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1 <?php |
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2 /** |
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3 * kses 0.2.2 - HTML/XHTML filter that only allows some elements and attributes |
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4 * Copyright (C) 2002, 2003, 2005 Ulf Harnhammar |
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5 * |
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6 * This program is free software and open source software; you can redistribute |
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7 * it and/or modify it under the terms of the GNU General Public License as |
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8 * published by the Free Software Foundation; either version 2 of the License, |
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9 * or (at your option) any later version. |
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10 * |
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11 * This program is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
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14 * more details. |
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15 * |
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16 * You should have received a copy of the GNU General Public License along |
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17 * with this program; if not, write to the Free Software Foundation, Inc., |
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18 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA |
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19 * http://www.gnu.org/licenses/gpl.html |
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20 * |
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21 * [kses strips evil scripts!] |
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22 * |
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23 * Added wp_ prefix to avoid conflicts with existing kses users |
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24 * |
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25 * @version 0.2.2 |
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26 * @copyright (C) 2002, 2003, 2005 |
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27 * @author Ulf Harnhammar <http://advogato.org/person/metaur/> |
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28 * |
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29 * @package External |
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30 * @subpackage KSES |
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31 * |
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32 */ |
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33 |
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34 /** |
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35 * You can override this in a plugin. |
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36 * |
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37 * The wp_kses_allowed_html filter is more powerful and supplies context. |
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38 * CUSTOM_TAGS is not recommended and should be considered deprecated. |
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39 * |
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40 * @see wp_kses_allowed_html() |
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41 * |
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42 * @since 1.2.0 |
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43 */ |
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44 if ( ! defined( 'CUSTOM_TAGS' ) ) |
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45 define( 'CUSTOM_TAGS', false ); |
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46 |
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47 if ( ! CUSTOM_TAGS ) { |
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48 /** |
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49 * Kses global for default allowable HTML tags. |
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50 * |
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51 * Can be override by using CUSTOM_TAGS constant. |
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52 * |
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53 * @global array $allowedposttags |
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54 * @since 2.0.0 |
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55 */ |
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56 $allowedposttags = array( |
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57 'address' => array(), |
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58 'a' => array( |
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59 'href' => true, |
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60 'rel' => true, |
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61 'rev' => true, |
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62 'name' => true, |
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63 'target' => true, |
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64 ), |
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65 'abbr' => array(), |
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66 'acronym' => array(), |
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67 'area' => array( |
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68 'alt' => true, |
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69 'coords' => true, |
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70 'href' => true, |
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71 'nohref' => true, |
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72 'shape' => true, |
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73 'target' => true, |
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74 ), |
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75 'article' => array( |
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76 'align' => true, |
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77 'dir' => true, |
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78 'lang' => true, |
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79 'xml:lang' => true, |
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80 ), |
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81 'aside' => array( |
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82 'align' => true, |
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83 'dir' => true, |
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84 'lang' => true, |
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85 'xml:lang' => true, |
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86 ), |
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87 'b' => array(), |
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88 'big' => array(), |
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89 'blockquote' => array( |
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90 'cite' => true, |
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91 'lang' => true, |
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92 'xml:lang' => true, |
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93 ), |
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94 'br' => array(), |
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95 'button' => array( |
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96 'disabled' => true, |
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97 'name' => true, |
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98 'type' => true, |
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99 'value' => true, |
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100 ), |
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101 'caption' => array( |
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102 'align' => true, |
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103 ), |
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104 'cite' => array( |
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105 'dir' => true, |
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106 'lang' => true, |
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107 ), |
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108 'code' => array(), |
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109 'col' => array( |
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110 'align' => true, |
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111 'char' => true, |
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112 'charoff' => true, |
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113 'span' => true, |
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114 'dir' => true, |
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115 'valign' => true, |
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116 'width' => true, |
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117 ), |
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118 'del' => array( |
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119 'datetime' => true, |
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120 ), |
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121 'dd' => array(), |
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122 'details' => array( |
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123 'align' => true, |
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124 'dir' => true, |
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125 'lang' => true, |
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126 'open' => true, |
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127 'xml:lang' => true, |
