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express_server.js
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express_server.js
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//==============================
// DEPENDENCIES
//==============================
const express = require('express');
const methodOverride = require('method-override');
const cookieSession = require('cookie-session');
const app = express();
app.use(methodOverride('_method'));
const PORT = 8080;
const bcrypt = require('bcryptjs');
//===========================
// FUNCTIONS
//===========================
const { getUserByEmail, generateRandomString, urlsForUser } = require('./helpers');
//=========================
// OBJECTS
//=========================
const urlDatabase = {
b6UTxQ: {
longURL: 'https://www.tsn.ca',
userID: 'aJ48lW',
visits: {},
totalVisits: 0,
uniqueVisits: 0,
createdDate: 0,
},
i3BoGr: {
longURL: 'https://www.google.ca',
userID: 'aJ48lW',
visits: {},
totalVisits: 0,
uniqueVisits: 0,
createdDate: 0,
}
};
// TEST DATA
const users = {
userRandomID: {
id: 'user1RandomID',
email: 'user@example.com',
password: 'yellow-snake-bird',
},
user2RandomID: {
id: 'user2RandomID',
email: 'user2@example.com',
password: 'washing-machine-soap',
},
};
// Styling for error message pages
const htmlBodyStart = '<html><body>';
const textStyle = `<p style='font-family: Verdana, sans-serif; font-size: 16px'>`;
const loginLink = `<a href='/login'>HERE</a>`;
const registerLink = `<a href='/register'>HERE</a>`;
const htmlBodyEnd = `</body></html>\n`;
//============================
// MIDDLEWARE
//============================
app.set('view engine', 'ejs');
app.use(express.urlencoded({ extended: true }));
app.use(cookieSession({
name: 'session',
keys: ['gudetama'],
maxAge: 24 * 60 * 60 * 1000 // 24 hours
}));
//========================
// ROUTES
//========================
//============================
// GET ROUTES
//============================
//===================================
// GET ROOT PATH '/'
//===================================
/**
* Handle t the root route of the application.
*
* @param {import('express').Request} req - The Express request object.
* @param {import('express').Response} res - The Express response object.
* @returns {void}
*/
app.get('/', (req, res) => {
if (!req.session.userId) {
return res.redirect('/login');
}
return res.redirect('/urls');
});
//===============================
// GET /URLS/NEW
//===============================
/**
* Render the "Create New URL" page, allowing a user to create a new short URL.
*
* @param {import('express').Request} req - The Express request object.
* @param {import('express').Response} res - The Express response object.
* @returns {void}
*/
app.get('/urls/new', (req, res) => {
const templateVars = {
user: users[req.session.userId]
};
if (!req.session.userId) {
return res.redirect('/login');
}
res.render('urls_new', templateVars);
});
//===============================
// GET /URLS/:ID
//===============================
/**
* Handle GET request for a specific URL by ID.
*
* @param {import('express').Request} req - The Express request object.
* @param {import('express').Response} res - The Express response object.
*/
app.get('/urls/:id', (req, res) => {
if (!urlDatabase[req.params.id]) {
return res.status(404).send(`
${htmlBodyStart}
${textStyle}
Response Status Code: ${res.statusCode}<br><br>
The Short URL ID provided (${req.params.id}) does not exist.<br><br>
Please try again.
${htmlBodyEnd}`);
}
if (!req.session.userId) {
return res.status(401).send(`
${htmlBodyStart}
${textStyle}
Response Status Code: ${res.statusCode}<br><br>
Must be logged in to view this page.<br><br>
Please click ${loginLink} to login, or ${registerLink} to register for a new account! 🙂
${htmlBodyEnd}`);
}
if (!urlsForUser(req.session.userId, urlDatabase)[req.params.id]) {
return res.status(403).send(`
${htmlBodyStart}
${textStyle}
Response Status Code: ${res.statusCode}<br><br>
You do not have permission to access this URL.<br><br>
Please click <a href='/urls'>HERE</a> to access your owned URLs.
${htmlBodyEnd}`);
}
const url = urlDatabase[req.params.id];
const totalVisits = url.totalVisits;
const uniqueVisits = url.uniqueVisits;
const createdDate = url.createdDate;
const templateVars = {
user: users[req.session.userId],
id: req.params.id,
longURL: urlDatabase[req.params.id].longURL,
urls: urlsForUser(req.session.userId, urlDatabase),
totalVisits,
uniqueVisits,
visitorID: req.session.visitorID,
createdDate
};
res.render('urls_show', templateVars);
});
//============================
// GET /U/:ID
//============================
/**
* Handle GET request for redirecting to the long URL associated with a Short URL ID.
*
* @param {import('express').Request} req - The Express request object.
* @param {import('express').Response} res - The Express response object.
