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const express = require('express');
const router = express.Router();
const sha512 = require('js-sha512');
const shortid = require('shortid');
const salt = 'suola';
const low = require('lowdb');
const FileSync = require('lowdb/adapters/FileSync');
const adapter = new FileSync('db.json');
const db = low(adapter);
db.defaults({ users: [] }).write();
router.get('/', (req, res) => {
res.json({
message: 'Backend API',
});
});
router.post('/register', (req, res) => {
const { username, password } = req.body;
if (!username || !password) {
res.status(400);
return res.json({
error: 'Username or password missing.',
});
}
const user = db.get('users').find({ username }).value();
if (user) {
res.status(400);
return res.json({
error: 'Username already taken.',
});
}
const pwHash = sha512(salt + password);
db.get('users').push({ username, password: pwHash }).write();
return res.json({
username,
});
});
router.post('/login', (req, res) => {
const { username, password } = req.body;
if (!username || !password) {
res.status(400);
return res.json({
error: 'Username or password missing.',
});
}
const userObj = db.get('users').find({ username });
const user = userObj.value();
if (user) {
const sessionId = shortid.generate();
userObj.assign({ sessionId }).write();
res.set('Set-Cookie', `sessionId=${sessionId}`);
return res.json({
username,
});
}
res.status(403);
res.json({
error: 'Wrong username or password',
});
});
router.post('/logout', (req, res) => {
const cookies = req.cookies;
const { sessionId } = cookies;
const userObj = db.get('users').find({ sessionId });
if (userObj) {
userObj.assign({ sessionId: null }).write();
}
res.status(204);
res.set('Set-Cookie', 'sessionId=deleted; expires=Thu, 01 Jan 1970 00:00:00 GMT');
res.send();
});
router.get('/user', (req, res) => {
const cookies = req.cookies;
const { sessionId } = cookies;
if (!sessionId) {
res.status(403);
return res.json({
message: 'Log in first!',
});
}
const userObj = db.get('users').find({ sessionId });
const user = userObj.value();
if (userObj) {
return res.json({
message: `Hello user ${user.username}!`,
username: user.username,
});
}
res.status(400);
return res.json({
message: 'Invalid session token.',
sessionId,
});
});
module.exports = router;
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