Yiisoft\Yii\Middleware\Locale

Complexity

Total Complexity

54

Size/Duplication

Total Lines	317
Duplicated Lines	0 %

Test Coverage

Coverage

100%

Importance

Changes	3
Bugs	0	Features	0

20 Methods

Rating	Name	Duplication	Size	Complexity
A	isRequestIgnored()	0	8	3
A	assertLocalesFormat()	0	5	4
A	saveLocale()	0	9	2
A	__construct()	0	11	1
A	getLocaleFromRequest()	0	17	3
A	parseLocale()	0	9	3
A	detectLocale()	0	11	4
C	process()	0	50	13
A	getBaseUrl()	0	3	1
A	applyLocaleFromPath()	0	20	5
A	getLocaleFromPath()	0	24	5
A	isDefaultLocale()	0	3	2
A	withDetectLocale()	0	5	1
A	withSupportedLocales()	0	5	1
A	withQueryParameterName()	0	5	1
A	withDefaultLocale()	0	5	1
A	withSaveLocale()	0	5	1
A	withIgnoredRequestUrlPatterns()	0	5	1
A	withSessionName()	0	5	1
A	withSecureCookie()	0	5	1

<?php

declare(strict_types=1);

namespace Yiisoft\Yii\Middleware;

use DateInterval;
use Psr\Http\Message\ResponseFactoryInterface;
use Psr\Http\Message\ResponseInterface;
use Psr\Http\Message\ServerRequestInterface;
use Psr\Http\Server\MiddlewareInterface;
use Psr\Http\Server\RequestHandlerInterface;
use Psr\Log\LoggerInterface;
use Yiisoft\Cookies\Cookie;
use Yiisoft\Http\Header;
use Yiisoft\Http\Method;
use Yiisoft\Http\Status;
use Yiisoft\Router\UrlGeneratorInterface;
use Yiisoft\Session\SessionInterface;
use Yiisoft\Strings\WildcardPattern;
use Yiisoft\Translator\TranslatorInterface;
use Yiisoft\Yii\Middleware\Exception\InvalidLocalesFormatException;

/**
 * Locale middleware supports locale-based routing and configures translator and URL generator.
 * You should place it before `Route` middleware in the middleware list.
 */
final class Locale implements MiddlewareInterface
{
    private const DEFAULT_LOCALE = 'en';
    private const DEFAULT_LOCALE_NAME = '_language';

    private bool $saveLocale = true;
    private bool $detectLocale = false;
    private string $defaultLocale = self::DEFAULT_LOCALE;
    private string $queryParameterName = self::DEFAULT_LOCALE_NAME;
    private string $sessionName = self::DEFAULT_LOCALE_NAME;
    private ?DateInterval $cookieDuration;

    /**
     * @param TranslatorInterface $translator Translator instance to set locale for.
     * @param UrlGeneratorInterface $urlGenerator URL generator instance to set locale for.
     * @param SessionInterface $session Session instance to save locale to.
     * @param LoggerInterface $logger Logger instance to write debug logs to.
     * @param ResponseFactoryInterface $responseFactory Response factory used to create redirect responses.
     * @param array $supportedLocales List of supported locales in key-value format such as `['ru' => 'ru_RU', 'uz' => 'uz_UZ']`.
     * @param string[] $ignoredRequestUrlPatterns {@see WildcardPattern Patterns} for ignoring requests with URLs matching.
     * @param bool $secureCookie Whether middleware should flag locale cookie as "secure."
     */
    public function __construct(
        private TranslatorInterface $translator,
        private UrlGeneratorInterface $urlGenerator,
        private SessionInterface $session,
        private LoggerInterface $logger,
        private ResponseFactoryInterface $responseFactory,
        private array $supportedLocales = [],
        private array $ignoredRequestUrlPatterns = [],
        private bool $secureCookie = false,
    ) {
        $this->cookieDuration = new DateInterval('P30D');
    }

    public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface
    {
        if ($this->supportedLocales === []) {
            return $handler->handle($request);
        }

        $this->assertLocalesFormat();

        $uri = $request->getUri();
        $path = $uri->getPath();
        $query = $uri->getQuery();

