| 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_ADMIN_CONTEXT')) {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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