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128 ), |
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129 'div' => array( |
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130 'align' => true, |
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131 'dir' => true, |
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132 'lang' => true, |
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133 'xml:lang' => true, |
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134 ), |
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135 'dl' => array(), |
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136 'dt' => array(), |
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137 'em' => array(), |
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138 'fieldset' => array(), |
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139 'figure' => array( |
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140 'align' => true, |
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141 'dir' => true, |
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142 'lang' => true, |
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143 'xml:lang' => true, |
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144 ), |
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145 'figcaption' => array( |
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146 'align' => true, |
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147 'dir' => true, |
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148 'lang' => true, |
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149 'xml:lang' => true, |
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150 ), |
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151 'font' => array( |
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152 'color' => true, |
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153 'face' => true, |
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154 'size' => true, |
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155 ), |
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156 'footer' => array( |
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157 'align' => true, |
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158 'dir' => true, |
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159 'lang' => true, |
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160 'xml:lang' => true, |
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161 ), |
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162 'form' => array( |
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163 'action' => true, |
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164 'accept' => true, |
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165 'accept-charset' => true, |
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166 'enctype' => true, |
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167 'method' => true, |
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168 'name' => true, |
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169 'target' => true, |
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170 ), |
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171 'h1' => array( |
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172 'align' => true, |
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173 ), |
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174 'h2' => array( |
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175 'align' => true, |
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176 ), |
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177 'h3' => array( |
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178 'align' => true, |
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179 ), |
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180 'h4' => array( |
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181 'align' => true, |
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182 ), |
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183 'h5' => array( |
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184 'align' => true, |
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185 ), |
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186 'h6' => array( |
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187 'align' => true, |
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188 ), |
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189 'header' => array( |
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190 'align' => true, |
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191 'dir' => true, |
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192 'lang' => true, |
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193 'xml:lang' => true, |
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194 ), |
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195 'hgroup' => array( |
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196 'align' => true, |
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197 'dir' => true, |
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198 'lang' => true, |
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199 'xml:lang' => true, |
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200 ), |
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201 'hr' => array( |
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202 'align' => true, |
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203 'noshade' => true, |
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204 'size' => true, |
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205 'width' => true, |
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206 ), |
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207 'i' => array(), |
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208 'img' => array( |
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209 'alt' => true, |
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210 'align' => true, |
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211 'border' => true, |
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212 'height' => true, |
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213 'hspace' => true, |
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214 'longdesc' => true, |
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215 'vspace' => true, |
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216 'src' => true, |
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217 'usemap' => true, |
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218 'width' => true, |
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219 ), |
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220 'ins' => array( |
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221 'datetime' => true, |
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222 'cite' => true, |
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223 ), |
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224 'kbd' => array(), |
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225 'label' => array( |
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226 'for' => true, |
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227 ), |
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228 'legend' => array( |
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229 'align' => true, |
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230 ), |
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231 'li' => array( |
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232 'align' => true, |
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233 'value' => true, |
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234 ), |
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235 'map' => array( |
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236 'name' => true, |
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237 ), |
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238 'menu' => array( |
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239 'type' => true, |
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240 ), |
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241 'nav' => array( |
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242 'align' => true, |
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243 'dir' => true, |
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244 'lang' => true, |
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245 'xml:lang' => true, |
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246 ), |
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247 'p' => array( |
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248 'align' => true, |
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249 'dir' => true, |
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250 'lang' => true, |
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251 'xml:lang' => true, |
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252 ), |
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253 'pre' => array( |
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254 'width' => true, |
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255 ), |
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256 'q' => array( |
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257 'cite' => true, |
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258 ), |
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259 's' => array(), |
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260 'span' => array( |
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261 'dir' => true, |
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262 'align' => true, |
