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<?php namespace Illuminate\Http\Middleware; use Closure; use Illuminate\Support\Carbon; use Illuminate\Support\Collection; 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 (new Collection($options)) ->map(function ($value, $key) { if (is_bool($value)) { return $value ? $key : null; } return is_int($key) ? $value : "{$key}={$value}"; }) ->filter() ->map(fn ($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 (! $response->isSuccessful()) { return $response; } if (isset($options['etag']) && $options['etag'] === true) { $options['etag'] = $response->getEtag() ?? ($response->getContent() ? md5($response->getContent()) : null); } if (isset($options['last_modified'])) { if (is_numeric($options['last_modified'])) { $options['last_modified'] = Carbon::createFromTimestamp($options['last_modified'], date_default_timezone_get()); } 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 (new Collection(explode(';', rtrim($options, ';'))))->mapWithKeys(function ($option) { $data = explode('=', $option, 2); return [$data[0] => $data[1] ?? true]; })->all(); } }
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