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<?php
namespace Ratchet\Http;
use Ratchet\MessageInterface;
use Ratchet\ConnectionInterface;
use GuzzleHttp\Psr7 as gPsr;

/**
 * This class receives streaming data from a client request
 * and parses HTTP headers, returning a PSR-7 Request object
 * once it's been buffered
 */
class HttpRequestParser implements MessageInterface {
    const EOM = "\r\n\r\n";

/**
     * The maximum number of bytes the request can be
     * This is a security measure to prevent attacks
     * @var int
     */
    public $maxSize = 4096;

/**
     * @param \Ratchet\ConnectionInterface $context
     * @param string                       $data Data stream to buffer
     * @return \Psr\Http\Message\RequestInterface
     * @throws \OverflowException If the message buffer has become too large
     */
    public function onMessage(ConnectionInterface $context, $data) {
        if (!isset($context->httpBuffer)) {
            $context->httpBuffer = '';
        }

$context->httpBuffer .= $data;

if (strlen($context->httpBuffer) > (int)$this->maxSize) {
            throw new \OverflowException("Maximum buffer size of {$this->maxSize} exceeded parsing HTTP header");
        }

if ($this->isEom($context->httpBuffer)) {
            $request = $this->parse($context->httpBuffer);

unset($context->httpBuffer);

return $request;
        }
    }

/**
     * Determine if the message has been buffered as per the HTTP specification
     * @param  string  $message
     * @return boolean
     */
    public function isEom($message) {
        return (boolean)strpos($message, static::EOM);
    }

/**
     * @param string $headers
     * @return \Psr\Http\Message\RequestInterface
     */
    public function parse($headers) {
        return gPsr\parse_request($headers);
    }
}