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<?php |
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namespace WSSC\Components; |
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use WSSC\Contracts\CommonsContract; |
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use WSSC\Contracts\WebSocketServerContract; |
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/** |
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* Class WssMain |
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* @package WSSC\Components |
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* |
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* @property ServerConfig config |
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*/ |
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class WssMain implements CommonsContract |
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{ |
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private $isPcntlLoaded = false; |
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/** |
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* Message frames decoder |
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* |
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* @param string $data |
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* @return mixed null on empty data|false on improper data|array - on success |
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*/ |
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protected function decode(string $data) |
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{ |
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if (empty($data)) { |
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return NULL; // close has been sent |
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} |
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$unmaskedPayload = ''; |
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$decodedData = []; |
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// estimate frame type: |
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$firstByteBinary = sprintf('%08b', ord($data[0])); |
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$secondByteBinary = sprintf('%08b', ord($data[1])); |
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$isMasked = $secondByteBinary[0] === '1'; |
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$payloadLength = ord($data[1]) & self::MASK_127; |
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// unmasked frame is received: |
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if (!$isMasked) { |
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return ['type' => '', 'payload' => '', 'error' => WebSocketServerContract::ERR_PROTOCOL]; |
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} |
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$this->getTypeByOpCode($firstByteBinary, $decodedData); |
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if (empty($decodedData['type'])) { |
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return ['type' => '', 'payload' => '', 'error' => WebSocketServerContract::ERR_UNKNOWN_OPCODE]; |
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} |
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$mask = substr($data, 2, 4); |
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$payloadOffset = WebSocketServerContract::PAYLOAD_OFFSET_6; |
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$dataLength = $payloadLength + $payloadOffset; |
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if ($payloadLength === self::MASK_126) { |
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$mask = substr($data, 4, 4); |
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$payloadOffset = WebSocketServerContract::PAYLOAD_OFFSET_8; |
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$dataLength = bindec(sprintf('%08b', ord($data[2])) . sprintf('%08b', ord($data[3]))) + $payloadOffset; |
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} elseif ($payloadLength === self::MASK_127) { |
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$mask = substr($data, 10, 4); |
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$payloadOffset = WebSocketServerContract::PAYLOAD_OFFSET_14; |
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$tmp = ''; |
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for ($i = 0; $i < 8; $i++) { |
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$tmp .= sprintf('%08b', ord($data[$i + 2])); |
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} |
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$dataLength = bindec($tmp) + $payloadOffset; |
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unset($tmp); |
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} |
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/** |
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* We have to check for large frames here. socket_recv cuts at 1024 bytes |
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* so if websocket-frame is > 1024 bytes we have to wait until whole |
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* data is transferd. |
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*/ |
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if (strlen($data) < $dataLength) { |
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return false; |
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} |
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if ($isMasked) { |
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for ($i = $payloadOffset; $i < $dataLength; $i++) { |
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$j = $i - $payloadOffset; |
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if (isset($data[$i])) { |
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$unmaskedPayload .= $data[$i] ^ $mask[$j % 4]; |
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} |
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} |
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$decodedData['payload'] = $unmaskedPayload; |
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} else { |
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$payloadOffset -= 4; |
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$decodedData['payload'] = substr($data, $payloadOffset); |
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} |
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return $decodedData; |
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} |
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/** |
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* Returns true if pcntl ext loaded and false otherwise |
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* @return bool |
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*/ |
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protected function isPcntlLoaded(): bool |
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{ |
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return $this->isPcntlLoaded; |
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} |
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/** |
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* Sets pre-loaded pcntl state |
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* @param bool $isPcntlLoaded |
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*/ |
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protected function setIsPcntlLoaded(bool $isPcntlLoaded): void |
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{ |
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$this->isPcntlLoaded = $isPcntlLoaded; |
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} |
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/** |
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* Detects decode data type |
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* @param string $firstByteBinary |
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* @param array $decodedData |
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*/ |
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private function getTypeByOpCode(string $firstByteBinary, array &$decodedData) |
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{ |
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$opcode = bindec(substr($firstByteBinary, 4, 4)); |
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switch ($opcode) { |
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// text frame: |
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case self::DECODE_TEXT: |
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$decodedData['type'] = self::EVENT_TYPE_TEXT; |
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break; |
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case self::DECODE_BINARY: |
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$decodedData['type'] = self::EVENT_TYPE_BINARY; |
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break; |
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// connection close frame: |
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case self::DECODE_CLOSE: |
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$decodedData['type'] = self::EVENT_TYPE_CLOSE; |
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break; |
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// ping frame: |
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case self::DECODE_PING: |
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$decodedData['type'] = self::EVENT_TYPE_PING; |
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break; |
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// pong frame: |
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case self::DECODE_PONG: |
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$decodedData['type'] = self::EVENT_TYPE_PONG; |
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break; |
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default: |
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$decodedData['type'] = ''; |
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break; |
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} |
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} |
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} |
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arthurkushman /
php-wss
