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server.js
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var express = require('express');
var app = express();
var mongojs = require('mongojs');
var db = mongojs('mongodb://heroku_2hcp9k8k:19uocjcgsn6ce4pp7j66fe1ras@ds119020.mlab.com:19020/heroku_2hcp9k8k', ['roomsQuestionsCollection', 'roomsCollection', 'counter']);
var bodyParser = require('body-parser');
var path = require('path');
var schedule = require('node-schedule');
app.use(express.static(__dirname));
app.use(bodyParser.json());
/* SOCKET IO */
var http = require('http').Server(app);
var io = require('socket.io')(http);
var userCount = 0;
// Used when cycling through cookie-clicks to send the appropriate socket messages
var clickList = ['cantKeepUp', 'decreaseVolume', 'increaseVolume', 'decreaseSpeed', 'increaseSpeed'];
// socket functions
io.on('connection', function (socket) {
console.log('User ' + socket.id + ' connected.' + userCount);
var currentRoomID;
var currentCookie;
socket.on('cookie initialize', function (cookie) {
socket.handshake.headers.cookie = cookie; //sets the socket header to the cookie
currentCookie = cookie;
});
socket.on('disconnect', function () {// 11111 , cku, decVol, incVol, decSpeed, incSpeed
console.log("USER IS DISCONNECTING!!! Socket header cookie is : ", socket.handshake.headers.cookie);
if (socket.handshake.headers.cookie == undefined) { //If the cookie is not set in the socket-header, should not happen
console.log("User's header cookie was undefined");
io.to(currentRoomID).emit('storeClient', -1);
db.counter.update({room: currentRoomID}, {$inc: {userCount: -1}});
return false;
} else {
var clicks = cookieParseCounter(socket.handshake.headers.cookie);
console.log("Clicks are:", clicks);
var moddedClicks = []; // This is used so that we can update the database accordingly
var modified = false; // Tells us if the cookie has been altered
for (var i = 0; i < 5; ++i) {//trying to remove the clicks the user has done
if (clicks[i] == 0) { //looping through the user's cookie
io.to(currentRoomID).emit(clickList[i], -1); //emitting the appropriate message to the lecturer view of the user's room
moddedClicks.push(-1);
modified = true;
} else {
moddedClicks.push(0);
}
}
if (modified) { // If the cookie has been modified
//database updates to restore the changes the user has done
console.log("Disconnect: Modified, clicks = ", moddedClicks);
db.counter.update({room: currentRoomID}, {
$inc: {
cantKeepUp: moddedClicks[0],
decreaseVolume: moddedClicks[1],
increaseVolume: moddedClicks[2],
decreaseSpeed: moddedClicks[3],
increaseSpeed: moddedClicks[4],
userCount: -1
}
});
} else {
db.counter.update({room: currentRoomID}, {$inc: {userCount: -1}});
}
socket.leave(currentRoomID);
io.to(currentRoomID).emit('storeClient', -1);
return false;
}
});
socket.on('leave room', function (cookie) {
var clicks = cookie.substring(0, 5); // We remove everything but the clicks, first five
console.log("User leaving, clicks are : ", clicks);
var moddedClicks = [];
var modified = false;
for (var i = 0; i < 5; ++i) {//trying to remove the clicks the user has done
if (clicks[i] == 0) { //looping through the user's cookie
io.to(currentRoomID).emit(clickList[i], -1); //emitting the appropriate message to the lecturer view of the user's room
moddedClicks.push(-1); //this is used so that we can update the database accordingly
modified = true;
} else {
moddedClicks.push(0);
}
}
if (modified) {
//database updates to restore the changes the user has done
db.counter.update({room: currentRoomID}, {
$inc: {
cantKeepUp: moddedClicks[0],
decreaseVolume: moddedClicks[1],
increaseVolume: moddedClicks[2],
decreaseSpeed: moddedClicks[3],
increaseSpeed: moddedClicks[4],
userCount: -1
}
});
} else {
db.counter.update({room: currentRoomID}, {$inc: {userCount: -1}});
}
socket.leave(currentRoomID);
io.to(currentRoomID).emit('storeClient', -1);
currentRoomID = "";
});
socket.on('join room', function (roomName, cookie) {
//Checks if the user is already connected to the room socket
if (socket.rooms[roomName]) {
