786 lines
27 KiB
JavaScript
786 lines
27 KiB
JavaScript
"use strict";
|
|
Object.defineProperty(exports, "__esModule", { value: true });
|
|
exports.Server = exports.BaseServer = void 0;
|
|
const qs = require("querystring");
|
|
const url_1 = require("url");
|
|
const base64id = require("base64id");
|
|
const transports_1 = require("./transports");
|
|
const events_1 = require("events");
|
|
const socket_1 = require("./socket");
|
|
const debug_1 = require("debug");
|
|
const cookie_1 = require("cookie");
|
|
const ws_1 = require("ws");
|
|
const webtransport_1 = require("./transports/webtransport");
|
|
const engine_io_parser_1 = require("engine.io-parser");
|
|
const debug = (0, debug_1.default)("engine");
|
|
const kResponseHeaders = Symbol("responseHeaders");
|
|
function parseSessionId(data) {
|
|
try {
|
|
const parsed = JSON.parse(data);
|
|
if (typeof parsed.sid === "string") {
|
|
return parsed.sid;
|
|
}
|
|
}
|
|
catch (e) { }
|
|
}
|
|
class BaseServer extends events_1.EventEmitter {
|
|
/**
|
|
* Server constructor.
|
|
*
|
|
* @param {Object} opts - options
|
|
*/
|
|
constructor(opts = {}) {
|
|
super();
|
|
this.middlewares = [];
|
|
this.clients = {};
|
|
this.clientsCount = 0;
|
|
this.opts = Object.assign({
|
|
wsEngine: ws_1.Server,
|
|
pingTimeout: 20000,
|
|
pingInterval: 25000,
|
|
upgradeTimeout: 10000,
|
|
maxHttpBufferSize: 1e6,
|
|
transports: ["polling", "websocket"], // WebTransport is disabled by default
|
|
allowUpgrades: true,
|
|
httpCompression: {
|
|
threshold: 1024,
|
|
},
|
|
cors: false,
|
|
allowEIO3: false,
|
|
}, opts);
|
|
if (opts.cookie) {
|
|
this.opts.cookie = Object.assign({
|
|
name: "io",
|
|
path: "/",
|
|
// @ts-ignore
|
|
httpOnly: opts.cookie.path !== false,
|
|
sameSite: "lax",
|
|
}, opts.cookie);
|
|
}
|
|
if (this.opts.cors) {
|
|
this.use(require("cors")(this.opts.cors));
|
|
}
|
|
if (opts.perMessageDeflate) {
|
|
this.opts.perMessageDeflate = Object.assign({
|
|
threshold: 1024,
|
|
}, opts.perMessageDeflate);
|
|
}
|
|
this.init();
|
|
}
|
|
/**
|
|
* Compute the pathname of the requests that are handled by the server
|
|
* @param options
|
|
* @protected
|
|
*/
|
|
_computePath(options) {
|
|
let path = (options.path || "/engine.io").replace(/\/$/, "");
|
|
if (options.addTrailingSlash !== false) {
|
|
// normalize path
|
|
path += "/";
|
|
}
|
|
return path;
|
|
}
|
|
/**
|
|
* Returns a list of available transports for upgrade given a certain transport.
|
|
*
|
|
* @return {Array}
|
|
*/
|
|
upgrades(transport) {
|
|
if (!this.opts.allowUpgrades)
|
|
return [];
|
|
return transports_1.default[transport].upgradesTo || [];
|
|
}
|
|
/**
|
|
* Verifies a request.
