/**
* Gets the path for the request assets and handles caching/etag responses
* Automatically sends a 404 and exits if path doesn't exist or fails a security check
*
* @param string $contentType
* @param Asset $asset Asset to compile. If null, path contents will be ouputed
* @param int $lastModified If null, filemtime will be used, should return a unix timestamp
*/
private function process($contentType, Asset $asset = null, $lastModified = null)
{
if ($lastModified === null) {
$lastModified = filemtime($this->path);
}
$etag = '"' . sha1($this->path . $lastModified) . '"';
if (isset($_SERVER['HTTP_IF_NONE_MATCH'])) {
if ($_SERVER['HTTP_IF_NONE_MATCH'] === $etag) {
header('HTTP/1.1 304 Not Modified');
exit;
}
}
$dateFormat = 'D, d M Y H:i:s T';
header('Cache-Control: public, max-age=31536000');
header('Expires: ' . gmdate($dateFormat, $lastModified + 31536000));
header('Last-Modified: ' . gmdate($dateFormat, $lastModified));
header('ETag: ' . $etag);
header('Content-Type: ' . $contentType . '; charset=utf-8');
$compile = function () use($asset) {
if ($asset === null) {
return file_get_contents($this->path);
} else {
header('X-Cached: false');
try {
return $asset->compile();
} catch (CompilationException $e) {
if (is_array($e->context)) {
foreach ($e->context as $key => $value) {
printf('/* %s: %s */%s', strtoupper($key), $value, PHP_EOL);
}
} else {
if (is_string($e->context)) {
printf('/* %s */%s', $e->context, PHP_EOL);
}
}
echo $e->log;
exit(1);
}
}
};
if (isset($_GET['ignore-cache'])) {
echo $compile();
} else {
echo app('cache')->remember(str_slug($this->path) . '-' . md5($lastModified), 1440, $compile);
}
exit;
}
