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<?php |
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namespace Psr7Middlewares\Middleware; |
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use Psr7Middlewares\Middleware; |
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use Psr7Middlewares\Utils; |
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use Negotiation\LanguageNegotiator as Negotiator; |
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use Psr\Http\Message\ServerRequestInterface; |
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use Psr\Http\Message\ResponseInterface; |
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/** |
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* Middleware returns the client preferred language. |
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*/ |
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class LanguageNegotiator |
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{ |
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use Utils\NegotiateTrait; |
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const KEY = 'LANGUAGE'; |
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/** |
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* @var array Allowed languages |
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*/ |
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private $languages = []; |
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/** |
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* Returns the language. |
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* |
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* @param ServerRequestInterface $request |
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* |
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* @return string|null |
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*/ |
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public static function getLanguage(ServerRequestInterface $request) |
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{ |
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return Middleware::getAttribute($request, self::KEY); |
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} |
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/** |
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* Constructor. Defines de available languages. |
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* |
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* @param array $languages |
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*/ |
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public function __construct(array $languages = null) |
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{ |
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if ($languages !== null) { |
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$this->languages($languages); |
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} |
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} |
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/** |
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* Configure the available languages. |
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* |
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* @param array $languages |
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* |
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* @return self |
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*/ |
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public function languages(array $languages) |
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{ |
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$this->languages = $languages; |
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return $this; |
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} |
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/** |
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* Execute the middleware. |
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* |
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* @param ServerRequestInterface $request |
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* @param ResponseInterface $response |
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* @param callable $next |
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* |
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* @return ResponseInterface |
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*/ |
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public function __invoke(ServerRequestInterface $request, ResponseInterface $response, callable $next) |
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{ |
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$language = $this->negotiateHeader($request->getHeaderLine('Accept-Language'), new Negotiator(), $this->languages); |
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if (empty($language)) { |
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$language = isset($this->languages[0]) ? $this->languages[0] : null; |
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} |
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$request = Middleware::setAttribute($request, self::KEY, $language); |
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return $next($request, $response); |
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} |
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} |
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oscarotero /
psr7-middlewares
