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WebsocketHandler.cpp
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271 lines (240 loc) · 7.48 KB
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#include "WebsocketHandler.hpp"
namespace httpsserver {
/**
* @brief Dump the content of the WebSocket frame for debugging.
* @param [in] frame The frame to dump.
*/
static void dumpFrame(WebsocketFrame frame) {
std::ostringstream oss;
oss << "Fin: " << (int)frame.fin << ", OpCode: " << (int)frame.opCode;
switch(frame.opCode) {
case WebsocketHandler::OPCODE_BINARY: {
oss << " BINARY";
break;
}
case WebsocketHandler::OPCODE_CONTINUE: {
oss << " CONTINUE";
break;
}
case WebsocketHandler::OPCODE_CLOSE: {
oss << " CLOSE";
break;
}
case WebsocketHandler::OPCODE_PING: {
oss << " PING";
break;
}
case WebsocketHandler::OPCODE_PONG: {
oss << " PONG";
break;
}
case WebsocketHandler::OPCODE_TEXT: {
oss << " TEXT";
break;
}
default: {
oss << " Unknown";
break;
}
}
oss << ", Mask: " << (int)frame.mask << ", len: " << (int)frame.len;
std::string s = "[Frm] " + oss.str();
HTTPS_DLOG(s.c_str());
} // dumpFrame
WebsocketHandler::WebsocketHandler() {
_con = nullptr;
_receivedClose = false;
_sentClose = false;
}
WebsocketHandler::~WebsocketHandler() {
} // ~WebSocketHandler()
/**
* @brief The default onClose handler.
* If no over-riding handler is provided for the "close" event, this method is called.
*/
void WebsocketHandler::onClose() {
HTTPS_DLOG("[ ] WebsocketHandler close()");
} // onClose
/**
* @brief The default onData handler.
* If no over-riding handler is provided for the "message" event, this method is called.
* A particularly useful pattern for using onMessage is:
* ```
* std::stringstream buffer;
* buffer << pWebSocketInputRecordStreambuf;
* ```
* This will read the whole message into the string stream.
*/
void WebsocketHandler::onMessage(WebsocketInputStreambuf* pWebsocketInputStreambuf) { //, Websocket *pWebSocket) {
HTTPS_DLOG("[ ] WebsocketHandler onMessage()");
} // onData
/**
* @brief The default onError handler.
* If no over-riding handler is provided for the "error" event, this method is called.
*/
void WebsocketHandler::onError(std::string error) {
HTTPS_DLOG("[ ] WebsocketHandler onError()");
} // onError
void WebsocketHandler::initialize(ConnectionContext * con) {
_con = con;
}
void WebsocketHandler::loop() {
if(read() < 0) {
close();
}
}
int WebsocketHandler::read() {
WebsocketFrame frame;
int length = _con->readBuffer((uint8_t*)&frame, sizeof(frame));
HTTPS_DLOGHEX("[ ] read bytes:", length);
if(length == 0)
return 0;
else if (length != sizeof(frame)) {
HTTPS_DLOG("[ERR] Websocket read error");
//_con->closeConnection();
return -1;
}
dumpFrame(frame);
// The following section parses the WebSocket frame.
uint32_t payloadLen = 0;
uint8_t mask[4];
if (frame.len < 126) {
payloadLen = frame.len;
} else if (frame.len == 126) {
uint16_t tempLen;
_con->readBuffer((uint8_t*)&tempLen, sizeof(tempLen));
payloadLen = ntohs(tempLen);
} else if (frame.len == 127) {
uint64_t tempLen;
_con->readBuffer((uint8_t*)&tempLen, sizeof(tempLen));
payloadLen = ntohl((uint32_t)tempLen);
}
if (frame.mask == 1) {
_con->readBuffer(mask, sizeof(mask));
}
if (payloadLen == 0) {
HTTPS_DLOG("[WRN] Web socket payload is not present");
} else {
HTTPS_DLOGHEX("[ ] Web socket payload, length=%d:", payloadLen);
}
switch(frame.opCode) {
case OPCODE_TEXT:
case OPCODE_BINARY: {
HTTPS_DLOG("[ ] Creating Streambuf");
WebsocketInputStreambuf streambuf(_con, payloadLen, frame.mask==1?mask:nullptr);
HTTPS_DLOG("[ ] Calling onMessage");
onMessage(&streambuf);
HTTPS_DLOG("[ ] Discarding Streambuf");
streambuf.discard();
break;
}
case OPCODE_CLOSE: { // If the WebSocket operation code is close then we are closing the connection.
