decentralized-video-chat/server.js
2020-06-04 15:41:28 +08:00

145 lines
4.3 KiB
JavaScript

require("dotenv").config();
var sslRedirect = require("heroku-ssl-redirect");
// Get twillio auth and SID from heroku if deployed, else get from local .env file
var twillioAuthToken =
process.env.HEROKU_AUTH_TOKEN || process.env.LOCAL_AUTH_TOKEN;
var twillioAccountSID =
process.env.HEROKU_TWILLIO_SID || process.env.LOCAL_TWILLIO_SID;
var twilio = require("twilio")(twillioAccountSID, twillioAuthToken);
var express = require("express");
var app = express();
const fs = require('fs');
var http = require("http").createServer(app);
var io = require("socket.io")(http);
var path = require("path");
var public = path.join(__dirname, "public");
const url = require("url");
// enable ssl redirect
app.use(sslRedirect());
// Remove trailing slashes in url
app.use(function (req, res, next) {
if (req.path.substr(-1) === "/" && req.path.length > 1) {
let query = req.url.slice(req.path.length);
res.redirect(301, req.path.slice(0, -1) + query);
} else {
next();
}
});
app.get("/", function (req, res) {
res.sendFile(path.join(public, "landing.html"));
});
app.get("/newcall", function (req, res) {
res.sendFile(path.join(public, "newcall.html"));
});
app.get("/join/", function (req, res) {
res.redirect("/");
});
app.get("/join/*", function (req, res) {
if (Object.keys(req.query).length > 0) {
logIt("redirect:" + req.url + " to " + url.parse(req.url).pathname);
res.redirect(url.parse(req.url).pathname);
} else {
res.sendFile(path.join(public, "chat.html"));
}
});
app.get("/notsupported", function (req, res) {
res.sendFile(path.join(public, "notsupported.html"));
});
app.get("/notsupportedios", function (req, res) {
res.sendFile(path.join(public, "notsupportedios.html"));
});
// Serve static files in the public directory
app.use(express.static("public"));
// Simple logging function to add room name
function logIt(msg, room) {
if (room) {
console.log(room + ": " + msg);
} else {
console.log(msg);
}
}
// When a socket connects, set up the specific listeners we will use.
io.on("connection", function (socket) {
// When a client tries to join a room, only allow them if they are first or
// second in the room. Otherwise it is full.
socket.on("join", function (room) {
logIt("A client joined the room", room);
var clients = io.sockets.adapter.rooms[room];
var numClients = typeof clients !== "undefined" ? clients.length : 0;
if (numClients === 0) {
socket.join(room);
} else if (numClients < 5) {
socket.join(room);
logIt("Broadcasting request to connect with new peer...", room);
// Emits message to ask peers in room to connect with joining peer
socket.broadcast.to(room).emit("initiateCall", socket.id, room);
} else {
logIt(
"room already full with " + numClients + " people in the room.",
room
);
socket.emit("full", room);
}
});
socket.on("leave", function (room) {
logIt("A client has left the room", room);
socket.broadcast.to(room).emit("leave", socket.id);
});
// When receiving the token message, use the Twilio REST API to request an
// token to get ephemeral credentials to use the TURN server.
socket.on("token", function (room, uuid) {
logIt("Received token request", room);
twilio.tokens.create(function (err, response) {
if (err) {
logIt(err, room);
} else {
logIt("Token generated. Returning it to the browser client", room);
socket.emit("token", response, uuid);
}
});
});
// Relay candidate messages
socket.on("candidate", function (candidate, room, uuid) {
logIt("Received candidate. Broadcasting...", room);
io.to(uuid).emit("candidate", candidate, socket.id);
});
// Relay offers
socket.on("offer", function (offer, room, uuid) {
logIt(
"Received offer from " + socket.id + " and emitting to " + uuid,
room
);
io.to(uuid).emit("offer", offer, socket.id);
});
// Relay answers
socket.on("answer", function (answer, room, uuid) {
logIt(
"Received answer from " + socket.id + " and emitting to " + uuid,
room
);
io.to(uuid).emit("answer", answer, socket.id);
});
});
// Listen for Heroku port, otherwise just use 3000
var port = process.env.PORT || 443;
http.listen(port, function () {
console.log("http://localhost:" + port);
});