Added basic login

src/Artemis.UI/Screens/Settings/Tabs/AboutTabView.axaml

@@ -56,8 +56,8 @@
                                  Grid.Column="0"
                                  Grid.RowSpan="3"
                                  VerticalAlignment="Top"
-                                 Height="75"
+                                 Height="40"
-                                 Width="75"
+                                 Width="40"
                                  Margin="0 0 15 0"
                                  IsVisible="{CompiledBinding RobertProfileImage, Converter={x:Static StringConverters.IsNotNullOrEmpty}}"
                                  RenderOptions.BitmapInterpolationMode="HighQuality">

src/Artemis.UI/Screens/Workshop/CurrentUser/CurrentUserView.axaml

@@ -0,0 +1,59 @@
+<UserControl xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+             xmlns:currentUser="clr-namespace:Artemis.UI.Screens.Workshop.CurrentUser"
+             xmlns:avalonia="clr-namespace:Material.Icons.Avalonia;assembly=Material.Icons.Avalonia"
+             xmlns:controls="clr-namespace:FluentAvalonia.UI.Controls;assembly=FluentAvalonia"
+             mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
+             x:Class="Artemis.UI.Screens.Workshop.CurrentUser.CurrentUserView"
+             x:DataType="currentUser:CurrentUserViewModel">
+
+    <Panel>
+        <!-- Signed out -->
+        <Ellipse Height="28" Width="28" IsVisible="{CompiledBinding !IsLoggedIn}">
+            <Ellipse.ContextFlyout>
+                <MenuFlyout>
+                    <MenuItem Header="Login" Command="{CompiledBinding Login}">
+                        <MenuItem.Icon>
+                            <avalonia:MaterialIcon Kind="Login" />
+                        </MenuItem.Icon>
+                    </MenuItem>
+                </MenuFlyout>
+            </Ellipse.ContextFlyout>
+            <Ellipse.Fill>
+                <ImageBrush Source="/Assets/Images/avatar-placeholder.png" />
+            </Ellipse.Fill>
+        </Ellipse>
+
+        <!-- Signed in -->
+        <Ellipse Height="28" Width="28" IsVisible="{CompiledBinding IsLoggedIn}" Name="UserMenu">
+            <Ellipse.ContextFlyout>
+                <Flyout>
+                    <Grid ColumnDefinitions="Auto,*" RowDefinitions="*,*,*" MinWidth="300">
+                        <Ellipse Grid.Column="0" Grid.RowSpan="3" Height="50" Width="50" Margin="0 0 8 0" VerticalAlignment="Top">
+                            <Ellipse.Fill>
+                                <ImageBrush Source="{CompiledBinding Avatar}" />
+                            </Ellipse.Fill>
+                        </Ellipse>
+                        <TextBlock Grid.Column="1" Grid.Row="0" Text="{CompiledBinding Name}" Margin="0 4 0 0"></TextBlock>
+                        <TextBlock Grid.Column="1" Grid.Row="1" Text="{CompiledBinding Email}"></TextBlock>
+                        <controls:HyperlinkButton
+                            Grid.Column="1"
+                            Grid.Row="2"
+                            Margin="-8 0 0 0"
+                            Padding="6 4"
+                            Click="Button_OnClick">
+                            Sign out
+                        </controls:HyperlinkButton>
+                    </Grid>
+                </Flyout>
+            </Ellipse.ContextFlyout>
+            <Ellipse.Fill>
+                <ImageBrush Source="{CompiledBinding Avatar}" />
+            </Ellipse.Fill>
+        </Ellipse>
+    </Panel>
+
+
+</UserControl>

src/Artemis.UI/Screens/Workshop/CurrentUser/CurrentUserView.axaml.cs

@@ -0,0 +1,21 @@
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Interactivity;
+using Avalonia.Markup.Xaml;
+using Avalonia.ReactiveUI;
+
+namespace Artemis.UI.Screens.Workshop.CurrentUser;
+
+public partial class CurrentUserView : ReactiveUserControl<CurrentUserViewModel>
+{
+    public CurrentUserView()
+    {
+        InitializeComponent();
+    }
+
+    private void Button_OnClick(object? sender, RoutedEventArgs e)
+    {
+        UserMenu.ContextFlyout?.Hide();
+        ViewModel?.Logout();
+    }
+}

