Start managed macOS AppKit client

clients/apple/dotnet/README.md

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+# Managed Apple clients
+
+`VoiceCat.Mac` is the native AppKit C# port. It targets `net10.0-macos` and references the same `VoiceCat.Core` and `VoiceCat.Audio` assemblies used by the Windows client and managed CLI.
+
+The current checkpoint is a functional guest-client shell: AppKit launch/menu lifecycle, host and nickname entry, explicit TOFU approval (including changed-key warning), channel selection, user roster, channel text, voice subscription, disconnect reporting, native accessibility labels, sandbox/network/audio entitlements, and deterministic disposal. It does not yet replace the Swift release. CoreAudio capture/playback, saved servers/accounts, moderation sheets, private messages, settings, ScreenCaptureKit sharing, VoiceOver verification, signing and notarization remain.
+
+Build on Apple Silicon macOS 15.6+ with Xcode 26 and the .NET 10 macOS workload:
+
+```bash
+dotnet workload install macos
+dotnet restore clients/apple/dotnet/VoiceCat.Apple.slnx
+dotnet build clients/apple/dotnet/VoiceCat.Apple.slnx -c Debug
+```
+
+The repository's `dotnet/build-native.ps1` must first stage an `osx-arm64` `libvoicecat_media.dylib`; that shim contains only Opus/RNNoise. Windows and Linux cannot compile or validate AppKit bindings, so the macOS build is a required CI/release gate.

clients/apple/dotnet/VoiceCat.Apple.slnx

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+<Solution>
+  <Folder Name="/apps/">
+    <Project Path="VoiceCat.Mac/VoiceCat.Mac.csproj" />
+  </Folder>
+  <Folder Name="/managed/">
+    <Project Path="../../../dotnet/src/VoiceCat.Protocol/VoiceCat.Protocol.csproj" />
+    <Project Path="../../../dotnet/src/VoiceCat.Crypto/VoiceCat.Crypto.csproj" />
+    <Project Path="../../../dotnet/src/VoiceCat.Codec/VoiceCat.Codec.csproj" />
+    <Project Path="../../../dotnet/src/VoiceCat.Dsp/VoiceCat.Dsp.csproj" />
+    <Project Path="../../../dotnet/src/VoiceCat.Audio/VoiceCat.Audio.csproj" />
+    <Project Path="../../../dotnet/src/VoiceCat.Core/VoiceCat.Core.csproj" />
+  </Folder>
+</Solution>

clients/apple/dotnet/VoiceCat.Mac/AppDelegate.cs

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+using AppKit;
+using Foundation;
+
+namespace VoiceCat.Mac;
+
+internal sealed class AppDelegate : NSApplicationDelegate
+{
+    private ConnectWindowController? connect;
+    public override void DidFinishLaunching(NSNotification notification)
+    {
+        NSApplication.SharedApplication.ActivationPolicy = NSApplicationActivationPolicy.Regular;
+        BuildMenu();
+        connect = new(); connect.ShowWindow(this);
+        NSApplication.SharedApplication.ActivateIgnoringOtherApps(true);
+    }
+    public override bool ApplicationShouldTerminateAfterLastWindowClosed(NSApplication sender) => true;
+    private static void BuildMenu()
+    {
+        var menu = new NSMenu(); var root = new NSMenuItem(); menu.AddItem(root);
+        var application = new NSMenu(); application.AddItem(new NSMenuItem("Quit VoiceCat", "q", (_, _) => NSApplication.SharedApplication.Terminate(null)));
+        root.Submenu = application; NSApplication.SharedApplication.MainMenu = menu;
+    }
+}

