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using Microsoft.AspNetCore.Cryptography.KeyDerivation;
namespace HyperBooru.Services;
public interface IUserService {
public UserSessionState UserSessionState { get; }
}
public class UserService : IUserService {
public UserSessionState UserSessionState =>
globalUserService.GetSessionState(httpContext.Session.Id);
private IHttpContextAccessor httpContextAccessor;
private IGlobalUserService globalUserService;
private HttpContext httpContext =>
httpContextAccessor.HttpContext!;
public UserService(
IHttpContextAccessor httpContextAccessor,
IGlobalUserService globalUserService) {
this.httpContextAccessor = httpContextAccessor;
this.globalUserService = globalUserService;
// HTTP context session states are discarded if no values
// are set. Set a dummy value so that the session state
// will not be discarded later when we actually need it.
httpContext.Session.SetInt32("Persist", 1);
}
public static string HashPassword(string password) =>
Convert.ToBase64String(
KeyDerivation.Pbkdf2(
password,
Array.Empty<byte>(),
KeyDerivationPrf.HMACSHA512,
100_000,
512 / 8));
}
public interface IGlobalUserService {
public UserSessionState GetSessionState(string id);
}
public class GlobalUserService : IGlobalUserService {
// TODO: prune this list periodically
private Dictionary<string, UserSessionState> sessionStates = new();
public UserSessionState GetSessionState(string id) {
sessionStates.TryGetValue(id, out var state);
if(state is null) {
state = new();
sessionStates[id] = state;
}
return state;
}
}
public record UserSessionState {
public event UserSessionStateChange OnStateChange;
public bool ShowNsfw {
get => showNsfw;
set {
showNsfw = value;
OnStateChange.Invoke(this);
}
}
private bool showNsfw = false;
}
public delegate void UserSessionStateChange(UserSessionState sessionState);
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