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|
<?php
namespace React\Http\Io;
use Evenement\EventEmitter;
use React\Stream\ReadableStreamInterface;
use React\Stream\Util;
use React\Stream\WritableStreamInterface;
use Exception;
/**
* [Internal] Decodes "Transfer-Encoding: chunked" from given stream and returns only payload data.
*
* This is used internally to decode incoming requests with this encoding.
*
* @internal
*/
class ChunkedDecoder extends EventEmitter implements ReadableStreamInterface
{
const CRLF = "\r\n";
const MAX_CHUNK_HEADER_SIZE = 1024;
private $closed = false;
private $input;
private $buffer = '';
private $chunkSize = 0;
private $transferredSize = 0;
private $headerCompleted = false;
public function __construct(ReadableStreamInterface $input)
{
$this->input = $input;
$this->input->on('data', array($this, 'handleData'));
$this->input->on('end', array($this, 'handleEnd'));
$this->input->on('error', array($this, 'handleError'));
$this->input->on('close', array($this, 'close'));
}
public function isReadable()
{
return !$this->closed && $this->input->isReadable();
}
public function pause()
{
$this->input->pause();
}
public function resume()
{
$this->input->resume();
}
public function pipe(WritableStreamInterface $dest, array $options = array())
{
Util::pipe($this, $dest, $options);
return $dest;
}
public function close()
{
if ($this->closed) {
return;
}
$this->buffer = '';
$this->closed = true;
$this->input->close();
$this->emit('close');
$this->removeAllListeners();
}
/** @internal */
public function handleEnd()
{
if (!$this->closed) {
$this->handleError(new Exception('Unexpected end event'));
}
}
/** @internal */
public function handleError(Exception $e)
{
$this->emit('error', array($e));
$this->close();
}
/** @internal */
public function handleData($data)
{
$this->buffer .= $data;
while ($this->buffer !== '') {
if (!$this->headerCompleted) {
$positionCrlf = \strpos($this->buffer, static::CRLF);
if ($positionCrlf === false) {
// Header shouldn't be bigger than 1024 bytes
if (isset($this->buffer[static::MAX_CHUNK_HEADER_SIZE])) {
$this->handleError(new Exception('Chunk header size inclusive extension bigger than' . static::MAX_CHUNK_HEADER_SIZE. ' bytes'));
}
return;
}
$header = \strtolower((string)\substr($this->buffer, 0, $positionCrlf));
$hexValue = $header;
if (\strpos($header, ';') !== false) {
$array = \explode(';', $header);
$hexValue = $array[0];
}
if ($hexValue !== '') {
$hexValue = \ltrim(\trim($hexValue), "0");
if ($hexValue === '') {
$hexValue = "0";
}
}
$this->chunkSize = @\hexdec($hexValue);
if (!\is_int($this->chunkSize) || \dechex($this->chunkSize) !== $hexValue) {
$this->handleError(new Exception($hexValue . ' is not a valid hexadecimal number'));
return;
}
$this->buffer = (string)\substr($this->buffer, $positionCrlf + 2);
$this->headerCompleted = true;
if ($this->buffer === '') {
return;
}
}
$chunk = (string)\substr($this->buffer, 0, $this->chunkSize - $this->transferredSize);
if ($chunk !== '') {
$this->transferredSize += \strlen($chunk);
$this->emit('data', array($chunk));
$this->buffer = (string)\substr($this->buffer, \strlen($chunk));
}
$positionCrlf = \strpos($this->buffer, static::CRLF);
if ($positionCrlf === 0) {
if ($this->chunkSize === 0) {
$this->emit('end');
$this->close();
return;
}
$this->chunkSize = 0;
$this->headerCompleted = false;
$this->transferredSize = 0;
$this->buffer = (string)\substr($this->buffer, 2);
} elseif ($this->chunkSize === 0) {
// end chunk received, skip all trailer data
$this->buffer = (string)\substr($this->buffer, $positionCrlf);
}
if ($positionCrlf !== 0 && $this->chunkSize !== 0 && $this->chunkSize === $this->transferredSize && \strlen($this->buffer) > 2) {
// the first 2 characters are not CRLF, send error event
$this->handleError(new Exception('Chunk does not end with a CRLF'));
return;
}
if ($positionCrlf !== 0 && \strlen($this->buffer) < 2) {
// No CRLF found, wait for additional data which could be a CRLF
return;
}
}
}
}
|