clients/apple/dotnet/VoiceCat.Mac/ConnectWindowController.cs

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+using AppKit;
+using CoreGraphics;
+using Foundation;
+using VoiceCat.Core;
+using VoiceCat.Crypto;
+
+namespace VoiceCat.Mac;
+
+internal sealed class ConnectWindowController : NSWindowController
+{
+    private readonly NSTextField host = new(new CGRect(120, 180, 280, 26)) { StringValue = "127.0.0.1:8384", PlaceholderString = "Host:port" };
+    private readonly NSTextField nickname = new(new CGRect(120, 140, 280, 26)) { StringValue = NSProcessInfo.ProcessInfo.UserName, PlaceholderString = "Nickname" };
+    private readonly NSTextField status = NSTextField.CreateLabel("Ready to connect");
+    private readonly NSButton connect = new(new CGRect(300, 55, 100, 32)) { Title = "Connect", BezelStyle = NSBezelStyle.Rounded };
+    private VoiceCatClient? client;
+    private MainWindowController? main;
+
+    internal ConnectWindowController() : base(new NSWindow(new CGRect(0, 0, 520, 260), NSWindowStyle.Titled | NSWindowStyle.Closable,
+        NSBackingStore.Buffered, false))
+    {
+        Window!.Title = "Connect to VoiceCat"; Window.Center();
+        var view = Window.ContentView!;
+        var hostLabel = NSTextField.CreateLabel("Server"); hostLabel.Frame = new CGRect(30, 185, 80, 20); view.AddSubview(hostLabel); view.AddSubview(host);
+        var nicknameLabel = NSTextField.CreateLabel("Nickname"); nicknameLabel.Frame = new CGRect(30, 145, 80, 20); view.AddSubview(nicknameLabel); view.AddSubview(nickname);
+        status.Frame = new CGRect(30, 95, 370, 22); status.AccessibilityLabel = "Connection status"; view.AddSubview(status);
+        connect.AccessibilityLabel = "Connect to server"; connect.Activated += Connect; view.AddSubview(connect);
+        Window.DefaultButtonCell = connect.Cell;
+    }
+
+    private async void Connect(object? sender, EventArgs args)
+    {
+        if (client is not null) return;
+        try
+        {
+            connect.Enabled = false; status.StringValue = "Connecting…";
+            (string serverHost, ushort port) = ParseEndpoint(host.StringValue);
+            string pins = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData), "VoiceCat", "tofu.txt");
+            client = new("VoiceCat macOS", "0.1.0", pins);
+            await client.ConnectAsync(serverHost, port, ConfirmIdentity);
+            var auth = await client.AuthenticateGuestAsync(nickname.StringValue);
+            if (!auth.Ok) throw new InvalidOperationException(auth.Error);
+            main = new(client, auth.Self.Id, nickname.StringValue);
+            client = null; main.ShowWindow(this); Window.Close();
+        }
+        catch (Exception exception)
+        {
+            if (client is not null) await client.DisposeAsync(); client = null;
+            status.StringValue = exception.Message; connect.Enabled = true;
+        }
+    }
+
+    private ValueTask<bool> ConfirmIdentity(ServerIdentityChallenge challenge, CancellationToken cancellationToken)
+    {
+        var completion = new TaskCompletionSource<bool>(TaskCreationOptions.RunContinuationsAsynchronously);
+        NSApplication.SharedApplication.InvokeOnMainThread(() =>
+        {
+            var alert = new NSAlert { MessageText = challenge.Status == TofuStatus.FirstConnect ? "Trust this VoiceCat server?" : "Server identity changed",
+                InformativeText = $"{challenge.Host}:{challenge.Port}\n\nCertificate SHA-256:\n{challenge.CertificateFingerprint}", AlertStyle = challenge.Status == TofuStatus.Mismatch ? NSAlertStyle.Critical : NSAlertStyle.Informational };
+            alert.AddButton("Trust and connect"); alert.AddButton("Cancel"); completion.TrySetResult(alert.RunModal() == 1000);
+        });
+        return new(completion.Task.WaitAsync(cancellationToken));
+    }
+
+    private static (string Host, ushort Port) ParseEndpoint(string value)
+    {
+        int separator = value.LastIndexOf(':');
+        if (separator <= 0 || !ushort.TryParse(value[(separator + 1)..], out ushort port) || port == 0) throw new ArgumentException("Enter a server as host:port.");
+        return (value[..separator].Trim('[', ']'), port);
+    }
+}

clients/apple/dotnet/VoiceCat.Mac/Info.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0"><dict>
+  <key>CFBundleDisplayName</key><string>VoiceCat</string>
+  <key>CFBundleIdentifier</key><string>net.iamtalon.voicecat</string>
+  <key>CFBundleName</key><string>VoiceCat</string>
+  <key>CFBundleVersion</key><string>1</string>
+  <key>CFBundleShortVersionString</key><string>0.1.0</string>
+  <key>LSMinimumSystemVersion</key><string>14.0</string>
+  <key>NSMicrophoneUsageDescription</key><string>VoiceCat uses the microphone when you join voice and enable a microphone stream.</string>
+  <key>NSScreenCaptureUsageDescription</key><string>VoiceCat uses ScreenCaptureKit only when you share desktop or application audio.</string>
+  <key>NSPrincipalClass</key><string>NSApplication</string>
+</dict></plist>

