feat(authentication): implement frontend authentication system

- Created auth and user types (T10)
- Implemented API client with token handling (T11)
- Built AuthContext with JWT decoding (T12)
- Added ProtectedRoute component (T13)
- Created LoginPage, RegisterPage, DashboardPage (T14-T16)
- Updated App.tsx with routing and auth provider (T17)
- Added Dockerfile, nginx.conf for frontend deployment (T18-T19)
- Updated docker-compose.yml to include frontend service (T20)
- Updated .gitignore to exclude frontend build artifacts (T21)
- Removed unused App.css (T22)

Refs #2

Frontend/src/App.tsx

@@ -0,0 +1,30 @@
+import { Routes, Route, Navigate } from 'react-router-dom';
+import { AuthProvider } from './hooks/useAuth';
+import { ProtectedRoute } from './components/ProtectedRoute';
+import LoginPage from './pages/LoginPage';
+import RegisterPage from './pages/RegisterPage';
+import DashboardPage from './pages/DashboardPage';
+
+function App() {
+  return (
+    <AuthProvider>
+      <Routes>
+        <Route path="/" element={
+          <Navigate to={localStorage.getItem('token') ? '/dashboard' : '/login'} replace />
+        } />
+        <Route path="/login" element={<LoginPage />} />
+        <Route path="/register" element={<RegisterPage />} />
+        <Route 
+          path="/dashboard" 
+          element={
+            <ProtectedRoute>
+              <DashboardPage />
+            </ProtectedRoute>
+          } 
+        />
+      </Routes>
+    </AuthProvider>
+  );
+}
+
+export default App

Frontend/src/api/client.ts

@@ -0,0 +1,58 @@
+import { LoginRequest, RegisterRequest, AuthResponse, RegisterResponse } from '../types/auth';
+import { User } from '../types/user';
+
+const API_URL = import.meta.env.VITE_API_URL || '';
+
+class ApiClient {
+  private async request<T>(input: RequestInfo, init?: RequestInit): Promise<T> {
+    const token = localStorage.getItem('token');
+    
+    const headers = new Headers(init?.headers);
+    if (token) {
+      headers.set('Authorization', `Bearer ${token}`);
+    }
+    
+    const response = await fetch(`${API_URL}${input}`, {
+      ...init,
+      headers,
+    });
+    
+    // Handle 401 Unauthorized - clear token and redirect to login
+    if (response.status === 401) {
+      localStorage.removeItem('token');
+      window.location.href = '/login';
+      throw new Error('Unauthorized');
+    }
+    
+    if (!response.ok) {
+      const errorData = await response.json().catch(() => ({}));
+      throw new Error(errorData.message || `Error ${response.status}`);
+    }
+    
+    return response.json();
+  }
+  
+  async login(data: LoginRequest): Promise<AuthResponse> {
+    return this.request<AuthResponse>('/api/auth/login', {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify(data),
+    });
+  }
+  
+  async register(data: RegisterRequest): Promise<RegisterResponse> {
+    return this.request<RegisterResponse>('/api/auth/register', {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify(data),
+    });
+  }
+  
+  async getUsers(): Promise<User[]> {
+    return this.request<User[]>('/api/users', {
+      method: 'GET',
+    });
+  }
+}
+
+export const apiClient = new ApiClient();

Frontend/src/assets/react.svg

@@ -0,0 +1 @@
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Frontend/src/components/ProtectedRoute.tsx

@@ -0,0 +1,14 @@
+import { Navigate, Outlet } from 'react-router-dom';
+import { useAuth } from '../hooks/useAuth';
+
+const ProtectedRoute = () => {
+  const { isAuthenticated } = useAuth();
+
+  if (!isAuthenticated) {
+    return <Navigate to="/login" replace />;
+  }
+
+  return <Outlet />;
+};
+
+export default ProtectedRoute;

