csharp: Download SVN source

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using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; using System.Net; using System.Text.RegularExpressions; using System.IO; using System.Threading; using System.Xml;   namespace DownloadSVN {         /// <summary>     /// SVN 2016-05-13     /// Geovin Du edit     /// </summary>     public partial class MainForm : Form     {         ManualResetEvent _waitingForStop;         ManualResetEvent _finishedReadingTree;         List<FileDownloadData> _filesToDownload;         Thread _readingThread;         String _selectedSourceType;           public MainForm()         {             InitializeComponent();               this.comboBoxSourceType.SelectedIndex = 0;         }           private void buttonBrowseTargetFolder_Click(object sender, EventArgs e)         {             using (FolderBrowserDialog fbd = new FolderBrowserDialog())             {                 if (fbd.ShowDialog() == DialogResult.OK)                     this.textBoxTargetFolder.Text = fbd.SelectedPath;             }         }           private void buttonGo_Click(object sender, EventArgs e)         {             if (_readingThread == null)             {                 _selectedSourceType = this.comboBoxSourceType.Text;                   Thread t = new Thread(new ThreadStart(Run));                 t.Start();                 _readingThread = t;                 SetButtonGoText("Stop");             }             else             {                 Stop();             }         }           void Run()         {                        // Start downloading threads             _finishedReadingTree = new ManualResetEvent(false);             _waitingForStop = new ManualResetEvent(false);             _filesToDownload = new List<FileDownloadData>();               List<Thread> downloadThreads = new List<Thread>();             for (int i = 0; i < 5; i++)             {                 Thread t = new Thread(new ThreadStart(DownloadFilesThread));                 t.Start();                 downloadThreads.Add(t);             }               try             {                 if ((this.textBoxTargetFolder.Text != "") && (this.textBoxSourceSvnUrl.Text != ""))                 {                     string url = this.textBoxSourceSvnUrl.Text;                       if (_selectedSourceType == "GIT")                         RunSvn(this.textBoxTargetFolder.Text, this.textBoxSourceSvnUrl.Text, RepositoryType.GIT);                     else // "SVN"                         RunSvn(this.textBoxTargetFolder.Text, this.textBoxSourceSvnUrl.Text, RepositoryType.SVN);                 }                 else                     WriteToScreen("Parameters not set.");             }             catch (Exception ex)             {                 WriteToScreen("Failed: " + ex);                 lock (_filesToDownload)                 {                     _filesToDownload.Clear();                 }             }             finally             {                 _finishedReadingTree.Set();             }               // Wait for downloading threads             WriteToScreen("Waiting for file downloading threads to finish");             for (int i = 0; i < downloadThreads.Count; i++)                 downloadThreads[i].Join();               WriteToScreen("Done.");             MessageBox.Show("Done", "Done");             _readingThread = null;               SetButtonGoText("Start");         }           delegate void SetButtonGoTextDelegate(string text);         /// <summary>         ///         /// </summary>         /// <param name="text"></param>         void SetButtonGoText(string text)         {             if (InvokeRequired == true)             {                 this.Invoke(new SetButtonGoTextDelegate(SetButtonGoText), text);                 return;             }               buttonGo.Text = text;         }         /// <summary>         ///         /// </summary>         void DownloadFilesThread()         {             while (true)             {                 FileDownloadData fileDownloadData  = null;                 lock (_filesToDownload)                 {                     if (_filesToDownload.Count > 0)                     {                         fileDownloadData = _filesToDownload[0];                         _filesToDownload.RemoveAt(0);                     }                 }                   if ((fileDownloadData == null) && (_finishedReadingTree.WaitOne(0, false) == true))                     return;                   if (fileDownloadData != null)                 {                     bool retry = true;                     while (retry == true)                     {                         if (_waitingForStop.WaitOne(0, false) == true)                             return;                           try                         {                             DownloadFile(fileDownloadData.Url, fileDownloadData.FileName);                             retry = false;                         }                         catch (Exception ex)                         {                             WriteToScreen("Failed to download: " + ex.Message);                         }                     }                 }                 else                 {                     Thread.Sleep(100);                 }             }         }         /// <summary>         ///         /// </summary>         public enum RepositoryType         {             SVN,             GIT         }         /// <summary>         ///         /// </summary>         /// <param name="baseFolder"></param>         /// <param name="baseUrl"></param>         /// <param name="repositoryType"></param>         void RunSvn(string baseFolder, string baseUrl, RepositoryType repositoryType)         {             if (repositoryType == RepositoryType.SVN)             {                 if (baseUrl.EndsWith("/") == false)                     baseUrl += "/";             }               if (baseFolder.EndsWith("\\") == false)                 baseFolder += "\\";               List<FolderLinkData> urls = new List<FolderLinkData>();             urls.Add(new