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
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+using ErrorOr;
+using Mediator;
+using Microsoft.EntityFrameworkCore;
+using Ping.Application.Calls.Responses;
+using Ping.Application.Contracts;
+using Ping.Application.Shared;
+using Ping.Domain.ValueObjects;
+
+namespace Ping.Application.Calls
+{
+    public record RequestCallTokenCommand(long CurrentUserId, Guid ChannelId) : ICommand<ErrorOr<CallTokenResponse>>;
+
+    public class RequestCallTokenCommandHandler(IDatabase database, ICallTokenService callTokenService)
+        : ICommandHandler<RequestCallTokenCommand, ErrorOr<CallTokenResponse>>
+    {
+        public async ValueTask<ErrorOr<CallTokenResponse>> Handle(RequestCallTokenCommand request, CancellationToken cancellationToken)
+        {
+            var hasAccess = await database.HasAccessAsync(request.ChannelId, request.CurrentUserId, cancellationToken);
+            if (!hasAccess)
+                return Error.NotFound(description: $"Channel {request.ChannelId} not found");
+
+            var channel = await database.Channels.AsNoTracking().FirstAsync(c => c.Id == request.ChannelId, cancellationToken);
+            if (channel.Type != ChannelType.Voice && channel.Type != ChannelType.DirectMessage)
+                return Error.Validation(description: "Calls are only available in voice channels and direct messages");
+
+            var user = await database.Users.AsNoTracking().FirstAsync(u => u.Id == request.CurrentUserId, cancellationToken);
+
+            var accessToken = callTokenService.CreateAccessToken(
+                roomName: request.ChannelId.ToString(),
+                identity: request.CurrentUserId.ToString(),
+                displayName: user.DisplayName ?? user.Username);
+
+            return new CallTokenResponse(accessToken.Jwt, accessToken.RoomName);
+        }
+    }
+}