Lab15/Ex1.js

var express = require('express');
var app = express();
var myParser = require("body-parser");
const fs = require('fs');
const user_data_filename = 
'user_data.json';
var cookieParser = require('cookie-parser');

app.use(cookieParser());;

//check if file exists before reading
if(fs.existsSync(user_data_filename)) {
    stats = fs.statSync(user_data_filename)
    console.log(`user_data.json has ${stats['size']} characters`)
    var data = fs.readFileSync(user_data_filename, 'utf-8');
    users_reg_data = JSON.parse(data);
} 

app.use(myParser.urlencoded({ extended: true }));

app.get("/set_cookie", function (request, response) {
    response.cookie('name', 'Natalie')
    response.send('cookie sent!', {maxAge: 5*1000});
});

app.get("/use_cookie", function (request, response) {
    console.log(request.cookies);
    thename = 'ANONYMOUS';
    if (typeof request.cookies["name"] != 'undefined') {thename = request.cookies["name"]};
    response.send(`Welcome to the Use Cookie page ${thename}`)
});

app.get("/register", function (request, response) {
    // Give a simple register form
    str = `
<body>
<form action="" method="POST">
<input type="text" name="username" size="40" placeholder="enter username" ><br />
<input type="password" name="password" size="40" placeholder="enter password"><br />
<input type="password" name="repeat_password" size="40" placeholder="enter password again"><br />
<input type="email" name="email" size="40" placeholder="enter email"><br />
<input type="submit" value="Submit" id="submit">
</form>
</body>
    `;
    response.send(str);
 });

app.post("/process_register", function (request, response) {
    // process a simple register form
    // validate the registration information
    // if all data is valid, write to user_data_filename and send to invoice
// add new user registration information
    username = request.body.username;;
users_reg_data[username] = {};
users_reg_data[username].password = request.body.password;
users_reg_data[username].email = request.body.email;
// write updated object to user_data_filename
reg_info_str = JSON.stringify(user_reg_data);
fs.writeFileSync(user_data_filename, reg_info_str)
 });

app.get("/login", function (request, response) {
    // Give a simple login form
    str = `
<body>
<form action="process_login" method="POST">
<input type="text" name="username" size="40" placeholder="enter username" ><br />
<input type="password" name="password" size="40" placeholder="enter password"><br />
<input type="submit" value="Submit" id="submit">
</form>
</body>
    `;
    response.send(str);
 });

app.post("/process_login", function (request, response) {
// Process login form POST and redirect to logged in page if ok, back to login page if not
console.log(request.body);
// if username is valid, get password
if(typeof users_reg_data [request.body.username] == 'undefined') {
    if(request.body.password == users_reg_data[request.body.username].password) {
        response.send(`Successful login! :)`);
    } else {
        response.send(`Hey! ${request.body.password} does not match the password we have for you :(`)
    }
}
else { response.send(`Hey! ${request.body.username} does not exist! :(`);
}
});