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263 'lang' => true, |
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264 'xml:lang' => true, |
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265 ), |
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266 'section' => array( |
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267 'align' => true, |
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268 'dir' => true, |
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269 'lang' => true, |
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270 'xml:lang' => true, |
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271 ), |
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272 'small' => array(), |
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273 'strike' => array(), |
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274 'strong' => array(), |
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275 'sub' => array(), |
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276 'summary' => array( |
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277 'align' => true, |
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278 'dir' => true, |
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279 'lang' => true, |
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280 'xml:lang' => true, |
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281 ), |
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282 'sup' => array(), |
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283 'table' => array( |
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284 'align' => true, |
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285 'bgcolor' => true, |
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286 'border' => true, |
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287 'cellpadding' => true, |
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288 'cellspacing' => true, |
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289 'dir' => true, |
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290 'rules' => true, |
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291 'summary' => true, |
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292 'width' => true, |
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293 ), |
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294 'tbody' => array( |
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295 'align' => true, |
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296 'char' => true, |
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297 'charoff' => true, |
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298 'valign' => true, |
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299 ), |
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300 'td' => array( |
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301 'abbr' => true, |
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302 'align' => true, |
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303 'axis' => true, |
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304 'bgcolor' => true, |
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305 'char' => true, |
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306 'charoff' => true, |
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307 'colspan' => true, |
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308 'dir' => true, |
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309 'headers' => true, |
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310 'height' => true, |
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311 'nowrap' => true, |
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312 'rowspan' => true, |
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313 'scope' => true, |
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314 'valign' => true, |
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315 'width' => true, |
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316 ), |
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317 'textarea' => array( |
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318 'cols' => true, |
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319 'rows' => true, |
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320 'disabled' => true, |
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321 'name' => true, |
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322 'readonly' => true, |
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323 ), |
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324 'tfoot' => array( |
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325 'align' => true, |
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326 'char' => true, |
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327 'charoff' => true, |
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328 'valign' => true, |
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329 ), |
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330 'th' => array( |
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331 'abbr' => true, |
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332 'align' => true, |
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333 'axis' => true, |
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334 'bgcolor' => true, |
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335 'char' => true, |
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336 'charoff' => true, |
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337 'colspan' => true, |
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338 'headers' => true, |
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339 'height' => true, |
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340 'nowrap' => true, |
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341 'rowspan' => true, |
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342 'scope' => true, |
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343 'valign' => true, |
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344 'width' => true, |
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345 ), |
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346 'thead' => array( |
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347 'align' => true, |
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348 'char' => true, |
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349 'charoff' => true, |
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350 'valign' => true, |
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351 ), |
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352 'title' => array(), |
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353 'tr' => array( |
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354 'align' => true, |
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355 'bgcolor' => true, |
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356 'char' => true, |
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357 'charoff' => true, |
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358 'valign' => true, |
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359 ), |
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360 'tt' => array(), |
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361 'u' => array(), |
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362 'ul' => array( |
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363 'type' => true, |
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364 ), |
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365 'ol' => array( |
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366 'start' => true, |
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367 'type' => true, |
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368 ), |
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369 'var' => array(), |
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370 ); |
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371 |
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372 /** |
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373 * Kses allowed HTML elements. |
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374 * |
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375 * @global array $allowedtags |
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376 * @since 1.0.0 |
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377 */ |
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378 $allowedtags = array( |
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379 'a' => array( |
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380 'href' => true, |
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381 'title' => true, |
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382 ), |
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383 'abbr' => array( |
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384 'title' => true, |
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385 ), |
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386 'acronym' => array( |
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387 'title' => true, |
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388 ), |
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389 'b' => array(), |
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390 'blockquote' => array( |
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391 'cite' => true, |
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392 ), |
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393 'cite' => array(), |
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394 'code' => array(), |
