HttpMethodValidator.php

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<?php
declare(strict_types=1);

namespace Magento\Framework\App\Request;

use Magento\Framework\App\ActionInterface;
use Magento\Framework\App\RequestInterface;
use Magento\Framework\Exception\NotFoundException;
use Magento\Framework\Interception\InterceptorInterface;
use Magento\Framework\Phrase;
use Psr\Log\LoggerInterface;

class HttpMethodValidator implements ValidatorInterface
{
    private $map;

    private $log;

    public function __construct(
        HttpMethodMap $map,
        LoggerInterface $logger
    ) {
        $this->map = $map;
        $this->log = $logger;
    }

    private function throwException(
        Http $request,
        ActionInterface $action
    ): void {
        $uri = $request->getRequestUri();
        $method = $request->getMethod();
        if ($action instanceof InterceptorInterface) {
            $actionClass = get_parent_class($action);
        } else {
            $actionClass = get_class($action);
        }
        $this->log->debug(
            "URI '$uri'' cannot be accessed with $method method ($actionClass)"
        );

        throw new InvalidRequestException(
            new NotFoundException(new Phrase('Page not found.'))
        );
    }

    public function validate(
        RequestInterface $request,
        ActionInterface $action
    ): void {
        if ($request instanceof Http) {
            $method = $request->getMethod();
            $map = $this->map->getMap();
            //If we don't have an interface for the HTTP method or
            //the action has HTTP method limitations and doesn't allow the
            //received one then the request is invalid.
            if (!array_key_exists($method, $map)
                || (array_intersect($map, class_implements($action, true))
                    && !$action instanceof $map[$method]
                )
            ) {
                $this->throwException($request, $action);
            }
        }
    }
}