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

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

namespace Application.Features.Forum.Post.Update;

public sealed class Handler(IAppDbContext db, IFileStorage fileStorage) : ICommandHandler<Command>
{
    public async Task Handle(Command request, CancellationToken ct)
    {
        var post = await db.Post.FirstOrDefaultAsync(x => x.ID == request.ID, ct);
        if (post is null)
        {
            throw new KeyNotFoundException("게시글을 찾을 수 없습니다.");
        }

        post.Subject = request.Subject;
        post.Content = request.Content ?? string.Empty;
        post.IsNotice = request.IsNotice;
        post.IsSecret = request.IsSecret;
        post.IsAnonymous = request.IsAnonymous;
        post.UpdatedAt = DateTime.UtcNow;

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

            if (!string.IsNullOrEmpty(post.Thumbnail))
            {
                fileStorage.DeleteByUrl(post.Thumbnail);
            }

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

        await db.SaveChangesAsync(ct);
    }
}