src/Artemis.UI/Screens/Workshop/CurrentUser/CurrentUserViewModel.cs

@@ -0,0 +1,104 @@
+using System;
+using System.Linq;
+using System.Reactive;
+using System.Reactive.Disposables;
+using System.Threading;
+using System.Threading.Tasks;
+using Artemis.UI.Shared;
+using Artemis.WebClient.Workshop.Services;
+using Avalonia.Media.Imaging;
+using Flurl.Http;
+using ReactiveUI;
+
+namespace Artemis.UI.Screens.Workshop.CurrentUser;
+
+public class CurrentUserViewModel : ActivatableViewModelBase
+{
+    private readonly IAuthenticationService _authenticationService;
+    private ObservableAsPropertyHelper<bool>? _isLoggedIn;
+
+    private string? _userId;
+    private string? _name;
+    private string? _email;
+    private Bitmap? _avatar;
+
+    public CurrentUserViewModel(IAuthenticationService authenticationService)
+    {
+        _authenticationService = authenticationService;
+        Login = ReactiveCommand.CreateFromTask(ExecuteLogin);
+
+        this.WhenActivated(d => _isLoggedIn = _authenticationService.WhenAnyValue(s => s.IsLoggedIn).ToProperty(this, vm => vm.IsLoggedIn).DisposeWith(d));
+        this.WhenActivated(d =>
+        {
+            Task.Run(async () =>
+            {
+                await _authenticationService.AutoLogin();
+                await LoadCurrentUser();
+            }).DisposeWith(d);
+        });
+    }
+
+    public void Logout()
+    {
+        _authenticationService.Logout();
+    }
+
+    public string? UserId
+    {
+        get => _userId;
+        set => RaiseAndSetIfChanged(ref _userId, value);
+    }
+
+    public string? Name
+    {
+        get => _name;
+        set => RaiseAndSetIfChanged(ref _name, value);
+    }
+
+    public string? Email
+    {
+        get => _email;
+        set => RaiseAndSetIfChanged(ref _email, value);
+    }
+
+    public Bitmap? Avatar
+    {
+        get => _avatar;
+        set => RaiseAndSetIfChanged(ref _avatar, value);
+    }
+
+    public ReactiveCommand<Unit, Unit> Login { get; }
+    public bool IsLoggedIn => _isLoggedIn?.Value ?? false;
+
+    private async Task ExecuteLogin(CancellationToken cancellationToken)
+    {
+        await _authenticationService.Login();
+        await LoadCurrentUser();
+        Console.WriteLine(_authenticationService.Claims);
+    }
+
+    private async Task LoadCurrentUser()
+    {
+        if (!IsLoggedIn)
+            return;
+
+        UserId = _authenticationService.Claims.FirstOrDefault(c => c.Type == "sub")?.Value;
+        Name = _authenticationService.Claims.FirstOrDefault(c => c.Type == "name")?.Value;
+        Email = _authenticationService.Claims.FirstOrDefault(c => c.Type == "email")?.Value;
+
+        if (UserId != null)
+            await LoadAvatar(UserId);
+    }
+
+    private async Task LoadAvatar(string userId)
+    {
+        try
+        {
+            Avatar = new Bitmap(await $"{IAuthenticationService.AUTHORITY}/user/avatar/{userId}".GetStreamAsync());
+        }
+        catch (Exception)
+        {
+            // ignored
+        }
+    }
+}

src/Artemis.UI/Screens/Workshop/WorkshopView.axaml

@@ -30,6 +30,7 @@
                     </ListBox.ItemTemplate>
                 </ListBox>
             </Border>
+            <ContentControl Grid.Column="1" VerticalAlignment="Top" HorizontalAlignment="Right" Content="{CompiledBinding CurrentUserViewModel}" Margin="8"></ContentControl>
         </Grid>
     </Border>
 </UserControl>

src/Artemis.UI/Screens/Workshop/WorkshopViewModel.cs

@@ -4,6 +4,7 @@ using System.Reactive;
 using System.Reactive.Linq;
 using System.Threading.Tasks;
 using Artemis.Core;
+using Artemis.UI.Screens.Workshop.CurrentUser;
 using Artemis.UI.Shared.Services;
 using Artemis.UI.Shared.Services.Builders;
 using Artemis.WebClient.Workshop;
@@ -18,8 +19,9 @@ public class WorkshopViewModel : MainScreenViewModel
 {
     private readonly IWorkshopClient _workshopClient;
 
-    public WorkshopViewModel(IScreen hostScreen, IWorkshopClient workshopClient) : base(hostScreen, "workshop")
+    public WorkshopViewModel(IScreen hostScreen, IWorkshopClient workshopClient, CurrentUserViewModel currentUserViewModel) : base(hostScreen, "workshop")
     {
+        CurrentUserViewModel = currentUserViewModel;
         _workshopClient = workshopClient;
         DisplayName = "Workshop";
 
@@ -27,6 +29,7 @@ public class WorkshopViewModel : MainScreenViewModel
     }
 
     public ObservableCollection<IGetEntries_Entries_Nodes> Test { get; set; } = new();
+    public CurrentUserViewModel CurrentUserViewModel { get; set; }
     
     private async Task GetEntries()
     {

src/Artemis.WebClient.Workshop/Artemis.WebClient.Workshop.csproj

@@ -9,6 +9,7 @@
     <ItemGroup>
       <PackageReference Include="DryIoc.dll" Version="5.4.0" />
       <PackageReference Include="DryIoc.Microsoft.DependencyInjection" Version="6.2.0" />
+      <PackageReference Include="IdentityModel" Version="6.1.0" />
       <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="7.0.0" />
       <PackageReference Include="Microsoft.Extensions.Http" Version="7.0.0" />
       <PackageReference Include="StrawberryShake.Server" Version="13.0.5" />
@@ -17,4 +18,8 @@
     <ItemGroup>
       <None Remove=".graphqlconfig" />
     </ItemGroup>
+
+    <ItemGroup>
+      <ProjectReference Include="..\Artemis.Core\Artemis.Core.csproj" />
+    </ItemGroup>
 </Project>

src/Artemis.WebClient.Workshop/DryIoc/ContainerExtensions.cs

@@ -1,5 +1,8 @@
+using Artemis.WebClient.Workshop.Repositories;
+using Artemis.WebClient.Workshop.Services;
 using DryIoc;
 using DryIoc.Microsoft.DependencyInjection;
+using IdentityModel.Client;
 using Microsoft.Extensions.DependencyInjection;
 
 namespace Artemis.WebClient.Workshop.DryIoc;
@@ -21,6 +24,15 @@ public static class ContainerExtensions
             .AddWorkshopClient()
             .ConfigureHttpClient(client => client.BaseAddress = new Uri("https://localhost:7281/graphql"));
 
+        serviceCollection.AddSingleton<IDiscoveryCache>(r =>
+        {
+            IHttpClientFactory factory = r.GetRequiredService<IHttpClientFactory>();
+            return new DiscoveryCache(IAuthenticationService.AUTHORITY, () => factory.CreateClient());
+        });
+
         container.WithDependencyInjectionAdapter(serviceCollection);
+
+        container.Register<IAuthenticationRepository, AuthenticationRepository>(Reuse.Singleton);
+        container.Register<IAuthenticationService, AuthenticationService>(Reuse.Singleton);
     }
 }

src/Artemis.WebClient.Workshop/Entities/RefreshTokenEntity.cs

@@ -0,0 +1,7 @@
+namespace Artemis.WebClient.Workshop.Entities;
+
+public class RefreshTokenEntity
+{
+    public string RefreshToken { get; set; }
+    
+}

src/Artemis.WebClient.Workshop/Exceptions/ArtemisWebClientException.cs

@@ -0,0 +1,24 @@
+using System;
+
+namespace Artemis.Core;
+
+/// <summary>
+///     An exception thrown when a web client related error occurs
+/// </summary>
+public class ArtemisWebClientException : Exception
+{
+    /// <inheritdoc />
+    public ArtemisWebClientException()
+    {
+    }
+
+    /// <inheritdoc />
+    public ArtemisWebClientException(string? message) : base(message)
+    {
+    }
+
+    /// <inheritdoc />
+    public ArtemisWebClientException(string? message, Exception? innerException) : base(message, innerException)
+    {
+    }
+}

src/Artemis.WebClient.Workshop/Repositories/AuthenticationRepository.cs

@@ -0,0 +1,36 @@
+using Artemis.WebClient.Workshop.Entities;
+using LiteDB;
+
+namespace Artemis.WebClient.Workshop.Repositories;
+
+internal class AuthenticationRepository : IAuthenticationRepository
+{
+    private readonly LiteRepository _repository;
+
+    public AuthenticationRepository(LiteRepository repository)
+    {
+        _repository = repository;
+        _repository.Database.GetCollection<RefreshTokenEntity>().EnsureIndex(s => s.RefreshToken);
+    }
+
+    /// <inheritdoc />
+    public void SetRefreshToken(string? refreshToken)
+    {
+        _repository.Database.GetCollection<RefreshTokenEntity>().DeleteAll();
+
+        if (refreshToken != null)
+            _repository.Insert(new RefreshTokenEntity {RefreshToken = refreshToken});
+    }
+
+    /// <inheritdoc />
+    public string? GetRefreshToken()
+    {
+        return _repository.Query<RefreshTokenEntity>().FirstOrDefault()?.RefreshToken;
+    }
+}
+
+internal interface IAuthenticationRepository
+{
+    void SetRefreshToken(string? refreshToken);
+    string? GetRefreshToken();
+}

src/Artemis.WebClient.Workshop/Services/AccessToken.cs

@@ -0,0 +1,25 @@
+using Artemis.Core;
+using IdentityModel.Client;
+
+namespace Artemis.WebClient.Workshop.Services;
+
+internal class AuthenticationToken
+{
+    public AuthenticationToken(TokenResponse tokenResponse)
+    {
+        if (tokenResponse.AccessToken == null)
+            throw new ArtemisWebClientException("Token response contains no access token");
+        if (tokenResponse.RefreshToken == null)
+            throw new ArtemisWebClientException("Token response contains no refresh token");
+
+        AccessToken = tokenResponse.AccessToken;
+        RefreshToken = tokenResponse.RefreshToken;
+        ExpiresAt = DateTimeOffset.UtcNow.AddSeconds(tokenResponse.ExpiresIn);
+    }
+
+    public DateTimeOffset ExpiresAt { get; private set; }
+    public bool Expired => DateTimeOffset.UtcNow.AddSeconds(5) >= ExpiresAt;
+
+    public string AccessToken { get; private set; }
+    public string RefreshToken { get; private set; }
+}

src/Artemis.WebClient.Workshop/Services/IAuthenticationService.cs

@@ -0,0 +1,222 @@
+using System.Collections.ObjectModel;
+using System.Diagnostics;
+using System.Security.Claims;
+using Artemis.Core;
+using Artemis.Core.Services;
+using Artemis.WebClient.Workshop.Repositories;
+using IdentityModel;
+using IdentityModel.Client;
+
+namespace Artemis.WebClient.Workshop.Services;
+
+public interface IAuthenticationService : IProtectedArtemisService
+{
+    public const string AUTHORITY = "https://localhost:5001";
+    
+    bool IsLoggedIn { get; }
+    string? UserCode { get; }
+    ReadOnlyObservableCollection<Claim> Claims { get; }
+
+    Task<string?> GetBearer();
+    Task<bool> AutoLogin();
+    Task<bool> Login();
+    void Logout();
+}
+
+internal class AuthenticationService : CorePropertyChanged, IAuthenticationService
+{
+    internal const string CLIENT_ID = "artemis.desktop";
+
+    private readonly IDiscoveryCache _discoveryCache;
+    private readonly IAuthenticationRepository _authenticationRepository;
+    private readonly IHttpClientFactory _httpClientFactory;
+    private readonly ObservableCollection<Claim> _claims = new();
+    private readonly SemaphoreSlim _bearerLock = new(1);
+
+    private AuthenticationToken? _token;
+    private string? _userCode;
+    private bool _isLoggedIn;
+
+    public AuthenticationService(IHttpClientFactory httpClientFactory, IDiscoveryCache discoveryCache, IAuthenticationRepository authenticationRepository)
+    {
+        _httpClientFactory = httpClientFactory;
+        _discoveryCache = discoveryCache;
+        _authenticationRepository = authenticationRepository;
+
+        Claims = new ReadOnlyObservableCollection<Claim>(_claims);
+    }
+
+    /// <inheritdoc />
+    public bool IsLoggedIn
+    {
+        get => _isLoggedIn;
+        private set => SetAndNotify(ref _isLoggedIn, value);
+    }
+
+    /// <inheritdoc />
+    public string? UserCode
+    {
+        get => _userCode;
+        private set => SetAndNotify(ref _userCode, value);
+    }
+
+    /// <inheritdoc />
+    public ReadOnlyObservableCollection<Claim> Claims { get; }
+
+    public async Task<string?> GetBearer()
+    {
+        await _bearerLock.WaitAsync();
+
+        try
+        {
+            // If not logged in, attempt to auto login first
+            if (!IsLoggedIn)
+                await AutoLogin();
+
+            if (_token == null)
+                return null;
+
+            // If the token is expiring, refresh it
+            if (_token.Expired && !await UseRefreshToken(_token.RefreshToken))
+                return null;
+
+            return _token.AccessToken;
+        }
+        finally
+        {
+            _bearerLock.Release();
+        }
+    }
+
+    /// <inheritdoc />
+    public async Task<bool> AutoLogin()
+    {
+        if (IsLoggedIn)
+            return true;
+        
+        string? refreshToken = _authenticationRepository.GetRefreshToken();
+        if (refreshToken == null)
+            return false;
+
+        return await UseRefreshToken(refreshToken);
+    }
+
+    /// <inheritdoc />
+    public async Task<bool> Login()
+    {
+        DiscoveryDocumentResponse disco = await GetDiscovery();
+        HttpClient client = _httpClientFactory.CreateClient();
+        DeviceAuthorizationResponse response = await client.RequestDeviceAuthorizationAsync(new DeviceAuthorizationRequest
+        {
+            Address = disco.DeviceAuthorizationEndpoint,
+            ClientId = CLIENT_ID
+        });
+        if (response.IsError)
+            throw new ArtemisWebClientException("Failed to request device authorization: " + response.Error);
+        if (response.DeviceCode == null)
+            throw new ArtemisWebClientException("Failed to request device authorization: Got no device code");
+
+        DateTimeOffset timeout = DateTimeOffset.UtcNow.AddSeconds(response.ExpiresIn ?? 1800);
+
+        Process.Start(new ProcessStartInfo {FileName = response.VerificationUriComplete, UseShellExecute = true});
+        await Task.Delay(TimeSpan.FromSeconds(response.Interval));
+        while (DateTimeOffset.UtcNow < timeout)
+        {
+            bool success = await AttemptRequestDeviceToken(client, response.DeviceCode);
+            if (success)
+                return true;
+            await Task.Delay(TimeSpan.FromSeconds(response.Interval));
+        }
+
+        return false;
+    }
+
+    /// <inheritdoc />
+    public void Logout()
+    {
+        _token = null;
+        _claims.Clear();
+        _authenticationRepository.SetRefreshToken(null);
+        
+        IsLoggedIn = false;
+    }
+
+    private async Task<DiscoveryDocumentResponse> GetDiscovery()
+    {
+        DiscoveryDocumentResponse disco = await _discoveryCache.GetAsync();
+        if (disco.IsError)
+            throw new ArtemisWebClientException("Failed to retrieve discovery document: " + disco.Error);
+
+        return disco;
+    }
+
+    private async Task<bool> AttemptRequestDeviceToken(HttpClient client, string deviceCode)
+    {
+        DiscoveryDocumentResponse disco = await GetDiscovery();
+        TokenResponse response = await client.RequestDeviceTokenAsync(new DeviceTokenRequest
+        {
+            Address = disco.TokenEndpoint,
+            ClientId = CLIENT_ID,
+            DeviceCode = deviceCode
+        });
+
+        if (response.IsError)
+        {
+            if (response.Error == OidcConstants.TokenErrors.AuthorizationPending || response.Error == OidcConstants.TokenErrors.SlowDown)
+                return false;
+
+            throw new ArtemisWebClientException("Failed to request device token: " + response.Error);
+        }
+
+        await SetCurrentUser(client, response);
+        return true;
+    }
+
+    private async Task SetCurrentUser(HttpClient client, TokenResponse response)
+    {
+        _token = new AuthenticationToken(response);
+        _authenticationRepository.SetRefreshToken(_token.RefreshToken);
+
+        await GetUserInfo(client, _token.AccessToken);
+        IsLoggedIn = true;
+    }
+
+    private async Task GetUserInfo(HttpClient client, string accessToken)
+    {
+        DiscoveryDocumentResponse disco = await GetDiscovery();
+        UserInfoResponse response = await client.GetUserInfoAsync(new UserInfoRequest()
+        {
+            Address = disco.UserInfoEndpoint,
+            Token = accessToken
+        });
+        if (response.IsError)
+            throw new ArtemisWebClientException("Failed to retrieve user info: " + response.Error);
+
+        _claims.Clear();
+        foreach (Claim responseClaim in response.Claims)
+            _claims.Add(responseClaim);
+    }
+
+    private async Task<bool> UseRefreshToken(string refreshToken)
+    {
+        DiscoveryDocumentResponse disco = await GetDiscovery();
+        HttpClient client = _httpClientFactory.CreateClient();
+        TokenResponse response = await client.RequestRefreshTokenAsync(new RefreshTokenRequest()
+        {
+            Address = disco.TokenEndpoint,
+            ClientId = CLIENT_ID,
+            RefreshToken = refreshToken
+        });
+
+        if (response.IsError)
+        {
+            if (response.Error == OidcConstants.TokenErrors.ExpiredToken)
+                return false;
+
+            throw new ArtemisWebClientException("Failed to request refresh token: " + response.Error);
+        }
+
+        await SetCurrentUser(client, response);
+        return false;
+    }
+}