contenttype.php

<?php
namespace Bitrix\Main\Engine\ActionFilter;
 
use Bitrix\Main\Engine;
use Bitrix\Main\Error;
use Bitrix\Main\Event;
use Bitrix\Main\EventResult;
 
final class ContentType extends Base
{
    const JSON  = 'application/json';
    const ERROR_INVALID_CONTENT_TYPE = 'invalid_content_type';
 
    private $allowedTypes;
 
    public function __construct(array $allowedTypes = [])
    {
        $this->allowedTypes = $allowedTypes;
        parent::__construct();
    }
 
    public function onBeforeAction(Event $event)
    {
        $contentType = $this->getRequestContentType();
        if (!in_array($contentType, $this->allowedTypes, true))
        {
            $this->addError(new Error(
                "Wrong content type for current action. `"
                . implode('`, `', $this->allowedTypes)
                . "` expected, `{$contentType}` got.",
                self::ERROR_INVALID_CONTENT_TYPE
            ));
 
            return new EventResult(EventResult::ERROR, null, null, $this);
        }
 
        switch ($this->getRequestContentType())
        {
            case self::JSON:
                $jsonPayload = new Engine\JsonPayload();
                $this->setActionSourceParametersToMap($jsonPayload);
                break;
        }
 
        return null;
    }
 
    protected function setActionSourceParametersToMap(Engine\JsonPayload $payload)
    {
        $payload = $payload->getData();
        if (!is_array($payload))
        {
            return;
        }
 
        $parameters = [];
        foreach ($payload as $key => $value)
        {
            if ($key && !is_numeric($key))
            {
                $parameters[$key] = $value;
            }
        }
 
        if (!$parameters)
        {
            return;
        }
 
        $controller = $this->getAction()->getController();
        $controller->setSourceParametersList(array_merge(
            $controller->getSourceParametersList(),
            [$parameters]
        ));
    }
 
    protected function getRequestContentType()
    {
        return $this->getAction()->getController()->getRequest()->getHeaders()->getContentType();
    }
}