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c# - 如何在后台下载 FTPES 密码保护文件

问题描述

在过去的几周里，我一直在搞砸很多事情，似乎找不到正确的方法。我在 Unity 中这样做，但当然本质应该可以在环境。

我在 FTPES 上有 3 个音频文件和一个文本文档，要通过 FTP 清除显式 TLS：

我已使用以下代码成功登录以验证文件是否存在：

WebRequest.RegisterPrefix("ftps", new FtpsWebRequestCreator());
ftpRequest = (FtpWebRequest)WebRequest.Create("ftps://" + IP + "/" + fileEndPath);
ftpRequest.Credentials = new NetworkCredential(User, Password);
ftpRequest.Method = WebRequestMethods.Ftp.GetFileSize;

ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(ValidateCertificate);
ServicePointManager.Expect100Continue = true;

ftpResponse = (FtpWebResponse)ftpRequest.GetResponse();
ftpResponse.Close();
ValidConnection = true;[/code]

话虽如此，我也通过多种方式成功下载了该文件。我遇到的问题如下：

我在这篇文章中使用的是 WebClient.DownloadFileAsyn：

internal void Download(FileType fileType)
{
    IsDownloading = true;
    if (ValidConnection)
    {
        try
        {
            StartCoroutine(SetFileCreation());

            using (WebClient client = new WebClient())
            {
                WebRequest.RegisterPrefix("ftps", new FtpsWebRequestCreator());
                client.Credentials = new NetworkCredential(ftpUserID, ftpPassword);
                client.DownloadProgressChanged += new DownloadProgressChangedEventHandler(DownloadFileProgressChanged);
                client.DownloadFileCompleted += new AsyncCompletedEventHandler(DownloadFileCompleted);
                client.DownloadFileAsync(ftpIP, Application.dataPath + "/StreamingAssets/" + ftpFilePath, fileType);
            }
        }
        catch (WebException ex)
        {
            Debug.LogError(ex.Message + ex.StackTrace + "\n");
        }
    }
    else
        IsDownloading = false;
}

设置文件创建（）；是一种验证位置的方法，如果存在，则覆盖，否则在继续之前创建目录。

现在我没有任何干净的代码（除了我所展示的）来展示我一直在做的事情，但是如果有人可以指出我的一个很好的例子，（我还没有找到很多关于从 Unity 中的 FTPS 下载的内容）或只是分享他们如何从头开始解决这个问题，我们将不胜感激。

附带说明一下，我知道我的 FTP 服务器通过https://ftptest.net/按预期运行 我的服务器日志（我自己托管它，所以我可以完全控制设置）显示所有正确的消息，直到RETR 和传输成功消息。

我看过很多关于 FTPS 的帖子，关于 Unity 内部和外部的各种下载方式，所有不同级别的网络通信；高级和低级，以及如何将文件夹中的文件实时加载到 Unity 中。但是没有什么可以将这一切合二为一，又好又干净。吻！

和我们大多数人一样，我要关注更大的图景，不能让这个细节继续延迟开发。

编辑（服务器日志）：

这是来自我的 WebClient.DownloadAsync() 的服务器日志；

(000657)08/23/2018 22:51:32 - (not logged in) ([MyIP])> Connected, sending welcome message...
(000657)08/23/2018 22:51:32 - (not logged in) ([MyIP])> AUTH TLS
(000657)08/23/2018 22:51:32 - (not logged in) ([MyIP])> 234 Using authentication type TLS
(000657)08/23/2018 22:51:32 - (not logged in) ([MyIP])> SSL connection established
(000657)08/23/2018 22:51:32 - (not logged in) ([MyIP])> PBSZ 0
(000657)08/23/2018 22:51:32 - (not logged in) ([MyIP])> 200 PBSZ=0
(000657)08/23/2018 22:51:32 - (not logged in) ([MyIP])> PROT P
(000657)08/23/2018 22:51:32 - (not logged in) ([MyIP])> 200 Protection level set to P
(000657)08/23/2018 22:51:32 - (not logged in) ([MyIP])> USER Test
(000657)08/23/2018 22:51:32 - (not logged in) ([MyIP])> 331 Password required for test
(000657)08/23/2018 22:51:32 - (not logged in) ([MyIP])> PASS ********
(000657)08/23/2018 22:51:32 - test ([MyIP])> 230 Logged on
(000657)08/23/2018 22:51:32 - test ([MyIP])> OPTS utf8 on
(000657)08/23/2018 22:51:32 - test ([MyIP])> 200 UTF8 mode enabled
(000657)08/23/2018 22:51:32 - test ([MyIP])> PWD
(000657)08/23/2018 22:51:32 - test ([MyIP])> 257 "/" is current directory.
(000657)08/23/2018 22:51:32 - test ([MyIP])> CWD /
(000657)08/23/2018 22:51:32 - test ([MyIP])> 250 CWD successful. "/" is current directory.
(000657)08/23/2018 22:51:32 - test ([MyIP])> TYPE I
(000657)08/23/2018 22:51:32 - test ([MyIP])> 200 Type set to I
(000657)08/23/2018 22:51:32 - test ([MyIP])> PASV
(000657)08/23/2018 22:51:32 - test ([MyIP])> 227 Entering Passive Mode ([MyIP],195,146)
(000657)08/23/2018 22:51:32 - test ([MyIP])> RETR MainQuests.txt
(000657)08/23/2018 22:51:32 - test ([MyIP])> 150 Connection accepted
(000657)08/23/2018 22:51:32 - test ([MyIP])> SSL connection for data connection established
(000657)08/23/2018 22:51:32 - test ([MyIP])> 226 Transfer OK

值得注意的是，连接是保持的..它不会关闭，因为连接设置为文件下载完成后关闭......

