Add voice websocket handling

src/client/voice/VoiceConnectionWebSocket.js

@@ -0,0 +1,57 @@
+const WebSocket = require('ws');
+const Constants = require('../../util/Constants');
+const EventEmitter = require('events').EventEmitter;
+
+class VoiceConnectionWebSocket extends EventEmitter {
+  constructor(voiceConnection, serverID, token, sessionID, endpoint) {
+    super();
+    this.voiceConnection = voiceConnection;
+    this.token = token;
+    this.sessionID = sessionID;
+    this.serverID = serverID;
+    this.ws = new WebSocket(`wss://${endpoint}`, null, { rejectUnauthorized: false });
+    this.ws.onopen = () => this._onOpen();
+    this.ws.onmessage = e => this._onMessage(e);
+  }
+
+  send(data) {
+    if (this.ws.readyState === WebSocket.OPEN) {
+      this.ws.send(JSON.stringify(data));
+    }
+  }
+
+  _onOpen() {
+    this.send({
+      op: Constants.OPCodes.DISPATCH,
+      d: {
+        server_id: this.serverID,
+        user_id: this.voiceConnection.manager.client.user.id,
+        session_id: this.sessionID,
+        token: this.token,
+      },
+    });
+  }
+
+  _onError(e) {
+    throw e;
+  }
+
+  _onMessage(event) {
+    let packet;
+    try {
+      packet = JSON.parse(event.data);
+    } catch (error) {
+      return this._onError(error);
+    }
+
+    switch (packet.op) {
+      case 2:
+        this.emit('ready-for-udp', packet.d);
+        break;
+      default:
+        break;
+    }
+  }
+}
+
+module.exports = VoiceConnectionWebSocket;