Add Ping backend

.NET 10 solution for Ping, a Discord style chat app: Domain, Application and Infrastructure projects plus the Api host. SignalR for chat and presence, LiveKit for call tokens, EF Core on Postgres, S3 compatible storage for attachments, and OIDC auth shared with the Musify Zitadel instance. Includes the Compose stack for local development.
2026-09-21 19:32:55 +02:00
commit 0623875dfa
126 changed files with 5048 additions and 0 deletions
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+using ErrorOr;
+using Mediator;
+using Microsoft.EntityFrameworkCore;
+using Ping.Application.Contracts;
+using Ping.Application.Messages.Responses;
+
+namespace Ping.Application.Messages
+{
+    public record EditMessageCommand(long CurrentUserId, Guid MessageId, string Content) : ICommand<ErrorOr<MessageResponse>>;
+
+    public class EditMessageCommandHandler(IDatabase database, IRealtimeNotifier notifier)
+        : ICommandHandler<EditMessageCommand, ErrorOr<MessageResponse>>
+    {
+        public async ValueTask<ErrorOr<MessageResponse>> Handle(EditMessageCommand request, CancellationToken cancellationToken)
+        {
+            if (string.IsNullOrWhiteSpace(request.Content))
+                return Error.Validation(description: "Message content cannot be empty");
+
+            var message = await database.Messages
+                .Include(m => m.Author)
+                .Include(m => m.Attachments)
+                .FirstOrDefaultAsync(m => m.Id == request.MessageId && m.DeletedAt == null, cancellationToken);
+
+            if (message is null)
+                return Error.NotFound(description: $"Message {request.MessageId} not found");
+
+            if (message.AuthorId != request.CurrentUserId)
+                return Error.Forbidden(description: "Only the author can edit this message");
+
+            message.Content = request.Content;
+            message.EditedAt = DateTime.UtcNow;
+            await database.SaveChangesAsync(cancellationToken);
+
+            var response = MessageResponse.FromEntity(message);
+            await notifier.MessageUpdatedAsync(message.ChannelId, response, cancellationToken);
+            return response;
+        }
+    }
+}