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express_server.js
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express_server.js
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//==================================
// Project - TinyApp
// Author - Maninder Sidhu
// MAJOR RELEASE 1.0
// 11th NOVEMBER 2021
//=================================
const express = require("express");
const bodyParser = require("body-parser");
const cookieSession = require("cookie-session");
const bcrypt = require('bcryptjs');
const saltRounds = 10;
//const cookieParser = require('cookie-parser');
const morgan = require('morgan');
const app = express();
const { generateRandomString, getUserByEmail , urlsForUser } = require('./helpers');
//PORT
const PORT = 8080; // default port 8080
// MiddleWare
app.use(cookieSession({
name: 'session',
keys: ['key1', 'key2']
}));
app.use(express.urlencoded({extended: true}));
// app.use(cookieParser());
app.set("view engine", "ejs");
app.use(morgan('dev'));
// Database
const urlDatabase = {
"b2xVn2": { longURL: "http://www.lighthouselabs.ca", userID: "aJ48lW"},
"9sm5xK": { longURL: "http://www.google.com", userID: "aJ48lW"},
"b6UTxQ": { longURL: "https://www.tsn.ca", userID: "aJ48lW" },
"i3BoGr": { longURL: "https://ca.yahoo.com/", userID: "aJ48lW"},
"kyekdy": { longURL: "https://www.freecodecamp.org", userID: "jmB0jt"},
"b2xVw2": { longURL: "http://www.lighthouselabs.ca", userID: "jmB0jt"},
"9sm5sK": { longURL: "http://www.google.com", userID: "jmB0jt"},
"b6UTeQ": { longURL: "https://www.tsn.ca", userID: "jmB0jt" },
"i3BqGr": { longURL: "https://ca.yahoo.com/", userID: "jmB0jt"},
"ndjsde": { longURL: "https://nodejs.dev", userID: "jmB0jt"},
"jsBest": { longURL: "https://www.javascript.com", userID: "mtswd2"}
};
const users = {
"aJ48lW": {
id: "aJ48lW",
email: "user@example.com",
password: bcrypt.hashSync("purple-monkey-dinosaur", saltRounds)
},
"jmB0jt": {
id: "jmB0jt",
email: "user2@example.com",
password: bcrypt.hashSync("dishwasher-funk", saltRounds)
},
"mtswd2": {
id: "mtswd2",
email: "user3@example.com",
password: bcrypt.hashSync("123", saltRounds)
}
};
// GET Requests
//===========================================================
// redirects to /urls if logged in, or /login if not logged in
app.get("/", (req, res) => {
if (req.session.user_id) {
res.redirect("/urls");
} else {
res.redirect("/login");
}
});
//renders URLs page with list of all the URLs currently in the database
app.get("/urls", (req, res) => {
const templateVars = { urls: urlsForUser(req.session.user_id, urlDatabase), user: users[req.session.user_id] };
res.render("urls_index", templateVars);
});
//renders new URL page
app.get("/urls/new", (req, res) => {
if (req.session.user_id) {
res.render("urls_new", { user: users[req.session.user_id] });
} else {
res.redirect("/login");
}
});
//renders individual page for a URL
app.get("/urls/:id", (req, res) => {
if (!urlDatabase[req.params.id]) {
return res.send("<html><h1>Error: this URL does not exist</h1></html> ");
} else if (!req.session.user_id) {
return res.send("<html><h1>Error: please login to view this page</h1></html> ");
} else if (req.session.user_id !== urlDatabase[req.params.id].userID) {
return res.send('<html><h1>Error: you do not have permission to view this URL</h1></html>');
}
const templateVars = { shortURL: req.params.id, longURL: urlDatabase[req.params.id].longURL, user: users[req.session.user_id] };
res.render("urls_show", templateVars);
});
//redirects to the actual page when user clicks on short url link
app.get("/u/:id", (req, res) => {
const urlID = urlDatabase[req.params.id];
if (urlID === undefined) {
res.statusCode = 404;
return res.send("<html><h1>Error: shortURL does not exist</h1></html>");
} else {
res.redirect(urlID.longURL);
}
});
// POST REQUESTS
//==================================================================================
//generates a new shortURL, adds it to the database, and redirects to the "show" page
app.post("/urls", (req, res) => {
if (!req.session.user_id) {
return res.send('<html><h1>Error: please login to view this page</h1></html>');
}
let tempString = generateRandomString();
urlDatabase[tempString] = {
longURL: req.body.longURL,
userID: req.session.user_id
};
return res.redirect(`/urls/${tempString}`);
});
//EDIT URL: updates an existing url in the database, and redirects back to URLs page
app.post("/urls/:id", (req, res) => {
if (req.session.user_id && req.session.user_id === urlDatabase[req.params.id].userID) {
urlDatabase[req.params.id].longURL = req.body.longURL;
res.redirect("/urls");
} else {
return res.send("<html><h1>Error: you do not have permission to edit this URL</h1></html>");
}
});
//DELETE URL: removes a URL resource and redirects back to URLs page
app.post("/urls/:id/delete", (req, res) => {
console.log("req.session", req.session);
if (req.session.user_id && req.session.user_id === urlDatabase[req.params.id].userID) {
delete urlDatabase[req.params.id];
return res.redirect("/urls");
}
return res.send("<html><h1>Error: you do not have permission to delete this URL</h1></html>");
});
// LOGIN AND REGISTER REQUESTS
//=================================================================
app.get("/login", (req, res) => {
if (req.session.user_id) {
return res.redirect("/urls");
}
const templateVars = { user: users[req.session.user_id] };
res.render("login", templateVars);
});
// Logs in user by creating encrypted cookie, then redirects to /urls
app.post("/login", (req, res) => {
const userId = getUserByEmail(req.body.email, users);
if (!userId) {
res.statusCode = 403;
return res.send("<html><h1>Error: User does not exist</h1></html>");
} else if (!bcrypt.compareSync(req.body.password, users[userId].password)) {
res.statusCode = 403;
return res.send("<html><h1>Error: incorrect password</h1></html>");
} else {
req.session["user_id"] = userId;
return res.redirect("/urls");
}
});
//renders register page (unless user is already logged in)
app.get("/register", (req, res) => {
if (req.session.user_id) {
return res.redirect("/urls");
}
const templateVars = { user: users[req.session.user_id] };
return res.render("register", templateVars);
});
// Adds user to database with hashed password, creates encrypted cookie (login), then redirects to /urls
app.post("/register", (req, res) => {
if (req.body.email === "" || req.body.password === "") {
res.statusCode = 400;
return res.send("<html><h1>Error: Please enter an email and password</h1></html>");
} else if (users[getUserByEmail(req.body.email, users)]) {
res.statusCode = 400;
return res.send("<html><h1>Error: Email already exists</h1></html>");
} else {
const id = generateRandomString();
users[id] = {
id,
email: req.body.email,
password: bcrypt.hashSync(req.body.password, saltRounds)
};
req.session["user_id"] = id;
return res.redirect("/urls");
}
});
app.post("/logout", (req, res) => {
delete req.session.user_id;
res.redirect("/urls");
});
//Debug
app.get("/urls.json", (req, res) => {
res.json(urlDatabase);
});
// LISTENER
app.listen(PORT, () => {
console.log(`TinyApp server listening on port ${PORT}!`);
});
// ---------------------------------------------------------------
// - MAJOR RELEASE 1.0 -
//=================================================================