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<?php
namespace React\Http\Io;
use Evenement\EventEmitter;
use Psr\Http\Message\ServerRequestInterface;
use React\Http\Message\Response;
use React\Http\Message\ServerRequest;
use React\Socket\ConnectionInterface;
use Exception;
/**
* [Internal] Parses an incoming request header from an input stream
*
* This is used internally to parse the request header from the connection and
* then process the remaining connection as the request body.
*
* @event headers
* @event error
*
* @internal
*/
class RequestHeaderParser extends EventEmitter
{
private $maxSize = 8192;
/** @var Clock */
private $clock;
/** @var array<string|int,array<string,string>> */
private $connectionParams = array();
public function __construct(Clock $clock)
{
$this->clock = $clock;
}
public function handle(ConnectionInterface $conn)
{
$buffer = '';
$maxSize = $this->maxSize;
$that = $this;
$conn->on('data', $fn = function ($data) use (&$buffer, &$fn, $conn, $maxSize, $that) {
// append chunk of data to buffer and look for end of request headers
$buffer .= $data;
$endOfHeader = \strpos($buffer, "\r\n\r\n");
// reject request if buffer size is exceeded
if ($endOfHeader > $maxSize || ($endOfHeader === false && isset($buffer[$maxSize]))) {
$conn->removeListener('data', $fn);
$fn = null;
$that->emit('error', array(
new \OverflowException("Maximum header size of {$maxSize} exceeded.", Response::STATUS_REQUEST_HEADER_FIELDS_TOO_LARGE),
$conn
));
return;
}
// ignore incomplete requests
if ($endOfHeader === false) {
return;
}
// request headers received => try to parse request
$conn->removeListener('data', $fn);
$fn = null;
try {
$request = $that->parseRequest(
(string)\substr($buffer, 0, $endOfHeader + 2),
$conn
);
} catch (Exception $exception) {
$buffer = '';
$that->emit('error', array(
$exception,
$conn
));
return;
}
$contentLength = 0;
if ($request->hasHeader('Transfer-Encoding')) {
$contentLength = null;
} elseif ($request->hasHeader('Content-Length')) {
$contentLength = (int)$request->getHeaderLine('Content-Length');
}
if ($contentLength === 0) {
// happy path: request body is known to be empty
$stream = new EmptyBodyStream();
$request = $request->withBody($stream);
} else {
// otherwise body is present => delimit using Content-Length or ChunkedDecoder
$stream = new CloseProtectionStream($conn);
if ($contentLength !== null) {
$stream = new LengthLimitedStream($stream, $contentLength);
} else {
$stream = new ChunkedDecoder($stream);
}
$request = $request->withBody(new HttpBodyStream($stream, $contentLength));
}
$bodyBuffer = isset($buffer[$endOfHeader + 4]) ? \substr($buffer, $endOfHeader + 4) : '';
$buffer = '';
$that->emit('headers', array($request, $conn));
if ($bodyBuffer !== '') {
$conn->emit('data', array($bodyBuffer));
}
// happy path: request body is known to be empty => immediately end stream
if ($contentLength === 0) {
$stream->emit('end');
$stream->close();
}
});
}
/**
* @param string $headers buffer string containing request headers only
* @param ConnectionInterface $connection
* @return ServerRequestInterface
* @throws \InvalidArgumentException
* @internal
*/
public function parseRequest($headers, ConnectionInterface $connection)
{
// reuse same connection params for all server params for this connection
$cid = \PHP_VERSION_ID < 70200 ? \spl_object_hash($connection) : \spl_object_id($connection);
if (isset($this->connectionParams[$cid])) {
$serverParams = $this->connectionParams[$cid];
} else {
// assign new server params for new connection
$serverParams = array();
// scheme is `http` unless TLS is used
$localSocketUri = $connection->getLocalAddress();
$localParts = $localSocketUri === null ? array() : \parse_url($localSocketUri);
if (isset($localParts['scheme']) && $localParts['scheme'] === 'tls') {
$serverParams['HTTPS'] = 'on';
}
// apply SERVER_ADDR and SERVER_PORT if server address is known
// address should always be known, even for Unix domain sockets (UDS)
// but skip UDS as it doesn't have a concept of host/port.
if ($localSocketUri !== null && isset($localParts['host'], $localParts['port'])) {
$serverParams['SERVER_ADDR'] = $localParts['host'];
$serverParams['SERVER_PORT'] = $localParts['port'];
}
// apply REMOTE_ADDR and REMOTE_PORT if source address is known
// address should always be known, unless this is over Unix domain sockets (UDS)
$remoteSocketUri = $connection->getRemoteAddress();
if ($remoteSocketUri !== null) {
$remoteAddress = \parse_url($remoteSocketUri);
$serverParams['REMOTE_ADDR'] = $remoteAddress['host'];
$serverParams['REMOTE_PORT'] = $remoteAddress['port'];
}
// remember server params for all requests from this connection, reset on connection close
$this->connectionParams[$cid] = $serverParams;
$params =& $this->connectionParams;
$connection->on('close', function () use (&$params, $cid) {
assert(\is_array($params));
unset($params[$cid]);
});
}
// create new obj implementing ServerRequestInterface by preserving all
// previous properties and restoring original request-target
$serverParams['REQUEST_TIME'] = (int) ($now = $this->clock->now());
$serverParams['REQUEST_TIME_FLOAT'] = $now;
return ServerRequest::parseMessage($headers, $serverParams);
}
}