Json.php

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<?php
namespace Magento\Framework\Webapi\Rest\Request\Deserializer;

use Magento\Framework\App\State;
use Magento\Framework\Phrase;

class Json implements \Magento\Framework\Webapi\Rest\Request\DeserializerInterface
{
    protected $decoder;

    protected $_appState;

    private $serializer;

    public function __construct(
        \Magento\Framework\Json\Decoder $decoder,
        State $appState,
        \Magento\Framework\Serialize\Serializer\Json $serializer = null
    ) {
        $this->decoder = $decoder;
        $this->_appState = $appState;
        $this->serializer = $serializer ?: \Magento\Framework\App\ObjectManager::getInstance()
            ->get(\Magento\Framework\Serialize\Serializer\Json::class);
    }

    public function deserialize($encodedBody)
    {
        if (!is_string($encodedBody)) {
            throw new \InvalidArgumentException(
                sprintf('"%s" data type is invalid. String is expected.', gettype($encodedBody))
            );
        }
        try {
            $decodedBody = $this->serializer->unserialize($encodedBody);
        } catch (\InvalidArgumentException $e) {
            if ($this->_appState->getMode() !== State::MODE_DEVELOPER) {
                throw new \Magento\Framework\Webapi\Exception(new Phrase('Decoding error.'));
            } else {
                throw new \Magento\Framework\Webapi\Exception(
                    new Phrase(
                        'Decoding error: %1%2%3%4',
                        [PHP_EOL, $e->getMessage(), PHP_EOL, $e->getTraceAsString()]
                    )
                );
            }
        }
        return $decodedBody;
    }
}