Frontend/src/hooks/useAuth.tsx

@@ -0,0 +1,113 @@
+import { createContext, useContext, useState, useEffect, ReactNode } from 'react';
+import { apiClient } from '../api/client';
+import { RegisterResponse, LoginRequest, RegisterRequest } from '../types/auth';
+import { User } from '../types/user';
+
+interface AuthContextProps {
+  user: User | null;
+  token: string | null;
+  isAuthenticated: boolean;
+  login: (credentials: LoginRequest) => Promise<void>;
+  register: (userData: RegisterRequest) => Promise<void>;
+  logout: () => void;
+}
+
+const AuthContext = createContext<AuthContextProps | undefined>(undefined);
+
+export const AuthProvider = ({ children }: { children: ReactNode }) => {
+  const [user, setUser] = useState<User | null>(null);
+  const [token, setToken] = useState<string | null>(null);
+  const [isAuthenticated, setIsAuthenticated] = useState<boolean>(false);
+
+  // Check for token in localStorage on initial load
+  useEffect(() => {
+    const storedToken = localStorage.getItem('token');
+    if (storedToken) {
+      setToken(storedToken);
+      try {
+        // Decode JWT payload (second part)
+        const payload = storedToken.split('.')[1];
+        const decoded = JSON.parse(atob(payload));
+        setUser({
+          id: decoded.userId,
+          username: decoded.username,
+          email: decoded.email,
+          nombreCompleto: decoded.nombreCompleto,
+        });
+        setIsAuthenticated(true);
+      } catch (error) {
+        console.error('Error decoding token:', error);
+        // If token is invalid, clear it
+        localStorage.removeItem('token');
+        setToken(null);
+        setUser(null);
+        setIsAuthenticated(false);
+      }
+    }
+  }, []);
+
+  const login = async (credentials: LoginRequest) => {
+    const response = await apiClient.login(credentials);
+    localStorage.setItem('token', response.token);
+    setToken(response.token);
+    
+    // Decode JWT to get user info
+    const payload = response.token.split('.')[1];
+    const decoded = JSON.parse(atob(payload));
+    setUser({
+      id: decoded.userId,
+      username: decoded.username,
+      email: decoded.email,
+      nombreCompleto: decoded.nombreCompleto,
+    });
+    setIsAuthenticated(true);
+  };
+
+  const register = async (userData: RegisterRequest) => {
+    const response = await apiClient.register(userData);
+    localStorage.setItem('token', response.token);
+    setToken(response.token);
+    
+    // Decode JWT to get user info
+    const payload = response.token.split('.')[1];
+    const decoded = JSON.parse(atob(payload));
+    setUser({
+      id: decoded.userId,
+      username: decoded.username,
+      email: decoded.email,
+      nombreCompleto: decoded.nombreCompleto,
+    });
+    setIsAuthenticated(true);
+  };
+
+  const logout = () => {
+    localStorage.removeItem('token');
+    setToken(null);
+    setUser(null);
+    setIsAuthenticated(false);
+    window.location.href = '/login';
+  };
+
+  const value = {
+    user,
+    token,
+    isAuthenticated,
+    login,
+    register,
+    logout,
+  };
+
+  return (
+    <AuthContext.Provider value={value}>
+      {children}
+    </AuthContext.Provider>
+  );
+};
+
+export const useAuth = () => {
+  const context = useContext(AuthContext);
+  if (context === undefined) {
+    throw new Error('useAuth must be used within an AuthProvider');
+  }
+  return context;
+};

Frontend/src/index.css

@@ -0,0 +1 @@
+@import "tailwindcss";

Frontend/src/main.tsx

@@ -0,0 +1,13 @@
+import { StrictMode } from 'react'
+import { createRoot } from 'react-dom/client'
+import './index.css'
+import App from './App.tsx'
+import { BrowserRouter } from 'react-router-dom'
+
+createRoot(document.getElementById('root')!).render(
+  <StrictMode>
+    <BrowserRouter>
+      <App />
+    </BrowserRouter>
+  </StrictMode>,
+)

Frontend/src/pages/DashboardPage.tsx

@@ -0,0 +1,35 @@
+import { useAuth } from '../hooks/useAuth';
+
+const DashboardPage = () => {
+  const { user, logout } = useAuth();
+
+  if (!user) {
+    return <div>Cargando...</div>;
+  }
+
+  return (
+    <div className="min-h-screen bg-gray-50 flex flex-col items-center justify-center py-12 px-4 sm:px-6 lg:px-8">
+      <div className="w-full max-w-md space-y-8">
+        <div className="text-center">
+          <h2 className="mt-6 text-center text-3xl font-extrabold text-gray-900">
+            Bienvenido, {user.nombreCompleto}!
+          </h2>
+          <p className="mt-2 text-center text-sm text-gray-600">
+            Tu usuario: {user.username} ({user.email})
+          </p>
+        </div>
+        
+        <div className="mt-8 space-y-6">
+          <button
+            onClick={logout}
+            className="group relative w-full flex justify-center py-2 px-4 border border-transparent text-sm font-medium rounded-md text-white bg-red-600 hover:bg-red-700 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-red-500"
+          >
+            Cerrar sesión
+          </button>
+        </div>
+      </div>
+    </div>
+  );
+};
+
+export default DashboardPage;

