filestorage/FileHandlers/FwLocalFileHandler.cs

using FileStorage;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Options;
using System.ComponentModel.DataAnnotations;
using static System.Runtime.InteropServices.JavaScript.JSType;

namespace FileHandlers
{
    [Display(Name = "local")]
    public class FwLocalFileHandler:FwFileHandlerBase
    {
        private readonly IOptionsSnapshot<FileUploadOptions> _fileUploadOptions;

        public FwLocalFileHandler(IOptionsSnapshot<FileUploadOptions> fileUploadOptions)
        {
            _fileUploadOptions = fileUploadOptions;
        }


        public override string Upload(string fileName, long length, string extraInfo,Stream fileData)
        {

            var settings = _fileUploadOptions.Value.Settings.Where(x=> x.Key.ToLower()=="local").Select(x=>x.Value).FirstOrDefault();
            string groupDir = "";
            if(settings!=null)
            {
                groupDir = settings.FirstOrDefault().GroupLocation;
            }
            if (string.IsNullOrEmpty(groupDir))
            {
                groupDir = "./uploads";
            }
            string pathHeader = groupDir;

            string fulldir = GetFullPath(pathHeader);
            if(!Directory.Exists(fulldir))
            {
                Directory.CreateDirectory(fulldir);
            }

            var ext = string.Empty;
            if(!string.IsNullOrEmpty(fileName))
            {
                var dotPos = fileName.LastIndexOf('.');
                ext = fileName.Substring(dotPos + 1);
            }
            var filename = $"{Guid.NewGuid().ToString().Replace("-",string.Empty)}.{ext}";
            var fullPath = Path.Combine(fulldir, filename);
            using (var fileStream = File.Create(fullPath))
            {
                fileData.CopyTo(fileStream);
            }
            fileData.Dispose();

            return (Path.Combine(pathHeader, filename));
        }


        private string GetFullPath(string path)
        {
            string rv = "";
            if (path.StartsWith("."))
            {
                rv = Path.Combine(Directory.GetCurrentDirectory(), path);
            }
            else
            {
                rv = path;
            }
            rv = Path.GetFullPath(rv);
            return rv;
        }
    }
}