1 | <?php |
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2 | class DiskCache { |
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3 | private $dir; |
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4 | |||
5 | public function __construct($dir) { |
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6 | $this->dir = CACHE_DIR."/".clean_filename($dir); |
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7 | } |
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8 | |||
9 | public function getDir() { |
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10 | return $this->dir; |
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11 | } |
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12 | |||
13 | public function makeDir() { |
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14 | if (!is_dir($this->dir)) { |
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15 | return mkdir($this->dir); |
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16 | } |
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17 | } |
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18 | |||
19 | public function isWritable($filename = "") { |
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20 | if ($filename) { |
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21 | if (file_exists($this->getFullPath($filename))) { |
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22 | return is_writable($this->getFullPath($filename)); |
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23 | } else { |
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24 | return is_writable($this->dir); |
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25 | } |
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26 | } else { |
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27 | return is_writable($this->dir); |
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28 | } |
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29 | } |
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30 | |||
31 | public function exists($filename) { |
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32 | return file_exists($this->getFullPath($filename)); |
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33 | } |
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34 | |||
35 | public function getSize($filename) { |
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36 | if ($this->exists($filename)) { |
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37 | return filesize($this->getFullPath($filename)); |
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38 | } else { |
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39 | return -1; |
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40 | } |
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41 | } |
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42 | |||
43 | public function getFullPath($filename) { |
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44 | $filename = clean_filename($filename); |
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45 | |||
46 | return $this->dir."/".$filename; |
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47 | } |
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48 | |||
49 | public function put($filename, $data) { |
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50 | return file_put_contents($this->getFullPath($filename), $data); |
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51 | } |
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52 | |||
53 | public function touch($filename) { |
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54 | return touch($this->getFullPath($filename)); |
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55 | } |
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56 | |||
57 | public function get($filename) { |
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58 | if ($this->exists($filename)) { |
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59 | return file_get_contents($this->getFullPath($filename)); |
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60 | } else { |
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61 | return null; |
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62 | } |
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63 | } |
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64 | |||
65 | public function getMimeType($filename) { |
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66 | if ($this->exists($filename)) { |
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67 | return mime_content_type($this->getFullPath($filename)); |
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68 | } else { |
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69 | return null; |
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70 | } |
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71 | } |
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72 | |||
73 | public function send($filename) { |
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74 | header("Content-Disposition: inline; filename=\"$filename\""); |
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75 | |||
76 | return send_local_file($this->getFullPath($filename)); |
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77 | } |
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78 | |||
79 | public function getUrl($filename) { |
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80 | return get_self_url_prefix()."/public.php?op=cached_url&file=".basename($this->dir)."/".$filename; |
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81 | } |
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82 | |||
83 | // check for locally cached (media) URLs and rewrite to local versions |
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84 | // this is called separately after sanitize() and plugin render article hooks to allow |
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85 | // plugins work on original source URLs used before caching |
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86 | static public function rewriteUrls($str) |
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87 | { |
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88 | $res = trim($str); |
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89 | if (!$res) { |
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90 | return ''; |
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91 | } |
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92 | |||
93 | $doc = new DOMDocument(); |
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94 | if ($doc->loadHTML('<?xml encoding="UTF-8">'.$res)) { |
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95 | $xpath = new DOMXPath($doc); |
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96 | $cache = new DiskCache("images"); |
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97 | |||
98 | $entries = $xpath->query('(//img[@src]|//picture/source[@src]|//video[@poster]|//video/source[@src]|//audio/source[@src])'); |
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99 | |||
100 | $need_saving = false; |
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101 | |||
102 | foreach ($entries as $entry) { |
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103 | |||
104 | if ($entry->hasAttribute('src') || $entry->hasAttribute('poster')) { |
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105 | |||
106 | // should be already absolutized because this is called after sanitize() |
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107 | $src = $entry->hasAttribute('poster') ? $entry->getAttribute('poster') : $entry->getAttribute('src'); |
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108 | $cached_filename = sha1($src); |
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109 | |||
110 | if ($cache->exists($cached_filename)) { |
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111 | |||
112 | $src = $cache->getUrl(sha1($src)); |
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113 | |||
114 | if ($entry->hasAttribute('poster')) { |
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115 | $entry->setAttribute('poster', $src); |
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116 | } else { |
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117 | $entry->setAttribute('src', $src); |
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118 | $entry->removeAttribute("srcset"); |
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119 | } |
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120 | |||
121 | $need_saving = true; |
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122 | } |
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123 | } |
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124 | } |
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125 | |||
126 | if ($need_saving) { |
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127 | $doc->removeChild($doc->firstChild); //remove doctype |
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128 | $res = $doc->saveHTML(); |
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129 | } |
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130 | } |
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131 | return $res; |
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132 | } |
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133 | |||
134 | public static function expire() { |
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135 | $dirs = array_filter(glob(CACHE_DIR."/*"), "is_dir"); |
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136 | |||
137 | foreach ($dirs as $cache_dir) { |
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138 | $num_deleted = 0; |
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139 | |||
140 | if (is_writable($cache_dir) && !file_exists("$cache_dir/.no-auto-expiry")) { |
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141 | $files = glob("$cache_dir/*"); |
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142 | |||
143 | if ($files) { |
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144 | foreach ($files as $file) { |
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145 | if (time() - filemtime($file) > 86400 * CACHE_MAX_DAYS) { |
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146 | unlink($file); |
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147 | |||
148 | ++$num_deleted; |
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149 | } |
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150 | } |
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151 | } |
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152 | |||
153 | Debug::log("expired $cache_dir: removed $num_deleted files."); |
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154 | } |
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155 | } |
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156 | } |
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157 | } |
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158 |