|
|
*
|
|
* @param {EngineRequest} req
|
|
* @param upgrade - whether it's an upgrade request
|
|
* @param fn
|
|
* @protected
|
|
*/
|
|
verify(req, upgrade, fn) {
|
|
// transport check
|
|
const transport = req._query.transport;
|
|
// WebTransport does not go through the verify() method, see the onWebTransportSession() method
|
|
if (!~this.opts.transports.indexOf(transport) ||
|
|
transport === "webtransport") {
|
|
debug('unknown transport "%s"', transport);
|
|
return fn(Server.errors.UNKNOWN_TRANSPORT, { transport });
|
|
}
|
|
// 'Origin' header check
|
|
const isOriginInvalid = checkInvalidHeaderChar(req.headers.origin);
|
|
if (isOriginInvalid) {
|
|
const origin = req.headers.origin;
|
|
req.headers.origin = null;
|
|
debug("origin header invalid");
|
|
return fn(Server.errors.BAD_REQUEST, {
|
|
name: "INVALID_ORIGIN",
|
|
origin,
|
|
});
|
|
}
|
|
// sid check
|
|
const sid = req._query.sid;
|
|
if (sid) {
|
|
if (!this.clients.hasOwnProperty(sid)) {
|
|
debug('unknown sid "%s"', sid);
|
|
return fn(Server.errors.UNKNOWN_SID, {
|
|
sid,
|
|
});
|
|
}
|
|
const previousTransport = this.clients[sid].transport.name;
|
|
if (!upgrade && previousTransport !== transport) {
|
|
debug("bad request: unexpected transport without upgrade");
|
|
return fn(Server.errors.BAD_REQUEST, {
|
|
name: "TRANSPORT_MISMATCH",
|
|
transport,
|
|
previousTransport,
|
|
});
|
|
}
|
|
}
|
|
else {
|
|
// handshake is GET only
|
|
if ("GET" !== req.method) {
|
|
return fn(Server.errors.BAD_HANDSHAKE_METHOD, {
|
|
method: req.method,
|
|
});
|
|
}
|
|
if (transport === "websocket" && !upgrade) {
|
|
debug("invalid transport upgrade");
|
|
return fn(Server.errors.BAD_REQUEST, {
|
|
name: "TRANSPORT_HANDSHAKE_ERROR",
|
|
});
|
|
}
|
|
if (!this.opts.allowRequest)
|
|
return fn();
|
|
return this.opts.allowRequest(req, (message, success) => {
|
|
if (!success) {
|
|
return fn(Server.errors.FORBIDDEN, {
|
|
message,
|
|
});
|
|
}
|
|
fn();
|
|
});
|
|
}
|
|
fn();
|
|
}
|
|
/**
|
|
* Adds a new middleware.
|
|
*
|
|
* @example
|
|
* import helmet from "helmet";
|
|
*
|
|
* engine.use(helmet());
|
|
*
|
|
* @param fn
|
|
*/
|
|
use(fn) {
|
|
this.middlewares.push(fn);
|
|
}
|
|
/**
|
|
* Apply the middlewares to the request.
|
|
*
|
|
* @param req
|
|
* @param res
|
|
* @param callback
|
|
* @protected
|
|
*/
|
|
_applyMiddlewares(req, res, callback) {
|
|
if (this.middlewares.length === 0) {
|
|
debug("no middleware to apply, skipping");
|
|
return callback();
|
|
}
|
|
const apply = (i) => {
|
|
debug("applying middleware n°%d", i + 1);
|
|
this.middlewares[i](req, res, (err) => {
|
|
if (err) {
|
|
return callback(err);
|
|
}
|
|
if (i + 1 < this.middlewares.length) {
|
|
apply(i + 1);
|
|
}
|
|
else {
|
|
callback();
|
|
}
|
|
});
|
|
};
|
|
apply(0);
|
|
}
|
|
/**
|
|
* Closes all clients.
|
|
*/
|
|
close() {
|
|
debug("closing all open clients");
|
|
for (let i in this.clients) {
|
|
if (this.clients.hasOwnProperty(i)) {
|
|
this.clients[i].close(true);
|
|
}
|
|
}
|
|
this.cleanup();
|
|
return this;
|
|
}
|
|
/**
|
|
* generate a socket id.
|
|
* Overwrite this method to generate your custom socket id
|
|
*
|
|
* @param {IncomingMessage} req - the request object
|
|
*/
|
|
generateId(req) {
|
|
return base64id.generateId();
|
|
}
|
|
/**
|
|
* Handshakes a new client.