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395 'del' => array( |
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396 'datetime' => true, |
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397 ), |
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398 'em' => array(), |
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399 'i' => array(), |
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400 'q' => array( |
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401 'cite' => true, |
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402 ), |
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403 'strike' => array(), |
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404 'strong' => array(), |
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405 ); |
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406 |
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407 $allowedentitynames = array( |
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408 'nbsp', 'iexcl', 'cent', 'pound', 'curren', 'yen', |
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409 'brvbar', 'sect', 'uml', 'copy', 'ordf', 'laquo', |
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410 'not', 'shy', 'reg', 'macr', 'deg', 'plusmn', |
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411 'acute', 'micro', 'para', 'middot', 'cedil', 'ordm', |
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412 'raquo', 'iquest', 'Agrave', 'Aacute', 'Acirc', 'Atilde', |
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413 'Auml', 'Aring', 'AElig', 'Ccedil', 'Egrave', 'Eacute', |
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414 'Ecirc', 'Euml', 'Igrave', 'Iacute', 'Icirc', 'Iuml', |
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415 'ETH', 'Ntilde', 'Ograve', 'Oacute', 'Ocirc', 'Otilde', |
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416 'Ouml', 'times', 'Oslash', 'Ugrave', 'Uacute', 'Ucirc', |
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417 'Uuml', 'Yacute', 'THORN', 'szlig', 'agrave', 'aacute', |
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418 'acirc', 'atilde', 'auml', 'aring', 'aelig', 'ccedil', |
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419 'egrave', 'eacute', 'ecirc', 'euml', 'igrave', 'iacute', |
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420 'icirc', 'iuml', 'eth', 'ntilde', 'ograve', 'oacute', |
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421 'ocirc', 'otilde', 'ouml', 'divide', 'oslash', 'ugrave', |
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422 'uacute', 'ucirc', 'uuml', 'yacute', 'thorn', 'yuml', |
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423 'quot', 'amp', 'lt', 'gt', 'apos', 'OElig', |
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424 'oelig', 'Scaron', 'scaron', 'Yuml', 'circ', 'tilde', |
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425 'ensp', 'emsp', 'thinsp', 'zwnj', 'zwj', 'lrm', |
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426 'rlm', 'ndash', 'mdash', 'lsquo', 'rsquo', 'sbquo', |
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427 'ldquo', 'rdquo', 'bdquo', 'dagger', 'Dagger', 'permil', |
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428 'lsaquo', 'rsaquo', 'euro', 'fnof', 'Alpha', 'Beta', |
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429 'Gamma', 'Delta', 'Epsilon', 'Zeta', 'Eta', 'Theta', |
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430 'Iota', 'Kappa', 'Lambda', 'Mu', 'Nu', 'Xi', |
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431 'Omicron', 'Pi', 'Rho', 'Sigma', 'Tau', 'Upsilon', |
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432 'Phi', 'Chi', 'Psi', 'Omega', 'alpha', 'beta', |
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433 'gamma', 'delta', 'epsilon', 'zeta', 'eta', 'theta', |
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434 'iota', 'kappa', 'lambda', 'mu', 'nu', 'xi', |
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435 'omicron', 'pi', 'rho', 'sigmaf', 'sigma', 'tau', |
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436 'upsilon', 'phi', 'chi', 'psi', 'omega', 'thetasym', |
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437 'upsih', 'piv', 'bull', 'hellip', 'prime', 'Prime', |
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438 'oline', 'frasl', 'weierp', 'image', 'real', 'trade', |
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439 'alefsym', 'larr', 'uarr', 'rarr', 'darr', 'harr', |
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440 'crarr', 'lArr', 'uArr', 'rArr', 'dArr', 'hArr', |
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441 'forall', 'part', 'exist', 'empty', 'nabla', 'isin', |
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442 'notin', 'ni', 'prod', 'sum', 'minus', 'lowast', |
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443 'radic', 'prop', 'infin', 'ang', 'and', 'or', |
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444 'cap', 'cup', 'int', 'sim', 'cong', 'asymp', |
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445 'ne', 'equiv', 'le', 'ge', 'sub', 'sup', |
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446 'nsub', 'sube', 'supe', 'oplus', 'otimes', 'perp', |
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447 'sdot', 'lceil', 'rceil', 'lfloor', 'rfloor', 'lang', |
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448 'rang', 'loz', 'spades', 'clubs', 'hearts', 'diams', |
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449 ); |
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450 |
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451 $allowedposttags = array_map( '_wp_add_global_attributes', $allowedposttags ); |
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452 } else { |
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453 $allowedtags = wp_kses_array_lc( $allowedtags ); |
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454 $allowedposttags = wp_kses_array_lc( $allowedposttags ); |
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455 } |
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456 |
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457 /** |
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458 * Filters content and keeps only allowable HTML elements. |
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459 * |
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460 * This function makes sure that only the allowed HTML element names, attribute |
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461 * names and attribute values plus only sane HTML entities will occur in |
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462 * $string. You have to remove any slashes from PHP's magic quotes before you |
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463 * call this function. |
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464 * |
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465 * The default allowed protocols are 'http', 'https', 'ftp', 'mailto', 'news', |
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466 * 'irc', 'gopher', 'nntp', 'feed', 'telnet, 'mms', 'rtsp' and 'svn'. This |
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467 * covers all common link protocols, except for 'javascript' which should not |
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468 * be allowed for untrusted users. |
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469 * |
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470 * @since 1.0.0 |
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471 * |
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472 * @param string $string Content to filter through kses |
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473 * @param array $allowed_html List of allowed HTML elements |
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474 * @param array $allowed_protocols Optional. Allowed protocol in links. |
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475 * @return string Filtered content with only allowed HTML elements |
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476 */ |
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477 function wp_kses( $string, $allowed_html, $allowed_protocols = array() ) { |
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478 if ( empty( $allowed_protocols ) ) |
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479 $allowed_protocols = wp_allowed_protocols(); |
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480 $string = wp_kses_no_null($string); |
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481 $string = wp_kses_js_entities($string); |
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482 $string = wp_kses_normalize_entities($string); |
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483 $string = wp_kses_hook($string, $allowed_html, $allowed_protocols); // WP changed the order of these funcs and added args to wp_kses_hook |
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484 return wp_kses_split($string, $allowed_html, $allowed_protocols); |
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485 } |
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486 |
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487 /** |
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488 * Return a list of allowed tags and attributes for a given context. |
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489 * |
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490 * @since 3.5.0 |
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491 * |
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492 * @param string $context The context for which to retrieve tags. Allowed values are |
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493 * post | strip | data | entities or the name of a field filter such as pre_user_description. |
