Media moderator PoC works, abstract command handling to library

1 files changed, 79 insertions, 0 deletions

diff --git a/Utilities/LibMatrix.Utilities.Bot/Services/CommandListenerHostedService.cs b/Utilities/LibMatrix.Utilities.Bot/Services/CommandListenerHostedService.cs
new file mode 100644
index 0000000..d5e7dd6
--- /dev/null
+++ b/Utilities/LibMatrix.Utilities.Bot/Services/CommandListenerHostedService.cs
@@ -0,0 +1,79 @@
+using LibMatrix.Homeservers;
+using LibMatrix.StateEventTypes.Spec;
+using MediaModeratorPoC.Bot.Interfaces;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+using Microsoft.Extensions.Logging;
+
+namespace LibMatrix.Utilities.Bot.Services;
+
+public class CommandListenerHostedService : IHostedService {
+    private readonly AuthenticatedHomeserverGeneric _hs;
+    private readonly ILogger<CommandListenerHostedService> _logger;
+    private readonly IEnumerable<ICommand> _commands;
+    private readonly LibMatrixBotConfiguration _config;
+
+    private Task? _listenerTask;
+
+    public CommandListenerHostedService(AuthenticatedHomeserverGeneric hs, ILogger<CommandListenerHostedService> logger, IServiceProvider services,
+        LibMatrixBotConfiguration config) {
+        logger.LogInformation("{} instantiated!", this.GetType().Name);
+        _hs = hs;
+        _logger = logger;
+        _config = config;
+        _logger.LogInformation("Getting commands...");
+        _commands = services.GetServices<ICommand>();
+        _logger.LogInformation("Got {} commands!", _commands.Count());
+    }
+
+    /// <summary>Triggered when the application host is ready to start the service.</summary>
+    /// <param name="cancellationToken">Indicates that the start process has been aborted.</param>
+    public Task StartAsync(CancellationToken cancellationToken) {
+        _listenerTask = Run(cancellationToken);
+        _logger.LogInformation("Command listener started (StartAsync)!");
+        return Task.CompletedTask;
+    }
+
+    private async Task? Run(CancellationToken cancellationToken) {
+        _logger.LogInformation("Starting command listener!");
+        _hs.SyncHelper.TimelineEventHandlers.Add(async @event => {
+            var room = await _hs.GetRoom(@event.RoomId);
+            // _logger.LogInformation(eventResponse.ToJson(indent: false));
+            if (@event is { Type: "m.room.message", TypedContent: RoomMessageEventData message }) {
+                if (message is { MessageType: "m.text" }) {
+                    var messageContentWithoutReply = message.Body.Split('\n', StringSplitOptions.RemoveEmptyEntries).SkipWhile(x=>x.StartsWith(">")).Aggregate((x, y) => $"{x}\n{y}");
+                    if (messageContentWithoutReply.StartsWith(_config.Prefix)) {
+                        var command = _commands.FirstOrDefault(x => x.Name == messageContentWithoutReply.Split(' ')[0][_config.Prefix.Length..]);
+                        if (command == null) {
+                            await room.SendMessageEventAsync("m.room.message",
+                                new RoomMessageEventData(messageType: "m.notice", body: "Command not found!"));
+                            return;
+                        }
+
+                        var ctx = new CommandContext {
+                            Room = room,
+                            MessageEvent = @event,
+                            Homeserver = _hs
+                        };
+                        if (await command.CanInvoke(ctx)) {
+                            await command.Invoke(ctx);
+                        }
+                        else {
+                            await room.SendMessageEventAsync("m.room.message",
+                                new RoomMessageEventData(messageType: "m.notice", body: "You do not have permission to run this command!"));
+                        }
+                    }
+                }
+            }
+        });
+        await _hs.SyncHelper.RunSyncLoop(cancellationToken: cancellationToken);
+    }
+
+    /// <summary>Triggered when the application host is performing a graceful shutdown.</summary>
+    /// <param name="cancellationToken">Indicates that the shutdown process should no longer be graceful.</param>
+    public Task StopAsync(CancellationToken cancellationToken) {
+        _logger.LogInformation("Shutting down command listener!");
+        _listenerTask.Wait(cancellationToken);
+        return Task.CompletedTask;
+    }
+}