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File / Folder	Size	Action
.	-
AddLinkHeadersForPreloa...	0.729KB	edt ren
CheckResponseForModific...	0.526KB	edt ren
FrameGuard.php	0.487KB	edt ren
HandleCors.php	2.69KB	edt ren
SetCacheHeaders.php	2.447KB	edt ren
TrustHosts.php	1.66KB	edt ren
TrustProxies.php	3.735KB	edt ren

<?php

namespace Illuminate\Http\Middleware;

use Closure;
use Illuminate\Support\Carbon;
use Illuminate\Support\Str;
use Symfony\Component\HttpFoundation\BinaryFileResponse;
use Symfony\Component\HttpFoundation\StreamedResponse;

class SetCacheHeaders
{
    /**
     * Specify the options for the middleware.
     *
     * @param  array|string  $options
     * @return string
     */
    public static function using($options)
    {
        if (is_string($options)) {
            return static::class.':'.$options;
        }

return collect($options)
            ->map(fn ($value, $key) => is_int($key) ? $value : "{$key}={$value}")
            ->map(fn ($value) => Str::finish($value, ';'))
            ->pipe(fn ($options) => rtrim(static::class.':'.$options->implode(''), ';'));
    }

/**
     * 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 && ! $response instanceof StreamedResponse)) {
            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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