codeplay/CodePlay.WebAPI/Hubs/ConversionHub.cs

using Microsoft.AspNetCore.SignalR;

namespace CodePlay.WebAPI.Hubs;

public class ConversionHub : Hub
{
    public async Task JoinProgressGroup(string conversionId)
    {
        await Groups.AddToGroupAsync(Context.ConnectionId, conversionId);
    }

    public async Task LeaveProgressGroup(string conversionId)
    {
        await Groups.RemoveFromGroupAsync(Context.ConnectionId, conversionId);
    }
}

public class ProgressMessage
{
    public int Percent { get; set; }
    public string CurrentFile { get; set; } = "";
    public string Status { get; set; } = "";
    public TimeSpan? EstimatedTimeRemaining { get; set; }
}