150 lines
3.5 KiB
PHP
150 lines
3.5 KiB
PHP
<?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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$this->dir = CACHE_DIR . "/" . basename($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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} 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($filename));
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else
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return -1;
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}
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public function getFullPath($filename) {
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$filename = basename($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($filename));
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else
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return null;
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}
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public function getMimeType($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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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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static public function getUrl($filename) {
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return get_self_url_prefix() . "/public.php?op=cached_url&file=" . $filename;
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}
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// check for locally cached (media) URLs and rewrite to local versions
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// this is called separately after sanitize() and plugin render article hooks to allow
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// plugins work on original source URLs used before caching
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static public function rewriteUrls($str)
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{
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$res = trim($str);
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if (!$res) return '';
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$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->getSize($cached_filename) > 0) {
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$src = DiskCache::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', $src);
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$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 $res;
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}
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static function expire() {
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$dirs = array_filter(glob(CACHE_DIR . "/*"), "is_dir");
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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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}
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}
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