tagger/Tagger/Service/UserManager.cs

using Microsoft.AspNetCore.Components.Authorization;
using Microsoft.AspNetCore.Authentication;
using System.Net.NetworkInformation;
using Tagger.Pages;
using System.Security.Claims;
using Microsoft.AspNetCore.Components.Server.ProtectedBrowserStorage;
using System.ComponentModel;

namespace Tagger.Service;

public class UserManager
{
    Configuration Conf;
    ProtectedLocalStorage ProtectedLocalStorage;

    public UserManager(IConfiguration configuration, ProtectedLocalStorage storage)
    {
        Conf = configuration.Get<Configuration>() ?? new();
        ProtectedLocalStorage = storage;
    }

    public async Task<User?> CurrentUser()
    {
        ProtectedBrowserStorageResult<User> ret;

        try
        {
            ret = await ProtectedLocalStorage.GetAsync<User>("logged");
        }
        catch(InvalidOperationException ex) // statically rendered, not logged :)
        {
            return null;
        }
        
        if (!ret.Success)
            return null;

        return ret.Value;
    }

    public async Task<bool> IsLogged()
    {
        return await CurrentUser() is not null;
    }

    public async Task Logout()
    {
        await ProtectedLocalStorage.DeleteAsync("logged");
    }


    public async Task Login(User user)
    {
        await ProtectedLocalStorage.SetAsync("logged", user);
    }

    public async Task<bool> TryLogin(string username, string password)
    {
        await Logout();

        foreach (var user in Conf.Users)
            if (user.Name.ToLower() == username.ToLower())
            {
                if (user.Password != password)
                    return false;

                await Login(user);
                return true;
            }

        return false;
    }

    /*public bool IsLogged(HttpContext state)
    {
        if (state.User is null)
            return false;

        if (state.User.Identity is null)
            return false;

        return state.User.Identity.IsAuthenticated;
    }

    public async Task<bool> IsLogged(AuthenticationStateProvider state)
    {
        AuthenticationState authState = await state.GetAuthenticationStateAsync();

        if (authState.User is null)
            return false;

        if (authState.User.Identity is null)
            return false;

        return authState.User.Identity.IsAuthenticated;
    }

    public async Task<bool> TryLogin(HttpContext state, string username, string password)
    {
        //await Logout(state);

        foreach(var user in Conf.Users)
            if(user.Name.ToLower() == username.ToLower())
            {
                if (user.Password != password)
                    return false;

                await Login(state, user);
                return true;
            }

        return false;
    }

    public async Task<bool> TryLogin(IHostEnvironmentAuthenticationStateProvider state, string username, string password)
    {
        //todo: Logout

        foreach (var user in Conf.Users)
            if (user.Name.ToLower() == username.ToLower())
            {
                if (user.Password != password)
                    return false;

                await Login(state, user);
                return true;
            }

        return false;
    }

    public async Task Login(IHostEnvironmentAuthenticationStateProvider state, User user)
    {
        var claims = new ClaimsPrincipal(new ClaimsIdentity[]
        {
            new ClaimsIdentity(new Claim[]
            {
                new(ClaimTypes.Name, user.Name)
            })
        });
        state.SetAuthenticationState(
            Task.FromResult(
                new AuthenticationState(claims)
                )
            );
    }

    private async Task Login(HttpContext state, User user)
    {
        await state.SignInAsync( new ClaimsPrincipal(new ClaimsIdentity[]
        {
            new ClaimsIdentity(new Claim[]
            {
                new(ClaimTypes.Name, user.Name)
            })
        }));
    }    
    
    public async Task Logout(HttpContext state)
    {
        if (IsLogged(state))
            await state.SignOutAsync();
    }*/


}