|
|
*
|
|
* @param {String} transportName
|
|
* @param {Object} req - the request object
|
|
* @param {Function} closeConnection
|
|
*
|
|
* @protected
|
|
*/
|
|
async handshake(transportName, req, closeConnection) {
|
|
const protocol = req._query.EIO === "4" ? 4 : 3; // 3rd revision by default
|
|
if (protocol === 3 && !this.opts.allowEIO3) {
|
|
debug("unsupported protocol version");
|
|
this.emit("connection_error", {
|
|
req,
|
|
code: Server.errors.UNSUPPORTED_PROTOCOL_VERSION,
|
|
message: Server.errorMessages[Server.errors.UNSUPPORTED_PROTOCOL_VERSION],
|
|
context: {
|
|
protocol,
|
|
},
|
|
});
|
|
closeConnection(Server.errors.UNSUPPORTED_PROTOCOL_VERSION);
|
|
return;
|
|
}
|
|
let id;
|
|
try {
|
|
id = await this.generateId(req);
|
|
}
|
|
catch (e) {
|
|
debug("error while generating an id");
|
|
this.emit("connection_error", {
|
|
req,
|
|
code: Server.errors.BAD_REQUEST,
|
|
message: Server.errorMessages[Server.errors.BAD_REQUEST],
|
|
context: {
|
|
name: "ID_GENERATION_ERROR",
|
|
error: e,
|
|
},
|
|
});
|
|
closeConnection(Server.errors.BAD_REQUEST);
|
|
return;
|
|
}
|
|
debug('handshaking client "%s"', id);
|
|
try {
|
|
var transport = this.createTransport(transportName, req);
|
|
if ("polling" === transportName) {
|
|
transport.maxHttpBufferSize = this.opts.maxHttpBufferSize;
|
|
transport.httpCompression = this.opts.httpCompression;
|
|
}
|
|
else if ("websocket" === transportName) {
|
|
transport.perMessageDeflate = this.opts.perMessageDeflate;
|
|
}
|
|
}
|
|
catch (e) {
|
|
debug('error handshaking to transport "%s"', transportName);
|
|
this.emit("connection_error", {
|
|
req,
|
|
code: Server.errors.BAD_REQUEST,
|
|
message: Server.errorMessages[Server.errors.BAD_REQUEST],
|
|
context: {
|
|
name: "TRANSPORT_HANDSHAKE_ERROR",
|
|
error: e,
|
|
},
|
|
});
|
|
closeConnection(Server.errors.BAD_REQUEST);
|
|
return;
|
|
}
|
|
const socket = new socket_1.Socket(id, this, transport, req, protocol);
|
|
transport.on("headers", (headers, req) => {
|
|
const isInitialRequest = !req._query.sid;
|
|
if (isInitialRequest) {
|
|
if (this.opts.cookie) {
|
|
headers["Set-Cookie"] = [
|
|
// @ts-ignore
|
|
(0, cookie_1.serialize)(this.opts.cookie.name, id, this.opts.cookie),
|
|
];
|
|
}
|
|
this.emit("initial_headers", headers, req);
|
|
}
|
|
this.emit("headers", headers, req);
|
|
});
|
|
transport.onRequest(req);
|
|
this.clients[id] = socket;
|
|
this.clientsCount++;
|
|
socket.once("close", () => {
|
|
delete this.clients[id];
|
|
this.clientsCount--;
|
|
});
|
|
this.emit("connection", socket);
|
|
return transport;
|
|
}
|
|
async onWebTransportSession(session) {
|
|
const timeout = setTimeout(() => {
|
|
debug("the client failed to establish a bidirectional stream in the given period");
|
|
session.close();
|
|
}, this.opts.upgradeTimeout);
|
|
const streamReader = session.incomingBidirectionalStreams.getReader();
|
|
const result = await streamReader.read();
|
|
if (result.done) {
|
|
debug("session is closed");
|
|
return;
|
|
}
|
|
const stream = result.value;
|
|
const transformStream = (0, engine_io_parser_1.createPacketDecoderStream)(this.opts.maxHttpBufferSize, "nodebuffer");
