app.js

var createError = require('http-errors');
var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var logger = require('morgan');
var session = require('client-sessions');

// models
var Language = require('./models/Language');

// routers
var loginRouter = require('./routes/login');
var logoutRouter = require('./routes/logout');
var indexRouter = require('./routes/index');
var lessonsRouter = require('./routes/lessons');
var languagesRouter = require('./routes/languages');
var vocabulariesRouter = require('./routes/vocabularies');
var learnRouter = require('./routes/learn');

var app = express();

// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'pug');

// define some basic information
app.locals.pageTitle = 'Vocabulary Trainer';
app.locals.navigationPoints = {
	'Lektionen': '/lessons',
	'Sprachen': '/languages',
	'Lernen': '/learn',
	'Abmelden': '/logout'
};

app.use(logger('dev'));
app.use(express.json());

var bodyParser = require('body-parser');
app.use(express.urlencoded({ extended: false, parameterLimit: 1000000000 }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));
app.use(session({
	cookieName: 'session',
	secret: 'ase8flLSe39slPes',
	duration: 120 * 60 * 1000, // 120 mins
	activeDuration: 120 * 60 * 1000, // 120 mins
	httpOnly: true,
	secure: true,
	ephemeral: true
}));

// set root for navigation points
app.use(function (req, res, next) {
	res.locals.root = '/' + req.originalUrl.split('/')[1];
	next();
});

// save selected language
app.use(function (req, res, next) {
	Language.findMain(function (error, language) {
		if (language == null) {
			if (res.locals.root != "/languages" && res.locals.root != "/login" && res.locals.root != "/logout") {
				req.session.flash = { 'type': 'error', 'message': 'Bitte wähle eine aktive Sprache aus.' }
				return res.redirect("/languages")
			}
		} else {
			res.locals.selectedLanguage = language;
		}

		next();
	});
});

// flash
app.use(function (req, res, next) {
	res.locals.flash = req.session.flash;
	delete req.session.flash;
	next();
});

// if the user is not logged in redirect to login
function requireLogin(req, res, next) {
	if (!req.session.user) {
		res.redirect('/login');
	} else {
		next();
	}
};

app.use('/login', loginRouter);
app.use('/logout', logoutRouter);
app.use('/', requireLogin, indexRouter);
app.use('/lessons', requireLogin, lessonsRouter);
app.use('/languages', requireLogin, languagesRouter);
app.use('/vocabularies', requireLogin, vocabulariesRouter);
app.use('/learn', requireLogin, learnRouter);

// catch 404 and forward to error handler
app.use(function (req, res, next) {
	next(createError(404));
});

// error handler
app.use(function (err, req, res, next) {
	// set locals, only providing error in development
	res.locals.message = err.message;
	res.locals.error = req.app.get('env') === 'development' ? err : {};

	// render the error page
	res.status(err.status || 500);
	res.render('error');
});

module.exports = app;