console.log("User already connected to room");
return false;
} else { // We connect the user and checks their cookie to see if we need to increment some counters
socket.join(roomName);
console.log("socket.rooms after, ", cookie);
currentRoomID = roomName;
io.to(roomName).emit('storeClient', 1);
if (cookie != undefined) { //Checks if we're sending the cookie or not
var modified = false;
var moddedClicks = [];
for (var i = 0; i < 5; ++i) {//trying to remove the clicks the user has done
if (cookie[i] == 0) { //looping through the user's cookie
io.to(currentRoomID).emit(clickList[i], 1); //emitting the appropriate message to the lecturer view of the user's room
moddedClicks.push(1); //this is used so that we can update the database accordingly
modified = true; //Makes us update the database
} else {
moddedClicks.push(0);
}
}
if (modified) {//trying not to pester the DB needlessly
console.log("JR: Modified, modded clicks: ", moddedClicks);
db.counter.update({room: currentRoomID}, {
$inc: {
cantKeepUp: moddedClicks[0],
decreaseVolume: moddedClicks[1],
increaseVolume: moddedClicks[2],
decreaseSpeed: moddedClicks[3],
increaseSpeed: moddedClicks[4],
userCount: 1
}
});
} else {
console.log("Join Room 'else'-statement");
db.counter.update({room: currentRoomID}, {$inc: {userCount: 1}});
}
}
}
}
);
socket.on('join room lecturer', function (roomName) {
socket.join(roomName);
});
socket.on('leave room lecturer', function (roomName) {
console.log("Lecturer leaving room: ", roomName);
socket.leave(roomName);
});
socket.on('new room message', function (msg, userId) {
var rString = randomString(24, '0123456789abcdef');
console.log("Trying to save room: " + msg + " user: " + userId);
var currentdate = new Date();
var expirydate = (currentdate.getDate()+1) + "/"
+ (currentdate.getMonth() + 1) + "/"
+ currentdate.getFullYear() + "@"
+ currentdate.getHours() + ":"
+ currentdate.getMinutes();
db.roomsCollection.insert({
_id: mongojs.ObjectID(rString),
room: msg,
creator: userId,
expire: expirydate
}, function (err, o) {
if (err) {
console.warn(err.message);
}
else {
console.log("Room inserted into the db: " + msg + "by user: " + userId);
}
});
//Create counters for the new room, unspecified ID, we use roomname to retrieve
var clickCounterDocument = [{
room: msg, "cantKeepUp": 0, "decreaseVolume": 0, "increaseVolume": 0,
"decreaseSpeed": 0, "increaseSpeed": 0, "userCount": 0
}];
db.counter.insert(clickCounterDocument, function (err, o) {
if (err) {
console.warn(err.message);
}
else {
console.log("Click counters for " + msg + " inserted into the db: by user: " + userId);
}
});
//Sends the new room to all users on the front-page
io.emit('new room broadcast', {_id: mongojs.ObjectID(rString), room: msg, creator: userId});
});
socket.on('room delete', function (index, obj, userId) {
//retrieve the room
console.log("A room is being deleted");
db.roomsCollection.find({_id: mongojs.ObjectId(obj._id)}, function (err, docs) {
//check if the room's creator is the same as the one trying to delete it
if (docs[0].creator === obj.creator) {
console.log("Server received 'room delete' message for id: " + obj.room + " and userId: " + userId);
//deletes the selected room and its counter from the database
db.roomsCollection.remove({_id: mongojs.ObjectId(obj._id)});
db.counter.remove({room: obj.room});
db.roomsQuestionsCollection.remove({room: obj.room});
io.emit('delete room broadcast', index, obj.room);
io.to(obj.room).emit('delete current room');
}
});
});
// server receives a new message and sends it to the python script
socket.on('question message', function (msg, roomName) {
console.log('roomname: ' + roomName);
var rString = randomString(24, '0123456789abcdef');
io.emit('pp message', {_id: mongojs.ObjectID(rString), room: roomName, text: msg, tag: ""});
});
//server receives processed message from the python script and sends it to all users in the room
socket.on('processed message', function (obj) {
console.log('message: ' + obj.text);
//inserting new message into mlab database
db.roomsQuestionsCollection.insert({
_id: mongojs.ObjectID(obj._id),
room: String(obj.room),