|
|
const reader = stream.readable.pipeThrough(transformStream).getReader();
|
|
// reading the first packet of the stream
|
|
const { value, done } = await reader.read();
|
|
if (done) {
|
|
debug("stream is closed");
|
|
return;
|
|
}
|
|
clearTimeout(timeout);
|
|
if (value.type !== "open") {
|
|
debug("invalid WebTransport handshake");
|
|
return session.close();
|
|
}
|
|
if (value.data === undefined) {
|
|
const transport = new webtransport_1.WebTransport(session, stream, reader);
|
|
// note: we cannot use "this.generateId()", because there is no "req" argument
|
|
const id = base64id.generateId();
|
|
debug('handshaking client "%s" (WebTransport)', id);
|
|
const socket = new socket_1.Socket(id, this, transport, null, 4);
|
|
this.clients[id] = socket;
|
|
this.clientsCount++;
|
|
socket.once("close", () => {
|
|
delete this.clients[id];
|
|
this.clientsCount--;
|
|
});
|
|
this.emit("connection", socket);
|
|
return;
|
|
}
|
|
const sid = parseSessionId(value.data);
|
|
if (!sid) {
|
|
debug("invalid WebTransport handshake");
|
|
return session.close();
|
|
}
|
|
const client = this.clients[sid];
|
|
if (!client) {
|
|
debug("upgrade attempt for closed client");
|
|
session.close();
|
|
}
|
|
else if (client.upgrading) {
|
|
debug("transport has already been trying to upgrade");
|
|
session.close();
|
|
}
|
|
else if (client.upgraded) {
|
|
debug("transport had already been upgraded");
|
|
session.close();
|
|
}
|
|
else {
|
|
debug("upgrading existing transport");
|
|
const transport = new webtransport_1.WebTransport(session, stream, reader);
|
|
client._maybeUpgrade(transport);
|
|
}
|
|
}
|
|
}
|
|
exports.BaseServer = BaseServer;
|
|
/**
|
|
* Protocol errors mappings.
|
|
*/
|
|
BaseServer.errors = {
|
|
UNKNOWN_TRANSPORT: 0,
|
|
UNKNOWN_SID: 1,
|
|
BAD_HANDSHAKE_METHOD: 2,
|
|
BAD_REQUEST: 3,
|
|
FORBIDDEN: 4,
|
|
UNSUPPORTED_PROTOCOL_VERSION: 5,
|
|
};
|
|
BaseServer.errorMessages = {
|
|
0: "Transport unknown",
|
|
1: "Session ID unknown",
|
|
2: "Bad handshake method",
|
|
3: "Bad request",
|
|
4: "Forbidden",
|
|
5: "Unsupported protocol version",
|
|
};
|
|
/**
|
|
* Exposes a subset of the http.ServerResponse interface, in order to be able to apply the middlewares to an upgrade
|
|
* request.
|
|
*
|
|
* @see https://nodejs.org/api/http.html#class-httpserverresponse
|
|
*/
|
|
class WebSocketResponse {
|
|
constructor(req, socket) {
|
|
this.req = req;
|
|
this.socket = socket;
|
|
// temporarily store the response headers on the req object (see the "headers" event)
|
|
req[kResponseHeaders] = {};
|
|
}
|
|
setHeader(name, value) {
|
|
this.req[kResponseHeaders][name] = value;
|
|
}
|
|
getHeader(name) {
|
|
return this.req[kResponseHeaders][name];
|
|
}
|
|
removeHeader(name) {
|
|
delete this.req[kResponseHeaders][name];
|
|
}
|
|
write() { }
|
|
writeHead() { }
|
|
end() {
|
|
// we could return a proper error code, but the WebSocket client will emit an "error" event anyway.
|
|
this.socket.destroy();
|
|
}
|
|
}
|
|
/**
|
|
* An Engine.IO server based on Node.js built-in HTTP server and the `ws` package for WebSocket connections.