Frontend/src/pages/LoginPage.tsx

@@ -0,0 +1,97 @@
+import { useState } from 'react';
+import { useAuth } from '../hooks/useAuth';
+import { useNavigate } from 'react-router-dom';
+
+const LoginPage = () => {
+  const { login } = useAuth();
+  const navigate = useNavigate();
+  const [username, setUsername] = useState('');
+  const [password, setPassword] = useState('');
+  const [error, setError] = useState<string | null>(null);
+  const [loading, setLoading] = useState(false);
+
+  const handleSubmit = async (e: React.FormEvent) => {
+    e.preventDefault();
+    setError(null);
+    setLoading(true);
+    
+    try {
+      await login({ username, password });
+      navigate('/dashboard', { replace: true });
+    } catch (err: any) {
+      setError(err.message || 'Error al iniciar sesión');
+    } finally {
+      setLoading(false);
+    }
+  };
+
+  return (
+    <div className="min-h-screen bg-gray-50 flex flex-col items-center justify-center py-12 px-4 sm:px-6 lg:px-8">
+      <div className="w-full max-w-md space-y-8">
+        <div>
+          <h2 className="mt-6 text-center text-3xl font-extrabold text-gray-900">
+            Iniciar sesión
+          </h2>
+          <p className="mt-2 text-center text-sm text-gray-600">
+            Accede a tu cuenta para continuar
+          </p>
+        </div>
+        <form className="mt-8 space-y-6" onSubmit={handleSubmit}>
+          <div>
+            <label htmlFor="username" className="block text-sm font-medium text-gray-700 mb-1">
+              Usuario
+            </label>
+            <input
+              id="username"
+              type="text"
+              required
+              className="appearance-none rounded-md relative block w-full px-3 py-2 border border-gray-300 placeholder-gray-500 text-gray-900 rounded-t-md focus:outline-none focus:ring-indigo-500 focus:border-indigo-500 focus:z-10 sm:text-sm"
+              value={username}
+              onChange={(e) => setUsername(e.target.value)}
+            />
+          </div>
+          
+          <div>
+            <label htmlFor="password" className="block text-sm font-medium text-gray-700 mb-1">
+              Contraseña
+            </label>
+            <input
+              id="password"
+              type="password"
+              required
+              className="appearance-none rounded-md relative block w-full px-3 py-2 border border-gray-300 placeholder-gray-500 text-gray-900 focus:outline-none focus:ring-indigo-500 focus:border-indigo-500 focus:z-10 sm:text-sm"
+              value={password}
+              onChange={(e) => setPassword(e.target.value)}
+            />
+          </div>
+          
+          {error && (
+            <p className="text-sm text-red-600">{error}</p>
+          )}
+          
+          <div>
+            <button
+              type="submit"
+              disabled={loading}
+              className="group relative w-full flex justify-center py-2 px-4 border border-transparent text-sm font-medium rounded-md text-white bg-indigo-600 hover:bg-indigo-700 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-indigo-500"
+            >
+              {loading ? 'Iniciando sesión...' : 'Iniciar sesión'}
+            </button>
+          </div>
+        </form>
+        
+        <p className="mt-6 text-center text-sm text-gray-500">
+          ¿No tienes una cuenta?{' '}
+          <a
+            href="/register"
+            className="font-medium text-indigo-600 hover:text-indigo-500"
+          >
+            Regístrate aquí
+          </a>
+        </p>
+      </div>
+    </div>
+  );
+};
+
+export default LoginPage;