这是我在使用 C# 任务时得到的日志，如Dan Flanagan的示例中所示：

(000659)08/23/2018 22:58:10 - (not logged in) ([MyIP])> Connected, sending welcome message...
(000659)08/23/2018 22:58:10 - (not logged in) ([MyIP])> AUTH TLS
(000659)08/23/2018 22:58:10 - (not logged in) ([MyIP])> 234 Using authentication type TLS
(000659)08/23/2018 22:58:10 - (not logged in) ([MyIP])> SSL connection established
(000659)08/23/2018 22:58:10 - (not logged in) ([MyIP])> PBSZ 0
(000659)08/23/2018 22:58:10 - (not logged in) ([MyIP])> 200 PBSZ=0
(000659)08/23/2018 22:58:10 - (not logged in) ([MyIP])> PROT P
(000659)08/23/2018 22:58:10 - (not logged in) ([MyIP])> 200 Protection level set to P
(000659)08/23/2018 22:58:10 - (not logged in) ([MyIP])> USER Test
(000659)08/23/2018 22:58:10 - (not logged in) ([MyIP])> 331 Password required for test
(000659)08/23/2018 22:58:10 - (not logged in) ([MyIP])> PASS ********
(000659)08/23/2018 22:58:10 - test ([MyIP])> 230 Logged on
(000659)08/23/2018 22:58:10 - test ([MyIP])> OPTS utf8 on
(000659)08/23/2018 22:58:10 - test ([MyIP])> 200 UTF8 mode enabled
(000659)08/23/2018 22:58:10 - test ([MyIP])> PWD
(000659)08/23/2018 22:58:10 - test ([MyIP])> 257 "/" is current directory.
(000659)08/23/2018 22:58:10 - test ([MyIP])> CWD /
(000659)08/23/2018 22:58:10 - test ([MyIP])> 250 CWD successful. "/" is current directory.
(000659)08/23/2018 22:58:10 - test ([MyIP])> TYPE I
(000659)08/23/2018 22:58:10 - test ([MyIP])> 200 Type set to I
(000659)08/23/2018 22:58:10 - test ([MyIP])> PASV
(000659)08/23/2018 22:58:10 - test ([MyIP])> 227 Entering Passive Mode ([MyIP],195,147)
(000659)08/23/2018 22:58:10 - test ([MyIP])> RETR MainQuests.txt
(000659)08/23/2018 22:58:10 - test ([MyIP])> 150 Connection accepted
(000659)08/23/2018 22:58:10 - test ([MyIP])> SSL connection for data connection established
(000659)08/23/2018 22:58:10 - test ([MyIP])> 426 Connection closed;    transfer aborted. (000659)08/23/2018 22:58:10 - test ([MyIP])> QUIT
(000659)08/23/2018 22:58:10 - test ([MyIP])> 221 Goodbye
(000659)08/23/2018 22:58:10 - test ([MyIP])> disconnected.

标签： c#unity3d

解决方案

我删除了我在 Unity 中为你工作的旧 FTP 下载器脚本。您可能希望将文件保存在 Streaming Assets 文件夹中。不过，这应该对您有所帮助。我用它来下载他们从 StreamingAssets 文件夹播放的视频，但下载器确实有效。

using System;
using System.Threading.Tasks;
using System.IO;
using System.Net;

public class FTPDownloader : MonoBehaviour
{

    public bool editorDownload;
    public string savePath;
    public string saveDir;
    public string username;
    public string pswd;

    public void StartDownload(string serverIP, string serverFolder, string fileName)
    {
        string url = string.Format("{0}{1}{2}{3}", "ftp://", serverIP, serverFolder, fileName);
        Task task = new Task(() =>
        {
            Download(url, fileName);
        });
        task.Start();
    }

    void Download(string url, string fileName)
    {
        if (!editorDownload)
        {
            return;
        }
        string path = Path.Combine(saveDir, fileName);

        try
        {
            if(File.Exists(path))
            {
                //already downloaded
                return;
            }
            //Debug.Log(url);
            FtpWebRequest request = (FtpWebRequest)WebRequest.Create(url);
            request.Credentials = new NetworkCredential(username, pswd);

            using (Stream ftpStream = request.GetResponse().GetResponseStream())
            using (Stream fileStream = File.Create(path))
            {
                byte[] buffer = new byte[10240];
                int read;
                int total = 0;
                while ((read = ftpStream.Read(buffer, 0, buffer.Length)) > 0)
                {
                    fileStream.Write(buffer, 0, read);
                    total += read;
                }
            }
        }
        catch (Exception e)
        {
            if (File.Exists(path))
            {
                File.Delete(path);
            }
            //Debug.Log(e.ToString());
        }
    }
}

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