Creating an application #6 - application

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Application

The Yii HTTP Application provides the Application::class, as well as the events and handlers needed to interact with HTTP. The package is implemented using PSR-7 and PSR-15 standards.

The following example shows how to create configuration for the App template, using Yii HTTP Application package:

<?php

declare(strict_types=1);

use App\Handler\NotFoundHandler;
use Yiisoft\Definitions\DynamicReference;
use Yiisoft\Definitions\Reference;
use Yiisoft\Injector\Injector;
use Yiisoft\Middleware\Dispatcher\MiddlewareDispatcher;

/** @var array $params */

return [
    \Yiisoft\Yii\Http\Application::class => [
        '__construct()' => [
            'dispatcher' => DynamicReference::to(
                static function (Injector $injector) use ($params) {
                    return ($injector->make(MiddlewareDispatcher::class))->withMiddlewares($params['middlewares']);
                },
            ),
            'fallbackHandler' => Reference::to(NotFoundHandler::class),
        ],
    ],

    \Yiisoft\Yii\Middleware\Locale::class => [
        '__construct()' => [
            'locales' => $params['locale']['locales'],
            'ignoredRequests' => $params['locale']['ignoredRequests'],
        ],
        'withEnableSaveLocale()' => [false],
    ],
];

The Application class is a PSR-15 middleware. It is used to dispatch the middleware stack and handle the request. The Application class is configured with a dispatcher and a fallbackHandler. The dispatcher is a PSR-15 middleware that dispatches the middleware stack. The fallbackHandler represents the handler that will be called if no other handler is found.

The Locale class is a PSR-15 middleware that sets the locale based on the request. It is configured with a list of supported locales and a list of ignored requests. The Locale middleware is used to set the locale for the request. It is configured with a list of supported locales and a list of ignored requests.

The application is configured section of the params configuration file:

<?php

declare(strict_types=1);

use Yiisoft\ErrorHandler\Middleware\ErrorCatcher;
use Yiisoft\Router\Middleware\Router;
use Yiisoft\Session\SessionMiddleware;

return [
    // Internationalization (i18n)
    'locale' => [
        'locales' => ['en' => 'en-US', 'ru' => 'ru-RU'],
        'ignoredRequests' => [
            '/debug**',
        ],
    ],

    // Middlewares stack
    'middlewares' => [
        ErrorCatcher::class,
        SessionMiddleware::class,
        \Yiisoft\Yii\Middleware\Locale::class,
        Router::class,
    ],
];
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