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app.js
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app.js
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var express = require('express');
var bodyParser = require('body-parser');
var cookieParser = require('cookie-parser');
var utils = require('./src/utils.js');
var VoteSessionFactory = require('./src/voteSessionFactory');
var VoteManager = require('./src/voteManager');
var CodeManager = require('./src/codeManager');
var VoteCounter = require('./src/voteCounter');
var app = express();
app.set('port', (process.env.PORT || 5000));
app.set('password', (process.env.PASSWORD));
app.set('users', parseInt(process.env.NUM_USERS, 10) || 20);
app.set('codesPerUser', parseInt(process.env.CODES_PER_USER, 10) || 20);
if (!app.get('password')) {
throw "PASSWORD NOT SET!";
}
var vote = {};
var voteManager = null;
var codeManager = new CodeManager();
var adminToken = null;
var latestResult = {
votesCount: [],
winners: [],
rawVotes: []
};
var numberOfInvalidVotes = 0;
var numberOfAdminLoginTries = 0;
var conf = {
pass: app.get('password'),
users: app.get('users'),
lengthOfCodes: 9,
nbrOfCodesPerUser: app.get('codesPerUser')
};
// Tell user to use HTTPS
app.use(function(req, res, next) {
if(req.headers['x-forwarded-proto']!='https') {
return res.end('Please visit the site with HTTPS');
} else {
next();
}
});
app.use(function(req, res, next) {
if (numberOfInvalidVotes > 50000 || numberOfAdminLoginTries > 1000) {
return res.status(429).end('Server down, too many requests');
} else {
next();
}
});
app.use(bodyParser.json()); // support json encoded bodies
app.use(bodyParser.urlencoded({ extended: true })); // support encoded bodies
app.use(cookieParser());
app.use(express.static('public'));
app.set('views', __dirname + '/public');
app.set('view engine', 'ejs');
app.engine('html', require('ejs').renderFile);
var POSSIBLE_STATES = {
noVote: "noVote",
vote: "vote",
result: "result"
};
function isAuthenticated(req, res) {
var header = req.header('Authorization');
if (adminToken === null || header === null || header.substring(6) !== adminToken) {
numberOfAdminLoginTries++;
res.status(401).end();
return false;
}
return true;
}
app.locals.POSSIBLE_STATES = POSSIBLE_STATES;
app.locals.CURRENT_STATE = POSSIBLE_STATES.noVote;
app.get('/health-check', function(req, res) {
res.json({
codesGenerated: codeManager && codeManager.codesGenerated
}).end();
});
app.get('/status', function(req, res) {
switch (app.locals.CURRENT_STATE) {
case POSSIBLE_STATES.noVote:
res.json({
sessionNumber: codeManager.currentSession,
state: app.locals.CURRENT_STATE,
codesGenerated: codeManager.codesGenerated
});
break;
case POSSIBLE_STATES.vote:
res.json({
sessionNumber: codeManager.currentSession,
state: app.locals.CURRENT_STATE,
maximumNbrOfVotes: vote.maximumNbrOfVotes,
codesGenerated: codeManager.codesGenerated,
candidates: vote.options.shuffle(),
vacants: vote.vacantOptions,
votesReceived: voteManager.getTotalVoteCount(),
codeLength: conf.lengthOfCodes
});
break;
case POSSIBLE_STATES.result:
res.json({
sessionNumber: codeManager.currentSession,
state: app.locals.CURRENT_STATE,
codesGenerated: codeManager.codesGenerated,
winners: vote.winners.shuffle()
});
}
res.end();
});
app.post('/login', function(req, res) {
if (req.body.pass === conf.pass) {
adminToken = utils.randomToken(30);
res
.set('Authorization', 'token ' + adminToken)
.end();
} else {
numberOfAdminLoginTries++;
res.status(403).end();
}
});
app.post('/vote', function(req, res) {
var voteData = req.body.vote;
var code = req.body.code;
try {
if (app.locals.CURRENT_STATE !== POSSIBLE_STATES.vote) {
throw 'Voting is closed';
}
if (!codeManager.isValidCode(code)) {
throw 'Invalid code';
}
voteManager.castVote(voteData);
codeManager.invalidateCode(code);
} catch (e) {
res.status(400).send('FAIL: ' + e);
numberOfInvalidVotes++;
}
res.end();
});
app.get('/admin/print', function(req, res) {
if (isAuthenticated(req, res)) {
var codes = codeManager.generateCodes(conf.users, conf.nbrOfCodesPerUser, conf.lengthOfCodes);
res.json({
codes: codes.transpose()
}).end();
}
});
app.post('/createVoteSession', function(req, res) {
if (isAuthenticated(req, res)) {
try {
codeManager.nextSession();
var candidates = req.body.candidates.map(c => c.trim()).filter(c => c !== '');
var vacantEnabled = req.body.vacant;
var maxCandidates = parseInt(req.body.max_candidates, 10);
latestResult.votesCount = [];
latestResult.winners = [];
latestResult.rawVotes = [];
vote = VoteSessionFactory.createVoteSession(candidates, vacantEnabled, maxCandidates);
voteManager = new VoteManager(vote.options,
vote.vacantOptions,
vote.maximumNbrOfVotes);
app.locals.CURRENT_STATE = POSSIBLE_STATES.vote;
} catch (e) {
res.status(400).send('FAIL: ' + e);
}
res.end();
}
});
app.post('/admin/complete', function(req, res) {
if (isAuthenticated(req, res)) {
var votesCount = voteManager.closeVotingSession();
vote.winners = VoteCounter.countVotes(votesCount, vote.maximumNbrOfVotes);
latestResult.votesCount = votesCount;
latestResult.winners = vote.winners;
latestResult.rawVotes = voteManager.getRawVotes();
app.locals.CURRENT_STATE = POSSIBLE_STATES.result;
res.end();
}
});
app.get('/admin/result', function(req, res) {
if (isAuthenticated(req, res)) {
res.json(latestResult);
res.end();
}
})
app.get(['/', '/admin', '/admin/*'], function(req, res) {
res.render('index.html');
});
var server = app.listen(app.get('port'), function() {
var host = server.address().address;
var port = server.address().port;
console.log('VoteIT listening at http://%s:%s', host, port);
});