/**
* ROLE: EXECUTABLE
* CONNECTED VIA: CommonJS module export
* PURPOSE: User authentication and session management
* FAILURE MODES: Duplicate registration throws error, invalid credentials throw error, expired sessions throw error
*
* Authority: 01-javascript-strings.md
*/
// JavaScript User Authentication Service
const crypto = require('crypto');
class AuthenticationService {
constructor() {
this.users = new Map();
this.sessions = new Map();
}
registerUser(email, password) {
if (this.users.has(email)) {
throw new Error('User already exists');
}
const hashedPassword = crypto.createHash('sha256').update(password).digest('hex');
const user = {
id: crypto.randomUUID(),
email,
password: hashedPassword,
createdAt: new Date(),
isActive: true
};
this.users.set(email, user);
return user;
}
authenticateUser(email, password) {
const user = this.users.get(email);
if (!user) {
throw new Error('User not found');
}
const hashedPassword = crypto.createHash('sha256').update(password).digest('hex');
if (user.password !== hashedPassword) {
throw new Error('Invalid password');
}
return user;
}
createSession(user) {
const sessionId = crypto.randomUUID();
const session = {
userId: user.id,
email: user.email,
createdAt: new Date(),
expiresAt: new Date(Date.now() + 24 * 60 * 60 * 1000),
isValid: true
};
this.sessions.set(sessionId, session);
return sessionId;
}
validateSession(sessionId) {
const session = this.sessions.get(sessionId);
if (!session) {
throw new Error('Session not found');
}
if (!session.isValid || session.expiresAt < new Date()) {
throw new Error('Session expired or invalid');
}
return session;
}
logout(sessionId) {
const session = this.sessions.get(sessionId);
if (!session) {
throw new Error('Session not found');
}
session.isValid = false;
return true;
}
}
module.exports = AuthenticationService;
