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const {
ArrayPrototypePush,
ErrorCaptureStackTrace,
FunctionPrototypeBind,
JSONParse,
JSONStringify,
ObjectKeys,
Promise,
} = primordials;
const Buffer = require('buffer').Buffer;
const crypto = require('crypto');
const { ERR_DEBUGGER_ERROR } = require('internal/errors').codes;
const { EventEmitter } = require('events');
const http = require('http');
const URL = require('url');
const debuglog = require('internal/util/debuglog').debuglog('inspect');
const kOpCodeText = 0x1;
const kOpCodeClose = 0x8;
const kFinalBit = 0x80;
const kReserved1Bit = 0x40;
const kReserved2Bit = 0x20;
const kReserved3Bit = 0x10;
const kOpCodeMask = 0xF;
const kMaskBit = 0x80;
const kPayloadLengthMask = 0x7F;
const kMaxSingleBytePayloadLength = 125;
const kMaxTwoBytePayloadLength = 0xFFFF;
const kTwoBytePayloadLengthField = 126;
const kEightBytePayloadLengthField = 127;
const kMaskingKeyWidthInBytes = 4;
// This guid is defined in the Websocket Protocol RFC
// https://tools.ietf.org/html/rfc6455#section-1.3
const WEBSOCKET_HANDSHAKE_GUID = '258EAFA5-E914-47DA-95CA-C5AB0DC85B11';
function unpackError({ code, message }) {
const err = new ERR_DEBUGGER_ERROR(`${message}`);
err.code = code;
ErrorCaptureStackTrace(err, unpackError);
return err;
}
function validateHandshake(requestKey, responseKey) {
const expectedResponseKeyBase = requestKey + WEBSOCKET_HANDSHAKE_GUID;
const shasum = crypto.createHash('sha1');
shasum.update(expectedResponseKeyBase);
const shabuf = shasum.digest();
if (shabuf.toString('base64') !== responseKey) {
throw new ERR_DEBUGGER_ERROR(
`WebSocket secret mismatch: ${requestKey} did not match ${responseKey}`
);
}
}
function encodeFrameHybi17(payload) {
const dataLength = payload.length;
let singleByteLength;
let additionalLength;
if (dataLength > kMaxTwoBytePayloadLength) {
singleByteLength = kEightBytePayloadLengthField;
additionalLength = Buffer.alloc(8);
let remaining = dataLength;
for (let i = 0; i < 8; ++i) {
additionalLength[7 - i] = remaining & 0xFF;
remaining >>= 8;
}
} else if (dataLength > kMaxSingleBytePayloadLength) {
singleByteLength = kTwoBytePayloadLengthField;
additionalLength = Buffer.alloc(2);
additionalLength[0] = (dataLength & 0xFF00) >> 8;
additionalLength[1] = dataLength & 0xFF;
} else {
additionalLength = Buffer.alloc(0);
singleByteLength = dataLength;
}
const header = Buffer.from([
kFinalBit | kOpCodeText,
kMaskBit | singleByteLength,
]);
const mask = Buffer.alloc(4);
const masked = Buffer.alloc(dataLength);
for (let i = 0; i < dataLength; ++i) {
masked[i] = payload[i] ^ mask[i % kMaskingKeyWidthInBytes];
}
return Buffer.concat([header, additionalLength, mask, masked]);
}
function decodeFrameHybi17(data) {
const dataAvailable = data.length;
const notComplete = { closed: false, payload: null, rest: data };
let payloadOffset = 2;
if ((dataAvailable - payloadOffset) < 0) return notComplete;
const firstByte = data[0];
const secondByte = data[1];
const final = (firstByte & kFinalBit) !== 0;
const reserved1 = (firstByte & kReserved1Bit) !== 0;
const reserved2 = (firstByte & kReserved2Bit) !== 0;
const reserved3 = (firstByte & kReserved3Bit) !== 0;
const opCode = firstByte & kOpCodeMask;
const masked = (secondByte & kMaskBit) !== 0;
const compressed = reserved1;
if (compressed) {
throw new ERR_DEBUGGER_ERROR('Compressed frames not supported');
}
if (!final || reserved2 || reserved3) {
throw new ERR_DEBUGGER_ERROR('Only compression extension is supported');
}
if (masked) {
throw new ERR_DEBUGGER_ERROR('Masked server frame - not supported');
}
let closed = false;
switch (opCode) {
case kOpCodeClose:
closed = true;
break;
case kOpCodeText:
break;
default:
throw new ERR_DEBUGGER_ERROR(`Unsupported op code ${opCode}`);
}
let payloadLength = secondByte & kPayloadLengthMask;
switch (payloadLength) {
case kTwoBytePayloadLengthField:
payloadOffset += 2;
payloadLength = (data[2] << 8) + data[3];
break;
case kEightBytePayloadLengthField:
payloadOffset += 8;
payloadLength = 0;
for (let i = 0; i < 8; ++i) {
payloadLength <<= 8;
payloadLength |= data[2 + i];
}
break;
default:
// Nothing. We already have the right size.
