Add JWT authentication with AuthController and services

backend/Services/JwtTokenService.cs

@@ -0,0 +1,43 @@
+using System.IdentityModel.Tokens.Jwt;
+using System.Security.Claims;
+using System.Text;
+using Microsoft.IdentityModel.Tokens;
+using RacePlannerApi.Models;
+
+namespace RacePlannerApi.Services;
+
+public class JwtTokenService
+{
+    private readonly IConfiguration _configuration;
+
+    public JwtTokenService(IConfiguration configuration)
+    {
+        _configuration = configuration;
+    }
+
+    public string GenerateToken(User user)
+    {
+        var securityKey = new SymmetricSecurityKey(
+            Encoding.UTF8.GetBytes(_configuration["Jwt:Key"] ?? "your-secret-key-here-minimum-32-characters-long"));
+        var credentials = new SigningCredentials(securityKey, SecurityAlgorithms.HmacSha256);
+
+        var claims = new[]
+        {
+            new Claim(JwtRegisteredClaimNames.Sub, user.Id.ToString()),
+            new Claim(JwtRegisteredClaimNames.Email, user.Email),
+            new Claim(JwtRegisteredClaimNames.Name, user.Name),
+            new Claim("role", user.Role.ToString()),
+            new Claim(JwtRegisteredClaimNames.Jti, Guid.NewGuid().ToString())
+        };
+
+        var token = new JwtSecurityToken(
+            issuer: _configuration["Jwt:Issuer"] ?? "RacePlannerApi",
+            audience: _configuration["Jwt:Audience"] ?? "RacePlannerClient",
+            claims: claims,
+            expires: DateTime.Now.AddHours(24),
+            signingCredentials: credentials
+        );
+
+        return new JwtSecurityTokenHandler().WriteToken(token);
+    }
+}