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.Domain.ValueObjects;
+
+namespace Ping.Application.Friends
+{
+    public record RemoveFriendCommand(long CurrentUserId, Guid FriendshipId) : ICommand<ErrorOr<Success>>;
+
+    public class RemoveFriendCommandHandler(IDatabase database, IRealtimeNotifier notifier)
+        : ICommandHandler<RemoveFriendCommand, ErrorOr<Success>>
+    {
+        public async ValueTask<ErrorOr<Success>> Handle(RemoveFriendCommand request, CancellationToken cancellationToken)
+        {
+            var friendship = await database.Friendships.FirstOrDefaultAsync(f => f.Id == request.FriendshipId, cancellationToken);
+
+            if (friendship is null)
+                return Error.NotFound(description: $"Friendship {request.FriendshipId} not found");
+
+            if (friendship.RequesterId != request.CurrentUserId && friendship.AddresseeId != request.CurrentUserId)
+                return Error.Forbidden(description: "You are not part of this friendship");
+
+            if (friendship.Status != FriendshipStatus.Accepted)
+                return Error.Conflict(description: "This friendship is not active");
+
+            var otherUserId = friendship.RequesterId == request.CurrentUserId ? friendship.AddresseeId : friendship.RequesterId;
+
+            database.Friendships.Remove(friendship);
+            await database.SaveChangesAsync(cancellationToken);
+
+            await notifier.FriendshipUpdatedAsync(otherUserId, friendship.Id, cancellationToken);
+
+            return new Success();
+        }
+    }
+}