        $locale = $this->getLocaleFromPath($path);

        if ($locale !== null) {
            $this->translator->setLocale($this->supportedLocales[$locale]);
            $this->urlGenerator->setDefaultArgument($this->queryParameterName, $locale);

            $response = $handler->handle($request);
            $newPath = null;
            if ($this->isDefaultLocale($locale) && $request->getMethod() === Method::GET) {
                $length = strlen($locale);
                $newPath = substr($path, $length + 1);
            }
            return $this->applyLocaleFromPath($locale, $response, $query, $newPath);
        }
        if ($this->saveLocale) {
            $locale = $this->getLocaleFromRequest($request);
        }
        if ($locale === null && $this->detectLocale) {
            $locale = $this->detectLocale($request);
        }
        if ($locale === null || $this->isDefaultLocale($locale) || $this->isRequestIgnored($request)) {
            $this->urlGenerator->setDefaultArgument($this->queryParameterName, null);
            $request = $request->withUri($uri->withPath('/' . $this->defaultLocale . $path));
            return $handler->handle($request);
        }

        $this->translator->setLocale($this->supportedLocales[$locale]);
        $this->urlGenerator->setDefaultArgument($this->queryParameterName, $locale);

        if ($request->getMethod() === Method::GET) {
            $location = $this->getBaseUrl() . '/' . $locale . $path . ($query !== '' ? '?' . $query : '');
            return $this->responseFactory
                ->createResponse(Status::FOUND)
                ->withHeader(Header::LOCATION, $location);
        }


        return $handler->handle($request);
    }

    private function applyLocaleFromPath(
        string $locale,
        ResponseInterface $response,
        string $query,
        ?string $newPath = null,
    ): ResponseInterface {
        if ($newPath === '') {
            $newPath = '/';
        }

        if ($newPath !== null) {
            $location = $this->getBaseUrl() . $newPath . ($query !== '' ? '?' . $query : '');
            $response = $this->responseFactory
                ->createResponse(Status::FOUND)
                ->withHeader(Header::LOCATION, $location);
        }
        if ($this->saveLocale) {
            $response = $this->saveLocale($locale, $response);
        }
        return $response;
    }

    private function getLocaleFromPath(string $path): ?string
    {
        $parts = [];
        /**
         * @var string $code
         * @var string $locale
         */
        foreach ($this->supportedLocales as $code => $locale) {
            $parts[] = $code;
            $parts[] = $locale;
        }

        $pattern = implode('|', $parts);
        if (preg_match("#^/($pattern)\b(/?)#i", $path, $matches)) {
            $matchedLocale = $matches[1];
            if (!isset($this->supportedLocales[$matchedLocale])) {
                $matchedLocale = $this->parseLocale($matchedLocale);
            }
            if (isset($this->supportedLocales[$matchedLocale])) {
                $this->logger->debug(sprintf("Locale '%s' found in URL", $matchedLocale));
                return $matchedLocale;
            }
        }
        return null;
    }

    private function getLocaleFromRequest(ServerRequestInterface $request): ?string
    {
        /** @var array<string, string> $cookies */
        $cookies = $request->getCookieParams();
        if (isset($cookies[$this->sessionName])) {
            $this->logger->debug(sprintf("Locale '%s' found in cookies", $cookies[$this->sessionName]));
            return $this->parseLocale($cookies[$this->sessionName]);
        }
        /** @var array<string, string> $queryParameters */
        $queryParameters = $request->getQueryParams();
        if (isset($queryParameters[$this->queryParameterName])) {
            $this->logger->debug(
                sprintf("Locale '%s' found in query string", $queryParameters[$this->queryParameterName])
            );
            return $this->parseLocale($queryParameters[$this->queryParameterName]);
        }
        return null;
    }

    private function isDefaultLocale(string $locale): bool
    {
        return $locale === $this->defaultLocale || $this->supportedLocales[$locale] === $this->defaultLocale;
    }

    private function detectLocale(ServerRequestInterface $request): ?string
    {
        foreach ($request->getHeader(Header::ACCEPT_LANGUAGE) as $language) {
            if (!isset($this->supportedLocales[$language])) {
                $language = $this->parseLocale($language);
            }
            if (isset($this->supportedLocales[$language])) {
                return $language;
            }
        }
        return null;
    }

