iot/projects/Infrastructure/Web/Mvc/FileController.cs

using Infrastructure.Extensions;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Configuration;
using Newtonsoft.Json;
using System;
using System.Globalization;
using System.IO;
using System.IO.Compression;
using System.Net.Http;
using System.Security.Cryptography;

namespace Infrastructure.Web.Mvc
{
    public class FileController : Controller
    {
        private readonly IWebHostEnvironment _host;
        private readonly IConfiguration _cfg;
        private readonly IHttpClientFactory _httpClientFactory;

        public FileController(IWebHostEnvironment host, IConfiguration cfg, IHttpClientFactory httpClientFactory)
        {
            this._host = host;
            this._cfg = cfg;
            this._httpClientFactory = httpClientFactory;
        }

        public IActionResult Upload()
        {
            if (Request.Form.Files != null && Request.Form.Files.Count > 0)
            {
                var file = Request.Form.Files[0];
                var path = this.Save(file);
                return Content(new { error = 0, url = path }.ToJson());
            }

            return Content(new { error = 1, msg = "未选择文件" }.ToJson());
        }

        public IActionResult Json(string value)
        {
            return Content(value);
        }

        public string Save(IFormFile file)
        {
            if (file is null)
            {
                throw new ArgumentNullException(nameof(file));
            }
            var uploadUrl = this._cfg.GetSection("AppSettings").GetValue<string>("upload");

            using (Stream stream = file.OpenReadStream())
            {
                var ext = GetExtension(file.FileName);
                var md5 = GetFileNameHash(stream);

                if (string.IsNullOrEmpty(uploadUrl))
                {
                    var phicyPath = Path.Combine(this._host.WebRootPath, "upload");
                    Directory.CreateDirectory(phicyPath);
                    var name = string.Format(CultureInfo.CurrentCulture, "{0}.{1}", md5, ext);
                    var fullName = Path.Combine(phicyPath, name);
                    if (!System.IO.File.Exists(fullName))
                    {
                        using (FileStream fs = System.IO.File.Create(fullName))
                        {
                            file.CopyTo(fs);
                        }
                        if (ext == "zip")
                        {
                            var zipDirectory = Path.Combine(phicyPath, md5);
                            Directory.CreateDirectory(Path.Combine(phicyPath, md5));
                            ZipFile.ExtractToDirectory(fullName, zipDirectory);
                        }
                    }

                    return $"/upload/{name}";
                }
                else
                {
                    var hc = this._httpClientFactory.CreateClient();
                    var form = new MultipartFormDataContent();
                    stream.Seek(0, SeekOrigin.Begin);
                    var bytes = new byte[stream.Length];
                    stream.Read(bytes, 0, bytes.Length);
                    form.Add(new ByteArrayContent(bytes), "file", file.FileName);
                    form.Add(new StringContent("dfs"), "path");
                    form.Add(new StringContent("json"), "output");
                    var response = hc.PostAsync(uploadUrl, form).Result;
                    var result = response.Content.ReadAsStringAsync().Result;
                    var json = JsonConvert.DeserializeAnonymousType(result, new { url = "", md5 = "", path = "", domain = "", scene = "", size = 0, mtime = 0l, scenes = "", retmsg = "", retcode = -1, src = "" });
                    return $"/dfs{json.src}";
                }
            }
        }

        #region private

        private static string GetExtension(string value)
        {
            return value.Substring(value.LastIndexOf('.') + 1).ToLower(CultureInfo.CurrentCulture);
        }

        private static string GetFileNameHash(Stream input)
        {
            using (var hashAlg = SHA256.Create())
            {
                byte[] hash = hashAlg.ComputeHash(input);
                return BitConverter.ToString(hash).Replace("-", string.Empty, true, CultureInfo.CurrentCulture).ToLower(CultureInfo.CurrentCulture);
            }
        }

        #endregion private
    }
}