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<?php
namespace Illuminate\Http\Middleware;
use Closure;
use Illuminate\Support\Carbon;
use Symfony\Component\HttpFoundation\BinaryFileResponse;
class SetCacheHeaders
{
/**
* Add cache related HTTP headers.
*
* @param \Illuminate\Http\Request $request
* @param \Closure $next
* @param string|array $options
* @return \Symfony\Component\HttpFoundation\Response
*
* @throws \InvalidArgumentException
*/
public function handle($request, Closure $next, $options = [])
{
$response = $next($request);
if (! $request->isMethodCacheable() || (! $response->getContent() && ! $response instanceof BinaryFileResponse)) {
return $response;
}
if (is_string($options)) {
$options = $this->parseOptions($options);
}
if (isset($options['etag']) && $options['etag'] === true) {
$options['etag'] = $response->getEtag() ?? md5($response->getContent());
}
if (isset($options['last_modified'])) {
if (is_numeric($options['last_modified'])) {
$options['last_modified'] = Carbon::createFromTimestamp($options['last_modified']);
} else {
$options['last_modified'] = Carbon::parse($options['last_modified']);
}
}
$response->setCache($options);
$response->isNotModified($request);
return $response;
}
/**
* Parse the given header options.
*
* @param string $options
* @return array
*/
protected function parseOptions($options)
{
return collect(explode(';', rtrim($options, ';')))->mapWithKeys(function ($option) {
$data = explode('=', $option, 2);
return [$data[0] => $data[1] ?? true];
})->all();
}
}
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