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app.js
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app.js
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var db = require('mongojs').connect('geochat', ['users']);
var fs = require('fs');
var http = require('http');
var path = require('path');
var io = require('socket.io');
var url = require('url');
// Main app server.
http = http.createServer(function(request, response) {
var uri = url.parse(request.url).pathname;
var filename = path.join(process.cwd(), uri);
path.exists(filename, function(exists) {
if ( ! exists) {
response.writeHead(404, { 'Content-Type': 'text/html' });
fs.readFile(__dirname + '/404.html', function (err, data) {
if (err) {
response.write(err + '\n');
response.end();
}
response.end(data);
});
return;
}
if (fs.statSync(filename).isDirectory()) {
filename += 'index.html';
}
fs.readFile(filename, 'binary', function(err, file) {
if (err) {
response.writeHead(500, { 'Content-Type': 'text/plain' });
response.write(err + '\n');
response.end();
return;
}
response.writeHead(200);
response.write(file, 'binary');
response.end();
return;
});
});
});
http.listen(8000);
// Sockets.
io.listen(http).sockets.on('connection', function (socket) {
// Login.
socket.on('login', function (data) {
db.users.findOne({ username: data.username }, function(err, user) {
if (err) {
console.log('Error: cannot login user.', err);
socket.emit('error', err);
return;
}
if ( ! user) {
db.users.save({ username: data.username, password: data.password }, function(err, saved) {
if (err || ! saved) {
console.log('Error: user not saved.', err);
socket.emit('error', err);
return;
}
console.log('User created.');
});
}
else if (user.password != data.password) {
console.log('Login incorrect for user: ' + user.username);
socket.emit('error', err);
return;
}
socket.set('user', user, function () {
socket.emit('ready');
});
console.log('User ' + data.username + ' logged in.');
});
});
// Position.
socket.on('position', function (position) {
socket.get('user', function (err, user) {
console.log('user: ', user);
if (err || ! user) {
console.log('Error getting user.');
return;
}
if ( ! position.coords || ! position.coords.latitude || ! position.coords.longitude) {
console.log('Incorrect position from user: ' + user.username + ' - ', position);
return;
}
console.log('Received position from user: ' + user.username + ' - [' + position.coords.latitude + ',' + position.coords.longitude + ']');
// Update user position.
db.users.update({ username: user.username }, {
$set: {
pos: {
lat: position.coords.latitude,
lon: position.coords.longitude
}
}
}, function (err, update) {
if (err || ! update)
console.log('Error updating position for user: ' + user.nickname);
socket.get('user', function (err, user) {
user.pos = {
lat: position.coords.latitude,
lon: position.coords.longitude
};
socket.set('user', user);
});
});
});
});
// Message.
socket.on('msg', function (msg) {
if (msg === '')
return;
socket.get('user', function (err, user) {
if (err || ! user)
return;
socket.broadcast.emit('msg', { username: user.username, msg: msg });
});
});
// Handles disconnection.
socket.on('disconnect', function () {
clearInterval(updateUsersInt);
// Clear user position.
socket.get('user', function (err, user) {
if (err || ! user) {
console.log('Error getting user.');
return;
}
db.users.update({ username: user.username }, { $set: { pos: null } }, function (err, update) {
if (err)
console.log('Error updating position for user: ' + user.nickname);
});
});
});
// Update nearby users.
var updateUsersInt = setInterval(function () {
socket.get('user', function (err, user) {
if (err || ! user || ! user.pos)
return;
db.users.find({
pos: {
$near: {
lat: user.pos.lat,
lon: user.pos.lon
}
}
},
{
username: 1
},
function (err, users) {
if (err) {
console.log('Error finding users nearby: [' + position.coords.latitude + ',' + position.coords.longitude + ']', err);
return;
}
socket.emit('users', users);
}).sort({ username: 1 });
});
}, 2000);
});