Add project files.

TomatenMusic Api/Auth/Services/UserService.cs

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+namespace TomatenMusic_Api.Auth.Services;
+
+using Microsoft.Extensions.Options;
+using Microsoft.IdentityModel.Tokens;
+using System.IdentityModel.Tokens.Jwt;
+using System.Security.Claims;
+using System.Text;
+using TomatenMusic_Api.Auth.Entities;
+using TomatenMusic_Api.Auth.Helpers;
+using TomatenMusic_Api.Auth.Models;
+
+public interface IUserService
+{
+    AuthenticateResponse Authenticate(AuthenticateRequest model);
+    IEnumerable<User> GetAll();
+    User GetById(int id);
+}
+
+public class UserService : IUserService
+{
+    // users hardcoded for simplicity, store in a db with hashed passwords in production applications
+    private List<User> _users = new List<User>
+    {
+        new User { Id = 1, FirstName = "Jannick", LastName = "Voss", Username = "Glowman", Password = "RX5GXstLLBvdt#_N" },
+        new User { Id = 2, FirstName = "Tim", LastName= "M<>ller", Password= "SGWaldsolms9", Username = "Tueem"}
+
+    };
+
+    private readonly AppSettings _appSettings;
+
+    public UserService(IOptions<AppSettings> appSettings)
+    {
+        _appSettings = appSettings.Value;
+    }
+
+    public AuthenticateResponse Authenticate(AuthenticateRequest model)
+    {
+        var user = _users.SingleOrDefault(x => x.Username == model.Username && x.Password == model.Password);
+
+        // return null if user not found
+        if (user == null) return null;
+
+        // authentication successful so generate jwt token
+        var token = generateJwtToken(user);
+
+        return new AuthenticateResponse(user, token);
+    }
+
+    public IEnumerable<User> GetAll()
+    {
+        return _users;
+    }
+
+    public User GetById(int id)
+    {
+        return _users.FirstOrDefault(x => x.Id == id);
+    }
+
+    // helper methods
+
+    private string generateJwtToken(User user)
+    {
+        // generate token that is valid for 7 days
+        var tokenHandler = new JwtSecurityTokenHandler();
+        var key = Encoding.ASCII.GetBytes(_appSettings.Secret);
+        var tokenDescriptor = new SecurityTokenDescriptor
+        {
+            Subject = new ClaimsIdentity(new[] { new Claim("id", user.Id.ToString()) }),
+            Expires = DateTime.UtcNow.AddDays(1),
+            SigningCredentials = new SigningCredentials(new SymmetricSecurityKey(key), SecurityAlgorithms.HmacSha256Signature)
+        };
+        var token = tokenHandler.CreateToken(tokenDescriptor);
+        return tokenHandler.WriteToken(token);
+    }
+}