2chBackAPI/APIControllers/PictureUpload.cs

using Microsoft.AspNetCore.Mvc;
using NeDvachAPI.DBControllers;
using SkiaSharp;

namespace NeDvachAPI.Controllers
{
    [ApiController]
    [Route("[controller]")]
    public class UploadPic : ControllerBase
    {                


        [HttpPost(Name = "UploadPicture")]
        public async Task<JsonResult> ReceivePost([FromForm] IFormFile PostPicture)
        {
            var supportedTypes = new[] { ".jpg", ".png", ".jpeg" };
            string receivedFileName = PostPicture.FileName;
            string fName = Path.GetFileNameWithoutExtension(receivedFileName);
            string fExtention = Path.GetExtension(receivedFileName);
            string previevFileName = fName + 's' + fExtention;

            Console.WriteLine("Расширение файла: " + fExtention);

            if (supportedTypes.Contains(fExtention.ToLower()))  //file type check
            {
                ///Local Buffer File Part
                string filePath;
                string previevPath;
                filePath = Directory.GetCurrentDirectory() + "\\Buffer\\" + receivedFileName;
                previevPath = Directory.GetCurrentDirectory() + "\\Buffer\\" + previevFileName;
                Stream picBuffer = new FileStream(filePath, FileMode.Create, FileAccess.ReadWrite, FileShare.ReadWrite);
                PostPicture.CopyTo(picBuffer);
                picBuffer.Close();
                ///resize part

                bool resizeImage(string picPath, string smallPath, int width, int height)
                {
                    var dstInfo = new SKImageInfo(height, width);
                    var bitmap = SKBitmap.Decode(picPath);

                    var image = SKImage.FromBitmap(bitmap.Resize(dstInfo, SKFilterQuality.Medium));
                    var data = image.Encode(SKEncodedImageFormat.Jpeg, 90);

                    using (var stream = new FileStream(smallPath, FileMode.Create, FileAccess.Write))
                        data.SaveTo(stream);

                    data.Dispose();
                    image.Dispose();
                    bitmap.Dispose();
                    return true;
                }
                resizeImage(filePath, previevPath, 300, 400);
                ///MinIo part
                await MinIOchat.PictureUpload(previevPath, receivedFileName, "thread-pics-small");
                JsonResult picAdress = new(await MinIOchat.PictureUpload(filePath, receivedFileName, "thread-pics"));
                Console.WriteLine("Загружен файл:" + "http://static.vdk2ch.ru:15555/thread-pics/" + receivedFileName);
                return picAdress;
            }

            else return new JsonResult("Неверный тип файла");
        }

        
    }
    
}