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/*
* SockJS is a browser JavaScript library that provides a WebSocket-like object.
* SockJS gives you a coherent, cross-browser, Javascript API which creates a low latency,
* full duplex, cross-domain communication channel between the browser and the web server.
*
* Copyright (c) 2011-2018 The sockjs-client Authors.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of the library source tree.
*
*/
"use strict";
function parseSockJS(msg) {
const type = msg.slice(0, 1);
const content = msg.slice(1);
// first check for messages that don't need a payload
switch (type) {
case "o":
return { type: "open" };
case "h":
return { type: "heartbeat" };
}
let payload;
if (content) {
try {
payload = JSON.parse(content);
} catch (e) {
return null;
}
}
if (typeof payload === "undefined") {
return null;
}
switch (type) {
case "a":
return { type: "message", data: payload };
case "m":
return { type: "message", data: payload };
case "c":
const [code, message] = payload;
return { type: "close", code, message };
default:
return null;
}
}
module.exports = {
parseSockJS,
};