优化获取服务器返回的文件名

Author: lindexi

src/dotnetCampus.FileDownloader.Tool/Program.cs

@@ -1,5 +1,6 @@
 using System;
 using System.IO;
+using System.Net.Http;
 using System.Runtime.InteropServices.ComTypes;
 using System.Threading.Tasks;
 using CommandLine;
@@ -21,20 +22,29 @@ static async Task Main(string[] args)
 
                      // https://www.speedtest.cn/
                      var url =
-                          "https://speedtest1.gd.chinamobile.com.prod.hosts.ooklaserver.net:8080/download?size=25000000&r=0.2978374611691549";
+                         "https://node-103-27-27-20.speedtest.cn:51090/download?size=25000000&r=0.625866791098137";
                      url =
-                         "https://download.jetbrains.8686c.com/resharper/ReSharperUltimate.2020.1.3/JetBrains.ReSharperUltimate.2020.1.3.exe";
+                         "https://download.jetbrains.com/resharper/dotUltimate.2025.1/JetBrains.dotUltimate.2025.1.exe";
                      //var md5 = "7d6bbeb6617a7c0b7e615098fca1b167";// resharper
 
                      //url = "http://localhost:5000";
+
+                     // 这里的 gitdl.cn 是 iFileProxy 离线下载工具的地址，这是一个非常好的工具。开源地址： https://git.linxi.info/xianglin_admin/iFileProxy
+                     url = "https://gitdl.cn/https://github.com/srwi/EverythingToolbar/releases/download/1.5.2/EverythingToolbar-1.5.2.msi";
+
+                     //url =
+                     //    "https://down.pc.yyb.qq.com/pcyyb/packing/14e1e37f997f49a58d560ab97fa335aa/pcyyb_2702800040_installer.exe";
+                     //url = "https://pm.myapp.com/invc/xfspeed/qqpcmgr/download/QQPCDownload320001.exe";
+                     //// 这个地址带了 Content-Disposition 头，文件名是从这个头中获取的
                      url =
-                         "https://dscache.tencent-cloud.cn/upload//ES_686_194-4f155229efeef75bb9c9a3995060c766dc0eac28.png";
+                         "https://sw.pcmgr.qq.com/2f472366ca30d8ac1ad4acb64c77d2ad/680c8f51/spcmgr/download/BaiduNetdisk_txgj1_7.50.0.132.exe";
+                     //url = "https://pc-package.wpscdn.cn/wps/download/W.P.S.60.1955.exe";
 
-                     var file = new FileInfo(@"File.txt");
+                     var downloadFolder = new DirectoryInfo(@"DownloadFolder");
 
                      var progress = new Progress<DownloadProgress>();
 
-                     await FileDownloaderHelper.DownloadFileAsync(url, file, progress:progress);
+                     await FileDownloaderHelper.DownloadFileToFolderAsync(url, downloadFolder, progress:progress);
 #endif
                      await Task.Delay(100);
                  });

src/dotnetCampus.FileDownloader/DownloadByHttpClient/SegmentFileDownloaderByHttpClient.cs

@@ -136,6 +136,12 @@ private static SocketsHttpHandler CreateDefaultSocketsHttpHandler()
             //{
             //    return ValueTask.FromResult(context.PlaintextStream);
             //}
+
+            // 忽略证书错误
+            //SslOptions =
+            //{
+            //    RemoteCertificateValidationCallback = (sender, certificate, chain, errors) => true
+            //}
         };
 
         return socketsHttpHandler;

src/dotnetCampus.FileDownloader/FileDownloaderHelper.cs

@@ -7,6 +7,8 @@
 
 #if NETCOREAPP3_1_OR_GREATER
 using System.Net.Http;
+using System.Text.RegularExpressions;
+using System.Net.Http.Headers;
 #endif
 using System.Runtime.InteropServices;
 using System.Security.AccessControl;
@@ -168,14 +170,66 @@ protected override async Task<HttpResponseMessage> GetResponseAsync(HttpRequestM
                 var response = await base.GetResponseAsync(request);
                 if (string.IsNullOrEmpty(ServerSuggestionFileName))
                 {
+                    ServerSuggestionFileName = TryGetServerSuggestionFileName();
+                }
+
+                return response;
+
+                string? TryGetServerSuggestionFileName()
+                {
+                    var httpContentHeaders = response.Content.Headers;
+
+                    if (httpContentHeaders.ContentDisposition == null)
+                    {
+                        return null;
+                    }
+
+                    // {Last-Modified: Mon, 30 Dec 2024 09:27:04 GMT
+                    // Content-Type: application/octet-stream
+                    // Content-Disposition: attachment; filename*="UTF-8''BaiduNetdisk_txgj1_7.50.0.132.exe"
+                    // Content-Length: 403338840
+                    // }
+                    // 这里拿到的 nameValueHeaderValue 可能就取出
+                    NameValueHeaderValue? nameValueHeaderValue =
+                        httpContentHeaders.ContentDisposition.Parameters.FirstOrDefault(t => t.Name == "filename*");
+                    var fileNameValue = nameValueHeaderValue?.Value;
+                    if (!string.IsNullOrEmpty(fileNameValue))
+                    {
+                        // 额外判断一下 UTF-8 存在的情况
+                        var match = Regex.Match(fileNameValue, @"([\S\s]*)''([\S\s]*)");
+                        if (match.Success)
+                        {
+                            var encodingText = match.Groups[1].Value;
+                            var fileNameText = match.Groups[2].Value;
+                            if (string.Equals("utf-8", encodingText, StringComparison.OrdinalIgnoreCase))
+                            {
+                                // 以下转码用于防止中文名乱码
+                                var unescapeDataString = Uri.UnescapeDataString(fileNameText);
+                                return unescapeDataString;
+                            }
+                        }
+                        else
+                        {
+                            // 匹配不上，那就应该是整个都是文件名了
+                            return fileNameValue;
+                        }
+                    }
+
+                    var fileName = httpContentHeaders.ContentDisposition.FileName;
+                    if (!string.IsNullOrEmpty(fileName))
+                    {
+                        return fileName;
+                    }
+
                     if (response.Headers.TryGetValues("Content-Disposition", out var contentDispositionTextEnumerable) && contentDispositionTextEnumerable.FirstOrDefault() is { } contentDispositionText)
                     {
-                        ServerSuggestionFileName =
+                        // 正常不会放在这里的，都是在 Content 的 Header 里面的
+                        return
                             WebResponseHelper.GetFileNameFromContentDispositionText(contentDispositionText);
                     }
-                }
 
-                return response;
+                    return null;
+                }
             }
         }
 #else