Implement Secure Email-Based Authentication System

lib/auth-utils.ts

@@ -0,0 +1,36 @@
+import { LoginCredentials, RegisterCredentials } from '../types/auth';
+
+export const validateEmail = (email: string): boolean => {
+  const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
+  return emailRegex.test(email);
+};
+
+export const validatePassword = (password: string): boolean => {
+  // At least 8 characters, one uppercase, one lowercase, one number
+  const passwordRegex = /^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)[a-zA-Z\d]{8,}$/;
+  return passwordRegex.test(password);
+};
+
+export const validateLoginCredentials = (credentials: LoginCredentials): string[] => {
+  const errors: string[] = [];
+
+  if (!validateEmail(credentials.email)) {
+    errors.push('Invalid email format');
+  }
+
+  if (!validatePassword(credentials.password)) {
+    errors.push('Password must be at least 8 characters, include uppercase, lowercase, and number');
+  }
+
+  return errors;
+};
+
+export const validateRegisterCredentials = (credentials: RegisterCredentials): string[] => {
+  const errors = validateLoginCredentials(credentials);
+
+  if (credentials.password !== credentials.confirmPassword) {
+    errors.push('Passwords do not match');
+  }
+
+  return errors;
+};