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const express = require('express');
const sha512 = require('js-sha512');
const shortid = require('shortid');
const salt = 'suola';
const db = require('./db');
const buildSessionCookie = ({ sessionId, isLogout, remember }) => {
if (!isLogout) {
if (remember) {
return `sessionId=${sessionId}; Domain=localhost; HttpOnly; SameSite=strict;`;
} else {
return `sessionId=${sessionId}; Domain=localhost; HttpOnly; SameSite=strict; Max-Age=86400;`;
}
} else {
return `sessionId=deleted; Domain=localhost; Expires=Thu, 01 Jan 1970 00:00:00 GMT; HttpOnly; SameSite=strict;`;
}
};
const normalRouter = express.Router();
const authedRouter = express.Router();
authedRouter.use(async (req, res, next) => {
const cookies = req.cookies;
const { sessionId } = cookies;
if (!sessionId) {
res.status(403);
return res.json({
message: 'Log in first!',
});
}
const token = await db('tokens').where('value', sessionId).first();
if (!token) {
res.status(400);
res.set('Set-Cookie', buildSessionCookie({ isLogout: true }));
return res.json({
message: 'Invalid session token.',
sessionId,
});
}
const user = await db('users').where({ id: token.user_id }).first();
req.sessionId = sessionId;
req.user = user;
next();
});
normalRouter.get('/', (req, res) => {
res.json({
message: 'Backend API',
});
});
normalRouter.post('/register', async (req, res) => {
const { username, password } = req.body;
if (!username || !password) {
res.status(400);
return res.json({
error: 'Username or password missing.',
});
}
const existingUuser = await db('users').where({ username }).first();
if (existingUuser) {
res.status(400);
return res.json({
error: 'Username already taken.',
});
}
const pwHash = sha512(salt + password);
const sessionId = shortid.generate();
const user = (await db('users').insert({ username, password: pwHash }).returning('*'))[0];
await db('tokens').insert({ user_id: user.id, type: 'session', value: sessionId });
res.set('Set-Cookie', buildSessionCookie({ sessionId, remember: false, isLogout: false }));
return res.json({
username,
});
});
normalRouter.post('/login', async (req, res) => {
const { username, password, remember } = req.body;
if (!username || !password) {
res.status(400);
return res.json({
error: 'Username or password missing.',
});
}
const user = await db('users').where({ username }).first();
if (user) {
const sessionId = shortid.generate();
await db('tokens').insert({ user_id: user.id, type: 'session', value: sessionId });
res.set('Set-Cookie', buildSessionCookie({ sessionId, remember, isLogout: false }));
return res.json({
username,
});
}
res.status(403);
res.json({
error: 'Wrong username or password',
});
});
authedRouter.post('/logout', async (req, res) => {
if (req.user && req.sessionId) {
await db('tokens').where({ value: req.sessionId }).delete();
}
res.status(204);
res.set('Set-Cookie', buildSessionCookie({ isLogout: true }));
res.send();
});
authedRouter.get('/user', (req, res) => {
const user = req.user;
return res.json({
message: `Hello user ${user.username}!`,
username: user.username,
});
});
module.exports = { authedRouter, normalRouter };
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