/**
* Checks to see if cache exists and is the latest, if it does, return it
*
* Extra security checks for images
*
* @param string $originalFile
* @param string $cacheFile
*
* @return bool|string
*/
protected function checkCache($originalFile, $cacheFile)
{
if (!($return = parent::checkCache($originalFile, $cacheFile))) {
/**
* If using the placeholder when the original file doesn't exist
* and it has already been cached, return the cached contents.
* Also make sure the placeholder hasn't been modified since being cached.
*/
$this->placeholder = $this->parsePlaceholders($originalFile);
if (!file_exists($originalFile) && $this->placeholder) {
return parent::checkCache($this->placeholder, $cacheFile);
}
}
return $return;
}
/**
* Checks to see if cache exists and is the latest, if it does, return it
* It also checks to see if this is LESS cache and makes sure all imported files are the latest
*
* @param string $originalFile
* @param string $cacheFile
*
* @return bool|string|array
*/
protected function checkCache($originalFile, $cacheFile)
{
if (!($ret = parent::checkCache($originalFile, $cacheFile))) {
return false;
}
if (Utils::isSerialized($ret, $ret)) {
// Go through each file and make sure none of them have changed
foreach ($ret['files'] as $file => $lastModified) {
if (filemtime($file) > $lastModified) {
return false;
}
}
$ret = serialize($ret);
}
return $ret;
}
