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<?php |
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/** |
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* WebHemi. |
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* |
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* PHP version 5.6 |
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* |
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* @copyright 2012 - 2016 Gixx-web (http://www.gixx-web.com) |
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* @license https://opensource.org/licenses/MIT The MIT License (MIT) |
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* |
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* @link http://www.gixx-web.com |
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*/ |
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namespace WebHemi\Application\Web; |
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use Psr\Http\Message\ResponseInterface; |
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use Psr\Http\Message\ServerRequestInterface; |
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use WebHemi\Adapter\DependencyInjection\DependencyInjectionAdapterInterface; |
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use WebHemi\Adapter\Http\HttpAdapterInterface; |
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use WebHemi\Adapter\Renderer\RendererAdapterInterface; |
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use WebHemi\Adapter\Router\RouterAdapterInterface; |
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use WebHemi\Application\ApplicationInterface; |
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use WebHemi\Application\EnvironmentManager; |
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use WebHemi\Middleware\DispatcherMiddleware; |
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use WebHemi\Middleware\FinalMiddleware; |
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use WebHemi\Middleware\MiddlewareInterface; |
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use WebHemi\Middleware\Pipeline\MiddlewarePipelineInterface; |
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/** |
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* Class WebApplication. |
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*/ |
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class WebApplication implements ApplicationInterface |
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{ |
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/** @var DependencyInjectionAdapterInterface */ |
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private $container; |
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/** @var EnvironmentManager */ |
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private $environmentManager; |
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/** @var MiddlewarePipelineInterface */ |
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private $pipeline; |
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/** |
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* ApplicationInterface constructor. |
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* |
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* @param DependencyInjectionAdapterInterface $container |
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* @param EnvironmentManager $environmentManager |
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* @param MiddlewarePipelineInterface $pipeline |
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*/ |
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public function __construct( |
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DependencyInjectionAdapterInterface $container, |
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EnvironmentManager $environmentManager, |
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MiddlewarePipelineInterface $pipeline |
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) { |
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$this->container = $container; |
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$this->environmentManager = $environmentManager; |
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$this->pipeline = $pipeline; |
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} |
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/** |
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* Returns the DI Adapter instance. |
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* |
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* @return DependencyInjectionAdapterInterface |
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*/ |
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public function getContainer() |
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{ |
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return $this->container; |
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} |
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/** |
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* Get ready to run the application: set final data for specific services. |
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*/ |
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private function prepare() |
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{ |
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$this->container |
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->setServiceArgument(HttpAdapterInterface::class, $this->environmentManager->getEnvironmentData('GET')) |
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->setServiceArgument(HttpAdapterInterface::class, $this->environmentManager->getEnvironmentData('POST')) |
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->setServiceArgument(HttpAdapterInterface::class, $this->environmentManager->getEnvironmentData('SERVER')) |
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->setServiceArgument(HttpAdapterInterface::class, $this->environmentManager->getEnvironmentData('COOKIE')) |
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->setServiceArgument(HttpAdapterInterface::class, $this->environmentManager->getEnvironmentData('FILES')); |
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$this->container |
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->setServiceArgument( |
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RendererAdapterInterface::class, |
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$this->environmentManager->getApplicationTemplateSettings() |
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) |
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->setServiceArgument( |
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RendererAdapterInterface::class, |
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$this->environmentManager->getResourcePath() |
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); |
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$this->container |
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->setServiceArgument( |
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RouterAdapterInterface::class, |
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$this->environmentManager->getModuleRouteSettings() |
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) |
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->setServiceArgument( |
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RouterAdapterInterface::class, |
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$this->environmentManager->getSelectedApplicationUri() |
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); |
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} |
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/** |
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* Runs the application. This is where the magic happens. |
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* According tho the environment settings this must build up the middleware pipeline and execute it. |
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* |
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* a Pre-Routing Middleware can be; priority < 0: |
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* - LockCheck - check if the client IP is banned > S102|S403 |
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* - Auth - if the user is not logged in, but there's a "Remember me" cookie, then logs in > S102 |
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* |
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* Routing Middleware is fixed (RoutingMiddleware::class); priority = 0: |
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* - A middleware that routes the incoming Request and delegates to the matched middleware. > S102|S404|S405 |
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* The RouteResult should be attached to the Request. |
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* If the Routing is not defined explicitly in the pipeline, then it will be injected with priority 0. |
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* |
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* a Post-Routing Middleware can be; priority between 0 and 100: |
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* - Acl - checks if the given route is available for the client. Also checks the auth > S102|S401|S403 |
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* - CacheReader - checks if a suitable response body is cached. > S102|S200 |
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* |
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* Dispatcher Middleware is fixed (DispatcherMiddleware::class); priority = 100: |
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* - A middleware which gets the corresponding Action middleware and applies it > S102 |
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* If the Dispatcher is not defined explicitly in the pipeline, then it will be injected with priority 100. |
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* The Dispatcher should not set the response Status Code to 200 to let Post-Dispatchers to be called. |
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* |
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* a Post-Dispatch Middleware can be; priority > 100: |
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* - CacheWriter - writes response body into DataStorage (DB, File etc.) > S102 |
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* |
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* Final Middleware is fixed (FinalMiddleware:class): |
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* - This middleware behaves a bit differently. It cannot be ordered, it's always the last called middleware: |
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* - when the middleware pipeline reached its end (typically when the Status Code is still 102) |
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* - when one item of the middleware pipeline returns with return response (status code is set to 200|40*|500) |
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* - when during the pipeline process an Exception is thrown. |
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* |
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* When the middleware pipeline is finished the application prints the header and the output. |
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* |
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* If a middleware other than the Routing, Dispatcher and Final Middleware has no priority set, it will be |
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* considered to have priority = 50. |
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* |
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* @return void |
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*/ |
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public function run() |
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{ |
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$this->prepare(); |
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/** @var HttpAdapterInterface $httpAdapter */ |
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$httpAdapter = $this->getContainer()->get(HttpAdapterInterface::class); |
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/** @var ServerRequestInterface $request */ |
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$request = $httpAdapter->getRequest(); |
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/** @var ResponseInterface $response */ |
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$response = $httpAdapter->getResponse(); |
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$middlewareClass = $this->pipeline->start(); |
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while ($middlewareClass !== null) { |
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try { |
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/** @var MiddlewareInterface $middleware */ |
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$middleware = $this->container->get($middlewareClass); |
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$requestAttributes = $request->getAttributes(); |
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// As an extra step if the action middleware is resolved, it is invoked right before the dispatcher. |
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if ($middleware instanceof DispatcherMiddleware |
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&& isset($requestAttributes['resolvedActionMiddleware']) |
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) { |
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/** @var MiddlewareInterface $actionMiddleware */ |
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$actionMiddleware = $this->container->get($requestAttributes['resolvedActionMiddleware']); |
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$response = $actionMiddleware($request, $response); |
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} |
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$response = $middleware($request, $response); |
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} catch (\Exception $exception) { |
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$response = $response->withStatus(500); |
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$request = $request->withAttribute('exception', $exception); |
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} |
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if ($response->getStatusCode() != 102) { |
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break; |
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} |
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$middlewareClass = $this->pipeline->next(); |
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}; |
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// If there was no error, we mark as ready for output. |
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if ($response->getStatusCode() == 102) { |
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$response = $response->withStatus(200); |
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} |
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/** @var FinalMiddleware $finalMiddleware */ |
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$finalMiddleware = $this->container->get(FinalMiddleware::class); |
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// Send out headers and content. |
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$finalMiddleware($request, $response); |
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} |
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} |
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