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494 * @return array List of allowed tags and their allowed attributes. |
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495 */ |
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496 function wp_kses_allowed_html( $context = '' ) { |
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497 global $allowedposttags, $allowedtags, $allowedentitynames; |
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498 |
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499 if ( is_array( $context ) ) |
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500 return apply_filters( 'wp_kses_allowed_html', $context, 'explicit' ); |
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501 |
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502 switch ( $context ) { |
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503 case 'post': |
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504 return apply_filters( 'wp_kses_allowed_html', $allowedposttags, $context ); |
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505 break; |
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506 case 'user_description': |
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507 case 'pre_user_description': |
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508 $tags = $allowedtags; |
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509 $tags['a']['rel'] = true; |
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510 return apply_filters( 'wp_kses_allowed_html', $tags, $context ); |
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511 break; |
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512 case 'strip': |
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513 return apply_filters( 'wp_kses_allowed_html', array(), $context ); |
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514 break; |
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515 case 'entities': |
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516 return apply_filters( 'wp_kses_allowed_html', $allowedentitynames, $context); |
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517 break; |
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518 case 'data': |
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519 default: |
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520 return apply_filters( 'wp_kses_allowed_html', $allowedtags, $context ); |
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521 } |
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522 } |
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523 |
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524 /** |
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525 * You add any kses hooks here. |
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526 * |
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527 * There is currently only one kses WordPress hook and it is called here. All |
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528 * parameters are passed to the hooks and expected to receive a string. |
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529 * |
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530 * @since 1.0.0 |
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531 * |
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532 * @param string $string Content to filter through kses |
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533 * @param array $allowed_html List of allowed HTML elements |
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534 * @param array $allowed_protocols Allowed protocol in links |
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535 * @return string Filtered content through 'pre_kses' hook |
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536 */ |
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537 function wp_kses_hook( $string, $allowed_html, $allowed_protocols ) { |
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538 $string = apply_filters('pre_kses', $string, $allowed_html, $allowed_protocols); |
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539 return $string; |
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540 } |
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541 |
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542 /** |
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543 * This function returns kses' version number. |
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544 * |
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545 * @since 1.0.0 |
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546 * |
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547 * @return string KSES Version Number |
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548 */ |
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549 function wp_kses_version() { |
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550 return '0.2.2'; |
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551 } |
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552 |
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553 /** |
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554 * Searches for HTML tags, no matter how malformed. |
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555 * |
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556 * It also matches stray ">" characters. |
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557 * |
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558 * @since 1.0.0 |
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559 * |
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560 * @param string $string Content to filter |
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561 * @param array $allowed_html Allowed HTML elements |
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562 * @param array $allowed_protocols Allowed protocols to keep |
|
563 * @return string Content with fixed HTML tags |
|
564 */ |
|
565 function wp_kses_split( $string, $allowed_html, $allowed_protocols ) { |
|
566 global $pass_allowed_html, $pass_allowed_protocols; |
|
567 $pass_allowed_html = $allowed_html; |
|
568 $pass_allowed_protocols = $allowed_protocols; |
|
569 return preg_replace_callback( '%(<!--.*?(-->|$))|(<[^>]*(>|$)|>)%', '_wp_kses_split_callback', $string ); |
|
570 } |
|
571 |
|
572 /** |
|
573 * Callback for wp_kses_split. |
|
574 * |
|
575 * @since 3.1.0 |
|
576 * @access private |
|
577 */ |
|
578 function _wp_kses_split_callback( $match ) { |
|
579 global $pass_allowed_html, $pass_allowed_protocols; |
|
580 return wp_kses_split2( $match[0], $pass_allowed_html, $pass_allowed_protocols ); |
|
581 } |
|
582 |
|
583 /** |
|
584 * Callback for wp_kses_split for fixing malformed HTML tags. |
|
585 * |
|
586 * This function does a lot of work. It rejects some very malformed things like |
|
587 * <:::>. It returns an empty string, if the element isn't allowed (look ma, no |
|
588 * strip_tags()!). Otherwise it splits the tag into an element and an attribute |
|
589 * list. |
|
590 * |
|
591 * After the tag is split into an element and an attribute list, it is run |
|
592 * through another filter which will remove illegal attributes and once that is |
|
593 * completed, will be returned. |
|
594 * |
|
595 * @access private |
|
596 * @since 1.0.0 |
|
597 * @uses wp_kses_attr() |
|
598 * |
|
599 * @param string $string Content to filter |
|
600 * @param array $allowed_html Allowed HTML elements |
|
601 * @param array $allowed_protocols Allowed protocols to keep |
|
602 * @return string Fixed HTML element |
|
603 */ |
|
604 function wp_kses_split2($string, $allowed_html, $allowed_protocols) { |
|
605 $string = wp_kses_stripslashes($string); |
|
606 |
|
607 if (substr($string, 0, 1) != '<') |
|
608 return '>'; |
|
609 # It matched a ">" character |
|
610 |
|
611 if ( '<!--' == substr( $string, 0, 4 ) ) { |
|
612 $string = str_replace( array('<!--', '-->'), '', $string ); |
|
613 while ( $string != ($newstring = wp_kses($string, $allowed_html, $allowed_protocols)) ) |
|
614 $string = $newstring; |
|
615 if ( $string == '' ) |
|
616 return ''; |
|
617 // prevent multiple dashes in comments |
|
618 $string = preg_replace('/--+/', '-', $string); |
|
619 // prevent three dashes closing a comment |
|
620 $string = preg_replace('/-$/', '', $string); |
|
621 return "<!--{$string}-->"; |
|
622 } |
|
623 # Allow HTML comments |
|
624 |
|
625 if (!preg_match('%^<\s*(/\s*)?([a-zA-Z0-9]+)([^>]*)>?$%', $string, $matches)) |
|
626 return ''; |
|
627 # It's seriously malformed |
|
628 |
|
629 $slash = trim($matches[1]); |
|
630 $elem = $matches[2]; |
|
631 $attrlist = $matches[3]; |
|
632 |
|
633 if ( ! is_array( $allowed_html ) ) |
|
634 $allowed_html = wp_kses_allowed_html( $allowed_html ); |
|
635 |
|
636 if ( ! isset($allowed_html[strtolower($elem)]) ) |
|
637 return ''; |
|
638 # They are using a not allowed HTML element |
|
639 |
|
640 if ($slash != '') |
|
641 return "</$elem>"; |
|
642 # No attributes are allowed for closing elements |
|
643 |
|
644 return wp_kses_attr( $elem, $attrlist, $allowed_html, $allowed_protocols ); |
|
645 } |
|
646 |
|
647 /** |
|
648 * Removes all attributes, if none are allowed for this element. |
|
649 * |
|
650 * If some are allowed it calls wp_kses_hair() to split them further, and then |
|
651 * it builds up new HTML code from the data that kses_hair() returns. It also |
|
652 * removes "<" and ">" characters, if there are any left. One more thing it does |
|
653 * is to check if the tag has a closing XHTML slash, and if it does, it puts one |
|
654 * in the returned code as well. |
|
655 * |
|
656 * @since 1.0.0 |
|
657 * |
|
658 * @param string $element HTML element/tag |
|
