Proyecto ChatBot Con Gemini

ChatbotApi/Constrollers/AuthController.cs

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+// /Controllers/AuthController.cs
+using Microsoft.AspNetCore.Identity;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.IdentityModel.Tokens;
+using System.ComponentModel.DataAnnotations;
+using System.IdentityModel.Tokens.Jwt;
+using System.Security.Claims;
+using System.Text;
+
+public class LoginRequest
+{
+  [Required]
+  [MaxLength(100)]
+  public required string Username { get; set; }
+
+  [Required]
+  [MaxLength(100)]
+  public required string Password { get; set; }
+}
+public class LoginResponse { public required string Token { get; set; } }
+
+[ApiController]
+[Route("api/[controller]")]
+public class AuthController : ControllerBase
+{
+  private readonly IConfiguration _configuration;
+  private readonly UserManager<IdentityUser> _userManager;
+
+  // Inyectamos el UserManager que gestiona los usuarios
+  public AuthController(IConfiguration configuration, UserManager<IdentityUser> userManager)
+  {
+    _configuration = configuration;
+    _userManager = userManager;
+  }
+
+  [HttpPost("login")]
+  public async Task<IActionResult> Login([FromBody] LoginRequest loginRequest)
+  {
+    // Buscamos al usuario por su nombre
+    var user = await _userManager.FindByNameAsync(loginRequest.Username);
+
+    // Verificamos si el usuario existe y si la contraseña es correcta
+    if (user != null && await _userManager.CheckPasswordAsync(user, loginRequest.Password))
+    {
+      var token = GenerateJwtToken(user);
+      return Ok(new LoginResponse { Token = token });
+    }
+
+    return Unauthorized("Credenciales inválidas.");
+  }
+
+  // Método para crear el primer usuario administrador (solo para configuración inicial)
+  [HttpPost("setup-admin")]
+  public async Task<IActionResult> SetupAdminUser()
+  {
+    var adminUser = await _userManager.FindByNameAsync("admin");
+    if (adminUser == null)
+    {
+      adminUser = new IdentityUser
+      {
+        UserName = "admin",
+        Email = "tecnica@eldia.com",
+      };
+      var result = await _userManager.CreateAsync(adminUser, "Diagonal423");
+
+      if (result.Succeeded)
+      {
+        return Ok("Usuario administrador creado exitosamente.");
+      }
+      return BadRequest(result.Errors);
+    }
+    return Ok("El usuario administrador ya existe.");
+  }
+
+  private string GenerateJwtToken(IdentityUser user)
+  {
+    var jwtKey = _configuration["Jwt:Key"] ?? throw new InvalidOperationException("La clave JWT no está configurada.");
+    var securityKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(jwtKey));
+    var credentials = new SigningCredentials(securityKey, SecurityAlgorithms.HmacSha256);
+
+    var claims = new[]
+    {
+            new Claim(JwtRegisteredClaimNames.Sub, user.UserName!),
+            new Claim(JwtRegisteredClaimNames.Jti, Guid.NewGuid().ToString())
+    };
+
+    var token = new JwtSecurityToken(
+        issuer: _configuration["Jwt:Issuer"],
+        audience: _configuration["Jwt:Audience"],
+        claims: claims,
+        expires: DateTime.UtcNow.AddHours(8),
+        signingCredentials: credentials);
+
+    return new JwtSecurityTokenHandler().WriteToken(token);
+  }
+}