|
|
*/
|
|
class Server extends BaseServer {
|
|
/**
|
|
* Initialize websocket server
|
|
*
|
|
* @protected
|
|
*/
|
|
init() {
|
|
if (!~this.opts.transports.indexOf("websocket"))
|
|
return;
|
|
if (this.ws)
|
|
this.ws.close();
|
|
this.ws = new this.opts.wsEngine({
|
|
noServer: true,
|
|
clientTracking: false,
|
|
perMessageDeflate: this.opts.perMessageDeflate,
|
|
maxPayload: this.opts.maxHttpBufferSize,
|
|
});
|
|
if (typeof this.ws.on === "function") {
|
|
this.ws.on("headers", (headersArray, req) => {
|
|
// note: 'ws' uses an array of headers, while Engine.IO uses an object (response.writeHead() accepts both formats)
|
|
// we could also try to parse the array and then sync the values, but that will be error-prone
|
|
const additionalHeaders = req[kResponseHeaders] || {};
|
|
delete req[kResponseHeaders];
|
|
const isInitialRequest = !req._query.sid;
|
|
if (isInitialRequest) {
|
|
this.emit("initial_headers", additionalHeaders, req);
|
|
}
|
|
this.emit("headers", additionalHeaders, req);
|
|
debug("writing headers: %j", additionalHeaders);
|
|
Object.keys(additionalHeaders).forEach((key) => {
|
|
headersArray.push(`${key}: ${additionalHeaders[key]}`);
|
|
});
|
|
});
|
|
}
|
|
}
|
|
cleanup() {
|
|
if (this.ws) {
|
|
debug("closing webSocketServer");
|
|
this.ws.close();
|
|
// don't delete this.ws because it can be used again if the http server starts listening again
|
|
}
|
|
}
|
|
/**
|
|
* Prepares a request by processing the query string.
|
|
*
|
|
* @private
|
|
*/
|
|
prepare(req) {
|
|
// try to leverage pre-existing `req._query` (e.g: from connect)
|
|
if (!req._query) {
|
|
req._query = (~req.url.indexOf("?") ? qs.parse((0, url_1.parse)(req.url).query) : {});
|
|
}
|
|
}
|
|
createTransport(transportName, req) {
|
|
return new transports_1.default[transportName](req);
|
|
}
|
|
/**
|
|
* Handles an Engine.IO HTTP request.
|
|
*
|
|
* @param {EngineRequest} req
|
|
* @param {ServerResponse} res
|
|
*/
|
|
handleRequest(req, res) {
|
|
debug('handling "%s" http request "%s"', req.method, req.url);
|
|
this.prepare(req);
|
|
req.res = res;
|
|
const callback = (errorCode, errorContext) => {
|
|
if (errorCode !== undefined) {
|
|
this.emit("connection_error", {
|
|
req,
|
|
code: errorCode,
|
|
message: Server.errorMessages[errorCode],
|
|
context: errorContext,
|
|
});
|
|
abortRequest(res, errorCode, errorContext);
|
|
return;
|
|
}
|
|
if (req._query.sid) {
|
|
debug("setting new request for existing client");
|
|
this.clients[req._query.sid].transport.onRequest(req);
|
|
}
|
|
else {
|
|
const closeConnection = (errorCode, errorContext) => abortRequest(res, errorCode, errorContext);
|
|
this.handshake(req._query.transport, req, closeConnection);
|
|
}
|
|
};
|
|
this._applyMiddlewares(req, res, (err) => {
|
|
if (err) {
|
|
callback(Server.errors.BAD_REQUEST, { name: "MIDDLEWARE_FAILURE" });
|
|
}
|
|
else {
|
|
this.verify(req, false, callback);
|
|
}
|
|
});
|
|
}
|
|
/**
|
|
* Handles an Engine.IO HTTP Upgrade.
|
|
*/
|
|
handleUpgrade(req, socket, upgradeHead) {
|
|
this.prepare(req);
|
|
const res = new WebSocketResponse(req, socket);
|
|
const callback = (errorCode, errorContext) => {
|
|
if (errorCode !== undefined) {
|
|
this.emit("connection_error", {
|
|
req,
|
|
code: errorCode,
|
|
message: Server.errorMessages[errorCode],
|
|
context: errorContext,
|
|
});
|
|
abortUpgrade(socket, errorCode, errorContext);
|
|
return;
|
|
}
|
|
const head = Buffer.from(upgradeHead);
|
|
upgradeHead = null;
|
|
// some middlewares (like express-session) wait for the writeHead() call to flush their headers
|
|
// see https://github.com/expressjs/session/blob/1010fadc2f071ddf2add94235d72224cf65159c6/index.js#L220-L244
|
|
res.writeHead();
|
|
// delegate to ws
|
|
this.ws.handleUpgrade(req, socket, head, (websocket) => {
|
|
this.onWebSocket(req, socket, websocket);
|
|
});
|
|
};
|
|
this._applyMiddlewares(req, res, (err) => {
|
|
if (err) {
|
|
callback(Server.errors.BAD_REQUEST, { name: "MIDDLEWARE_FAILURE" });
|
|
}
|
|
else {
|
|
this.verify(req, true, callback);
|
|
}
|
|
});
|
|
}
|
|
/**
|
|
* Called upon a ws.io connection.