659 * @param string $attr HTML attributes from HTML element to closing HTML element tag |
|
660 * @param array $allowed_html Allowed HTML elements |
|
661 * @param array $allowed_protocols Allowed protocols to keep |
|
662 * @return string Sanitized HTML element |
|
663 */ |
|
664 function wp_kses_attr($element, $attr, $allowed_html, $allowed_protocols) { |
|
665 # Is there a closing XHTML slash at the end of the attributes? |
|
666 |
|
667 if ( ! is_array( $allowed_html ) ) |
|
668 $allowed_html = wp_kses_allowed_html( $allowed_html ); |
|
669 |
|
670 $xhtml_slash = ''; |
|
671 if (preg_match('%\s*/\s*$%', $attr)) |
|
672 $xhtml_slash = ' /'; |
|
673 |
|
674 # Are any attributes allowed at all for this element? |
|
675 if ( ! isset($allowed_html[strtolower($element)]) || count($allowed_html[strtolower($element)]) == 0 ) |
|
676 return "<$element$xhtml_slash>"; |
|
677 |
|
678 # Split it |
|
679 $attrarr = wp_kses_hair($attr, $allowed_protocols); |
|
680 |
|
681 # Go through $attrarr, and save the allowed attributes for this element |
|
682 # in $attr2 |
|
683 $attr2 = ''; |
|
684 |
|
685 $allowed_attr = $allowed_html[strtolower($element)]; |
|
686 foreach ($attrarr as $arreach) { |
|
687 if ( ! isset( $allowed_attr[strtolower($arreach['name'])] ) ) |
|
688 continue; # the attribute is not allowed |
|
689 |
|
690 $current = $allowed_attr[strtolower($arreach['name'])]; |
|
691 if ( $current == '' ) |
|
692 continue; # the attribute is not allowed |
|
693 |
|
694 if ( strtolower( $arreach['name'] ) == 'style' ) { |
|
695 $orig_value = $arreach['value']; |
|
696 $value = safecss_filter_attr( $orig_value ); |
|
697 |
|
698 if ( empty( $value ) ) |
|
699 continue; |
|
700 |
|
701 $arreach['value'] = $value; |
|
702 $arreach['whole'] = str_replace( $orig_value, $value, $arreach['whole'] ); |
|
703 } |
|
704 |
|
705 if ( ! is_array($current) ) { |
|
706 $attr2 .= ' '.$arreach['whole']; |
|
707 # there are no checks |
|
708 |
|
709 } else { |
|
710 # there are some checks |
|
711 $ok = true; |
|
712 foreach ($current as $currkey => $currval) { |
|
713 if ( ! wp_kses_check_attr_val($arreach['value'], $arreach['vless'], $currkey, $currval) ) { |
|
714 $ok = false; |
|
715 break; |
|
716 } |
|
717 } |
|
718 |
|
719 if ( $ok ) |
|
720 $attr2 .= ' '.$arreach['whole']; # it passed them |
|
721 } # if !is_array($current) |
|
722 } # foreach |
|
723 |
|
724 # Remove any "<" or ">" characters |
|
725 $attr2 = preg_replace('/[<>]/', '', $attr2); |
|
726 |
|
727 return "<$element$attr2$xhtml_slash>"; |
|
728 } |
|
729 |
|
730 /** |
|
731 * Builds an attribute list from string containing attributes. |
|
732 * |
|
733 * This function does a lot of work. It parses an attribute list into an array |
|
734 * with attribute data, and tries to do the right thing even if it gets weird |
|
735 * input. It will add quotes around attribute values that don't have any quotes |
|
736 * or apostrophes around them, to make it easier to produce HTML code that will |
|
737 * conform to W3C's HTML specification. It will also remove bad URL protocols |
|
738 * from attribute values. It also reduces duplicate attributes by using the |
|
739 * attribute defined first (foo='bar' foo='baz' will result in foo='bar'). |
|
740 * |
|
741 * @since 1.0.0 |
|
742 * |
|
743 * @param string $attr Attribute list from HTML element to closing HTML element tag |
|
744 * @param array $allowed_protocols Allowed protocols to keep |
|
745 * @return array List of attributes after parsing |
|
746 */ |
|
747 function wp_kses_hair($attr, $allowed_protocols) { |
|
748 $attrarr = array(); |
|
749 $mode = 0; |
|
750 $attrname = ''; |
|
751 $uris = array('xmlns', 'profile', 'href', 'src', 'cite', 'classid', 'codebase', 'data', 'usemap', 'longdesc', 'action'); |
|
752 |
|
753 # Loop through the whole attribute list |
|
754 |
|
755 while (strlen($attr) != 0) { |
|
756 $working = 0; # Was the last operation successful? |
|
757 |
|
758 switch ($mode) { |
|
759 case 0 : # attribute name, href for instance |
|
760 |
|
761 if (preg_match('/^([-a-zA-Z]+)/', $attr, $match)) { |
|
762 $attrname = $match[1]; |
|
763 $working = $mode = 1; |
|
764 $attr = preg_replace('/^[-a-zA-Z]+/', '', $attr); |
|
765 } |
|
766 |
|
767 break; |
|
768 |
|
769 case 1 : # equals sign or valueless ("selected") |
|
770 |
|
771 if (preg_match('/^\s*=\s*/', $attr)) # equals sign |
|
772 { |
|
773 $working = 1; |
|
774 $mode = 2; |
|
775 $attr = preg_replace('/^\s*=\s*/', '', $attr); |
|
776 break; |
|
777 } |
|
778 |
|
779 if (preg_match('/^\s+/', $attr)) # valueless |
|
780 { |
|
781 $working = 1; |
|
782 $mode = 0; |
|
783 if(false === array_key_exists($attrname, $attrarr)) { |
|
784 $attrarr[$attrname] = array ('name' => $attrname, 'value' => '', 'whole' => $attrname, 'vless' => 'y'); |
|
785 } |
|
786 $attr = preg_replace('/^\s+/', '', $attr); |
|
787 } |
|
788 |
|
789 break; |
|
790 |
|
791 case 2 : # attribute value, a URL after href= for instance |
|
792 |
|
793 if (preg_match('%^"([^"]*)"(\s+|/?$)%', $attr, $match)) |
|
794 # "value" |
|
795 { |
|
796 $thisval = $match[1]; |
|
797 if ( in_array(strtolower($attrname), $uris) ) |
|
798 $thisval = wp_kses_bad_protocol($thisval, $allowed_protocols); |
|
799 |
|
800 if(false === array_key_exists($attrname, $attrarr)) { |
|
801 $attrarr[$attrname] = array ('name' => $attrname, 'value' => $thisval, 'whole' => "$attrname=\"$thisval\"", 'vless' => 'n'); |
|
802 } |
|
803 $working = 1; |
|
804 $mode = 0; |
|
805 $attr = preg_replace('/^"[^"]*"(\s+|$)/', '', $attr); |
|
806 break; |
|
807 } |
|
808 |
|
809 if (preg_match("%^'([^']*)'(\s+|/?$)%", $attr, $match)) |
|
810 # 'value' |
|
811 { |
|
812 $thisval = $match[1]; |
|
813 if ( in_array(strtolower($attrname), $uris) ) |
|
814 $thisval = wp_kses_bad_protocol($thisval, $allowed_protocols); |
|
815 |
|
816 if(false === array_key_exists($attrname, $attrarr)) { |
|
817 $attrarr[$attrname] = array ('name' => $attrname, 'value' => $thisval, 'whole' => "$attrname='$thisval'", 'vless' => 'n'); |
|
818 } |
|
819 $working = 1; |
|
820 $mode = 0; |
|
821 $attr = preg_replace("/^'[^']*'(\s+|$)/", '', $attr); |
|
822 break; |
|
823 } |
|
824 |
|
825 if (preg_match("%^([^\s\"']+)(\s+|/?$)%", $attr, $match)) |
|
826 # value |
|
827 { |
|
828 $thisval = $match[1]; |
|
829 if ( in_array(strtolower($attrname), $uris) ) |
|
830 $thisval = wp_kses_bad_protocol($thisval, $allowed_protocols); |
|
831 |
|
832 if(false === array_key_exists($attrname, $attrarr)) { |
|
833 $attrarr[$attrname] = array ('name' => $attrname, 'value' => $thisval, 'whole' => "$attrname=\"$thisval\"", 'vless' => 'n'); |
|
834 } |
|
835 # We add quotes to conform to W3C's HTML spec. |
|
836 $working = 1; |
|
837 $mode = 0; |
|
838 $attr = preg_replace("%^[^\s\"']+(\s+|$)%", '', $attr); |
|
839 } |
|
840 |
|
841 break; |
|
842 } # switch |
|
843 |
|
844 if ($working == 0) # not well formed, remove and try again |
|
845 { |
|
846 $attr = wp_kses_html_error($attr); |
|
847 $mode = 0; |
|
848 } |
|
849 } # while |
|
850 |
|
851 if ($mode == 1 && false === array_key_exists($attrname, $attrarr)) |
|
852 # special case, for when the attribute list ends with a valueless |
|
853 # attribute like "selected" |
|
854 $attrarr[$attrname] = array ('name' => $attrname, 'value' => '', 'whole' => $attrname, 'vless' => 'y'); |
|
855 |
|
856 return $attrarr; |
|
857 } |
|
858 |
|
859 /** |
|
860 * Performs different checks for attribute values. |
|
861 * |
|
862 * The currently implemented checks are "maxlen", "minlen", "maxval", "minval" |
|
863 * and "valueless". |
|
864 * |
|
865 * @since 1.0.0 |
|
866 * |
|
867 * @param string $value Attribute value |
|
868 * @param string $vless Whether the value is valueless. Use 'y' or 'n' |
|
869 * @param string $checkname What $checkvalue is checking for. |
|
870 * @param mixed $checkvalue What constraint the value should pass |
|
871 * @return bool Whether check passes |
|
872 */ |
|
873 function wp_kses_check_attr_val($value, $vless, $checkname, $checkvalue) { |
|
874 $ok = true; |
|
875 |
|
876 switch (strtolower($checkname)) { |
|
877 case 'maxlen' : |
|
878 # The maxlen check makes sure that the attribute value has a length not |
|
879 # greater than the given value. This can be used to avoid Buffer Overflows |
|
880 # in WWW clients and various Internet servers. |
|
881 |
|
882 if (strlen($value) > $checkvalue) |
|
883 $ok = false; |
|
884 break; |
|
885 |
|
886 case 'minlen' : |
|
887 # The minlen check makes sure that the attribute value has a length not |
|
888 # smaller than the given value. |
|
889 |
|
890 if (strlen($value) < $checkvalue) |
|
891 $ok = false; |
|
892 break; |
|
893 |
|
894 case 'maxval' : |
|
895 # The maxval check does two things: it checks that the attribute value is |
|
896 # an integer from 0 and up, without an excessive amount of zeroes or |
|
897 # whitespace (to avoid Buffer Overflows). It also checks that the attribute |
|
898 # value is not greater than the given value. |
|
899 # This check can be used to avoid Denial of Service attacks. |
|
900 |
|
901 if (!preg_match('/^\s{0,6}[0-9]{1,6}\s{0,6}$/', $value)) |
|
902 $ok = false; |
|
903 if ($value > $checkvalue) |
|
904 $ok = false; |
|
905 break; |
|
906 |
|
907 case 'minval' : |
|
908 # The minval check makes sure that the attribute value is a positive integer, |
|
909 # and that it is not smaller than the given value. |
|
910 |
|
911 if (!preg_match('/^\s{0,6}[0-9]{1,6}\s{0,6}$/', $value)) |
|
912 $ok = false; |
|
913 if ($value < $checkvalue) |
|
914 $ok = false; |
|
915 break; |
|
916 |
|
917 case 'valueless' : |
|
918 # The valueless check makes sure if the attribute has a value |
|
919 # (like <a href="blah">) or not (<option selected>). If the given value |
|
920 # is a "y" or a "Y", the attribute must not have a value. |
|
921 # If the given value is an "n" or an "N", the attribute must have one. |
|
922 |
|
