User Authentication

Ensure secure user authentication to protect user accounts and data. Use a robust authentication service like Firebase Authentication for a seamless and secure user sign-up and login process. Here's a simplified example using Firebase Authentication with JavaScript:

import firebase from 'firebase/app';
import 'firebase/auth';
 
const firebaseConfig = {
  // Your Firebase config here
};
 
firebase.initializeApp(firebaseConfig);
const auth = firebase.auth();
 
// Function to register a new user
function registerUser(email, password) {
  return auth.createUserWithEmailAndPassword(email, password);
}
 
// Function to log in an existing user
function loginUser(email, password) {
  return auth.signInWithEmailAndPassword(email, password);
}
 
// Function to log out the current user
function logoutUser() {
  return auth.signOut();
}
 
// Example usage
const userEmail = 'user@example.com';
const userPassword = 'password123';
 
// Register a new user
registerUser(userEmail, userPassword)
  .then((userCredential) => {
    console.log('User registered:', userCredential.user);
  })
  .catch((error) => console.error('Registration failed', error));
 
// Log in an existing user
loginUser(userEmail, userPassword)
  .then((userCredential) => {
    console.log('User logged in:', userCredential.user);
  })
  .catch((error) => console.error('Login failed', error));
 
// Log out the current user
logoutUser()
  .then(() => {
    console.log('User logged out');
  })
  .catch((error) => console.error('Logout failed', error));

Remember to handle user authentication state changes, secure password handling, and implement proper error handling for production use.

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