text: obj.text,
tag: obj.tag
}, function (err, o) {
if (err) {
console.warn(err.message);
}
else {
console.log("question message inserted into the db: " + obj.text);
}
});
// broadcasts question message to all listening sockets with the same object we insert into the database
io.to(obj.room).emit('question message', {
_id: mongojs.ObjectID(obj._id),
room: String(obj.room),
text: obj.text,
tag: obj.tag
});
});
//menu buttons, updating socket header for each click
socket.on('cantKeepUp', function (inc, room, cookie) {
db.counter.update({room: room}, {$inc: {cantKeepUp: inc}});
socket.handshake.headers.cookie = cookie;
io.to(room).emit('cantKeepUp', inc);
});
socket.on('decreaseVolume', function (inc, room, cookie) {
db.counter.update({room: room}, {$inc: {decreaseVolume: inc}});
socket.handshake.headers.cookie = cookie;
io.to(room).emit('decreaseVolume', inc, userCount);
});
socket.on('increaseVolume', function (inc, room, cookie) {
db.counter.update({room: room}, {$inc: {increaseVolume: inc}});
socket.handshake.headers.cookie = cookie;
io.to(room).emit('increaseVolume', inc, userCount);
});
socket.on('decreaseSpeed', function (inc, room, cookie) {
db.counter.update({room: room}, {$inc: {decreaseSpeed: inc}});
socket.handshake.headers.cookie = cookie;
io.to(room).emit('decreaseSpeed', inc, userCount);
});
socket.on('increaseSpeed', function (inc, room, cookie) {
db.counter.update({room: room}, {$inc: {increaseSpeed: inc}});
socket.handshake.headers.cookie = cookie;
io.to(room).emit('increaseSpeed', inc, userCount);
});
socket.on('resetVotes', function (room) {
console.log("Reset votes message received for room, ", room);
db.counter.update({room: room}, {
$set: {
cantKeepUp: 0,
decreaseVolume: 0,
increaseVolume: 0,
decreaseSpeed: 0,
increaseSpeed: 0
}
});
io.to(room).emit('resetVotes');
});
//servers response to emitted message to delete question from lecturer controller
socket.on('question delete', function (index, obj) {
console.log("Server received 'question delete' broadcast for id: " + obj._id);
db.roomsQuestionsCollection.remove({_id: mongojs.ObjectId(obj._id)});
io.emit('question delete', index, obj);
});
//servers response to emitted message to delete question from lecturer controller
socket.on('question delete grouped', function (rowIndex, index, obj) {
console.log("Server received 'question delete' broadcast for id: " + obj._id);
//deletes the selected question from the database
db.roomQuestionsCollection.remove({_id: mongojs.ObjectId(obj._id)});
io.emit('question delete grouped', rowIndex, index, obj);
});
})
;
/* ID Generator */
function randomString(length, chars) {
var result = '';
for (var i = length; i > 0; --i) result += chars[Math.floor(Math.random() * chars.length)];
return result;
}
/* SERVER SIDE ROUTING */
app.get('/lecturer', function (req, res) {
res.sendFile(__dirname + '/index.html');
});
app.get('/student', function (req, res) {
res.sendFile(__dirname + '/index.html');
});
app.get('/questions', function (req, res) {
res.sendFile(__dirname + '/index.html');
});
app.get('/front', function (req, res) {
res.sendFile(__dirname + '/index.html');
});
/* Check for expired rooms */
// Node-schedule running once every hour, 3 minutes past
var roomExpiredCheck = schedule.scheduleJob('03 * * * *', function () {
// Setting the current date and time
var currentdate = new Date();
var datetime = currentdate.getDate() + "/"
+ (currentdate.getMonth() + 1) + "/"
+ currentdate.getFullYear() + "@"
+ currentdate.getHours() + ":"
+ currentdate.getMinutes();
console.log("Scheduled room expired check is running at ", datetime);
// Retrieves the rooms from database
db.roomsCollection.find(function (err, docs) {
if (err) {
console.warn(err.message);
}
else {
// Looping through all the rooms
for (var i = 0; i < docs.length; i++) {
console.log("This room expires at : ", docs[i].expire);
// If the rooms date and time is past the current, then we remove from database and front-end users
if (docs[i].expire < datetime) {
db.roomsCollection.remove({_id: mongojs.ObjectId(docs[i]._id)});
db.counter.remove({room: docs[i].room});