clients/apple/dotnet/VoiceCat.Mac/MainWindowController.cs

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+using AppKit;
+using CoreGraphics;
+using Foundation;
+using VoiceCat.Core;
+using Voicecat.V1;
+
+namespace VoiceCat.Mac;
+
+internal sealed class MainWindowController : NSWindowController
+{
+    private readonly VoiceCatClient client;
+    private readonly uint selfId;
+    private readonly NSPopUpButton channels = new(new CGRect(20, 515, 300, 28), false);
+    private readonly NSTextView users = new(new CGRect(0, 0, 190, 430)) { Editable = false, Selectable = true };
+    private readonly NSTextView chat = new(new CGRect(0, 0, 510, 390)) { Editable = false, Selectable = true };
+    private readonly NSTextField compose = new(new CGRect(230, 55, 400, 28)) { PlaceholderString = "Message to current channel" };
+    private readonly NSButton send = new(new CGRect(640, 53, 90, 32)) { Title = "Send" };
+    private readonly NSButton voice = new(new CGRect(630, 510, 100, 32)) { Title = "Join voice" };
+    private readonly NSTextField status = NSTextField.CreateLabel("Connected");
+    private readonly NSTimer timer;
+    private uint currentChannel = 1;
+    private bool joinedVoice;
+
+    internal MainWindowController(VoiceCatClient client, uint selfId, string nickname) : base(new NSWindow(new CGRect(0, 0, 760, 570),
+        NSWindowStyle.Titled | NSWindowStyle.Closable | NSWindowStyle.Resizable | NSWindowStyle.Miniaturizable, NSBackingStore.Buffered, false))
+    {
+        this.client = client; this.selfId = selfId;
+        Window!.Title = $"VoiceCat — {nickname}"; Window.Center(); Window.MinSize = new CGSize(680, 480);
+        var content = Window.ContentView!;
+        channels.AccessibilityLabel = "Channel"; channels.Activated += ChangeChannel; content.AddSubview(channels);
+        voice.AccessibilityLabel = "Join or leave voice"; voice.Activated += ToggleVoice; content.AddSubview(voice);
+        var userScroll = new NSScrollView(new CGRect(20, 90, 190, 410)) { HasVerticalScroller = true, DocumentView = users }; userScroll.AccessibilityLabel = "Users in channel"; content.AddSubview(userScroll);
+        var chatScroll = new NSScrollView(new CGRect(230, 90, 500, 410)) { HasVerticalScroller = true, DocumentView = chat }; chatScroll.AccessibilityLabel = "Channel messages"; content.AddSubview(chatScroll);
+        compose.AccessibilityLabel = "Message"; compose.Activated += Send; content.AddSubview(compose);
+        send.AccessibilityLabel = "Send message"; send.Activated += Send; content.AddSubview(send);
+        status.Frame = new CGRect(20, 22, 700, 22); status.AccessibilityLabel = "Connection status"; content.AddSubview(status);
+        timer = NSTimer.CreateRepeatingScheduledTimer(TimeSpan.FromMilliseconds(50), _ => Pump());
+        RefreshState();
+    }
+
+    private void Pump()
+    {
+        while (client.TryReadEvent(out Envelope? envelope))
+        {
+            if (envelope!.TextMessage is { } text) Append($"[{DateTime.Now:t}] {Name(text.SenderId)}: {text.Body}");
+            if (envelope.ServerState is not null || envelope.ChannelEvent is not null || envelope.UserEvent is not null) RefreshState();
+            if (envelope.Disconnect is { } disconnected) { status.StringValue = "Disconnected: " + disconnected.Reason; voice.Enabled = send.Enabled = false; }
+        }
+        if (client.Audio.Failure is { } failure) status.StringValue = "Audio stopped: " + failure.Message;
+    }
+    private void RefreshState()
+    {
+        string? selected = channels.SelectedItem?.RepresentedObject?.ToString();
+        channels.RemoveAllItems();
+        foreach (var channel in client.Channels.OrderBy(c => c.Order).ThenBy(c => c.Name)) { channels.AddItem(channel.Name); channels.LastItem!.RepresentedObject = new NSString(channel.Id.ToString()); }
+        currentChannel = client.Users.FirstOrDefault(u => u.Id == selfId)?.ChannelId ?? currentChannel;
+        int selectedIndex = client.Channels.ToList().FindIndex(c => c.Id == currentChannel); if (selectedIndex >= 0) channels.SelectItem(selectedIndex);
+        users.Value = string.Join("\n", client.Users.Where(u => u.ChannelId == currentChannel).OrderBy(u => u.Nickname).Select(u => (u.Id == selfId ? "You — " : "") + u.Nickname));
+        status.StringValue = $"Connected · {client.Users.Count} users";
+    }
+    private async void ChangeChannel(object? sender, EventArgs args)
+    {
+        if (!uint.TryParse(channels.SelectedItem?.RepresentedObject?.ToString(), out uint id) || id == currentChannel) return;
+        try { var result = (await client.RequestAsync(new() { JoinChannel = new() { ChannelId = id } })).JoinChannelResult; if (!result.Ok) status.StringValue = result.Error; }
+        catch (Exception exception) { status.StringValue = exception.Message; }
+    }
+    private void Send(object? sender, EventArgs args)
+    {
+        string body = compose.StringValue.Trim(); if (body.Length == 0) return;
+        try { client.Send(new() { TextMessage = new() { Scope = TextScope.TextChannel, TargetId = currentChannel, Body = body, ClientMsgId = Guid.NewGuid().ToString("N") } }); compose.StringValue = ""; }
+        catch (Exception exception) { status.StringValue = exception.Message; }
+    }
+    private async void ToggleVoice(object? sender, EventArgs args)
+    {
+        try
+        {
+            if (!joinedVoice) { var result = await client.SubscribeVoiceAsync(); if (!result.Ok) throw new InvalidOperationException(result.Error); joinedVoice = true; voice.Title = "Leave voice"; }
+            else { await client.RequestAsync(new() { UnsubscribeVoice = new() }); joinedVoice = false; voice.Title = "Join voice"; }
+        }
+        catch (Exception exception) { status.StringValue = exception.Message; }
+    }
+    private string Name(uint id) => client.Users.FirstOrDefault(u => u.Id == id)?.Nickname ?? $"User {id}";
+    private void Append(string line) { chat.Value = chat.Value.Length == 0 ? line : chat.Value + "\n" + line; chat.ScrollToEndOfDocument(this); }
+    protected override void Dispose(bool disposing)
+    {
+        if (disposing) { timer.Invalidate(); client.DisposeAsync().AsTask().GetAwaiter().GetResult(); }
+        base.Dispose(disposing);
+    }
+}

