bitforum-backend/Application/Features/Forum/Post/Create/Handler.cs

using Application.Abstractions.Messaging;
using Application.Abstractions.Data;
using SharedKernel.Storage;
using Microsoft.EntityFrameworkCore;

namespace Application.Features.Forum.Post.Create;

public sealed class Handler(IAppDbContext db, IFileStorage fileStorage) : ICommandHandler<Command>
{
    public async Task Handle(Command request, CancellationToken ct)
    {
        if (!await db.Board.AnyAsync(x => x.ID == request.BoardID, ct))
        {
            throw new KeyNotFoundException("게시판을 찾을 수 없습니다.");
        }

        var post = new Domain.Entities.Forum.Posts.Post
        {
            BoardID = request.BoardID,
            MemberID = null,
            Subject = request.Subject,
            Content = request.Content ?? string.Empty,
            IsNotice = request.IsNotice,
            IsSecret = request.IsSecret,
            IsAnonymous = request.IsAnonymous,
            Name = "관리자"
        };

        await db.Post.AddAsync(post, ct);
        await db.SaveChangesAsync(ct);

        if (request.ThumbnailFile is not null)
        {
            FileStoragePath uploadPath = new(UploadTarget.Upload, UploadFolder.Post, post.ID);
            string[] allowedFileExtensions = [".jpg", ".jpeg", ".png", ".gif", ".webp", ".bmp"];

            var result = await fileStorage.SaveFileAsync(request.ThumbnailFile, uploadPath, allowedFileExtensions, ct);
            post.Thumbnail = result?.Url;
            await db.SaveChangesAsync(ct);
        }

        // Board 게시글 카운트 증가
        var board = await db.Board.FirstOrDefaultAsync(x => x.ID == request.BoardID, ct);
        if (board is not null)
        {
            board.Posts++;
            board.UpdatedAt = DateTime.UtcNow;

            // BoardGroup 게시글 카운트 증가
            var boardGroup = await db.BoardGroup.FirstOrDefaultAsync(x => x.ID == board.BoardGroupID, ct);
            if (boardGroup is not null)
            {
                boardGroup.Posts++;
                boardGroup.UpdatedAt = DateTime.UtcNow;
            }

            await db.SaveChangesAsync(ct);
        }
    }
}