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const base64 = require('base-64');
const sha512 = require('js-sha512');
const shortid = require('shortid');
const db = require('./db');
const owaspPw = require('owasp-password-strength-test');
const buildSessionCookie = ({ username, sessionToken, isLogout }) => {
if (!isLogout) {
const tokenData = {
username,
sessionToken,
};
const tokenDataStr = JSON.stringify(tokenData);
const encodedToken = base64.encode(tokenDataStr);
return `sessionCookie=${encodedToken}; Domain=localhost; HttpOnly; SameSite=strict;`;
} else {
return `sessionCookie=deleted; Domain=localhost; Expires=Thu, 01 Jan 1970 00:00:00 GMT; HttpOnly; SameSite=strict;`;
}
};
const authMiddleware = async (req, res, next) => {
const cookies = req.cookies;
const encodedCookie = cookies.sessionCookie;
if (!encodedCookie) {
res.status(403);
return res.json({
message: 'Log in first!',
});
}
const sessionCookieStr = base64.decode(encodedCookie);
const sessionCookie = JSON.parse(sessionCookieStr);
const { username, sessionToken } = sessionCookie;
const user = await db('users').where({ username }).first();
if (!user) {
res.status(400);
res.set('Set-Cookie', buildSessionCookie({ isLogout: true }));
return res.json({
message: 'Invalid session token.',
sessionCookie,
});
}
const salt = user.salt;
const sessionTokenHash = sha512(salt + sessionToken);
const token = await db('tokens').where({ type: 'session', value: sessionTokenHash });
if (!token) {
res.status(400);
res.set('Set-Cookie', buildSessionCookie({ isLogout: true }));
return res.json({
message: 'Invalid session token.',
sessionCookie,
});
}
req.sessionTokenHash = sessionTokenHash;
req.user = user;
next();
};
const registerRoute = async (req, res) => {
const { username, password } = req.body;
if (!username || !password) {
res.status(400);
return res.json({
error: 'Username or password missing.',
});
}
const existingUser = await db('users').where({ username }).first();
if (existingUser) {
res.status(400);
return res.json({
error: 'Username already taken.',
});
}
let validationErrors = [];
const usernameMinLength = 5;
const usernameMaxLength = 20;
if (username.length < usernameMinLength) {
validationErrors.push(`Username must be at least ${usernameMinLength} characters long.`);
}
if (username.length > usernameMaxLength) {
validationErrors.push(`Username must be at most ${usernameMaxLength} characters long.`);
}
const owaspPwTestResults = owaspPw.test(password);
if (!owaspPwTestResults.strong) {
validationErrors = validationErrors.concat(owaspPwTestResults.errors);
}
if (validationErrors.length > 0) {
res.status(400);
return res.json({
errors: validationErrors,
});
}
const salt = shortid.generate();
const pwHash = sha512(salt + password);
const sessionToken = shortid.generate();
const sessionTokenHash = sha512(salt + sessionToken);
const user = (await db('users').insert({ username, password: pwHash, salt }).returning('*'))[0];
await db('tokens').insert({ user_id: user.id, type: 'session', value: sessionTokenHash });
res.set('Set-Cookie', buildSessionCookie({ username, sessionToken, remember: false, isLogout: false }));
return res.json({
username,
});
};
const loginRoute = 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();
const salt = user.salt;
const pwHash = sha512(salt + password);
if (!user || pwHash !== user.password) {
res.status(400);
res.json({
error: 'Wrong username or password',
});
}
const sessionToken = shortid.generate();
const sessionTokenHash = sha512(user.salt + sessionToken);
await db('tokens').insert({ user_id: user.id, type: 'session', value: sessionTokenHash });
res.set('Set-Cookie', buildSessionCookie({ username, sessionToken, remember, isLogout: false }));
return res.json({
username,
});
};
const logoutRoute = async (req, res) => {
await db('tokens').where({ type: 'session', user_id: req.user.id, value: req.sessionTokenHash }).delete();
res.status(204);
res.set('Set-Cookie', buildSessionCookie({ isLogout: true }));
res.send();
};
module.exports = {
buildSessionCookie,
authMiddleware,
registerRoute,
loginRoute,
logoutRoute,
};
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