clients/apple/dotnet/VoiceCat.Mac/Program.cs

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+using AppKit;
+
+NSApplication.Init();
+NSApplication.SharedApplication.Delegate = new VoiceCat.Mac.AppDelegate();
+NSApplication.SharedApplication.Run();

clients/apple/dotnet/VoiceCat.Mac/VoiceCat.Mac.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net10.0-macos</TargetFramework>
+    <RuntimeIdentifier>osx-arm64</RuntimeIdentifier>
+    <SupportedOSPlatformVersion>14.0</SupportedOSPlatformVersion>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <ApplicationTitle>VoiceCat</ApplicationTitle>
+    <ApplicationId>net.iamtalon.voicecat</ApplicationId>
+    <UseHardenedRuntime>true</UseHardenedRuntime>
+    <ApplicationManifest>Info.plist</ApplicationManifest>
+    <CodesignEntitlements>VoiceCat.Mac.entitlements</CodesignEntitlements>
+  </PropertyGroup>
+  <ItemGroup>
+    <ProjectReference Include="../../../../dotnet/src/VoiceCat.Core/VoiceCat.Core.csproj" />
+  </ItemGroup>
+</Project>

clients/apple/dotnet/VoiceCat.Mac/VoiceCat.Mac.entitlements

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0"><dict>
+  <key>com.apple.security.app-sandbox</key><true/>
+  <key>com.apple.security.network.client</key><true/>
+  <key>com.apple.security.device.audio-input</key><true/>
+  <key>com.apple.security.files.user-selected.read-write</key><true/>
+</dict></plist>