1 | <?php |
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2 | /** |
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3 | * @package Dotclear |
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4 | * @subpackage Backend |
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5 | * |
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6 | * @copyright Olivier Meunier & Association Dotclear |
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7 | * @copyright GPL-2.0-only |
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8 | */ |
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9 | |
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10 | if (!defined('DC_CONTEXT_ADMIN')) {return;} |
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11 | |
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12 | /** |
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13 | * @brief Helper for theme configurators. |
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14 | * @since 2.7 |
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15 | * |
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16 | * Provides helper tools for theme configurators. |
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17 | */ |
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18 | class dcThemeConfig |
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19 | { |
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20 | |
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21 | /** |
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22 | * Compute contrast ratio between two colors |
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23 | * |
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24 | * @param string $color text color |
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25 | * @param string $background background color |
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26 | * |
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27 | * @return float computed ratio |
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28 | */ |
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29 | public static function computeContrastRatio($color, $background) |
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30 | { |
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31 | // Compute contrast ratio between two colors |
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32 | |
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33 | $color = self::adjustColor($color); |
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34 | if (($color == '') || (strlen($color) != 7)) { |
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35 | return 0; |
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36 | } |
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37 | |
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38 | $background = self::adjustColor($background); |
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39 | if (($background == '') || (strlen($background) != 7)) { |
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40 | return 0; |
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41 | } |
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42 | |
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43 | $l1 = (0.2126 * pow(hexdec(substr($color, 1, 2)) / 255, 2.2)) + |
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44 | (0.7152 * pow(hexdec(substr($color, 3, 2)) / 255, 2.2)) + |
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45 | (0.0722 * pow(hexdec(substr($color, 5, 2)) / 255, 2.2)); |
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46 | |
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47 | $l2 = (0.2126 * pow(hexdec(substr($background, 1, 2)) / 255, 2.2)) + |
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48 | (0.7152 * pow(hexdec(substr($background, 3, 2)) / 255, 2.2)) + |
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49 | (0.0722 * pow(hexdec(substr($background, 5, 2)) / 255, 2.2)); |
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50 | |
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51 | if ($l1 > $l2) { |
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52 | $ratio = ($l1 + 0.05) / ($l2 + 0.05); |
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53 | } else { |
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54 | $ratio = ($l2 + 0.05) / ($l1 + 0.05); |
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55 | } |
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56 | return $ratio; |
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57 | } |
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58 | |
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59 | /** |
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60 | * Compute WCAG contrast ration level |
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61 | * |
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62 | * @param float $ratio computed ratio between foreground and backround color |
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63 | * @param string $size font size as defined in CSS |
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64 | * @param boolean $bold true if bold font |
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65 | * |
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66 | * @return string WCAG contrast ratio level (AAA, AA or <nothing>) |
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67 | */ |
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68 | public static function contrastRatioLevel($ratio, $size, $bold = false) |
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69 | { |
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70 | if ($size == '') { |
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71 | return ''; |
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72 | } |
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73 | |
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74 | // Eval font size in em (assume base font size in pixels equal to 16) |
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75 | if (preg_match('/^([0-9.]+)\s*(%|pt|px|em|ex|rem)?$/', $size, $m)) { |
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76 | if (empty($m[2])) { |
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77 | $m[2] = 'em'; |
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78 | } |
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79 | } else { |
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80 | return ''; |
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81 | } |
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82 | switch ($m[2]) { |
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83 | case '%': |
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84 | $s = (float) $m[1] / 100; |
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85 | break; |
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86 | case 'pt': |
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87 | $s = (float) $m[1] / 12; |
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88 | break; |
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89 | case 'px': |
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90 | $s = (float) $m[1] / 16; |
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91 | break; |
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92 | case 'em': |
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93 | $s = (float) $m[1]; |
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94 | break; |
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95 | case 'ex': |
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96 | $s = (float) $m[1] / 2; |
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97 | break; |
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98 | default: |
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99 | return ''; |
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100 | } |
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101 | |
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102 | $large = ((($s > 1.5) && ($bold == false)) || (($s > 1.2) && ($bold == true))); |
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103 | |
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104 | // Check ratio |
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105 | if ($ratio > 7) { |
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106 | return 'AAA'; |
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107 | } elseif (($ratio > 4.5) && $large) { |
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108 | return 'AAA'; |
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109 | } elseif ($ratio > 4.5) { |
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110 | return 'AA'; |
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111 | } elseif (($ratio > 3) && $large) { |
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112 | return 'AA'; |
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113 | } |
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114 | return ''; |
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115 | } |
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116 | |
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117 | /** |
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118 | * Return full information about constrat ratio |
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119 | * |
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120 | * @param string $color text color |
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121 | * @param string $background background color |
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122 | * @param string $size font size |
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123 | * @param boolean $bold bold font |
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124 | * |