|
|
*
|
|
* @param {ws.Socket} websocket
|
|
* @private
|
|
*/
|
|
onWebSocket(req, socket, websocket) {
|
|
websocket.on("error", onUpgradeError);
|
|
if (transports_1.default[req._query.transport] !== undefined &&
|
|
!transports_1.default[req._query.transport].prototype.handlesUpgrades) {
|
|
debug("transport doesnt handle upgraded requests");
|
|
websocket.close();
|
|
return;
|
|
}
|
|
// get client id
|
|
const id = req._query.sid;
|
|
// keep a reference to the ws.Socket
|
|
req.websocket = websocket;
|
|
if (id) {
|
|
const client = this.clients[id];
|
|
if (!client) {
|
|
debug("upgrade attempt for closed client");
|
|
websocket.close();
|
|
}
|
|
else if (client.upgrading) {
|
|
debug("transport has already been trying to upgrade");
|
|
websocket.close();
|
|
}
|
|
else if (client.upgraded) {
|
|
debug("transport had already been upgraded");
|
|
websocket.close();
|
|
}
|
|
else {
|
|
debug("upgrading existing transport");
|
|
// transport error handling takes over
|
|
websocket.removeListener("error", onUpgradeError);
|
|
const transport = this.createTransport(req._query.transport, req);
|
|
transport.perMessageDeflate = this.opts.perMessageDeflate;
|
|
client._maybeUpgrade(transport);
|
|
}
|
|
}
|
|
else {
|
|
const closeConnection = (errorCode, errorContext) => abortUpgrade(socket, errorCode, errorContext);
|
|
this.handshake(req._query.transport, req, closeConnection);
|
|
}
|
|
function onUpgradeError() {
|
|
debug("websocket error before upgrade");
|
|
// websocket.close() not needed
|
|
}
|
|
}
|
|
/**
|
|
* Captures upgrade requests for a http.Server.
|
|
*
|
|
* @param {http.Server} server
|
|
* @param {Object} options
|
|
*/
|
|
attach(server, options = {}) {
|
|
const path = this._computePath(options);
|
|
const destroyUpgradeTimeout = options.destroyUpgradeTimeout || 1000;
|
|
function check(req) {
|
|
// TODO use `path === new URL(...).pathname` in the next major release (ref: https://nodejs.org/api/url.html)
|
|
return path === req.url.slice(0, path.length);
|
|
}
|
|
// cache and clean up listeners
|
|
const listeners = server.listeners("request").slice(0);
|
|
server.removeAllListeners("request");
|
|
server.on("close", this.close.bind(this));
|
|
server.on("listening", this.init.bind(this));
|
|
// add request handler
|
|
server.on("request", (req, res) => {
|
|
if (check(req)) {
|
|
debug('intercepting request for path "%s"', path);
|
|
this.handleRequest(req, res);
|
|
}
|
|
else {
|
|
let i = 0;
|
|
const l = listeners.length;
|
|
for (; i < l; i++) {
|
|
listeners[i].call(server, req, res);
|
|
}
|
|
}
|
|
});
|
|
if (~this.opts.transports.indexOf("websocket")) {
|
|
server.on("upgrade", (req, socket, head) => {
|
|
if (check(req)) {
|
|
this.handleUpgrade(req, socket, head);
|
|
}
|
|
else if (false !== options.destroyUpgrade) {
|
|
// default node behavior is to disconnect when no handlers
|
|
// but by adding a handler, we prevent that
|
|
// and if no eio thing handles the upgrade
|
|
// then the socket needs to die!