}
if ((dataAvailable - payloadOffset - payloadLength) < 0) return notComplete;
const payloadEnd = payloadOffset + payloadLength;
return {
payload: data.slice(payloadOffset, payloadEnd),
rest: data.slice(payloadEnd),
closed,
};
}
class Client extends EventEmitter {
constructor() {
super();
this.handleChunk = FunctionPrototypeBind(this._handleChunk, this);
this._port = undefined;
this._host = undefined;
this.reset();
}
_handleChunk(chunk) {
this._unprocessed = Buffer.concat([this._unprocessed, chunk]);
while (this._unprocessed.length > 2) {
const {
closed,
payload: payloadBuffer,
rest
} = decodeFrameHybi17(this._unprocessed);
this._unprocessed = rest;
if (closed) {
this.reset();
return;
}
if (payloadBuffer === null || payloadBuffer.length === 0) break;
const payloadStr = payloadBuffer.toString();
debuglog('< %s', payloadStr);
const lastChar = payloadStr[payloadStr.length - 1];
if (payloadStr[0] !== '{' || lastChar !== '}') {
throw new ERR_DEBUGGER_ERROR(`Payload does not look like JSON: ${payloadStr}`);
}
let payload;
try {
payload = JSONParse(payloadStr);
} catch (parseError) {
parseError.string = payloadStr;
throw parseError;
}
const { id, method, params, result, error } = payload;
if (id) {
const handler = this._pending[id];
if (handler) {
delete this._pending[id];
handler(error, result);
}
} else if (method) {
this.emit('debugEvent', method, params);
this.emit(method, params);
} else {
throw new ERR_DEBUGGER_ERROR(`Unsupported response: ${payloadStr}`);
}
}
}
reset() {
if (this._http) {
this._http.destroy();
}
if (this._socket) {
this._socket.destroy();
}
this._http = null;
this._lastId = 0;
this._socket = null;
this._pending = {};
this._unprocessed = Buffer.alloc(0);
}
callMethod(method, params) {
return new Promise((resolve, reject) => {
if (!this._socket) {
reject(new ERR_DEBUGGER_ERROR('Use `run` to start the app again.'));
return;
}
const data = { id: ++this._lastId, method, params };
this._pending[data.id] = (error, result) => {
if (error) reject(unpackError(error));
else resolve(ObjectKeys(result).length ? result : undefined);
};
const json = JSONStringify(data);
debuglog('> %s', json);
this._socket.write(encodeFrameHybi17(Buffer.from(json)));
});
}
_fetchJSON(urlPath) {
return new Promise((resolve, reject) => {
const httpReq = http.get({
host: this._host,
port: this._port,
path: urlPath,
});
const chunks = [];
function onResponse(httpRes) {
function parseChunks() {
const resBody = Buffer.concat(chunks).toString();
if (httpRes.statusCode !== 200) {
reject(new ERR_DEBUGGER_ERROR(`Unexpected ${httpRes.statusCode}: ${resBody}`));
return;
}
try {
resolve(JSONParse(resBody));
} catch {
reject(new ERR_DEBUGGER_ERROR(`Response didn't contain JSON: ${resBody}`));
}
}
httpRes.on('error', reject);
httpRes.on('data', (chunk) => ArrayPrototypePush(chunks, chunk));
httpRes.on('end', parseChunks);
}
httpReq.on('error', reject);
httpReq.on('response', onResponse);
});
}
async connect(port, host) {
this._port = port;
this._host = host;
const urlPath = await this._discoverWebsocketPath();
return this._connectWebsocket(urlPath);
}
async _discoverWebsocketPath() {
const { 0: { webSocketDebuggerUrl } } = await this._fetchJSON('/json');
return URL.parse(webSocketDebuggerUrl).path;
}
_connectWebsocket(urlPath) {
this.reset();
const requestKey = crypto.randomBytes(16).toString('base64');
debuglog('request WebSocket', requestKey);
const httpReq = this._http = http.request({
host: this._host,
port: this._port,
path: urlPath,
headers: {
'Connection': 'Upgrade',
'Upgrade': 'websocket',
'Sec-WebSocket-Key': requestKey,
'Sec-WebSocket-Version': '13',
},
});
httpReq.on('error', (e) => {
this.emit('error', e);
});
httpReq.on('response', (httpRes) => {
if (httpRes.statusCode >= 400) {
process.stderr.write(`Unexpected HTTP code: ${httpRes.statusCode}\n`);
httpRes.pipe(process.stderr);
} else {
httpRes.pipe(process.stderr);
}
});
const handshakeListener = (res, socket) => {
validateHandshake(requestKey, res.headers['sec-websocket-accept']);
debuglog('websocket upgrade');
this._socket = socket;
socket.on('data', this.handleChunk);
socket.on('close', () => {
this.emit('close');
});
this.emit('ready');
};
return new Promise((resolve, reject) => {
this.once('error', reject);
this.once('ready', resolve);
httpReq.on('upgrade', handshakeListener);
httpReq.end();
});
}
}
module.exports = Client;
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