IM_NEW/MessageService.WebApi/Controllers/Message/MessageSendRequest.cs

using FluentValidation;
using MessageService.Domain.Enums;
using MessageService.WebApi.Application.Message;

namespace MessageService.WebApi.Controllers.Message
{
    public class MessageSendRequest
    {
        // 基础元数据
        public Guid ClientMsgId { get; init; }
        public Guid TargetId { get; init; }
        public ChatType ChatType { get; init; }
        public MessageType MsgType { get; init; }

        // 业务属性
        public Guid? QuoteMessageId { get; init; }
        public Dictionary<string, string>? Ext { get; init; }

        // 载荷数据（根据 MsgType 选择性填充）
        public string? Text { get; init; }
        public string? Url { get; init; }
        public int? Width { get; init; }
        public int? Height { get; init; }
        public string? Thumb { get; init; }
        public int? Duration { get; init; }

        public SendMsgCommand ToCommand(Guid senderId)
        {
            return new SendMsgCommand(
                senderId,
                TargetId,
                ChatType,
                MsgType,
                ClientMsgId,
                QuoteMessageId,
                Ext,
                Text,
                Url,
                Width,
                Height,
                Thumb,
                Duration
                );
        }
    }

    public class MessageSendRequestValidator : AbstractValidator<MessageSendRequest>
    {
        public MessageSendRequestValidator()
        {
            RuleFor(r => r.ClientMsgId)
                .NotNull()
                .NotEmpty();
            RuleFor(r => r.TargetId)
                .NotEmpty()
                .NotNull();

            // 文本消息：text 必填
            When(r => r.MsgType == MessageType.Text, () =>
            {
                RuleFor(r => r.Text).NotEmpty().WithMessage("文本消息的 text 字段不能为空");
            });

            // 图片/视频/语音消息：url 必填
            When(r => r.MsgType == MessageType.Image || r.MsgType == MessageType.Video
                   || r.MsgType == MessageType.Voice || r.MsgType == MessageType.File, () =>
            {
                RuleFor(r => r.Url).NotEmpty().WithMessage("媒体消息的 url 字段不能为空");
            });
        }
    }
}