lanthaler / fgc-client

<?php

/*

 * (c) Markus Lanthaler <[email protected]>

 *

 * For the full copyright and license information, please view the LICENSE

 * file that was distributed with this source code.

 */

namespace ML\FgcClient;

use Psr\Http\Message\ResponseInterface;

/**

 * HTTP response headers parser

 *

 * More or less a shameless copy of {@link https://github.com/php-http/curl-client curl-client's}

 * {@code HeadersParser}.

 *

 * @author Markus Lanthaler <[email protected]>

 */

class HeaderParser

{

    /**

     * Parse headers and write them to response object.

     *

     * @param string[]          $headers  Response headers as array of header lines.

     * @param ResponseInterface $response Response to write headers to.

     *

     * @return ResponseInterface

     *

     * @throws \InvalidArgumentException For invalid status code arguments.

     * @throws \RuntimeException

     */

    public function parseArray(array $headers, ResponseInterface $response)

    {

        $statusLine = trim(array_shift($headers));

        $parts = explode(' ', $statusLine, 3);

        if (count($parts) < 2 || substr(strtolower($parts[0]), 0, 5) !== 'http/') {

            throw new \RuntimeException(

                sprintf('"%s" is not a valid HTTP status line', $statusLine)

            );

        }

        $reasonPhrase = count($parts) > 2 ? $parts[2] : '';

        $response = $response

            ->withStatus((int) $parts[1], $reasonPhrase)

            ->withProtocolVersion(substr($parts[0], 5));

        foreach ($headers as $headerLine) {

            $headerLine = trim($headerLine);

            if ('' === $headerLine) {

                continue;

            }

            $parts = explode(':', $headerLine, 2);

            if (count($parts) !== 2) {

                throw new \RuntimeException(

                    sprintf('"%s" is not a valid HTTP header line', $headerLine)

                );

            }

            $name = trim(urldecode($parts[0]));

            $value = trim(urldecode($parts[1]));

            if ($response->hasHeader($name)) {

                $response = $response->withAddedHeader($name, $value);

            } else {

                $response = $response->withHeader($name, $value);

            }

        }

        return $response;

    }

}