923 if (strtolower($checkvalue) != $vless) |
|
924 $ok = false; |
|
925 break; |
|
926 } # switch |
|
927 |
|
928 return $ok; |
|
929 } |
|
930 |
|
931 /** |
|
932 * Sanitize string from bad protocols. |
|
933 * |
|
934 * This function removes all non-allowed protocols from the beginning of |
|
935 * $string. It ignores whitespace and the case of the letters, and it does |
|
936 * understand HTML entities. It does its work in a while loop, so it won't be |
|
937 * fooled by a string like "javascript:javascript:alert(57)". |
|
938 * |
|
939 * @since 1.0.0 |
|
940 * |
|
941 * @param string $string Content to filter bad protocols from |
|
942 * @param array $allowed_protocols Allowed protocols to keep |
|
943 * @return string Filtered content |
|
944 */ |
|
945 function wp_kses_bad_protocol($string, $allowed_protocols) { |
|
946 $string = wp_kses_no_null($string); |
|
947 $iterations = 0; |
|
948 |
|
949 do { |
|
950 $original_string = $string; |
|
951 $string = wp_kses_bad_protocol_once($string, $allowed_protocols); |
|
952 } while ( $original_string != $string && ++$iterations < 6 ); |
|
953 |
|
954 if ( $original_string != $string ) |
|
955 return ''; |
|
956 |
|
957 return $string; |
|
958 } |
|
959 |
|
960 /** |
|
961 * Removes any null characters in $string. |
|
962 * |
|
963 * @since 1.0.0 |
|
964 * |
|
965 * @param string $string |
|
966 * @return string |
|
967 */ |
|
968 function wp_kses_no_null($string) { |
|
969 $string = preg_replace('/\0+/', '', $string); |
|
970 $string = preg_replace('/(\\\\0)+/', '', $string); |
|
971 |
|
972 return $string; |
|
973 } |
|
974 |
|
975 /** |
|
976 * Strips slashes from in front of quotes. |
|
977 * |
|
978 * This function changes the character sequence \" to just ". It leaves all |
|
979 * other slashes alone. It's really weird, but the quoting from |
|
980 * preg_replace(//e) seems to require this. |
|
981 * |
|
982 * @since 1.0.0 |
|
983 * |
|
984 * @param string $string String to strip slashes |
|
985 * @return string Fixed string with quoted slashes |
|
986 */ |
|
987 function wp_kses_stripslashes($string) { |
|
988 return preg_replace('%\\\\"%', '"', $string); |
|
989 } |
|
990 |
|
991 /** |
|
992 * Goes through an array and changes the keys to all lower case. |
|
993 * |
|
994 * @since 1.0.0 |
|
995 * |
|
996 * @param array $inarray Unfiltered array |
|
997 * @return array Fixed array with all lowercase keys |
|
998 */ |
|
999 function wp_kses_array_lc($inarray) { |
|
1000 $outarray = array (); |
|
1001 |
|
1002 foreach ( (array) $inarray as $inkey => $inval) { |
|
1003 $outkey = strtolower($inkey); |
|
1004 $outarray[$outkey] = array (); |
|
1005 |
|
1006 foreach ( (array) $inval as $inkey2 => $inval2) { |
|
1007 $outkey2 = strtolower($inkey2); |
|
1008 $outarray[$outkey][$outkey2] = $inval2; |
|
1009 } # foreach $inval |
|
1010 } # foreach $inarray |
|
1011 |
|
1012 return $outarray; |
|
1013 } |
|
1014 |
|
1015 /** |
|
1016 * Removes the HTML JavaScript entities found in early versions of Netscape 4. |
|
1017 * |
|
1018 * @since 1.0.0 |
|
1019 * |
|
1020 * @param string $string |
|
1021 * @return string |
|
1022 */ |
|
1023 function wp_kses_js_entities($string) { |
|
1024 return preg_replace('%&\s*\{[^}]*(\}\s*;?|$)%', '', $string); |
|
1025 } |
|
1026 |
|
1027 /** |
|
1028 * Handles parsing errors in wp_kses_hair(). |
|
1029 * |
|
1030 * The general plan is to remove everything to and including some whitespace, |
|
1031 * but it deals with quotes and apostrophes as well. |
|
1032 * |
|
1033 * @since 1.0.0 |
|
1034 * |
|
1035 * @param string $string |
|
1036 * @return string |
|
1037 */ |
|
1038 function wp_kses_html_error($string) { |
|
1039 return preg_replace('/^("[^"]*("|$)|\'[^\']*(\'|$)|\S)*\s*/', '', $string); |
|
1040 } |
|
1041 |
|
1042 /** |
|
1043 * Sanitizes content from bad protocols and other characters. |
|
1044 * |
|
1045 * This function searches for URL protocols at the beginning of $string, while |
|
1046 * handling whitespace and HTML entities. |
|
1047 * |
|
1048 * @since 1.0.0 |
|
1049 * |
|
1050 * @param string $string Content to check for bad protocols |
|
1051 * @param string $allowed_protocols Allowed protocols |
|
1052 * @return string Sanitized content |
|
1053 */ |
|
1054 function wp_kses_bad_protocol_once($string, $allowed_protocols, $count = 1 ) { |
|
1055 $string2 = preg_split( '/:|�*58;|�*3a;/i', $string, 2 ); |
|
1056 if ( isset($string2[1]) && ! preg_match('%/\?%', $string2[0]) ) { |
|
1057 $string = trim( $string2[1] ); |
|
1058 $protocol = wp_kses_bad_protocol_once2( $string2[0], $allowed_protocols ); |
|
1059 if ( 'feed:' == $protocol ) { |
|
1060 if ( $count > 2 ) |
|
1061 return ''; |
|
1062 $string = wp_kses_bad_protocol_once( $string, $allowed_protocols, ++$count ); |
|
1063 if ( empty( $string ) ) |
|
1064 return $string; |
|
1065 } |
|
1066 $string = $protocol . $string; |
|
1067 } |
|
1068 |
|
1069 return $string; |
|
1070 } |
|
1071 |
|
1072 /** |
|
1073 * Callback for wp_kses_bad_protocol_once() regular expression. |
|
1074 * |
|
1075 * This function processes URL protocols, checks to see if they're in the |
|
1076 * whitelist or not, and returns different data depending on the answer. |
|
1077 * |
|
1078 * @access private |
|
1079 * @since 1.0.0 |
|
1080 * |
|
1081 * @param string $string URI scheme to check against the whitelist |
|
1082 * @param string $allowed_protocols Allowed protocols |
|
1083 * @return string Sanitized content |
|
1084 */ |
|
1085 function wp_kses_bad_protocol_once2( $string, $allowed_protocols ) { |
|
1086 $string2 = wp_kses_decode_entities($string); |
|
1087 $string2 = preg_replace('/\s/', '', $string2); |
|
1088 $string2 = wp_kses_no_null($string2); |
|
1089 $string2 = strtolower($string2); |
|
1090 |
|
1091 $allowed = false; |
|
1092 foreach ( (array) $allowed_protocols as $one_protocol ) |
|
1093 if ( strtolower($one_protocol) == $string2 ) { |
|
1094 $allowed = true; |
|
1095 break; |
|
1096 } |
|
1097 |
|
1098 if ($allowed) |
|
1099 return "$string2:"; |
|
1100 else |
|
1101 return ''; |
|
1102 } |
|
1103 |
|
1104 /** |
|
1105 * Converts and fixes HTML entities. |
|
1106 * |
|
1107 * This function normalizes HTML entities. It will convert "AT&T" to the correct |
|
1108 * "AT&T", ":" to ":", "&#XYZZY;" to "&#XYZZY;" and so on. |
|
1109 * |
|
1110 * @since 1.0.0 |
|
1111 * |
|
1112 * @param string $string Content to normalize entities |
|
1113 * @return string Content with normalized entities |
|
1114 */ |
|
1115 function wp_kses_normalize_entities($string) { |
|
1116 # Disarm all entities by converting & to & |
|
1117 |
|
1118 $string = str_replace('&', '&', $string); |
|
1119 |
|
1120 # Change back the allowed entities in our entity whitelist |
|
1121 |
|
1122 $string = preg_replace_callback('/&([A-Za-z]{2,8});/', 'wp_kses_named_entities', $string); |
|
1123 $string = preg_replace_callback('/&#(0*[0-9]{1,7});/', 'wp_kses_normalize_entities2', $string); |
|
1124 $string = preg_replace_callback('/&#[Xx](0*[0-9A-Fa-f]{1,6});/', 'wp_kses_normalize_entities3', $string); |
|
1125 |
|
1126 return $string; |
|
1127 } |
|
1128 |
|
1129 /** |
|
1130 * Callback for wp_kses_normalize_entities() regular expression. |
|
1131 * |
|
1132 * This function only accepts valid named entity references, which are finite, |
|
1133 * case-sensitive, and highly scrutinized by HTML and XML validators. |
|
1134 * |
|
1135 * @since 3.0.0 |
|
1136 * |
|
1137 * @param array $matches preg_replace_callback() matches array |
|
1138 * @return string Correctly encoded entity |
|
1139 */ |
|
1140 function wp_kses_named_entities($matches) { |
|
1141 global $allowedentitynames; |
|
1142 |
|
1143 if ( empty($matches[1]) ) |
|
1144 return ''; |
|
1145 |
|
1146 $i = $matches[1]; |
|
1147 return ( ( ! in_array($i, $allowedentitynames) ) ? "&$i;" : "&$i;" ); |
|
1148 } |
|
1149 |
|
1150 /** |
|
1151 * Callback for wp_kses_normalize_entities() regular expression. |
|
1152 * |
|
1153 * This function helps wp_kses_normalize_entities() to only accept 16-bit values |
|
1154 * and nothing more for &#number; entities. |
|
1155 * |
|
1156 * @access private |
|
1157 * @since 1.0.0 |
|
1158 * |
|
1159 * @param array $matches preg_replace_callback() matches array |
|
1160 * @return string Correctly encoded entity |
|
1161 */ |
|
1162 function wp_kses_normalize_entities2($matches) { |
|
1163 if ( empty($matches[1]) ) |
|
1164 return ''; |
|
1165 |
|
1166 $i = $matches[1]; |
|
1167 if (valid_unicode($i)) { |
|
1168 $i = str_pad(ltrim($i,'0'), 3, '0', STR_PAD_LEFT); |
|
1169 $i = "&#$i;"; |
|
1170 } else { |
|
1171 $i = "&#$i;"; |
|
1172 } |
|
1173 |
|
1174 return $i; |
|
1175 } |
|
1176 |
|
1177 /** |
|
1178 * Callback for wp_kses_normalize_entities() for regular expression. |
|
1179 * |
|
1180 * This function helps wp_kses_normalize_entities() to only accept valid Unicode |
|
1181 * numeric entities in hex form. |
|
1182 * |
|
1183 * @access private |
|
1184 * |
|
1185 * @param array $matches preg_replace_callback() matches array |
|
1186 * @return string Correctly encoded entity |
|
1187 */ |
|
1188 function wp_kses_normalize_entities3($matches) { |
|
1189 if ( empty($matches[1]) ) |
|
1190 return ''; |
|
1191 |
|
1192 $hexchars = $matches[1]; |
|
1193 return ( ( ! valid_unicode(hexdec($hexchars)) ) ? "&#x$hexchars;" : '&#x'.ltrim($hexchars,'0').';' ); |
|
1194 } |
|
1195 |
|
1196 /** |
|
1197 * Helper function to determine if a Unicode value is valid. |
|
1198 * |
|
1199 * @param int $i Unicode value |
|
1200 * @return bool True if the value was a valid Unicode number |
|
1201 */ |
|
1202 function valid_unicode($i) { |
|
1203 return ( $i == 0x9 || $i == 0xa || $i == 0xd || |
|
1204 ($i >= 0x20 && $i <= 0xd7ff) || |
|
1205 ($i >= 0xe000 && $i <= 0xfffd) || |
|
1206 ($i >= 0x10000 && $i <= 0x10ffff) ); |
|
1207 } |
|
1208 |
|
1209 /** |
|
1210 * Convert all entities to their character counterparts. |
|
1211 * |