    private function saveLocale(string $locale, ResponseInterface $response): ResponseInterface
    {
        $this->logger->debug('Saving found locale to session and cookies.');
        $this->session->set($this->sessionName, $locale);
        $cookie = new Cookie(name: $this->sessionName, value: $locale, secure: $this->secureCookie);
        if ($this->cookieDuration !== null) {
            $cookie = $cookie->withMaxAge($this->cookieDuration);
        }
        return $cookie->addToResponse($response);
    }

    private function parseLocale(string $locale): string
    {
        if (str_contains($locale, '-')) {
            [$locale] = explode('-', $locale, 2);
        } elseif (str_contains($locale, '_')) {
            [$locale] = explode('_', $locale, 2);
        }

        return $locale;
    }

    private function isRequestIgnored(ServerRequestInterface $request): bool
    {
        foreach ($this->ignoredRequestUrlPatterns as $ignoredRequest) {
            if ((new WildcardPattern($ignoredRequest))->match($request->getUri()->getPath())) {
                return true;
            }
        }
        return false;
    }

    /**
     * @psalm-assert array<string, string> $this->supportedLocales
     *
     * @throws InvalidLocalesFormatException
     */
    private function assertLocalesFormat(): void
    {
        foreach ($this->supportedLocales as $code => $locale) {
            if (!is_string($code) || !is_string($locale)) {
                throw new InvalidLocalesFormatException();
            }
        }
    }

    private function getBaseUrl(): string
    {
        return rtrim($this->urlGenerator->getUriPrefix(), '/');
    }

    /**
     * Return new instance with supported locales specified.
     *
     * @param array $locales List of supported locales in key-value format such as `['ru' => 'ru_RU', 'uz' => 'uz_UZ']`.
     */
    public function withSupportedLocales(array $locales): self
    {
        $new = clone $this;
        $new->supportedLocales = $locales;
        return $new;
    }

    /**
     * Return new instance with default locale specified.
     *
     * @param string $defaultLocale Default locale.
     */
    public function withDefaultLocale(string $defaultLocale): self
    {
        $new = clone $this;
        $new->defaultLocale = $defaultLocale;
        return $new;
    }

    /**
     * Return new instance with the name of the query string parameter to look for locale.
     *
     * @param string $queryParameterName Name of the query string parameter.
     */
    public function withQueryParameterName(string $queryParameterName): self
    {
        $new = clone $this;
        $new->queryParameterName = $queryParameterName;
        return $new;
    }

    /**
     * Return new instance with the name of session parameter to store found locale.
     *
     * @param string $sessionName Name of session parameter.
     */
    public function withSessionName(string $sessionName): self
    {
        $new = clone $this;
        $new->sessionName = $sessionName;
        return $new;
    }

    /**
     * Return new instance with enabled or disabled saving of locale.
     *
     * @param bool $enabled Whether middleware should save locale into session and cookies.
     */
    public function withSaveLocale(bool $enabled): self
    {
        $new = clone $this;
        $new->saveLocale = $enabled;
        return $new;
    }

    /**
     * Return new instance with enabled or disabled detection of locale based on `Accept-Language` header.
     *
     * @param bool $enabled Whether middleware should detect locale.
     */
    public function withDetectLocale(bool $enabled): self
    {
        $new = clone $this;
        $new->detectLocale = $enabled;
        return $new;
    }

    /**
     * Return new instance with {@see WildcardPattern patterns} for ignoring requests with URLs matching.
     *
     * @param string[] $patterns Patterns.
     */
    public function withIgnoredRequestUrlPatterns(array $patterns): self
    {
        $new = clone $this;
        $new->ignoredRequestUrlPatterns = $patterns;
        return $new;
    }

    /**
     * Return new instance with enabled or disabled secure cookies.
     *
     * @param bool $secure Whether middleware should flag locale cookie as "secure."
     */
    public function withSecureCookie(bool $secure): self
    {
        $new = clone $this;
        $new->secureCookie = $secure;
        return $new;
    }
}