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server.js
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server.js
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//node modules you'll need
var express = require('express');
var http = require('http');
var bodyParser = require('body-parser');
var anyDB = require('any-db');
var path = require('path');
var app = express();
var server = http.createServer(app);
var io = require('socket.io').listen(server);
var cons = require('consolidate');
var viewPath = __dirname + '/views/html/';
// setup html engine
app.engine('html', cons.swig)
app.set('views', viewPath);
app.set('view engine', 'html');
// allow for parsing post requests
app.use(bodyParser.urlencoded({
extended: true
}));
app.use(bodyParser.json());
app.use(express.static(path.join(__dirname, 'views')));
//global variables
var port = 8080;
var room_map = [];
var conn = anyDB.createConnection('sqlite3://chatroom.db');
var date = new Date();
//listen at localhost 8080!
server.listen(port);
console.log("Started server on port: " + port);
// schema for the table to add which adds if the table doesn't already exist
var messagesSchema = "CREATE TABLE IF NOT EXISTS messages ("
+ "id INTEGER PRIMARY KEY AUTOINCREMENT, "
+ "room TEXT, "
+ "nickname TEXT, "
+ "body TEXT, "
+ "time INTEGER);";
// creates the table in the db
conn.query(messagesSchema)
.on('end', function(e){
});
// get all of the rooms that are active
var sql_query = 'SELECT DISTINCT room FROM messages;';
conn.query(sql_query, function (err, res) {
var rooms = res.rows;
for (r in rooms) {
room_map[rooms[r].room] = true;
}
});
var namespace = '/';
io.sockets.on('connection', function(socket){
// clients emit this when they join new rooms
socket.on('join', function(roomName, nickname, callback){
socket.join(roomName); // this is a socket.io method
socket.nickname = nickname; // yay JavaScript! see below
socket.roomname = roomName;
// all the room members for this room
var roomMembers = getRoomMembers(roomName);
io.sockets.in(roomName).emit('membershipChanged', roomMembers);
// get a list of messages currently in the room, then send it back
var sql_query = 'SELECT * FROM messages WHERE room=$1 ORDER BY time ASC';
conn.query(sql_query, [roomName], function (err, res) {
callback(res);
});
// show that a member has been added to the room
io.sockets.in(roomName).emit('memberAdded', socket.nickname, date.getTime());
});
// this gets emitted if a user changes their nickname
socket.on('nickname', function(roomName, newNickname, oldNickname){
var sql_query = 'UPDATE messages SET nickname = $1 WHERE room=$2 AND nickname=$3;';
conn.query(sql_query, [newNickname, roomName, socket.nickname], function (err, res) {
socket.nickname = newNickname;
// update the room members list
var roomMembers = getRoomMembers(roomName);
io.sockets.in(roomName).emit('membershipChanged', roomMembers);
// refresh the messages list
var sql_query = 'SELECT * FROM messages WHERE room=$1 ORDER BY time ASC';
conn.query(sql_query, [roomName], function (err, res) {
io.sockets.in(roomName).emit('changedNickname', res, newNickname, oldNickname);
});
});
});
// the client emits this when they want to send a message
socket.on('message', function(roomName, nickname, message, time){
// insert the message into the database
var sql_query = 'INSERT INTO messages (room, nickname, body, time) VALUES ($1, $2, $3, $4);';
conn.query(sql_query, [roomName, nickname, message, time])
.on('end', function() {
});
// broadcast the message to all connected parties
io.sockets.in(roomName).emit('message', nickname, message, time);
});
// the client disconnected/closed their browser window
socket.on('disconnect', function(){
var roomName = socket.roomname;
var roomMembers = getRoomMembers(roomName);
if (roomMembers.length > 0) {
// the room is not empty -> update the list
io.sockets.in(roomName).emit('membershipChanged', roomMembers);
// show that the member has left the room
io.sockets.in(roomName).emit('memberLeft', socket.nickname, date.getTime());
} else {
// the room is empty -> remove the room
var sql_query = 'DELETE FROM messages WHERE room = $1;';
conn.query(sql_query, [roomName])
.on('end', function() {
});
}
});
});
// gets the nicknames of all of the connected parties in a room
function getRoomMembers(roomName) {
var connected = io.sockets.in(roomName).connected;
var connectedList = [];
for (i in connected) {
var nickname = connected[i].nickname;
if (nickname !== undefined) {
connectedList.push(nickname);
}
}
return connectedList;
}
//just render the index!
app.get('/', function(request, response) {
// render the home page
response.render('index.html');
});
app.get('/room/:roomName', function(request, response){
response.render(viewPath + 'room.html', {roomName: request.params.roomName});
});
app.get('/:roomName/messages.json', function(request, response){
// fetch all of the messages for this room
var sql_query = 'SELECT * FROM messages WHERE room=$1 ORDER BY time ASC';
conn.query(sql_query, [request.params.roomName], function (err, res) {
response.json(res);
});
});
app.post('/:roomName/messages', function(request, response){
// post everything to the database, then...
var nickName = request.body.nickname;
var message = request.body.message;
var roomName = request.params.roomName;
var time = date.getTime();
var sql_query = 'INSERT INTO messages (room, nickname, body, time) VALUES ($1, $2, $3, $4);';
conn.query(sql_query, [roomName, nickName, message, time])
.on('end', function() {
});
response.redirect('/room/' + request.params.roomName);
});
// build a new room
app.post('/new/room', function(request, response) {
var identifier = generateUniqueRoomIdentifier();
response.send(identifier);
});
// generate a random identifier
function generateRoomIdentifier() {
// make a list of legal characters
// we're intentionally excluding 0, O, I, and 1 for readability
var chars = 'ABCDEFGHJKLMNPQRSTUVWXYZ23456789';
var result = '';
for (var i = 0; i < 6; i++)
result += chars.charAt(Math.floor(Math.random() * chars.length));
return result;
}
// make sure that the room name is unique
function generateUniqueRoomIdentifier() {
var id = generateRoomIdentifier();
while (room_map[id] != undefined) {
id = generateRoomIdentifier();
}
room_map[id] = true;
return id;
}