db.roomsQuestionsCollection.remove({room: docs[i].room});
io.emit('delete room broadcast', 0, docs[i].room);
io.to(docs[i].room).emit('delete current room');
}
}
}
});
});
/* DATABASE METHODS */
app.get('/ownerTest', function (req, res) {
console.log("Owner test");
var roomName = cookieParseRoom(req.headers.cookie);
console.log("current room: ", roomName);
var userID = cookieParseUser(req.headers.cookie);
console.log("UserID: ", userID);
if (userID == undefined) {
console.log("User was undefined!!");
return false;
}
db.roomsCollection.find({room: roomName}, function (err, docs) {
if (err) {
console.warn(err.message);
}
else {
if (docs.length == 0) {
console.log("Room was undefined!!");
return false;
}
else if (docs[0].creator === userID) {
res.json(true);
} else {
console.log("Owner test failed returned false");
res.json(false);
}
}
})
});
app.get('/roomsQuestionsCollection', function (req, res) {
console.log("RQ: I received a GET request");
var roomName = cookieParseRoom(req.headers.cookie);
console.log("current room: ", roomName);
db.roomsQuestionsCollection.find({room: roomName}, function (err, docs) {
if (err) {
console.warn(err.message);
}
else {
res.json(docs);
}
});
});
//Which one are we using
app.get('/roomsCollection', function (req, res) {
console.log("R: I received a GET request");
db.roomsCollection.find(function (err, docs) {
if (err) {
console.warn(err.message);
}
else {
//console.log(docs);
res.json(docs);
}
})
});
app.get('/roomsCollection/:id', function (req, res) {
console.log("RID: I received a GET request");
db.roomsCollection.find(function (err, docs) {
if (err) {
console.warn(err.message);
}
else {
//console.log(docs);
res.json(docs);
}
})
});
app.get('/roomsQuestionsCollection/:id', function (req, res) {
var roomName = cookieParseRoom(req.headers.cookie);
console.log("Q: I received a GET request", roomName);
var id = req.params.id;
console.log("Current room: ", roomName);
roomName = roomName.substring(1);
db.roomsQuestionsCollection.findOne({_id: mongojs.ObjectId(id), room: String(roomName)}, function (err, doc) {
res.json(doc);
});
});
app.get('/counters', function (req, res) {
var roomName = cookieParseRoom(req.headers.cookie);
console.log("Q: I received a GET request", roomName);
db.counter.find({room: roomName}, function (err, doc) {
res.json(doc);
})
});
function cookieParseRoom(cookie) {//Removes everything about the cookie which is not about room
console.log("CookieParseRoom running on: ", cookie);
if (cookie.indexOf("io=") == 0) {//checks to see if io is first
cookie = cookie.replace(/io=\s*(.*?)\s*; /, ''); //regex to remove io= .... ;
console.log("Cookie is now: ", cookie);
return cookie.slice(25); //removes key= prefix, the UID and click counters
}
var tempVar = cookie.slice(25); //remove the non-room parts
console.log("This is the processed string: ", tempVar.substring(0, tempVar.indexOf(';')));
return ( tempVar.substring(0, tempVar.indexOf(';'))); //remove the last semicolon
}
function cookieParseUser(cookie) {//Removes everything about the cookie which is not about room
console.log("CookieParseUser running on: ", cookie);
if (cookie.indexOf("io=") == 0) {//checks to see if io is first
cookie = cookie.replace(/io=\s*(.*?)\s*; /, ''); //regex to remove io= .... ;
return cookie.substring(9, 25); //removes the UID and click counters
}
console.log("This is the processed string: ", cookie.substring(9, 25));
return cookie.substring(9, 25); //remove the non-room parts
}
function cookieParseCounter(cookie) {//Removes everything about the cookie which is not about room
console.log("CookieParseCounter running on: ", cookie);
if (cookie.indexOf("io=") == 0) {//checks to see if io is first
cookie = cookie.replace(/io=\s*(.*?)\s*; /, ''); //regex to remove io= .... ;
return cookie.substring(4, 9); //removes the UID and click counters
}
console.log("This is the processed string: ", cookie.substring(4, 9));
return cookie.substring(4, 9); //remove the non-room parts
}
var server = http.listen(process.env.PORT || 3000);
console.log("Server running on port 3000");
module.exports = server;