*/
app.get('/u/:id', (req, res) => {
if (!urlDatabase[req.params.id]) {
return res.status(404).send(`
${htmlBodyStart}
${textStyle}
Response Status Code: ${res.statusCode}<br><br>
The Short URL ID provided (${req.params.id}) does not exist.<br><br>
Please try again.
${htmlBodyEnd}`);
}
//-------------------------------
// TRACK VISITS TO /U/:IDs
//-------------------------------
const url = urlDatabase[req.params.id];
const timestamp = new Date().toISOString();
let totalVisits = req.session.views || 0;
totalVisits += 1;
req.session.views = totalVisits;
const visitorID = req.session.visitorID || generateRandomString();
if (!req.session.visitorID) {
req.session.visitorID = visitorID;
}
let uniqueVisits = urlDatabase[req.params.id];
if (!uniqueVisits) {
uniqueVisits = 0;
}
if (!url.visits[visitorID]) {
url.visits[visitorID] = { timestamp: timestamp.toLocaleLowerCase() };
url.uniqueVisits += 1;
}
urlDatabase[req.params.id].totalVisits += 1;
const longURL = urlDatabase[req.params.id].longURL;
res.redirect(longURL);
});
//===========================
// GET /URLS
//===========================
/**
* Handle GET request to display the list of URLs for the logged-in user.
*
* @param {import('express').Request} req - The Express request object.
* @param {import('express').Response} res - The Express response object.
*/
app.get('/urls', (req, res) => {
if (!req.session.userId) {
return res.status(401).send(`
${htmlBodyStart}
${textStyle}
Response Status Code: ${res.statusCode}<br><br>
Must be logged in to view URLs.<br><br>
Please click ${loginLink} to login, or ${registerLink} to register for a new account! 🙂
${htmlBodyEnd}`);
}
const templateVars = {
user: users[req.session.userId],
urls: urlsForUser(req.session.userId, urlDatabase),
};
res.render('urls_index', templateVars);
});
//===============================
// GET /REGISTER
//===============================
/**
* Handle GET request for user registration page.
*
* @param {import('express').Request} req - The Express request object.
* @param {import('express').Response} res - The Express response object.
*/
app.get('/register', (req, res) => {
const templateVars = {
user: users[req.session.userId]
};
if (req.session.userId) {
return res.redirect('/urls');
}
res.render('register', templateVars);
});
//============================
// GET /LOGIN
//============================
/**
* Handle GET request for user login page.
*
* @param {import('express').Request} req - The Express request object.
* @param {import('express').Response} res - The Express response object.
*/
app.get('/login', (req, res) => {
const templateVars = {
user: users[req.session.userId]
};
if (req.session.userId) {
return res.redirect('/urls');
}
res.render('login', templateVars);
});
//=============================
// POST ROUTES
//=============================
//============================
// POST /URLS
//============================
/**
* Handle POST request for creating a new Short URL.
*
* @param {import('express').Request} req - The Express request object.
* @param {import('express').Response} res - The Express response object.
*/
app.post('/urls', (req, res) => {
if (!req.session.userId) {
return res.status(401).send(`
${htmlBodyStart}
${textStyle}
Response Status Code: ${res.statusCode}<br><br>
Must be logged in to create a new short URL.<br><br>
Please click ${loginLink} to login, or ${registerLink} to register for a new account! 🙂
${htmlBodyEnd}`);
}
const longURL = req.body.longURL;
const id = generateRandomString();
urlDatabase[id] = {
longURL,
userID: req.session.userId,
visits: {},
totalVisits: 0,
uniqueVisits: 0,
createdDate: new Date().toISOString()
};
res.redirect(`/urls/${id}`);
});
//=============================
// POST /LOGIN
//=============================
/**
* Handle POST request for existing user sign-in.
*
* @param {import('express').Request} req - The Express request object.
* @param {import('express').Response} res - The Express response object.
*/
app.post('/login', (req, res) => {
const email = req.body.email;
const password = req.body.password;
if (!email || !password) {
return res.status(403).send(`
${htmlBodyStart}
${textStyle}
Response Status Code: ${res.statusCode}<br><br>
Login failed. Please doublecheck the credentials provided.<br><br>
Please click ${loginLink} to login, or ${registerLink} to register for a new account! 🙂
${htmlBodyEnd}`);
}
const user = getUserByEmail(email, users);
if (!user) {
return res.status(403).send(`
${htmlBodyStart}
${textStyle}
Response Status Code: ${res.statusCode}<br><br>
No account found with the email address provided.<br><br>
Please click ${registerLink} to register! 🙂
${htmlBodyEnd}`);
}
if (user && !bcrypt.compareSync(password, user.password)) {
return res.status(403).send(`
${htmlBodyStart}
${textStyle}
Response Status Code: ${res.statusCode}<br><br>
Login failed. Please doublecheck the credentials provided.<br><br>
Please click ${loginLink} to login, or ${registerLink} to register for a new account! 🙂
${htmlBodyEnd}`);
}
req.session.userId = user.id;
res.redirect('/urls');
});
//==============================
// POST /LOGOUT
//==============================
/**
* Handle POST request for user sign-out.
