[fix] Make read-only properties read-only

Fixes #1814

Author: lpinca

lib/websocket-server.js

@@ -299,7 +299,7 @@ class WebSocketServer extends EventEmitter {
 
       if (protocol) {
         headers.push(`Sec-WebSocket-Protocol: ${protocol}`);
-        ws.protocol = protocol;
+        ws._protocol = protocol;
       }
     }
 

lib/websocket.js

@@ -43,16 +43,15 @@ class WebSocket extends EventEmitter {
   constructor(address, protocols, options) {
     super();
 
-    this.readyState = WebSocket.CONNECTING;
-    this.protocol = '';
-
     this._binaryType = BINARY_TYPES[0];
+    this._closeCode = 1006;
     this._closeFrameReceived = false;
     this._closeFrameSent = false;
     this._closeMessage = '';
     this._closeTimer = null;
-    this._closeCode = 1006;
     this._extensions = {};
+    this._protocol = '';
+    this._readyState = WebSocket.CONNECTING;
     this._receiver = null;
     this._sender = null;
     this._socket = null;
@@ -126,6 +125,27 @@ class WebSocket extends EventEmitter {
     return Object.keys(this._extensions).join();
   }
 
+  /**
+   * @type {String}
+   */
+  get protocol() {
+    return this._protocol;
+  }
+
+  /**
+   * @type {Number}
+   */
+  get readyState() {
+    return this._readyState;
+  }
+
+  /**
+   * @type {String}
+   */
+  get url() {
+    return this._url;
+  }
+
   /**
    * Set up the socket and the internal resources.
    *
@@ -166,7 +186,7 @@ class WebSocket extends EventEmitter {
     socket.on('end', socketOnEnd);
     socket.on('error', socketOnError);
 
-    this.readyState = WebSocket.OPEN;
+    this._readyState = WebSocket.OPEN;
     this.emit('open');
   }
 
@@ -177,7 +197,7 @@ class WebSocket extends EventEmitter {
    */
   emitClose() {
     if (!this._socket) {
-      this.readyState = WebSocket.CLOSED;
+      this._readyState = WebSocket.CLOSED;
       this.emit('close', this._closeCode, this._closeMessage);
       return;
     }
@@ -187,7 +207,7 @@ class WebSocket extends EventEmitter {
     }
 
     this._receiver.removeAllListeners();
-    this.readyState = WebSocket.CLOSED;
+    this._readyState = WebSocket.CLOSED;
     this.emit('close', this._closeCode, this._closeMessage);
   }
 
@@ -222,7 +242,7 @@ class WebSocket extends EventEmitter {
       return;
     }
 
-    this.readyState = WebSocket.CLOSING;
+    this._readyState = WebSocket.CLOSING;
     this._sender.close(code, data, !this._isServer, (err) => {
       //
       // This error is handled by the `'error'` listener on the socket. We only
@@ -367,14 +387,17 @@ class WebSocket extends EventEmitter {
     }
 
     if (this._socket) {
-      this.readyState = WebSocket.CLOSING;
+      this._readyState = WebSocket.CLOSING;
       this._socket.destroy();
     }
   }
 }
 
 readyStates.forEach((readyState, i) => {
-  WebSocket[readyState] = i;
+  Object.defineProperty(WebSocket, readyState, {
+    enumerable: true,
+    value: i
+  });
 });
 
 //
@@ -474,10 +497,10 @@ function initAsClient(websocket, address, protocols, options) {
 
   if (address instanceof URL) {
     parsedUrl = address;
-    websocket.url = address.href;
+    websocket._url = address.href;
   } else {
     parsedUrl = new URL(address);
-    websocket.url = address;
+    websocket._url = address;
   }
 
   const isUnixSocket = parsedUrl.protocol === 'ws+unix:';
@@ -552,7 +575,7 @@ function initAsClient(websocket, address, protocols, options) {
     if (websocket._req.aborted) return;
 
     req = websocket._req = null;
-    websocket.readyState = WebSocket.CLOSING;
+    websocket._readyState = WebSocket.CLOSING;
     websocket.emit('error', err);
     websocket.emitClose();
   });
@@ -623,7 +646,7 @@ function initAsClient(websocket, address, protocols, options) {
       return;
     }
 
-    if (serverProt) websocket.protocol = serverProt;
+    if (serverProt) websocket._protocol = serverProt;
 
     if (perMessageDeflate) {
       try {
@@ -688,7 +711,7 @@ function tlsConnect(options) {
  * @private
  */
 function abortHandshake(websocket, stream, message) {
-  websocket.readyState = WebSocket.CLOSING;
+  websocket._readyState = WebSocket.CLOSING;
 
   const err = new Error(message);
   Error.captureStackTrace(err, abortHandshake);
@@ -777,7 +800,7 @@ function receiverOnError(err) {
 
   websocket._socket.removeListener('data', socketOnData);
 
-  websocket.readyState = WebSocket.CLOSING;
+  websocket._readyState = WebSocket.CLOSING;
   websocket._closeCode = err[kStatusCode];
   websocket.emit('error', err);
   websocket._socket.destroy();
@@ -836,7 +859,7 @@ function socketOnClose() {
   this.removeListener('close', socketOnClose);
   this.removeListener('end', socketOnEnd);
 
-  websocket.readyState = WebSocket.CLOSING;
+  websocket._readyState = WebSocket.CLOSING;
 
   //
   // The close frame might not have been received or the `'end'` event emitted,
@@ -887,7 +910,7 @@ function socketOnData(chunk) {
 function socketOnEnd() {
   const websocket = this[kWebSocket];
 
-  websocket.readyState = WebSocket.CLOSING;
+  websocket._readyState = WebSocket.CLOSING;
   websocket._receiver.end();
   this.end();
 }
@@ -904,7 +927,7 @@ function socketOnError() {
   this.on('error', NOOP);
 
   if (websocket) {
-    websocket.readyState = WebSocket.CLOSING;
+    websocket._readyState = WebSocket.CLOSING;
     this.destroy();
   }
 }