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Editing: GuzzleClient.php

<?php

namespace Twilio\Http;

use GuzzleHttp\ClientInterface;
use GuzzleHttp\Exception\BadResponseException;
use GuzzleHttp\Psr7\Query;
use GuzzleHttp\Psr7\Request;
use Twilio\Exceptions\HttpException;

final class GuzzleClient implements Client {
    /**
     * @var ClientInterface
     */
    private $client;

public function __construct(ClientInterface $client) {
        $this->client = $client;
    }

public function request(string $method, string $url,
                            array $params = [], array $data = [], array $headers = [],
                            string $user = null, string $password = null,
                            int $timeout = null): Response {
        try {
            $options = [
                'timeout' => $timeout,
                'auth' => [$user, $password],
                'allow_redirects' => false,
            ];

if ($params) {
                $options['query'] = Query::build($params, PHP_QUERY_RFC1738);
            }

if ($method === 'POST') {
                if ($this->hasFile($data)) {
                    $options['multipart'] = $this->buildMultipartParam($data);
                } else {
                    $options['body'] = Query::build($data, PHP_QUERY_RFC1738);
                    $headers['Content-Type'] = 'application/x-www-form-urlencoded';
                }
            }

$response = $this->client->send(new Request($method, $url, $headers), $options);
        } catch (BadResponseException $exception) {
            $response = $exception->getResponse();
        } catch (\Exception $exception) {
            throw new HttpException('Unable to complete the HTTP request', 0, $exception);
        }

// Casting the body (stream) to a string performs a rewind, ensuring we return the entire response.
        // See https://stackoverflow.com/a/30549372/86696
        return new Response($response->getStatusCode(), (string)$response->getBody(), $response->getHeaders());
    }

private function hasFile(array $data): bool {
        foreach ($data as $value) {
            if ($value instanceof File) {
                return true;
            }
        }

return false;
    }

private function buildMultipartParam(array $data): array {
        $multipart = [];
        foreach ($data as $key => $value) {
            if ($value instanceof File) {
                $contents = $value->getContents();
                if ($contents === null) {
                    $contents = fopen($value->getFileName(), 'rb');
                }

$chunk = [
                    'name' => $key,
                    'contents' => $contents,
                    'filename' => $value->getFileName(),
                ];

if ($value->getContentType() !== null) {
                    $chunk['headers']['Content-Type'] = $value->getContentType();
                }
            } else {
                $chunk = [
                    'name' => $key,
                    'contents' => $value,
                ];
            }

$multipart[] = $chunk;
        }

return $multipart;
    }
}

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