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