|
1212 * This function decodes numeric HTML entities (A and A). It doesn't do |
|
1213 * anything with other entities like ä, but we don't need them in the URL |
|
1214 * protocol whitelisting system anyway. |
|
1215 * |
|
1216 * @since 1.0.0 |
|
1217 * |
|
1218 * @param string $string Content to change entities |
|
1219 * @return string Content after decoded entities |
|
1220 */ |
|
1221 function wp_kses_decode_entities($string) { |
|
1222 $string = preg_replace_callback('/&#([0-9]+);/', '_wp_kses_decode_entities_chr', $string); |
|
1223 $string = preg_replace_callback('/&#[Xx]([0-9A-Fa-f]+);/', '_wp_kses_decode_entities_chr_hexdec', $string); |
|
1224 |
|
1225 return $string; |
|
1226 } |
|
1227 |
|
1228 /** |
|
1229 * Regex callback for wp_kses_decode_entities() |
|
1230 * |
|
1231 * @param array $match preg match |
|
1232 * @return string |
|
1233 */ |
|
1234 function _wp_kses_decode_entities_chr( $match ) { |
|
1235 return chr( $match[1] ); |
|
1236 } |
|
1237 |
|
1238 /** |
|
1239 * Regex callback for wp_kses_decode_entities() |
|
1240 * |
|
1241 * @param array $match preg match |
|
1242 * @return string |
|
1243 */ |
|
1244 function _wp_kses_decode_entities_chr_hexdec( $match ) { |
|
1245 return chr( hexdec( $match[1] ) ); |
|
1246 } |
|
1247 |
|
1248 /** |
|
1249 * Sanitize content with allowed HTML Kses rules. |
|
1250 * |
|
1251 * @since 1.0.0 |
|
1252 * @uses $allowedtags |
|
1253 * |
|
1254 * @param string $data Content to filter, expected to be escaped with slashes |
|
1255 * @return string Filtered content |
|
1256 */ |
|
1257 function wp_filter_kses( $data ) { |
|
1258 return addslashes( wp_kses( stripslashes( $data ), current_filter() ) ); |
|
1259 } |
|
1260 |
|
1261 /** |
|
1262 * Sanitize content with allowed HTML Kses rules. |
|
1263 * |
|
1264 * @since 2.9.0 |
|
1265 * @uses $allowedtags |
|
1266 * |
|
1267 * @param string $data Content to filter, expected to not be escaped |
|
1268 * @return string Filtered content |
|
1269 */ |
|
1270 function wp_kses_data( $data ) { |
|
1271 return wp_kses( $data , current_filter() ); |
|
1272 } |
|
1273 |
|
1274 /** |
|
1275 * Sanitize content for allowed HTML tags for post content. |
|
1276 * |
|
1277 * Post content refers to the page contents of the 'post' type and not $_POST |
|
1278 * data from forms. |
|
1279 * |
|
1280 * @since 2.0.0 |
|
1281 * |
|
1282 * @param string $data Post content to filter, expected to be escaped with slashes |
|
1283 * @return string Filtered post content with allowed HTML tags and attributes intact. |
|
1284 */ |
|
1285 function wp_filter_post_kses($data) { |
|
1286 return addslashes ( wp_kses( stripslashes( $data ), 'post' ) ); |
|
1287 } |
|
1288 |
|
1289 /** |
|
1290 * Sanitize content for allowed HTML tags for post content. |
|
1291 * |
|
1292 * Post content refers to the page contents of the 'post' type and not $_POST |
|
1293 * data from forms. |
|
1294 * |
|
1295 * @since 2.9.0 |
|
1296 * |
|
1297 * @param string $data Post content to filter |
|
1298 * @return string Filtered post content with allowed HTML tags and attributes intact. |
|
1299 */ |
|
1300 function wp_kses_post($data) { |
|
1301 return wp_kses( $data , 'post' ); |
|
1302 } |
|
1303 |
|
1304 /** |
|
1305 * Strips all of the HTML in the content. |
|
1306 * |
|
1307 * @since 2.1.0 |
|
1308 * |
|
1309 * @param string $data Content to strip all HTML from |
|
1310 * @return string Filtered content without any HTML |
|
1311 */ |
|
1312 function wp_filter_nohtml_kses( $data ) { |
|
1313 return addslashes ( wp_kses( stripslashes( $data ), 'strip' ) ); |
|
1314 } |
|
1315 |
|
1316 /** |
|
1317 * Adds all Kses input form content filters. |
|
1318 * |
|
1319 * All hooks have default priority. The wp_filter_kses() function is added to |
|
1320 * the 'pre_comment_content' and 'title_save_pre' hooks. |
|
1321 * |
|
1322 * The wp_filter_post_kses() function is added to the 'content_save_pre', |
|
1323 * 'excerpt_save_pre', and 'content_filtered_save_pre' hooks. |
|
1324 * |
|
1325 * @since 2.0.0 |
|
1326 * @uses add_filter() See description for what functions are added to what hooks. |
|
1327 */ |
|
1328 function kses_init_filters() { |
|
1329 // Normal filtering |
|
1330 add_filter('title_save_pre', 'wp_filter_kses'); |
|
1331 |
|
1332 // Comment filtering |
|
1333 if ( current_user_can( 'unfiltered_html' ) ) |
|
1334 add_filter( 'pre_comment_content', 'wp_filter_post_kses' ); |
|
1335 else |
|
1336 add_filter( 'pre_comment_content', 'wp_filter_kses' ); |
|
1337 |
|
1338 // Post filtering |
|
1339 add_filter('content_save_pre', 'wp_filter_post_kses'); |
|
1340 add_filter('excerpt_save_pre', 'wp_filter_post_kses'); |
|
1341 add_filter('content_filtered_save_pre', 'wp_filter_post_kses'); |
|
1342 } |
|
1343 |
|
1344 /** |
|
1345 * Removes all Kses input form content filters. |
|
1346 * |
|
1347 * A quick procedural method to removing all of the filters that kses uses for |
|
1348 * content in WordPress Loop. |
|
1349 * |
|
1350 * Does not remove the kses_init() function from 'init' hook (priority is |
|
1351 * default). Also does not remove kses_init() function from 'set_current_user' |
|
1352 * hook (priority is also default). |
|
1353 * |
|
1354 * @since 2.0.6 |
|
1355 */ |
|
1356 function kses_remove_filters() { |
|
1357 // Normal filtering |
|
1358 remove_filter('title_save_pre', 'wp_filter_kses'); |
|
1359 |
|
1360 // Comment filtering |
|
1361 remove_filter( 'pre_comment_content', 'wp_filter_post_kses' ); |
|
1362 remove_filter( 'pre_comment_content', 'wp_filter_kses' ); |
|
1363 |
|
1364 // Post filtering |
|
1365 remove_filter('content_save_pre', 'wp_filter_post_kses'); |
|
1366 remove_filter('excerpt_save_pre', 'wp_filter_post_kses'); |
|
1367 remove_filter('content_filtered_save_pre', 'wp_filter_post_kses'); |
|
1368 } |
|
1369 |
|
1370 /** |
|
1371 * Sets up most of the Kses filters for input form content. |
|
1372 * |
|
1373 * If you remove the kses_init() function from 'init' hook and |
|
1374 * 'set_current_user' (priority is default), then none of the Kses filter hooks |
|
1375 * will be added. |
|
1376 * |
|
1377 * First removes all of the Kses filters in case the current user does not need |
|
1378 * to have Kses filter the content. If the user does not have unfiltered_html |
|
1379 * capability, then Kses filters are added. |
|
1380 * |
|
1381 * @uses kses_remove_filters() Removes the Kses filters |
|
1382 * @uses kses_init_filters() Adds the Kses filters back if the user |
|
1383 * does not have unfiltered HTML capability. |
|
1384 * @since 2.0.0 |
|
1385 */ |
|
1386 function kses_init() { |
|
1387 kses_remove_filters(); |
|
1388 |
|
1389 if (current_user_can('unfiltered_html') == false) |
|
1390 kses_init_filters(); |
|
1391 } |
|
1392 |
|
1393 add_action('init', 'kses_init'); |
|
1394 add_action('set_current_user', 'kses_init'); |
|
1395 |
|
1396 /** |
|
1397 * Inline CSS filter |
|
1398 * |
|
1399 * @since 2.8.1 |
|
1400 */ |
|
1401 function safecss_filter_attr( $css, $deprecated = '' ) { |
|
1402 if ( !empty( $deprecated ) ) |
|
1403 _deprecated_argument( __FUNCTION__, '2.8.1' ); // Never implemented |
|
1404 |
|
1405 $css = wp_kses_no_null($css); |
|
1406 $css = str_replace(array("\n","\r","\t"), '', $css); |
|
1407 |
|
1408 if ( preg_match( '%[\\(&=}]|/\*%', $css ) ) // remove any inline css containing \ ( & } = or comments |
|
1409 return ''; |
|
1410 |
|
1411 $css_array = explode( ';', trim( $css ) ); |
|
1412 $allowed_attr = apply_filters( 'safe_style_css', array( 'text-align', 'margin', 'color', 'float', |
|
1413 'border', 'background', 'background-color', 'border-bottom', 'border-bottom-color', |
|
1414 'border-bottom-style', 'border-bottom-width', 'border-collapse', 'border-color', 'border-left', |
|
1415 'border-left-color', 'border-left-style', 'border-left-width', 'border-right', 'border-right-color', |
|
1416 'border-right-style', 'border-right-width', 'border-spacing', 'border-style', 'border-top', |
|
1417 'border-top-color', 'border-top-style', 'border-top-width', 'border-width', 'caption-side', |
|
1418 'clear', 'cursor', 'direction', 'font', 'font-family', 'font-size', 'font-style', |
|
1419 'font-variant', 'font-weight', 'height', 'letter-spacing', 'line-height', 'margin-bottom', |
|
1420 'margin-left', 'margin-right', 'margin-top', 'overflow', 'padding', 'padding-bottom', |
|
1421 'padding-left', 'padding-right', 'padding-top', 'text-decoration', 'text-indent', 'vertical-align', |
|
1422 'width' ) ); |
|
1423 |
|
1424 if ( empty($allowed_attr) ) |
|
1425 return $css; |
|
1426 |
|
1427 $css = ''; |
|
1428 foreach ( $css_array as $css_item ) { |
|
1429 if ( $css_item == '' ) |
|
1430 continue; |
|
1431 $css_item = trim( $css_item ); |
|
1432 $found = false; |
|
1433 if ( strpos( $css_item, ':' ) === false ) { |
|
1434 $found = true; |
|
1435 } else { |
|
1436 $parts = explode( ':', $css_item ); |
|
1437 if ( in_array( trim( $parts[0] ), $allowed_attr ) ) |
|
1438 $found = true; |
|
1439 } |
|
1440 if ( $found ) { |
|
1441 if( $css != '' ) |
|
1442 $css .= ';'; |
|
1443 $css .= $css_item; |
|
1444 } |
|
1445 } |
|
1446 |
|
1447 return $css; |
|
1448 } |
|
1449 |
|
1450 /** |
|
1451 * Helper function to add global attributes to a tag in the allowed html list. |
|
1452 * |
|
1453 * @since 3.5.0 |
|
1454 * @access private |
|
1455 * |
|
1456 * @param array $value An array of attributes. |
|
1457 * @return array The array of attributes with global attributes added. |
|
1458 */ |
|
1459 function _wp_add_global_attributes( $value ) { |
|
1460 $global_attributes = array( |
|
1461 'class' => true, |
|
1462 'id' => true, |
|
1463 'style' => true, |
|
1464 'title' => true, |
|
1465 ); |
|
1466 |
|
1467 if ( true === $value ) |
|
1468 $value = array(); |
|
1469 |
|
1470 if ( is_array( $value ) ) |
|
1471 return array_merge( $value, $global_attributes ); |
|
1472 |
|
1473 return $value; |
|
1474 } |