Add project files.

Services/AuthService.cs

@@ -0,0 +1,80 @@
+using LogisticsApp.Server.Data;
+using LogisticsApp.Server.DTOs;
+using LogisticsApp.Server.Models;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.IdentityModel.Tokens;
+using System.IdentityModel.Tokens.Jwt;
+using System.Security.Claims;
+using System.Text;
+
+namespace LogisticsApp.Server.Services
+{
+    public interface IAuthService
+    {
+        Task<LoginResponse?> LoginAsync(LoginRequest request);
+        string GenerateJwtToken(User user);
+    }
+
+    public class AuthService : IAuthService
+    {
+        private readonly ApplicationDbContext _context;
+        private readonly IConfiguration _configuration;
+
+        public AuthService(ApplicationDbContext context, IConfiguration configuration)
+        {
+            _context = context;
+            _configuration = configuration;
+        }
+
+        public async Task<LoginResponse?> LoginAsync(LoginRequest request)
+        {
+            var user = await _context.Users
+                .FirstOrDefaultAsync(u => u.Username == request.Username);
+
+            if (user == null || !VerifyPassword(request.Password, user.PasswordHash))
+            {
+                return null;
+            }
+
+            var token = GenerateJwtToken(user);
+
+            return new LoginResponse
+            {
+                Token = token,
+                Username = user.Username,
+                Role = user.Role,
+                Expires = DateTime.UtcNow.AddHours(24)
+            };
+        }
+
+        public string GenerateJwtToken(User user)
+        {
+            var key = new SymmetricSecurityKey(
+                Encoding.UTF8.GetBytes(_configuration["Jwt:Key"] ?? throw new InvalidOperationException("JWT Key not configured")));
+
+            var credentials = new SigningCredentials(key, SecurityAlgorithms.HmacSha256);
+
+            var claims = new[]
+            {
+                new Claim(ClaimTypes.NameIdentifier, user.Id.ToString()),
+                new Claim(ClaimTypes.Name, user.Username),
+                new Claim(ClaimTypes.Role, user.Role)
+            };
+
+            var token = new JwtSecurityToken(
+                issuer: _configuration["Jwt:Issuer"],
+                audience: _configuration["Jwt:Audience"],
+                claims: claims,
+                expires: DateTime.UtcNow.AddHours(24),
+                signingCredentials: credentials
+            );
+
+            return new JwtSecurityTokenHandler().WriteToken(token);
+        }
+
+        private static bool VerifyPassword(string password, string passwordHash)
+        {
+            return BCrypt.Net.BCrypt.Verify(password, passwordHash);
+        }
+    }
+}