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125 | * @return string contrast ratio including WCAG level |
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126 | */ |
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127 | public static function contrastRatio($color, $background, $size = '', $bold = false) |
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128 | { |
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129 | if (($color != '') && ($background != '')) { |
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130 | $ratio = self::computeContrastRatio($color, $background); |
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131 | $level = self::contrastRatioLevel($ratio, $size, $bold); |
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132 | return |
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133 | sprintf(__('ratio %.1f'), $ratio) . |
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134 | ($level != '' ? ' ' . sprintf(__('(%s)'), $level) : ''); |
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135 | } |
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136 | return ''; |
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137 | } |
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138 | |
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139 | /** |
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140 | * Check font size |
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141 | * |
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142 | * @param string $s font size |
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143 | * |
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144 | * @return string checked font size |
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145 | */ |
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146 | public static function adjustFontSize($s) |
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147 | { |
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148 | if (preg_match('/^([0-9.]+)\s*(%|pt|px|em|ex|rem)?$/', $s, $m)) { |
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149 | if (empty($m[2])) { |
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150 | $m[2] = 'em'; |
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151 | } |
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152 | return $m[1] . $m[2]; |
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153 | } |
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154 | return; |
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155 | } |
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156 | |
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157 | /** |
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158 | * Check object position, should be x:y |
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159 | * |
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160 | * @param string $p position |
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161 | * |
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162 | * @return string checked position |
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163 | */ |
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164 | public static function adjustPosition($p) |
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165 | { |
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166 | if (!preg_match('/^[0-9]+(:[0-9]+)?$/', $p)) { |
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167 | return; |
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168 | } |
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169 | $p = explode(':', $p); |
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170 | |
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171 | return $p[0] . (count($p) == 1 ? ':0' : ':' . $p[1]); |
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172 | } |
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173 | |
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174 | /** |
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175 | * Check a CSS color |
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176 | * |
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177 | * @param string $c CSS color |
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178 | * |
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179 | * @return string checked CSS color |
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180 | */ |
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181 | public static function adjustColor($c) |
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182 | { |
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183 | if ($c === '') { |
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184 | return ''; |
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185 | } |
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186 | |
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187 | $c = strtoupper($c); |
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188 | |
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189 | if (preg_match('/^[A-F0-9]{3,6}$/', $c)) { |
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190 | $c = '#' . $c; |
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191 | } |
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192 | if (preg_match('/^#[A-F0-9]{6}$/', $c)) { |
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193 | return $c; |
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194 | } |
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195 | if (preg_match('/^#[A-F0-9]{3,}$/', $c)) { |
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196 | return '#' . substr($c, 1, 1) . substr($c, 1, 1) . substr($c, 2, 1) . substr($c, 2, 1) . substr($c, 3, 1) . substr($c, 3, 1); |
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197 | } |
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198 | |
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199 | return ''; |
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200 | } |
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201 | |
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202 | /** |
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203 | * Check and clean CSS |
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204 | * |
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205 | * @param string $css CSS to be checked |
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206 | * |
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207 | * @return string checked CSS |
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208 | */ |
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209 | public static function cleanCSS($css) |
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210 | { |
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211 | // TODO ? |
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212 | return $css; |
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213 | } |
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214 | |
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215 | /** |
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216 | * Return real path of a user defined CSS |
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217 | * |
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218 | * @param string $folder CSS folder |
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219 | * |
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220 | * @return string real path of CSS |
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221 | */ |
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222 | public static function cssPath($folder) |
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223 | { |
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224 | global $core; |
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225 | return path::real($core->blog->public_path) . '/' . $folder; |
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226 | } |
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227 | |
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228 | /** |
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229 | * Retirn URL of a user defined CSS |
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230 | * |
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231 | * @param string $folder CSS folder |
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232 | * |
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233 | * @return string CSS URL |
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234 | */ |
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235 | public static function cssURL($folder) |
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236 | { |
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237 | global $core; |
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238 | return $core->blog->settings->system->public_url . '/' . $folder; |
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239 | } |
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240 | |
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241 | /** |
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242 | * Check if user defined CSS may be written |
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243 | * |
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244 | * @param string $folder CSS folder |
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245 | * @param boolean $create create CSS folder if necessary |
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246 | * |
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247 | * @return boolean true if CSS folder exists and may be written, else false |
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248 | */ |
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249 | public static function canWriteCss($folder, $create = false) |
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250 | { |