*
* @param {import('express').Request} req - The Express request object.
* @param {import('express').Response} res - The Express response object.
*/
app.post('/logout', (req, res) => {
req.session = null;
res.redirect('/login');
});
//================================
// POST /REGISTER
//================================
/**
* Handle POST request for new user sign-up.
*
* @param {import('express').Request} req - The Express request object.
* @param {import('express').Response} res - The Express response object.
*/
app.post('/register', (req, res) => {
const email = req.body.email;
const password = req.body.password;
if (!email || !password) {
return res.status(400).send(`
${htmlBodyStart}
${textStyle}
Response Status Code: ${res.statusCode}<br><br>
Please enter a valid email address and a secure password.<br><br>
Click ${registerLink} to try again! 🙂
${htmlBodyEnd}`);
}
if (getUserByEmail(email, users)) {
return res.status(400).send(`
${htmlBodyStart}
${textStyle}
Response Status Code: ${res.statusCode}<br><br>
An account already exists for the email address provided.<br><br>
Please click ${loginLink} to login! 🙂
${htmlBodyEnd}`);
}
const userID = generateRandomString();
const hashedPassword = bcrypt.hashSync(password, 10);
users[userID] = {
id: userID,
email,
password: hashedPassword
};
req.session.userId = userID;
res.redirect('/urls');
});
//============================
// PUT ROUTES
//============================
//===============================
// PUT /URLS/:ID
//===============================
/**
* Handle PUT request for editing a Short URL by its ID.
*
* @param {import('express').Request} req - The Express request object.
* @param {import('express').Response} res - The Express response object.
*/
app.put('/urls/:id', (req, res) => {
if (!req.session.userId) {
return res.status(401).send(`
${htmlBodyStart}
${textStyle}
Response Status Code: ${res.statusCode}<br><br>
Must be logged in to edit a short URL.<br><br>
Please click ${loginLink} to login, or ${registerLink} to register for a new account! 🙂
${htmlBodyEnd}`);
}
const id = req.params.id;
if (!urlDatabase[id]) {
return res.status(404).send(`
${htmlBodyStart}
${textStyle}
Response Status Code: ${res.statusCode}<br><br>
The Short URL ID provided (${req.params.id}) does not exist.<br><br>
Please try again.
${htmlBodyEnd}`);
}
if (!urlsForUser(req.session.userId, urlDatabase)[id]) {
return res.status(403).send(`
${htmlBodyStart}
${textStyle}
Response Status Code: ${res.statusCode}<br><br>
You do not have permission to edit this URL.<br><br>
Please click <a href='/urls'>HERE</a> to access your owned URLs.
${htmlBodyEnd}`);
}
const longURL = req.body.newURL;
urlDatabase[id].longURL = longURL;
res.redirect('/urls');
});
//===============================
// DELETE ROUTES
//===============================
//==================================
// DELETE /URLS/:ID
//==================================
/**
* Handle the deletion of a Short URL by its ID.
*
* @param {Object} req - The request object.
* @param {Object} res - The response object.
*/
app.delete('/urls/:id', (req, res) => {
if (!req.session.userId) {
return res.status(401).send(`
${htmlBodyStart}
${textStyle}
Response Status Code: ${res.statusCode}<br><br>
Must be logged in to delete a short URL.<br><br>
Please click ${loginLink} to login, or ${registerLink} to register for a new account! 🙂
${htmlBodyEnd}`);
}
const id = req.params.id;
if (!urlDatabase[id]) {
return res.status(404).send(`
${htmlBodyStart}
${textStyle}
Response Status Code: ${res.statusCode}<br><br>
The Short URL ID provided (${req.params.id}) does not exist.<br><br>
Please try again.
${htmlBodyEnd}`);
}
if (!urlsForUser(req.session.userId, urlDatabase)[id]) {
return res.status(403).send(`
${htmlBodyStart}
${textStyle}
Response Status Code: ${res.statusCode}<br><br>
You do not have permission to delete this URL.<br><br>
Please click <a href='/urls'>HERE</a> to access your owned URLs.
${htmlBodyEnd}`);
}
delete urlDatabase[id];
res.redirect('/urls');
});
//===============================
// END OF ROUTES
//===============================
app.listen(PORT, () => {
console.log(`App is listening on port ${PORT}! 😀`);
});