else {
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105 // strip './' because its the same as ''
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106 $path = preg_replace('/^\.\//', '', $path);
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107
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108 if (preg_match_all('/\.\.\//', $path, $matches, PREG_SET_ORDER)) {
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109 $cnt = count($matches);
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110 while ($cnt--) {
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111 if ($pos = strrpos($base_url, '/')) {
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112 $base_url = substr($base_url, 0, $pos);
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113 }
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114 $path = substr($path, 3);
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115 }
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116 }
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117
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118 $abs_path = $base_url.'/'.$path;
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119 }
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120
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121 return $abs_path;
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122 }
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123 }
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