3 Object.defineProperty(exports, "__esModule", {
6 exports.default = expressWs;
8 var _http = require('http');
10 var _http2 = _interopRequireDefault(_http);
12 var _express = require('express');
14 var _express2 = _interopRequireDefault(_express);
16 var _ws = require('ws');
18 var _ws2 = _interopRequireDefault(_ws);
20 var _websocketUrl = require('./websocket-url');
22 var _websocketUrl2 = _interopRequireDefault(_websocketUrl);
24 var _addWsMethod = require('./add-ws-method');
26 var _addWsMethod2 = _interopRequireDefault(_addWsMethod);
28 function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
30 function expressWs(app, httpServer) {
31 var options = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {};
33 var server = httpServer;
35 if (server === null || server === undefined) {
36 /* No HTTP server was explicitly provided, create one for our Express application. */
37 server = _http2.default.createServer(app);
39 app.listen = function serverListen() {
42 return (_server = server).listen.apply(_server, arguments);
46 /* Make our custom `.ws` method available directly on the Express application. You should
47 * really be using Routers, though. */
48 (0, _addWsMethod2.default)(app);
50 /* Monkeypatch our custom `.ws` method into Express' Router prototype. This makes it possible,
51 * when using the standard Express Router, to use the `.ws` method without any further calls
52 * to `makeRouter`. When using a custom router, the use of `makeRouter` may still be necessary.
54 * This approach works, because Express does a strange mixin hack - the Router factory
55 * function is simultaneously the prototype that gets assigned to the resulting Router
57 if (!options.leaveRouterUntouched) {
58 (0, _addWsMethod2.default)(_express2.default.Router);
61 // allow caller to pass in options to WebSocketServer constructor
62 var wsOptions = options.wsOptions || {};
63 wsOptions.server = server;
64 var wsServer = new _ws2.default.Server(wsOptions);
66 wsServer.on('connection', function (socket, request) {
67 if ('upgradeReq' in socket) {
68 request = socket.upgradeReq;
72 request.wsHandled = false;
74 /* By setting this fake `.url` on the request, we ensure that it will end up in the fake
75 * `.get` handler that we defined above - where the wrapper will then unpack the `.ws`
76 * property, indicate that the WebSocket has been handled, and call the actual handler. */
77 request.url = (0, _websocketUrl2.default)(request.url);
79 var dummyResponse = new _http2.default.ServerResponse(request);
81 dummyResponse.writeHead = function writeHead(statusCode) {
82 if (statusCode > 200) {
83 /* Something in the middleware chain signalled an error. */
84 dummyResponse._header = '';
89 app.handle(request, dummyResponse, function () {
90 if (!request.wsHandled) {
91 /* There was no matching WebSocket-specific route for this request. We'll close
92 * the connection, as no endpoint was able to handle the request anyway... */
100 getWss: function getWss() {
103 applyTo: function applyTo(router) {
104 (0, _addWsMethod2.default)(router);
107 } /* This module does a lot of monkeypatching, but unfortunately that appears to be the only way to
108 * accomplish this kind of stuff in Express.
110 * Here be dragons. */