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<?php |
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class DiskCache { |
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private $dir; |
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public function __construct($dir) { |
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$this->dir = CACHE_DIR."/".clean_filename($dir); |
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} |
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public function getDir() { |
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return $this->dir; |
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} |
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public function makeDir() { |
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if (!is_dir($this->dir)) { |
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return mkdir($this->dir); |
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} |
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} |
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public function isWritable($filename = "") { |
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if ($filename) { |
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if (file_exists($this->getFullPath($filename))) { |
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return is_writable($this->getFullPath($filename)); |
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} else { |
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return is_writable($this->dir); |
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} |
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} else { |
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return is_writable($this->dir); |
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} |
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} |
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public function exists($filename) { |
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return file_exists($this->getFullPath($filename)); |
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} |
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public function getSize($filename) { |
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if ($this->exists($filename)) { |
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return filesize($this->getFullPath($filename)); |
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} else { |
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return -1; |
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} |
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} |
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public function getFullPath($filename) { |
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$filename = clean_filename($filename); |
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return $this->dir."/".$filename; |
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} |
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public function put($filename, $data) { |
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return file_put_contents($this->getFullPath($filename), $data); |
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} |
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public function touch($filename) { |
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return touch($this->getFullPath($filename)); |
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} |
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public function get($filename) { |
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if ($this->exists($filename)) { |
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return file_get_contents($this->getFullPath($filename)); |
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} else { |
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return null; |
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} |
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} |
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public function getMimeType($filename) { |
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if ($this->exists($filename)) { |
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return mime_content_type($this->getFullPath($filename)); |
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} else { |
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return null; |
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} |
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} |
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public function send($filename) { |
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header("Content-Disposition: inline; filename=\"$filename\""); |
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return send_local_file($this->getFullPath($filename)); |
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} |
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public function getUrl($filename) { |
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return get_self_url_prefix()."/public.php?op=cached_url&file=".basename($this->dir)."/".$filename; |
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} |
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// check for locally cached (media) URLs and rewrite to local versions |
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// this is called separately after sanitize() and plugin render article hooks to allow |
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// plugins work on original source URLs used before caching |
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static public function rewriteUrls($str) |
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{ |
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$res = trim($str); |
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if (!$res) { |
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return ''; |
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} |
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$doc = new DOMDocument(); |
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if ($doc->loadHTML('<?xml encoding="UTF-8">'.$res)) { |
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$xpath = new DOMXPath($doc); |
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$cache = new DiskCache("images"); |
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$entries = $xpath->query('(//img[@src]|//picture/source[@src]|//video[@poster]|//video/source[@src]|//audio/source[@src])'); |
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$need_saving = false; |
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foreach ($entries as $entry) { |
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if ($entry->hasAttribute('src') || $entry->hasAttribute('poster')) { |
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// should be already absolutized because this is called after sanitize() |
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$src = $entry->hasAttribute('poster') ? $entry->getAttribute('poster') : $entry->getAttribute('src'); |
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$cached_filename = sha1($src); |
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if ($cache->exists($cached_filename)) { |
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$src = $cache->getUrl(sha1($src)); |
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if ($entry->hasAttribute('poster')) { |
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$entry->setAttribute('poster', $src); |
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} else { |
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$entry->setAttribute('src', $src); |
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$entry->removeAttribute("srcset"); |
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} |
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$need_saving = true; |
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} |
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} |
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} |
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if ($need_saving) { |
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$doc->removeChild($doc->firstChild); //remove doctype |
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$res = $doc->saveHTML(); |
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} |
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} |
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return $res; |
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} |
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public static function expire() { |
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$dirs = array_filter(glob(CACHE_DIR."/*"), "is_dir"); |
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136
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137
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foreach ($dirs as $cache_dir) { |
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$num_deleted = 0; |
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if (is_writable($cache_dir) && !file_exists("$cache_dir/.no-auto-expiry")) { |
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$files = glob("$cache_dir/*"); |
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if ($files) { |
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foreach ($files as $file) { |
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if (time() - filemtime($file) > 86400 * CACHE_MAX_DAYS) { |
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unlink($file); |
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++$num_deleted; |
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} |
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} |
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} |
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Debug::log("expired $cache_dir: removed $num_deleted files."); |
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} |
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} |
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156
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} |
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157
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} |
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codysnider /
tt-rss
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