FolderLinkData(baseUrl, ""));               while (urls.Count > 0)             {                 if (_waitingForStop.WaitOne(0, false) == true)                 {                     WriteToScreen("Stopping...");                     lock (_filesToDownload)                     {                         _filesToDownload.Clear();                     }                     break;                 }                   FolderLinkData targetUrlData = urls[0];                 string targetUrl = targetUrlData.Url;                 urls.RemoveAt(0);                   // Create the folder                 string relative;                 if (targetUrlData.RelativePath == null)                     relative = targetUrl.Substring(baseUrl.Length);                 else                     relative = targetUrlData.RelativePath;                   relative = relative.Replace("/", "\\");                 string targetFolder = Path.Combine(baseFolder, relative);                 if (Directory.Exists(targetFolder) == false)                     Directory.CreateDirectory(targetFolder);                   // Download target page                 string page = null;                 bool retry = true;                 while (retry == true)                 {                     if (_waitingForStop.WaitOne(0, false) == true)                         return;                       try                     {                         page = DownloadUrl(targetUrl);                         retry = false;                     }                     catch (Exception ex)                     {                         WriteToScreen("Failed to download: " + ex.Message);                     }                 }                   if (repositoryType == RepositoryType.SVN)                 {                     List<string> links = ParseLinks(page);                       foreach (string link in links)                     {                         string linkFullUrl = targetUrl + link;                         if (linkFullUrl.EndsWith("/") == true)                         {                             urls.Add(new FolderLinkData(linkFullUrl, null));                         }                         else // file - download                         {                             string fileName = targetFolder + link;                             lock (_filesToDownload)                             {                                 _filesToDownload.Add(new FileDownloadData(linkFullUrl, fileName));                             }                         }                     }                 }                 else if (repositoryType == RepositoryType.GIT)                 {                     List<PageLink> links = ParseGitLinks(page);                     int pos = targetUrl.IndexOf("/?");                     string serverUrl = targetUrl.Substring(0, pos);                       foreach (PageLink link in links)                     {                         string linkFullUrl = serverUrl + link.Url;                         if (link.IsFolder == true)                             urls.Add(new FolderLinkData(linkFullUrl, targetUrlData.RelativePath + link.Name + "\\"));                         else                         {                             string fileName = targetFolder + link.Name;                               lock (_filesToDownload)                             {                                 _filesToDownload.Add(new FileDownloadData(linkFullUrl, fileName));                             }                         }                     }                 }             }         }         /// <summary>         ///         /// </summary>         /// <param name="page"></param>         /// <returns></returns>         List<string> ParseLinks(string page)         {             try             {                 return ParseLinksFromXml(page);             }             catch             {                 return ParseLinksFromHtml(page);             }         }         /// <summary>         ///         /// </summary>         /// <param name="page"></param>         /// <returns></returns>         List<string> ParseLinksFromXml(string page)         {             List<string> list = new List<string>();               XmlDocument doc = new XmlDocument();             doc.LoadXml(page);               XmlNode svnNode = doc.SelectSingleNode("/svn");             if (svnNode == null)                 throw new Exception("Not a valid SVN xml");               foreach (XmlNode node in doc.SelectNodes("/svn/index/dir"))             {                 string dir = node.Attributes["href"].Value;                 list.Add(dir);             }               foreach (XmlNode node in doc.SelectNodes("/svn/index/file"))             {                 string file = node.Attributes["href"].Value;                 list.Add(file);             }               return list;         }         /// <summary>         ///         /// </summary>         /// <param name="page"></param>         /// <returns></returns>         List<string> ParseLinksFromHtml(string page)         {             List<string> links = new List<string>();             string listArea = null;               // Find list area: <ul> ... </ul>             int pos = page.IndexOf("<ul>");             if (pos >= 0)             {                 int lastPos = page.IndexOf("</ul>", pos);                 if (lastPos >= 0)                     listArea = page.Substring(pos + 4, lastPos - (pos + 4));             }               if (listArea != null)             {                 string[] lines = listArea.Split('\n');                 string linePattern = "<a [^>]*>([^<]*)<";                 for (int i = 0; i < lines.Length; i++)                 {                     Match match = Regex.Match(lines[i], linePattern);                     if (match.Success == true)                     {                         string linkRelUrl = match.Groups[1].Value;                         if (linkRelUrl != "..")                             