feat(auth): Added authentication

backend/src/Services/AuthService.cs

@@ -0,0 +1,67 @@
+using JellyGlass.Exceptions;
+using JellyGlass.Models;
+using JellyGlass.Repositories;
+
+namespace JellyGlass.Services;
+
+public class AuthService : IAuthService
+{
+	private ILoginRepository _loginRepo;
+	private ISessionRepository _sessionRepo;
+
+	public AuthService(ILoginRepository loginRepo, ISessionRepository sessionRepo)
+	{
+		_loginRepo = loginRepo;
+		_sessionRepo = sessionRepo;
+	}
+
+	public async Task<UserSessionDTO> AuthenticateUser(string username, string password)
+	{
+		UserLogin login;
+
+		try
+		{
+			login = await _loginRepo.GetUserLogin(username);
+		}
+		catch (AuthNotFoundException)
+		{
+			throw new LoginFailedException();
+		}
+
+
+		if (BCrypt.Net.BCrypt.Verify(password, login.HashedPassword))
+		{
+			var session = await _sessionRepo.CreateUserSession(login);
+			return new UserSessionDTO(session);
+		}
+		else
+		{
+			throw new LoginFailedException();
+		}
+	}
+
+	public async Task<bool> IsAuthenticated(string? sessionToken)
+	{
+		if (sessionToken == null)
+		{
+			return false;
+		}
+
+		var session = await _sessionRepo.GetUserSession(sessionToken);
+
+		if (session == null)
+		{
+			return false;
+		}
+		else if (session.ExpiresOn < DateTime.Now)
+		{
+			await _sessionRepo.DeleteSession(sessionToken);
+			return false;
+		}
+		else
+		{
+			await _sessionRepo.RefreshSessionExpiry(sessionToken);
+			return true;
+		}
+	}
+}

backend/src/Services/IAuthService.cs

@@ -0,0 +1,9 @@
+using JellyGlass.Models;
+
+namespace JellyGlass.Services;
+
+public interface IAuthService
+{
+	public Task<UserSessionDTO> AuthenticateUser(string username, string password);
+	public Task<bool> IsAuthenticated(string? sessionToken);
+}