|
|
setTimeout(function () {
|
|
// @ts-ignore
|
|
if (socket.writable && socket.bytesWritten <= 0) {
|
|
socket.on("error", (e) => {
|
|
debug("error while destroying upgrade: %s", e.message);
|
|
});
|
|
return socket.end();
|
|
}
|
|
}, destroyUpgradeTimeout);
|
|
}
|
|
});
|
|
}
|
|
}
|
|
}
|
|
exports.Server = Server;
|
|
/**
|
|
* Close the HTTP long-polling request
|
|
*
|
|
* @param res - the response object
|
|
* @param errorCode - the error code
|
|
* @param errorContext - additional error context
|
|
*
|
|
* @private
|
|
*/
|
|
function abortRequest(res, errorCode, errorContext) {
|
|
const statusCode = errorCode === Server.errors.FORBIDDEN ? 403 : 400;
|
|
const message = errorContext && errorContext.message
|
|
? errorContext.message
|
|
: Server.errorMessages[errorCode];
|
|
res.writeHead(statusCode, { "Content-Type": "application/json" });
|
|
res.end(JSON.stringify({
|
|
code: errorCode,
|
|
message,
|
|
}));
|
|
}
|
|
/**
|
|
* Close the WebSocket connection
|
|
*
|
|
* @param {net.Socket} socket
|
|
* @param {string} errorCode - the error code
|
|
* @param {object} errorContext - additional error context
|
|
*/
|
|
function abortUpgrade(socket, errorCode, errorContext = {}) {
|
|
socket.on("error", () => {
|
|
debug("ignoring error from closed connection");
|
|
});
|
|
if (socket.writable) {
|
|
const message = errorContext.message || Server.errorMessages[errorCode];
|
|
const length = Buffer.byteLength(message);
|
|
socket.write("HTTP/1.1 400 Bad Request\r\n" +
|
|
"Connection: close\r\n" +
|
|
"Content-type: text/html\r\n" +
|
|
"Content-Length: " +
|
|
length +
|
|
"\r\n" +
|
|
"\r\n" +
|
|
message);
|
|
}
|
|
socket.destroy();
|
|
}
|
|
/* eslint-disable */
|
|
/**
|
|
* From https://github.com/nodejs/node/blob/v8.4.0/lib/_http_common.js#L303-L354
|
|
*
|
|
* True if val contains an invalid field-vchar
|
|
* field-value = *( field-content / obs-fold )
|
|
* field-content = field-vchar [ 1*( SP / HTAB ) field-vchar ]
|
|
* field-vchar = VCHAR / obs-text
|
|
*
|
|
* checkInvalidHeaderChar() is currently designed to be inlinable by v8,
|
|
* so take care when making changes to the implementation so that the source
|
|
* code size does not exceed v8's default max_inlined_source_size setting.
|
|
**/
|
|
// prettier-ignore
|
|
const validHdrChars = [
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, // 0 - 15
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 16 - 31
|
|
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 32 - 47
|
|
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 48 - 63
|
|
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 64 - 79
|
|
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 80 - 95
|
|
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 96 - 111
|
|
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, // 112 - 127
|
|
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, // 128 ...
|
|
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
|
|
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
|
|
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
|
|
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
|
|
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
|
|
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
|
|
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 // ... 255
|
|
];
|
|
function checkInvalidHeaderChar(val) {
|
|
val += "";
|
|
if (val.length < 1)
|
|
return false;
|
|
if (!validHdrChars[val.charCodeAt(0)]) {
|
|
debug('invalid header, index 0, char "%s"', val.charCodeAt(0));
|
|
return true;
|
|
}
|
|
if (val.length < 2)
|
|
return false;
|
|
if (!validHdrChars[val.charCodeAt(1)]) {
|
|
debug('invalid header, index 1, char "%s"', val.charCodeAt(1));
|
|
return true;
|
|
}
|
|
if (val.length < 3)
|
|
return false;
|
|
if (!validHdrChars[val.charCodeAt(2)]) {
|
|
debug('invalid header, index 2, char "%s"', val.charCodeAt(2));
|
|
return true;
|
|
}
|
|
if (val.length < 4)
|
|
return false;
|
|
if (!validHdrChars[val.charCodeAt(3)]) {
|
|
debug('invalid header, index 3, char "%s"', val.charCodeAt(3));
|
|
return true;
|
|
}
|
|
for (let i = 4; i < val.length; ++i) {
|
|
if (!validHdrChars[val.charCodeAt(i)]) {
|
|
debug('invalid header, index "%i", char "%s"', i, val.charCodeAt(i));
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|