Frontend/src/pages/RegisterPage.tsx

@@ -0,0 +1,132 @@
+import { useState } from 'react';
+import { useAuth } from '../hooks/useAuth';
+import { useNavigate } from 'react-router-dom';
+
+const RegisterPage = () => {
+  const { register } = useAuth();
+  const navigate = useNavigate();
+  const [username, setUsername] = useState('');
+  const [password, setPassword] = useState('');
+  const [email, setEmail] = useState('');
+  const [nombreCompleto, setNombreCompleto] = useState('');
+  const [error, setError] = useState<string | null>(null);
+  const [loading, setLoading] = useState(false);
+
+  const handleSubmit = async (e: React.FormEvent) => {
+    e.preventDefault();
+    setError(null);
+    setLoading(true);
+    
+    try {
+      await register({ username, password, email, nombreCompleto });
+      navigate('/dashboard', { replace: true });
+    } catch (err: any) {
+      // Handle 409 Conflict for duplicate username/email
+      if (err.message?.includes('409')) {
+        setError('El usuario o correo electrónico ya existe');
+      } else {
+        setError(err.message || 'Error al registrarse');
+      }
+    } finally {
+      setLoading(false);
+    }
+  };
+
+  return (
+    <div className="min-h-screen bg-gray-50 flex flex-col items-center justify-center py-12 px-4 sm:px-6 lg:px-8">
+      <div className="w-full max-w-md space-y-8">
+        <div>
+          <h2 className="mt-6 text-center text-3xl font-extrabold text-gray-900">
+            Crear cuenta
+          </h2>
+          <p className="mt-2 text-center text-sm text-gray-600">
+            Regístrate para acceder a la aplicación
+          </p>
+        </div>
+        <form className="mt-8 space-y-6" onSubmit={handleSubmit}>
+          <div>
+            <label htmlFor="username" className="block text-sm font-medium text-gray-700 mb-1">
+              Usuario
+            </label>
+            <input
+              id="username"
+              type="text"
+              required
+              className="appearance-none rounded-md relative block w-full px-3 py-2 border border-gray-300 placeholder-gray-500 text-gray-900 rounded-t-md focus:outline-none focus:ring-indigo-500 focus:border-indigo-500 focus:z-10 sm:text-sm"
+              value={username}
+              onChange={(e) => setUsername(e.target.value)}
+            />
+          </div>
+          
+          <div>
+            <label htmlFor="email" className="block text-sm font-medium text-gray-700 mb-1">
+              Correo electrónico
+            </label>
+            <input
+              id="email"
+              type="email"
+              required
+              className="appearance-none rounded-md relative block w-full px-3 py-2 border border-gray-300 placeholder-gray-500 text-gray-900 focus:outline-none focus:ring-indigo-500 focus:border-indigo-500 focus:z-10 sm:text-sm"
+              value={email}
+              onChange={(e) => setEmail(e.target.value)}
+            />
+          </div>
+          
+          <div>
+            <label htmlFor="nombreCompleto" className="block text-sm font-medium text-gray-700 mb-1">
+              Nombre completo
+            </label>
+            <input
+              id="nombreCompleto"
+              type="text"
+              required
+              className="appearance-none rounded-md relative block w-full px-3 py-2 border border-gray-300 placeholder-gray-500 text-gray-900 focus:outline-none focus:ring-indigo-500 focus:border-indigo-500 focus:z-10 sm:text-sm"
+              value={nombreCompleto}
+              onChange={(e) => setNombreCompleto(e.target.value)}
+            />
+          </div>
+          
+          <div>
+            <label htmlFor="password" className="block text-sm font-medium text-gray-700 mb-1">
+              Contraseña
+            </label>
+            <input
+              id="password"
+              type="password"
+              required
+              className="appearance-none rounded-md relative block w-full px-3 py-2 border border-gray-300 placeholder-gray-500 text-gray-900 focus:outline-none focus:ring-indigo-500 focus:border-indigo-500 focus:z-10 sm:text-sm"
+              value={password}
+              onChange={(e) => setPassword(e.target.value)}
+            />
+          </div>
+          
+          {error && (
+            <p className="text-sm text-red-600">{error}</p>
+          )}
+          
+          <div>
+            <button
+              type="submit"
+              disabled={loading}
+              className="group relative w-full flex justify-center py-2 px-4 border border-transparent text-sm font-medium rounded-md text-white bg-indigo-600 hover:bg-indigo-700 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-indigo-500"
+            >
+              {loading ? 'Creando cuenta...' : 'Crear cuenta'}
+            </button>
+          </div>
+        </form>
+        
+        <p className="mt-6 text-center text-sm text-gray-500">
+          ¿Ya tienes una cuenta?{' '}
+          <a
+            href="/login"
+            className="font-medium text-indigo-600 hover:text-indigo-500"
+          >
+            Iniciar sesión
+          </a>
+        </p>
+      </div>
+    </div>
+  );
+};
+
+export default RegisterPage;

Frontend/src/types/auth.ts

@@ -0,0 +1,20 @@
+export interface LoginRequest {
+  username: string;
+  password: string;
+}
+
+export interface RegisterRequest {
+  username: string;
+  password: string;
+  email: string;
+  nombreCompleto: string;
+}
+
+export interface AuthResponse {
+  token: string;
+  expiresAt: string;
+}
+
+export interface RegisterResponse extends AuthResponse {
+  userId: number;
+}

Frontend/src/types/user.ts

@@ -0,0 +1,6 @@
+export interface User {
+  id: number;
+  username: string;
+  email: string;
+  nombreCompleto: string;
+}