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251 | global $core; |
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252 | |
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253 | $public = path::real($core->blog->public_path); |
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254 | $css = self::cssPath($folder); |
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255 | |
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256 | if (!is_dir($public)) { |
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257 | $core->error->add(__('The \'public\' directory does not exist.')); |
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258 | return false; |
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259 | } |
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260 | |
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261 | if (!is_dir($css)) { |
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262 | if (!is_writable($public)) { |
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263 | $core->error->add(sprintf(__('The \'%s\' directory cannot be modified.'), 'public')); |
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264 | return false; |
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265 | } |
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266 | if ($create) { |
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267 | files::makeDir($css); |
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268 | } |
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269 | return true; |
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270 | } |
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271 | |
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272 | if (!is_writable($css)) { |
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273 | $core->error->add(sprintf(__('The \'%s\' directory cannot be modified.'), 'public/' . $folder)); |
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274 | return false; |
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275 | } |
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276 | |
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277 | return true; |
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278 | } |
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279 | |
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280 | /** |
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281 | * Store CSS property value in associated array |
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282 | * |
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283 | * @param array $css CSS associated array |
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284 | * @param string $selector selector |
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285 | * @param string $prop property |
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286 | * @param string $value value |
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287 | */ |
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288 | public static function prop(&$css, $selector, $prop, $value) |
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289 | { |
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290 | if ($value) { |
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291 | $css[$selector][$prop] = $value; |
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292 | } |
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293 | } |
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294 | |
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295 | /** |
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296 | * Store background image property in CSS associated array |
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297 | * |
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298 | * @param string $folder image folder |
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299 | * @param array $css CSS associated array |
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300 | * @param string $selector selector |
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301 | * @param boolean $value false for default, true if image should be set |
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302 | * @param string $image image filename |
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303 | */ |
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304 | public static function backgroundImg($folder, &$css, $selector, $value, $image) |
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305 | { |
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306 | $file = self::imagesPath($folder) . '/' . $image; |
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307 | if ($value && file_exists($file)) { |
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308 | $css[$selector]['background-image'] = 'url(' . self::imagesURL($folder) . '/' . $image . ')'; |
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309 | } |
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310 | } |
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311 | |
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312 | /** |
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313 | * Write CSS file |
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314 | * |
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315 | * @param string $folder CSS folder |
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316 | * @param string $theme CSS filename |
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317 | * @param string $css CSS file content |
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318 | */ |
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319 | public static function writeCss($folder, $theme, $css) |
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320 | { |
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321 | file_put_contents(self::cssPath($folder) . '/' . $theme . '.css', $css); |
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322 | } |
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323 | |
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324 | /** |
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325 | * Delete CSS file |
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326 | * |
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327 | * @param string $folder CSS folder |
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328 | * @param string $theme CSS filename to be removed |
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329 | */ |
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330 | public static function dropCss($folder, $theme) |
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331 | { |
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332 | $file = path::real(self::cssPath($folder) . '/' . $theme . '.css'); |
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333 | if (is_writable(dirname($file))) { |
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334 | @unlink($file); |
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335 | } |
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336 | } |
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337 | |
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338 | /** |
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339 | * Return public URL of user defined CSS |
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340 | * |
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341 | * @param string $folder CSS folder |
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342 | * |
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343 | * @return string CSS file URL |
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344 | */ |
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345 | public static function publicCssUrlHelper($folder) |
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346 | { |
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347 | $theme = $GLOBALS['core']->blog->settings->system->theme; |
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348 | $url = self::cssURL($folder); |
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349 | $path = self::cssPath($folder); |
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350 | |
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351 | if (file_exists($path . '/' . $theme . '.css')) { |
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352 | return $url . '/' . $theme . '.css'; |
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353 | } |
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354 | |
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355 | return; |
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356 | } |
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357 | |
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358 | /** |
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359 | * Return real path of folder images |
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360 | * |
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361 | * @param string $folder images folder |
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362 | * |
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363 | * @return string real path of folder |
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364 | */ |
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365 | public static function imagesPath($folder) |
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366 | { |
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367 | global $core; |
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368 | return path::real($core->blog->public_path) . '/' . $folder; |
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369 | } |
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370 | |
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371 | /** |
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372 | * Return URL of images folder |
