continuity/Server/PacketHandlers/CharacterNameCheckHandler.cs

using NetCoreServer;
using Server.DB;
using Wonderking.Packets.Incoming;
using Wonderking.Packets.Outgoing;

namespace Server.PacketHandlers;

public class CharacterNameCheckHandler : IPacketHandler<CharacterNameCheckPacket>
{
    private readonly WonderkingContext _wonderkingContext;

    public CharacterNameCheckHandler(WonderkingContext wonderkingContext)
    {
        _wonderkingContext = wonderkingContext;
    }

    public Task HandleAsync(CharacterNameCheckPacket packet, TcpSession session)
    {
        var isTaken = _wonderkingContext.Characters.Any(c => c.Name == packet.Name);
        var responsePacket = new CharacterNameCheckPacketResponse { IsTaken = isTaken };
        if (session is AuthSession authSession)
        {
            return authSession.SendAsync(responsePacket);
        }

        return Task.CompletedTask;
    }
}