css

var http = require('http');
var fs = require('fs');
var url = require('url');
var express = require('express');
var app = express();
var session = require('express-session');
app.use(session({secret: 'SecurityKeyIDontKnowWhatIsHappening',resave: true,saveUninitialized : false}));
app.use(express.static('statics'));
var bodyParser = require('body-parser')
app.use(bodyParser.json() );       // to support JSON-encoded bodies
app.use(bodyParser.urlencoded({     // to support URL-encoded bodies
  extended: true
}));


function validateEmail(email) {
    var re = /^(([^<>()\[\]\\.,;:\s@"]+(\.[^<>()\[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
    return re.test(email);
};

function validatePass(pass){
  if(pass.length < 5)
    return false;
  for(counter = 0; counter < pass.length; counter++){
    if(pass[counter] == ' ')
      return false;
  }
  return true;
};

function validateName(name){
  if(name.length == 0)
    return false;
  for(counter = 0; counter < name.length; counter++){
    if((name[counter] == ' ' && counter == 0) || (name[counter] >= '0' && name[counter] <= '9'))
      return false;
  }
  return true;
};

function validatePassword(mail , password){
  for (var i = 0; i < users.length; i++) {
    if (users[i].email == mail) {
      if (users[i].password == password){
        return true;
      }
    }
  }
  return false;
};
function validateLogin(mail){
  for (var i = 0; i < users.length; i++) {
    if (users[i].email == mail) {
      return true ;
    }
  }
  return false;
};

function warn(temp){
  temp = "<p style = \"color:red; font-size: 25px\">" + temp + "</p>";
  var x = "<!DOCTYPE html>"+"<html>"+"<head>"+"<link rel=\"stylesheet\" href=\"css/bootstrap.min.css\">"+"<link rel=\"stylesheet\" type=\"text/css\" href=\"theme.css\">"+"</head>"+"<body>"+"<form action=\"login\" method = \"POST\" style = \"margin-left:35%; margin-top:15%\">"+"Mail:<br>"+"<input type=\"text\" name=\"mailLog\" ><br>"+"Password:<br>"+"<input type=\"password\" name=\"passwordLog\" ><br><br>"+"<input type=\"submit\" value=\"Log In\" />"+"</form>"+ temp +"</body>" +"</html>";
  return x;

};

function make(temp){
  temp = "<p style = \"color:red; font-size: 25px\">" + temp + "</p>";
   var x = "<!DOCTYPE html>"+"<html>"+"<head>"+"<link rel=\"stylesheet\" href=\"css/bootstrap.min.css\">"+"<link rel=\"stylesheet\" type=\"text/css\" href=\"theme.css\">"+"</head>"+"<body>"+"<form action=\"register\" method = \"POST\" style = \"margin-left:35%; margin-top:15%\">"+"Name:<br>"+"<input type=\"text\" name=\"nameReg\"><br>"+"Mail:<br>"+"<input type=\"text\" name=\"mailReg\" ><br>"+"Password:<br>"+"<input type=\"password\" name=\"passwordReg\" ><br><br>"+"<input type=\"submit\" value=\"Sign Up\" />"+"</form>"+ temp +"</body>" +"</html>";
   return x;
};

var file_content = fs.readFileSync(__dirname +'/userDB.json');
var users = JSON.parse(file_content);

app.get('/home', function(req,res){
  if(!req.session.email)
    res.redirect("/register");
  else
    res.sendFile(__dirname + "/" + "home.html");
});

app.get('/login', function(req,res){
  if (req.session.email) {
    res.redirect("/home");
  }
  res.sendFile(__dirname + "/" + "log.html");
});

app.post('/login', function(req,res){
  if (req.session.email) {
    res.redirect("/home");
  }
  var getmail = req.body.mailLog;
  var getpass = req.body.passwordLog;
  if(validateLogin(getmail) && validatePassword(getmail, getpass)){
      req.session.email = getmail ;
      res.redirect("/home");
  }else{
  res.writeHead(200, {"Content-Type": "text/html"});
  if(!validateLogin(getmail)){
    res.write(warn("Wrong email, Please recheck."));
  }else if(!validatePassword(getmail , getpass)){
    res.write(warn("Wronge password , please recheck."));
  }
  res.end();
}
});

app.get('/register', function(req,res){
  if (req.session.email) {
    res.redirect("/home");
  }
res.sendFile( __dirname + "/" + "Reg.html" );
});

app.post('/register', function (req, res) {
if (req.session.email) {
  res.redirect("/home");
}
var sentEmail = req.body.mailReg;
var sentName = req.body.nameReg;
var sentPassword = req.body.passwordReg;
   found = false;
console.log(sentEmail + " " + sentName + " " + sentPassword);
if(validateEmail(sentEmail) && validateName(sentName) && validatePass(sentPassword)){
  var newuser = {
     "email" : sentEmail ,
     "name" : sentName ,
     "password" : sentPassword
   }
   console.log(users.length + "ERERE");
   for(var counter = 0; counter < users.length; counter++){
    console.log(counter + " " + users[counter].email + " " + sentEmail);
    if(users[counter] != null && sentEmail == users[counter].email)
    {
      found = true;
    }
   }
   if(!found){
    users.push(newuser);
    fs.writeFileSync(__dirname +'/userDB.json', JSON.stringify(users, null, 3));
    res.redirect('/login');
    }else{
           res.writeHead(200, {"Content-Type": "text/html"});
            res.write(make("Your email is already taken."));
            res.end();
    }
  }
  else{
     res.writeHead(200, {"Content-Type": "text/html"});
     if(!validateEmail(sentEmail)){
      res.write(make("Wrong email format, Please recheck."));
    }else if(!validatePass(sentPassword)){
      res.write(make("Wronge password format, please recheck."));
    }else if(!validateName(sentName)){
      res.write(make("Wrong name format, please recheck."));
     }res.end();
  }
});

var server = app.listen(8081, function () {
var host = server.address().address;
var port = server.address().port
console.log("Example app listening at http://%s:%s", host, port)
});