links.Add(linkRelUrl);                     }                 }             }               return links;         }         /// <summary>         ///         /// </summary>         /// <param name="page"></param>         /// <returns></returns>         List<PageLink> ParseGitLinks(string page)                {             List<PageLink> links = new List<PageLink>();               string dataStartMarker = "<td class=\"mode\">";             string nameMarker = "hb=HEAD\">";               using (StringReader sr = new StringReader(page))             {                 string line;                 while ((line = sr.ReadLine()) != null)                 {                     if (line.StartsWith(dataStartMarker) == false)                         continue;                       bool isFolder = false;                     if (line[dataStartMarker.Length] == 'd')                         isFolder = true;                       line = sr.ReadLine();                       // Get name                     int pos = line.IndexOf(nameMarker);                     int endPos = line.IndexOf("<", pos);                     pos += nameMarker.Length;                       string name = line.Substring(pos, endPos - pos);                       if ((name == "..") || (name == "."))                         continue;                       // Get URL                     pos = line.IndexOf("href=\"");                     endPos = line.IndexOf("\">", pos);                     pos += "href=\"".Length;                     string url = line.Substring(pos, endPos - pos);                     if (isFolder == false)                     {                         url = url.Replace(";a=blob;", ";a=blob_plain;");                           pos = url.IndexOf(";h=");                         url = url.Substring(0, pos);                         url = url + ";hb=HEAD";                     }                       if (url.Contains(";a=tree;"))                         isFolder = true;                       links.Add(new PageLink(name, url, isFolder));                 }             }               return links;         }           #region Download helper functions         /// <summary>         ///         /// </summary>         /// <param name="url"></param>         /// <param name="fileName"></param>         void DownloadFile(string url, string fileName)         {             WriteToScreen("Downloading File: " + url);               WebRequest webRequest = WebRequest.Create(url);             webRequest.ContentType = "text/html; charset=utf-8"; //考虑乱码问题             webRequest.Timeout = 50000;             WebResponse webResponse = null;             Stream responseStream = null;             try             {                 webResponse = webRequest.GetResponse();                 responseStream = webResponse.GetResponseStream();                 //  string  page = new StreamReader(responseStream, Encoding.UTF8, true).ReadToEnd();                 using (FileStream fs = new FileStream(fileName, FileMode.Create))                 {                     byte[] buffer = new byte[1024];                     int readSize;                     while ((readSize = responseStream.Read(buffer, 0, buffer.Length)) > 0)                     {                         fs.Write(buffer, 0, readSize);                     }                 }             }             finally             {                 if (responseStream != null)                     responseStream.Close();                   if (webResponse != null)                     webResponse.Close();             }         }         /// <summary>         ///         /// </summary>         /// <param name="url"></param>         /// <returns></returns>         string DownloadUrl(string url)         {             WriteToScreen("Downloading: " + url);             using (WebClient client = new WebClient())             {                 client.Encoding = System.Text.Encoding.UTF8; //GetEncoding("utf-8"); //考虑乱码问题                 string data = client.DownloadString(url);                   return data;             }         }         #endregion           delegate void WriteToScreenDelegate(string str);         /// <summary>         ///         /// </summary>         /// <param name="str"></param>         void WriteToScreen(string str)         {             if (this.InvokeRequired)             {                 this.Invoke(new WriteToScreenDelegate(WriteToScreen), str);                 return;             }               this.richTextBox1.AppendText(str + "\n");             this.richTextBox1.ScrollToCaret();         }           private void buttonClose_Click(object sender, EventArgs e)         {             this.Close();         }           private void Stop()         {             _waitingForStop.Set();         }           private void MainForm_FormClosing(object sender, FormClosingEventArgs e)         {             if (_readingThread != null)             {                 Stop();                 e.Cancel = true;             }         }     }       public class PageLink     {         string _name;         string _url;         bool _isFolder;           public string Name { get { return _name; } }         public string Url { get { return _url; } }         public bool IsFolder { get { return _isFolder; } }           public PageLink(string name, string url, bool isFolder)         {             _name = name;             _url = url;             _isFolder = isFolder;         }     }     /// <summary>     ///     /// </summary>     public class FolderLinkData     {         string _url;         string _relativePath;           public string Url { get { return _url; } }         public string RelativePath { get { return _relativePath; } }           public FolderLinkData(string url, string relativePath)         {             _url = url;             _relativePath = relativePath;         }     }     /// <summary>     ///     /// </summary>     public class FileDownloadData     {         string _url;         string _fileName;           public string Url         {             get { return _url; }         }           public string FileName         {             get { return _fileName; }         }           public FileDownloadData(string url, string fileName)         {             _url = url;             _fileName = fileName;         }     } }