_receivedClose = true;
onClose();
//close(); // Close the websocket.
return -1;
break;
}
case OPCODE_CONTINUE: {
break;
}
case OPCODE_PING: {
break;
}
case OPCODE_PONG: {
break;
}
default: {
HTTPS_DLOGHEX("[ ] WebSocketReader: Unknown opcode: ", frame.opCode);
break;
}
} // Switch opCode
return 0;
} // Websocket::read
/**
* @brief Close the Web socket
* @param [in] status The code passed in the close request.
* @param [in] message A clarification message on the close request.
*/
void WebsocketHandler::close(uint16_t status, std::string message) {
HTTPS_DLOG("[ ] >> Websocket close()");
_sentClose = true; // Flag that we have sent a close request.
WebsocketFrame frame; // Build the web socket frame indicating a close request.
frame.fin = 1;
frame.rsv1 = 0;
frame.rsv2 = 0;
frame.rsv3 = 0;
frame.opCode = OPCODE_CLOSE;
frame.mask = 0;
frame.len = message.length() + 2;
int rc = _con->writeBuffer((uint8_t *)&frame, sizeof(frame));
if (rc > 0) {
rc = _con->writeBuffer((byte *) &status, 2);
}
if (rc > 0) {
_con->writeBuffer((byte *) message.data(), message.length());
}
} // Websocket::close
/**
* @brief Send data down the web socket
* See the WebSocket spec (RFC6455) section "6.1 Sending Data".
* We build a WebSocket frame, send the frame followed by the data.
* @param [in] data The data to send down the WebSocket.
* @param [in] sendType The type of payload. Either SEND_TYPE_TEXT or SEND_TYPE_BINARY.
*/
void WebsocketHandler::send(std::string data, uint8_t sendType) {
HTTPS_DLOGHEX(">> Websocket.send: Length: ", data.length());
WebsocketFrame frame;
frame.fin = 1;
frame.rsv1 = 0;
frame.rsv2 = 0;
frame.rsv3 = 0;
frame.opCode = sendType==SEND_TYPE_TEXT?OPCODE_TEXT:OPCODE_BINARY;
frame.mask = 0;
if (data.length() < 126) {
frame.len = data.length();
_con->writeBuffer((uint8_t *)&frame, sizeof(frame));
} else {
frame.len = 126;
_con->writeBuffer((uint8_t *)&frame, sizeof(frame));
uint16_t net_len = htons((uint16_t)data.length());
_con->writeBuffer((uint8_t *)&net_len, sizeof(uint16_t)); // Convert to network byte order from host byte order
}
_con->writeBuffer((uint8_t*)data.data(), data.length());
HTTPS_DLOG("[ ] << Websocket.send");
} // Websocket::send
/**
* @brief Send data down the web socket
* See the WebSocket spec (RFC6455) section "6.1 Sending Data".
* We build a WebSocket frame, send the frame followed by the data.
* @param [in] data The data to send down the WebSocket.
* @param [in] sendType The type of payload. Either SEND_TYPE_TEXT or SEND_TYPE_BINARY.
*/
void WebsocketHandler::send(uint8_t* data, uint16_t length, uint8_t sendType) {
HTTPS_DLOGHEX("[ ] >> Websocket.send: Length: ", length);
WebsocketFrame frame;
frame.fin = 1;
frame.rsv1 = 0;
frame.rsv2 = 0;
frame.rsv3 = 0;
frame.opCode = sendType==SEND_TYPE_TEXT?OPCODE_TEXT:OPCODE_BINARY;
frame.mask = 0;
if (length < 126) {
frame.len = length;
_con->writeBuffer((uint8_t *)&frame, sizeof(frame));
} else {
frame.len = 126;
_con->writeBuffer((uint8_t *)&frame, sizeof(frame));
uint16_t net_len = htons(length);
_con->writeBuffer((uint8_t *) net_len, sizeof(uint16_t)); // Convert to network byte order from host byte order
}
_con->writeBuffer(data, length);
HTTPS_DLOG("[ ] << Websocket.send");
} // Websocket::send
/**
* Returns true if the connection has been closed, either by client or server
*/
bool WebsocketHandler::closed() {
return _receivedClose || _sentClose;
}
}