1: <?php
 2: /**
 3:  * CakePHP(tm) : Rapid Development Framework (https://cakephp.org)
 4:  * Copyright (c) Cake Software Foundation, Inc. (https://cakefoundation.org)
 5:  *
 6:  * Licensed under The MIT License
 7:  * Redistributions of files must retain the above copyright notice.
 8:  *
 9:  * @copyright     Copyright (c) Cake Software Foundation, Inc. (https://cakefoundation.org)
10:  * @link          https://cakephp.org CakePHP(tm) Project
11:  * @since         3.3.0
12:  * @license       https://opensource.org/licenses/mit-license.php MIT License
13:  */
14: namespace Cake\I18n\Middleware;
15: 
16: use Cake\I18n\I18n;
17: use Locale;
18: use Psr\Http\Message\ResponseInterface;
19: use Psr\Http\Message\ServerRequestInterface;
20: 
21: /**
22:  * Sets the runtime default locale for the request based on the
23:  * Accept-Language header. The default will only be set if it
24:  * matches the list of passed valid locales.
25:  */
26: class LocaleSelectorMiddleware
27: {
28:     /**
29:      * List of valid locales for the request
30:      *
31:      * @var array
32:      */
33:     protected $locales = [];
34: 
35:     /**
36:      * Constructor.
37:      *
38:      * @param array $locales A list of accepted locales, or ['*'] to accept any
39:      *   locale header value.
40:      */
41:     public function __construct(array $locales = [])
42:     {
43:         $this->locales = $locales;
44:     }
45: 
46:     /**
47:      * @param ServerRequestInterface $request The request.
48:      * @param ResponseInterface $response The response.
49:      * @param callable $next The next middleware to call.
50:      * @return \Psr\Http\Message\ResponseInterface A response.
51:      */
52:     public function __invoke(ServerRequestInterface $request, ResponseInterface $response, $next)
53:     {
54:         $locale = Locale::acceptFromHttp($request->getHeaderLine('Accept-Language'));
55:         if (!$locale) {
56:             return $next($request, $response);
57:         }
58:         if ($this->locales !== ['*']) {
59:             $locale = Locale::lookup($this->locales, $locale, true);
60:         }
61:         if ($locale || $this->locales === ['*']) {
62:             I18n::setLocale($locale);
63:         }
64: 
65:         return $next($request, $response);
66:     }
67: }
68: