setup a fake nostr service to generate random events

All.sln

@@ -6,6 +6,7 @@ MinimumVisualStudioVersion = 10.0.40219.1
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution Items", "{B82E3B66-170C-4AE0-8591-B03CE3B49C6C}"
 	ProjectSection(SolutionItems) = preProject
 		.editorconfig = .editorconfig
+		Bogus.Premium.LicenseKey = Bogus.Premium.LicenseKey
 		.github\workflows\main.yml = .github\workflows\main.yml
 		README.md = README.md
 	EndProjectSection

src/NuSocial/GlobalSetting.cs

@@ -28,6 +28,8 @@ public User CurrentUser
             }
         }
 
+        public bool DemoMode { get; set; }
+
         private static void UpdateUser(NostrPublicKey publicKey, NostrPrivateKey? privateKey)
         {
             if (privateKey != null)

src/NuSocial/MauiProgram.cs

@@ -144,7 +144,12 @@ private static ContainerBuilder GetAutofacContainerBuilder(IServiceCollection se
         var db = new LocalStorage();
         services.AddSingleton<IDatabase>(db);
         services.AddSingleton<ICustomDispatcher, MauiDispatcher>();
+
+#if DEBUG
+        services.AddSingleton<INostrService>(new TestNostrService());
+#else
         services.AddSingleton<INostrService>(new NostrService(db));
+#endif
         services.AddLocalization();
         services.AddLogging(logging => logging.AddSerilog());
 

src/NuSocial/NuSocial.csproj

@@ -56,6 +56,11 @@
 	<ItemGroup>
 		<PackageReference Include="Ben.Demystifier" Version="0.4.1" />
 		<PackageReference Include="BindableProps" Version="1.3.7" />
+		<PackageReference Include="Bogus" Version="34.0.2" />
+		<PackageReference Include="Bogus.Tools.Analyzer" Version="34.0.2">
+		  <PrivateAssets>all</PrivateAssets>
+		  <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+		</PackageReference>
 		<PackageReference Include="CommunityToolkit.Maui" Version="5.1.0" />
 		<PackageReference Include="CommunityToolkit.Maui.Markup" Version="3.1.0" />
 		<PackageReference Include="CommunityToolkit.MVVM" Version="8.2.0" />

src/NuSocial/Services/NostrService.cs

@@ -1,4 +1,5 @@
-using CommunityToolkit.Mvvm.Messaging;
+using Bogus;
+using CommunityToolkit.Mvvm.Messaging;
 using Microsoft.Extensions.Logging.Abstractions;
 using Nostr.Client.Client;
 using Nostr.Client.Communicator;
@@ -403,4 +404,185 @@ private Task<NostrMetadataEvent> GetFollowingInfoAsync(string publicKey, Cancell
             throw new NotImplementedException();
         }
     }
+
+    public class TestNostrService : INostrService, IDisposable
+    {
+        private bool _isDisposed;
+        private readonly Faker<NostrEvent> _nostrFaker;
+        private readonly Faker<Profile> _profileFaker;
+        private Timer? _timer;
+
+        public TestNostrService()
+        {
+            var faker = new Faker();
+            List<NostrKeyPair> authorPool = new List<NostrKeyPair>();
+            for (int i = 0; i < faker.Random.Int(10, 100); i++)
+            {
+                var keyPair = NostrKeyPair.GenerateNew();
+                authorPool.Add(keyPair);
+            }
+            _nostrFaker = new Faker<NostrEvent>()
+                .RuleFor(n => n.Pubkey, f => authorPool[f.UniqueIndex % authorPool.Count].PublicKey.Bech32)
+                .RuleFor(n => n.CreatedAt, f => f.Date.Recent(f.Random.Int(1, 7)))
+                .RuleFor(n => n.Kind, f => NostrKind.ShortTextNote)
+                .RuleFor(n => n.Tags, f => default)
+                .RuleFor(n => n.Content, f => TestNostrService.GenerateRandomMarkdownContent(f))
+                .RuleFor(n => n.Id, (f, n) => n.ComputeId())
+                .RuleFor(n => n.Sig, (f, n) =>
+                {
+                    var index = f.UniqueIndex % authorPool.Count;
+                    var keyPair = authorPool[index];
+                    var sig = n.ComputeSignature(keyPair.PrivateKey);
+                    return sig;
+                })
+                .FinishWith((f, e) =>
+                {
+                    Console.WriteLine("Content event generated! Id={0}", e.Id);
+                });
+
+            _profileFaker = new Faker<Profile>()
+                .RuleFor(p => p.Name, f => f.Internet.UserName())
+                .RuleFor(p => p.DisplayName, f => f.Random.Bool(0.2f) ? f.Internet.UserName() : null)
+                .RuleFor(p => p.Picture, f => f.Random.Bool(0.8f) ? f.Internet.Avatar() : null)
+                .RuleFor(p => p.Relays, f => default);
+        }
+
+        private static string GenerateRandomMarkdownContent(Faker faker)
+        {
+            var markdownContent = $"{string.Join(" ", faker.Lorem.Words(faker.Random.Int(1,3)))}\n\n";
+            var hasSomethingInteresting = false;
+            if (!hasSomethingInteresting && faker.Random.Bool(0.05f))
+            {
+                for (var i = 0; i < faker.Random.Int(1, 3); i++)
+                {
+                    markdownContent += $"{faker.Lorem.Paragraph()}\n\n";
+                }
+                hasSomethingInteresting = true;
+            }
+
+            // Add a list
+            if (!hasSomethingInteresting && faker.Random.Bool(0.05f))
+            {
+                markdownContent += "## List\n\n";
+                for (var i = 0; i < faker.Random.Int(2, 5); i++)
+                {
+                    markdownContent += $"* {faker.Lorem.Sentence()}\n";
+                }
+                hasSomethingInteresting = true;
+                if (faker.Random.Bool(0.05f))
+                {
+                    hasSomethingInteresting = false;
+                }
+            }
+
+            // Add a quote
+            if (!hasSomethingInteresting && faker.Random.Bool(0.05f))
+            {
+                markdownContent += "\n> " + faker.Lorem.Sentence() + "\n\n";
+                hasSomethingInteresting = true;
+                if (faker.Random.Bool(0.05f))
+                {
+                    hasSomethingInteresting = false;
+                }
+            }
+
+            // Add a code block
+            if (!hasSomethingInteresting && faker.Random.Bool(0.05f))
+            {
+                markdownContent += "```\n" + faker.Lorem.Sentence() + "\n```\n\n";
+                hasSomethingInteresting = true;
+                if (faker.Random.Bool(0.05f))
+                {
+                    hasSomethingInteresting = false;
+                }
+            }
+
+            // Add a table
+            if (!hasSomethingInteresting && faker.Random.Bool(0.05f))
+            {
+                markdownContent += "| Column 1 | Column 2 |\n| -------- | -------- |\n";
+                for (var i = 0; i < faker.Random.Int(2, 5); i++)
+                {
+                    markdownContent += $"| {faker.Lorem.Word()} | {faker.Lorem.Word()} |\n";
+                }
+                hasSomethingInteresting = true;
+                if (faker.Random.Bool(0.05f))
+                {
+                    hasSomethingInteresting = false;
+                }
+            }
+
+            // Add an emoji
+            if (!hasSomethingInteresting && faker.Random.Bool(0.30f))
+            {
+                var emojis = new[] { "😀", "😃", "😄", "😁", "😆", "😅", "😂", "🤣", "😊", "😇" };
+                markdownContent += "\n" + faker.PickRandom(emojis) + "\n";
+                hasSomethingInteresting = true;
+                if (faker.Random.Bool(0.05f))
+                {
+                    hasSomethingInteresting = false;
+                }
+            }
+
+            return markdownContent;
+        }
+
+        public NostrClientStreams? Streams => throw new NotImplementedException();
+
+
+        public Task<Profile> GetProfileAsync(string publicKey, CancellationToken cancellationToken)
+        {
+            cancellationToken.ThrowIfCancellationRequested();
+            return Task.FromResult(_profileFaker.Generate());
+        }
+
+        public void RegisterFilter(string subscription, NostrFilter filter)
+        {
+            // Do nothing
+        }
+
+        public void StartNostr()
+        {
+            var faker = new Faker();
+            _timer = new Timer(SendNostrPostMessage, null, 0, faker.Random.Int(1000, 5000));
+        }
+
+        private void SendNostrPostMessage(object? state)
+        {
+            var nostrEvent = _nostrFaker.Generate();
+            var message = new NostrPostMessage(nostrEvent);
+            WeakReferenceMessenger.Default.Send(message);
+        }
+
+        public void StopNostr()
+        {
+            _timer?.Dispose();
+        }
+
+        protected virtual void Dispose(bool disposing)
+        {
+            if (!_isDisposed)
+            {
+                if (disposing)
+                {
+                    _timer?.Dispose();
+                }
+
+                _isDisposed = true;
+            }
+        }
+
+        ~TestNostrService()
+        {
+            // Do not change this code. Put cleanup code in 'Dispose(bool disposing)' method
+            Dispose(disposing: false);
+        }
+
+        public void Dispose()
+        {
+            // Do not change this code. Put cleanup code in 'Dispose(bool disposing)' method
+            Dispose(disposing: true);
+            GC.SuppressFinalize(this);
+        }
+    }
 }

src/NuSocial/ViewModels/LoginViewModel.cs

@@ -29,6 +29,20 @@ public LoginViewModel(IDialogService dialogService,
     }
 
     public bool IsAccountKeyValid => !string.IsNullOrEmpty(AccountKey);
+    [RelayCommand(CanExecute = nameof(IsNotBusy))]
+    private Task DemoAsync()
+    {
+        return SetBusyAsync(async () =>
+        {
+            var keyPair = NostrKeyPair.GenerateNew();
+
+            var user = new User() { PublicKey = keyPair.PublicKey, PrivateKey = keyPair.PrivateKey };
+            await _db.UpdateUsersAsync(new ObservableCollection<User> { user });
+            GlobalSetting.Instance.DemoMode = true;
+            GlobalSetting.Instance.CurrentUser = user;
+            await Navigation.NavigateTo("//main", user);
+        });
+    }
 
     [RelayCommand(CanExecute = nameof(IsNotBusy))]
     private Task LoginAsync()

src/NuSocial/ViewModels/MainViewModel.cs

@@ -12,6 +12,7 @@ namespace NuSocial.ViewModels;
 public partial class MainViewModel : BaseViewModel, ITransientDependency, IDisposable
 {
     private readonly IAuthorService _authorService;
+    private readonly INostrService _nostrService;
     private CancellationTokenSource? _cts = new();
     private const int _postThreshold = 100;
 
@@ -26,16 +27,23 @@ public partial class MainViewModel : BaseViewModel, ITransientDependency, IDispo
 
     public MainViewModel(IDialogService dialogService,
                          INavigationService navigationService,
-                         IAuthorService authorService)
+                         IAuthorService authorService,
+                         INostrService nostrService)
         : base(dialogService, navigationService)
     {
         _authorService = authorService;
+        _nostrService = nostrService;
     }
 
     public string UnreadLabel => $"{L["Unread"]} ({_postsWaiting.Count})";
 
     public override Task OnFirstAppear()
     {
+        if (GlobalSetting.Instance.DemoMode && _nostrService is TestNostrService)
+        {
+            _nostrService.StartNostr();
+        }
+
         WeakReferenceMessenger.Default.Send<ResetNavMessage>(new());
 
         WeakReferenceMessenger.Default.Register<NostrUserChangedMessage>(this, (r, m) =>

src/NuSocial/Views/LoginView.xaml

@@ -1,34 +1,42 @@
-<?xml version="1.0" encoding="utf-8" ?>
-<base:ContentPageFormBase
-    x:Class="NuSocial.Views.LoginView"
-    xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
-    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
-    xmlns:base="clr-namespace:NuSocial.Core.View"
-    xmlns:loc="clr-namespace:NuSocial.Helpers"
-    xmlns:toolkit="http://schemas.microsoft.com/dotnet/2022/maui/toolkit"
-    xmlns:viewModels="clr-namespace:NuSocial.ViewModels"
-    Title="{Binding Title}"
-    Padding="0,20"
-    x:DataType="viewModels:LoginViewModel"
-    x:TypeArguments="viewModels:LoginViewModel"
-    Shell.FlyoutBehavior="Disabled">
-    <Grid
-        Margin="20,0"
-        RowDefinitions="Auto,Auto,*"
-        RowSpacing="10">
-        <Label Text="Enter your account key to login:" VerticalOptions="Center" />
-        <Entry
-            Grid.Row="1"
-            IsPassword="True"
-            Placeholder="{loc:Translate AccountKeyPlaceholder}"
-            Text="{Binding AccountKey}" />
-        <Button
-            Grid.Row="2"
-            Margin="0,10"
-            Command="{Binding LoginCommand}"
-            MaximumWidthRequest="200"
-            Style="{StaticResource PrimaryActionButtonStyle}"
-            Text="{loc:Translate Login}"
-            VerticalOptions="Start" />
-    </Grid>
+<?xml version="1.0" encoding="utf-8" ?>
+<base:ContentPageFormBase
+    x:Class="NuSocial.Views.LoginView"
+    xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+    xmlns:base="clr-namespace:NuSocial.Core.View"
+    xmlns:loc="clr-namespace:NuSocial.Helpers"
+    xmlns:toolkit="http://schemas.microsoft.com/dotnet/2022/maui/toolkit"
+    xmlns:viewModels="clr-namespace:NuSocial.ViewModels"
+    Title="{Binding Title}"
+    Padding="0,20"
+    x:DataType="viewModels:LoginViewModel"
+    x:TypeArguments="viewModels:LoginViewModel"
+    Shell.FlyoutBehavior="Disabled">
+    <Grid
+        Margin="20,0"
+        RowDefinitions="Auto,Auto,*,*"
+        RowSpacing="10">
+        <Label Text="Enter your account key to login:" VerticalOptions="Center" />
+        <Entry
+            Grid.Row="1"
+            IsPassword="True"
+            Placeholder="{loc:Translate AccountKeyPlaceholder}"
+            Text="{Binding AccountKey}" />
+        <Button
+            Grid.Row="2"
+            Margin="0,10"
+            Command="{Binding LoginCommand}"
+            MaximumWidthRequest="200"
+            Style="{StaticResource PrimaryActionButtonStyle}"
+            Text="{loc:Translate Login}"
+            VerticalOptions="Start" />
+        <Button
+            Grid.Row="3"
+            Margin="0,10"
+            Command="{Binding DemoCommand}"
+            MaximumWidthRequest="200"
+            Style="{StaticResource PrimaryActionButtonStyle}"
+            Text="{loc:Translate Demo}"
+            VerticalOptions="Start" />
+    </Grid>
 </base:ContentPageFormBase>