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Editing: HttpTransporter.php

<?php

declare(strict_types=1);

namespace OpenAI\Transporters;

use Closure;
use GuzzleHttp\Exception\ClientException;
use JsonException;
use OpenAI\Contracts\TransporterContract;
use OpenAI\Enums\Transporter\ContentType;
use OpenAI\Exceptions\ErrorException;
use OpenAI\Exceptions\TransporterException;
use OpenAI\Exceptions\UnserializableResponse;
use OpenAI\ValueObjects\Transporter\BaseUri;
use OpenAI\ValueObjects\Transporter\Headers;
use OpenAI\ValueObjects\Transporter\Payload;
use OpenAI\ValueObjects\Transporter\QueryParams;
use OpenAI\ValueObjects\Transporter\Response;
use Psr\Http\Client\ClientExceptionInterface;
use Psr\Http\Client\ClientInterface;
use Psr\Http\Message\ResponseInterface;

/**
 * @internal
 */
final class HttpTransporter implements TransporterContract
{
    /**
     * Creates a new Http Transporter instance.
     */
    public function __construct(
        private readonly ClientInterface $client,
        private readonly BaseUri $baseUri,
        private readonly Headers $headers,
        private readonly QueryParams $queryParams,
        private readonly Closure $streamHandler,
    ) {
        // ..
    }

/**
     * {@inheritDoc}
     */
    public function requestObject(Payload $payload): Response
    {
        $request = $payload->toRequest($this->baseUri, $this->headers, $this->queryParams);

$response = $this->sendRequest(fn (): \Psr\Http\Message\ResponseInterface => $this->client->sendRequest($request));

$contents = (string) $response->getBody();

if (str_contains($response->getHeaderLine('Content-Type'), ContentType::TEXT_PLAIN->value)) {
            return Response::from($contents, $response->getHeaders());
        }

$this->throwIfJsonError($response, $contents);

try {
            /** @var array{error?: array{message: string, type: string, code: string}} $data */
            $data = json_decode($contents, true, flags: JSON_THROW_ON_ERROR);
        } catch (JsonException $jsonException) {
            throw new UnserializableResponse($jsonException);
        }

return Response::from($data, $response->getHeaders());
    }

/**
     * {@inheritDoc}
     */
    public function requestContent(Payload $payload): string
    {
        $request = $payload->toRequest($this->baseUri, $this->headers, $this->queryParams);

$response = $this->sendRequest(fn (): \Psr\Http\Message\ResponseInterface => $this->client->sendRequest($request));

$contents = (string) $response->getBody();

$this->throwIfJsonError($response, $contents);

return $contents;
    }

/**
     * {@inheritDoc}
     */
    public function requestStream(Payload $payload): ResponseInterface
    {
        $request = $payload->toRequest($this->baseUri, $this->headers, $this->queryParams);

$response = $this->sendRequest(fn () => ($this->streamHandler)($request));

$this->throwIfJsonError($response, $response);

return $response;
    }

private function sendRequest(Closure $callable): ResponseInterface
    {
        try {
            return $callable();
        } catch (ClientExceptionInterface $clientException) {
            if ($clientException instanceof ClientException) {
                $this->throwIfJsonError($clientException->getResponse(), (string) $clientException->getResponse()->getBody());
            }

throw new TransporterException($clientException);
        }
    }

private function throwIfJsonError(ResponseInterface $response, string|ResponseInterface $contents): void
    {
        if ($response->getStatusCode() < 400) {
            return;
        }

if (! str_contains($response->getHeaderLine('Content-Type'), ContentType::JSON->value)) {
            return;
        }

$statusCode = $response->getStatusCode();

if ($contents instanceof ResponseInterface) {
            $contents = (string) $contents->getBody();
        }

try {
            /** @var array{error?: array{message: string|array<int, string>, type: string, code: string}} $response */
            $response = json_decode($contents, true, flags: JSON_THROW_ON_ERROR);

if (isset($response['error'])) {
                throw new ErrorException($response['error'], $statusCode);
            }
        } catch (JsonException $jsonException) {
            throw new UnserializableResponse($jsonException);
        }
    }
}

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