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express_server.js
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express_server.js
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// Import libraries and modules
const express = require("express");
const bodyParser = require("body-parser");
const { users } = require("./db/users");
const { urlDatabase } = require("./db/urls");
const { error } = require("./helper/error");
const cookieSession = require("cookie-session");
// Configure Express
const app = express();
app.set("view engine", "ejs");
app.use(bodyParser.urlencoded({ extended: true }));
const PORT = 8080; // default port 8080
app.listen(PORT, () => {
console.log(`TinyURL is listening on port ${PORT}!`);
});
app.use(
cookieSession({
name: "session",
keys: ["8sedLL65XkQpHAA6ksCPcHfJHhpELjGsxi7?S$hy"],
})
);
/**
*
* HOME ROUTE
*
*/
app.get("/", (req, res) => {
const userID = req.session.user_id;
if (users.isUser(userID)) {
res.redirect("/urls");
} else {
res.redirect("/login");
}
});
/**
*
* USER AUTHENTIFICATION ROUTES
*
*/
// ./register >> User registration page (GET) and registration submission (POST)
app
.route("/register")
.get((req, res) => {
const userID = req.session.user_id;
// if user is connected
if (users.isUser(userID)) {
res.redirect("/urls");
// if user is not connected
} else {
const templateVars = { user: users[userID] };
res.render("register", templateVars);
}
})
.post((req, res) => {
const newUser = users.register(req.body);
// if account creation is a success
if (newUser) {
req.session.user_id = newUser.id;
res.redirect("/urls");
// if account creation failed
} else {
error.render("duplicateUser", res);
}
});
// ./login >> User login page (GET) and login submission (POST)
app
.route("/login")
.get((req, res) => {
const userID = req.session.user_id;
// if user is connected
if (users.isUser(userID)) {
res.redirect("/urls");
// if user is not connected
} else {
const templateVars = { user: users[userID] };
res.render("login", templateVars);
}
})
.post((req, res) => {
const matchingUserID = users.loginCheck(req.body);
// if login is a success
if (matchingUserID) {
req.session.user_id = matchingUserID;
res.redirect("/urls");
// if login failed
} else {
error.render("wrongCredentials", res);
}
});
// ./logout >> Logging out user by clearing cookie
app.post("/logout", (req, res) => {
req.session = null;
res.redirect("/");
});
/**
*
* URL ROUTES
*
*/
// ./urls >> List all of users redirections if logged in
app
.route("/urls")
.get((req, res) => {
const userID = req.session.user_id;
// if user is connected
if (users.isUser(userID)) {
const templateVars = {
urls: urlDatabase.getUrlsForUser(req.session.user_id),
user: users[req.session.user_id],
};
res.render("urls_index", templateVars);
// if user is not connected
} else {
error.render(401, res);
}
})
.post((req, res) => {
const userID = req.session.user_id;
// if user is connected
if (users.isUser(userID)) {
const shortURL = urlDatabase.addLink(req.body["longURL"], userID);
res.redirect(`urls/${shortURL}`);
// if user is not connected
} else {
error.render(401, res);
}
});
// ./urls/new >> New redirection form
app.get("/urls/new", (req, res) => {
const userID = req.session.user_id;
// if user is connected
if (users.isUser(userID)) {
const templateVars = { user: users[userID] };
res.render("urls_new", templateVars);
// if user is not connected
} else {
res.redirect("/login");
}
});
// ./urls/:shortURL >> See the state (GET) or modify the reidirection (POST)
app
.route("/urls/:shortURL")
.get((req, res) => {
const userID = req.session.user_id;
const shortURL = req.params.shortURL;
// if user is connected and owner of that link
if (urlDatabase.getUrlsForUser(userID)[shortURL]) {
const templateVars = {
shortURL,
longURL: urlDatabase.getLongUrl(shortURL),
user: users[userID],
};
res.render("urls_show", templateVars);
// if user is connected but do not own that link
} else if (users[userID] && urlDatabase.getLongUrl(shortURL)) {
error.render(403, res);
// if link exists but user is not connected
} else if (urlDatabase.getLongUrl(shortURL)) {
error.render(401, res);
// if link does not exist
} else {
error.render(404, res);
}
}) // Update redirection
.post((req, res) => {
const userID = req.session.user_id;
const shortURL = req.params.shortURL;
const newURL = req.body["newURL"];
// if user is logged in and owns the URL for the given ID
if (urlDatabase.getUrlsForUser(userID)[shortURL]) {
urlDatabase.modifyLink(shortURL, newURL, userID);
res.redirect(`/urls`);
// if user is logged in but does not own the URL for the given ID
} else if (users.isUser(userID)) {
error.render(403, res);
} else {
// if user is not logged in
error.render(401, res);
}
});
// ./urls/:shortURL/delete >> Delete a redirection (POST)
app.post("/urls/:shortURL/delete", (req, res) => {
const userID = req.session.user_id;
const shortURL = req.params.shortURL;
// if user is logged in and owns the URL for the given ID
if (urlDatabase.getUrlsForUser(userID)[shortURL]) {
urlDatabase.deleteLink(req.params["shortURL"], userID);
res.redirect("/urls");
// if user is logged in but does not own the URL for the given ID
} else if (users.isUser(userID)) {
error.render(403, res);
} else {
// if user is not logged in
error.render(401, res);
}
});
// ./u/:shortURL >> redirecting to longURL as instructed by the urlDatabase
app.get("/u/:shortURL", (req, res) => {
const longURL = urlDatabase.getLongUrl(req.params.shortURL);
// if URL exists in DB
if (longURL) {
res.redirect(longURL);
} else {
// if URL does not exists in DB
error.render(404, res);
}
});
/**
*
* ERROR 404 ROUTE
*
*/
// ./:any >> redirect to 404 Error page
app.get("/:any", (req, res) => {
error.render(404, res);
});