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373 | * |
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374 | * @param string $folder images folder |
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375 | * |
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376 | * @return string URL of images folder |
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377 | */ |
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378 | public static function imagesURL($folder) |
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379 | { |
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380 | global $core; |
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381 | return $core->blog->settings->system->public_url . '/' . $folder; |
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382 | } |
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383 | |
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384 | /** |
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385 | * Check if images folder exists and may be written |
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386 | * |
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387 | * @param string $folder images folder |
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388 | * @param boolean $create create the folder if not exists |
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389 | * |
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390 | * @return boolean true if folder exists and may be written |
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391 | */ |
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392 | public static function canWriteImages($folder, $create = false) |
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393 | { |
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394 | global $core; |
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395 | |
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396 | $public = path::real($core->blog->public_path); |
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397 | $imgs = self::imagesPath($folder); |
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398 | |
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399 | if (!function_exists('imagecreatetruecolor') || !function_exists('imagepng') || !function_exists('imagecreatefrompng')) { |
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400 | $core->error->add(__('At least one of the following functions is not available: ' . |
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401 | 'imagecreatetruecolor, imagepng & imagecreatefrompng.')); |
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402 | return false; |
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403 | } |
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404 | |
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405 | if (!is_dir($public)) { |
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406 | $core->error->add(__('The \'public\' directory does not exist.')); |
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407 | return false; |
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408 | } |
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409 | |
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410 | if (!is_dir($imgs)) { |
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411 | if (!is_writable($public)) { |
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412 | $core->error->add(sprintf(__('The \'%s\' directory cannot be modified.'), 'public')); |
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413 | return false; |
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414 | } |
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415 | if ($create) { |
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416 | files::makeDir($imgs); |
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417 | } |
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418 | return true; |
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419 | } |
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420 | |
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421 | if (!is_writable($imgs)) { |
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422 | $core->error->add(sprintf(__('The \'%s\' directory cannot be modified.'), 'public/' . $folder)); |
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423 | return false; |
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424 | } |
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425 | |
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426 | return true; |
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427 | } |
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428 | |
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429 | /** |
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430 | * Upload an image in images folder |
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431 | * |
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432 | * @param string $folder images folder |
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433 | * @param string $f selected image file (as $_FILES[<file input fieldname>]) |
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434 | * @param int $width check accurate width of uploaded image if <> 0 |
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435 | * |
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436 | * @return string full pathname of uploaded image |
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437 | */ |
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438 | public static function uploadImage($folder, $f, $width = 0) |
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439 | { |
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440 | if (!self::canWriteImages($folder, true)) { |
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441 | throw new Exception(__('Unable to create images.')); |
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442 | } |
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443 | |
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444 | $name = $f['name']; |
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445 | $type = files::getMimeType($name); |
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446 | |
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447 | if ($type != 'image/jpeg' && $type != 'image/png') { |
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448 | throw new Exception(__('Invalid file type.')); |
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449 | } |
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450 | |
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451 | $dest = self::imagesPath($folder) . '/uploaded' . ($type == 'image/png' ? '.png' : '.jpg'); |
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452 | |
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453 | if (@move_uploaded_file($f['tmp_name'], $dest) === false) { |
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454 | throw new Exception(__('An error occurred while writing the file.')); |
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455 | } |
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456 | |
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457 | if ($width) { |
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458 | $s = getimagesize($dest); |
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459 | if ($s[0] != $width) { |
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460 | throw new Exception(sprintf(__('Uploaded image is not %s pixels wide.'), $width)); |
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461 | } |
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462 | } |
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463 | |
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464 | return $dest; |
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465 | } |
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466 | |
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467 | /** |
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468 | * Delete an image from images folder (with its thumbnails if any) |
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469 | * |
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470 | * @param string $folder images folder |
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471 | * @param string $img image filename |
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472 | */ |
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473 | public static function dropImage($folder, $img) |
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474 | { |
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475 | global $core; |
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476 | |
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477 | $img = path::real(self::imagesPath($folder) . '/' . $img); |
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478 | if (is_writable(dirname($img))) { |
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479 | // Delete thumbnails if any |
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480 | try { |
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481 | $media = new dcMedia($core); |
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482 | $media->imageThumbRemove($img); |
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483 | } catch (Exception $e) { |
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484 | $core->error->add($e->getMessage()); |
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485 | } |
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486 | // Delete image |
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487 | @unlink($img); |
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488 | } |
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489 | } |
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490 | } |
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