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|
namespace FTP
{
#region "FTP client class"
/// <summary>
/// A wrapper class for .NET 2.0 FTP
/// </summary>
/// <remarks>
/// This class does not hold open an FTP connection but
/// instead is stateless: for each FTP request it
/// connects, performs the request and disconnects.
/// </remarks>
public class FTPclient
{
#region "CONSTRUCTORS"
/// <summary>
/// Blank constructor
/// </summary>
/// <remarks>Hostname, username and password must be set manually</remarks>
public FTPclient()
{
}
/// <summary>
/// Constructor just taking the hostname
/// </summary>
/// <param name="Hostname">in either ftp://ftp.host.com or ftp.host.com form</param>
/// <remarks></remarks>
public FTPclient(string Hostname)
{
_hostname = Hostname;
}
/// <summary>
/// Constructor taking hostname, username and password
/// </summary>
/// <param name="Hostname">in either ftp://ftp.host.com or ftp.host.com form</param>
/// <param name="Username">Leave blank to use 'anonymous' but set password to your email</param>
/// <param name="Password"></param>
/// <remarks></remarks>
public FTPclient(string Hostname, string Username, string Password)
{
_hostname = Hostname;
_username = Username;
_password = Password;
}
#endregion
#region "Directory functions"
/// <summary>
/// Return a simple directory listing
/// </summary>
/// <param name="directory">Directory to list, e.g. /pub</param>
/// <returns>A list of filenames and directories as a List(of String)</returns>
/// <remarks>For a detailed directory listing, use ListDirectoryDetail</remarks>
public List<string> ListDirectory(string directory)
{
//return a simple list of filenames in directory
System.Net.FtpWebRequest ftp = GetRequest(GetDirectory(directory));
//Set request to do simple list
ftp.Method = System.Net.WebRequestMethods.Ftp.ListDirectory;
string str = GetStringResponse(ftp);
//replace CRLF to CR, remove last instance
str = str.Replace("\r\n", "\r").TrimEnd('\r');
//split the string into a list
List<string> result = new List<string>();
result.AddRange(str.Split('\r'));
return result;
}
/// <summary>
/// Return a detailed directory listing
/// </summary>
/// <param name="directory">Directory to list, e.g. /pub/etc</param>
/// <returns>An FTPDirectory object</returns>
public FTPdirectory ListDirectoryDetail(string directory)
{
System.Net.FtpWebRequest ftp = GetRequest(GetDirectory(directory));
//Set request to do simple list
ftp.Method = System.Net.WebRequestMethods.Ftp.ListDirectoryDetails;
string str = GetStringResponse(ftp);
//replace CRLF to CR, remove last instance
str = str.Replace("\r\n", "\r").TrimEnd('\r');
//split the string into a list
return new FTPdirectory(str, _lastDirectory);
}
#endregion
#region "Upload: File transfer TO ftp server"
/// <summary>
/// Copy a local file to the FTP server
/// </summary>
/// <param name="localFilename">Full path of the local file</param>
/// <param name="targetFilename">Target filename, if required</param>
/// <returns></returns>
/// <remarks>If the target filename is blank, the source filename is used
/// (assumes current directory). Otherwise use a filename to specify a name
/// or a full path and filename if required.</remarks>
public bool Upload(string localFilename, string targetFilename)
{
//1. check source
if (!File.Exists(localFilename))
{
throw (new ApplicationException("File " + localFilename + " not found"));
}
//copy to FI
FileInfo fi = new FileInfo(localFilename);
return Upload(fi, targetFilename);
}
/// <summary>
/// Upload a local file to the FTP server
/// </summary>
/// <param name="fi">Source file</param>
/// <param name="targetFilename">Target filename (optional)</param>
/// <returns></returns>
public bool Upload(FileInfo fi, string targetFilename)
{
//copy the file specified to target file: target file can be full path or just filename (uses current dir)
//1. check target
string target;
if (targetFilename.Trim() == "")
{
//Blank target: use source filename & current dir
target = this.CurrentDirectory + fi.Name;
}
else if (targetFilename.Contains("/"))
{
//If contains / treat as a full path
target = AdjustDir(targetFilename);
}
else
{
//otherwise treat as filename only, use current directory
target = CurrentDirectory + targetFilename;
}
string URI = Hostname + target;
//perform copy
System.Net.FtpWebRequest ftp = GetRequest(URI);
//Set request to upload a file in binary
ftp.Method = System.Net.WebRequestMethods.Ftp.UploadFile;
ftp.UseBinary = true;
//Notify FTP of the expected size
ftp.ContentLength = fi.Length;
//create byte array to store: ensure at least 1 byte!
const int BufferSize = 2048;
byte[] content = new byte[BufferSize - 1 + 1];
int dataRead;
//open file for reading
using (FileStream fs = fi.OpenRead())
{
try
{
//open request to send
using (Stream rs = ftp.GetRequestStream())
{
do
{
dataRead = fs.Read(content, 0, BufferSize);
rs.Write(content, 0, dataRead);
} while (!(dataRead < BufferSize));
rs.Close();
}
}
catch (Exception)
{
}
finally
{
//ensure file closed
fs.Close();
}
}
ftp = null;
return true;
}
#endregion
#region "Download: File transfer FROM ftp server"
/// <summary>
/// Copy a file from FTP server to local
/// </summary>
/// <param name="sourceFilename">Target filename, if required</param>
/// <param name="localFilename">Full path of the local file</param>
/// <returns></returns>
/// <remarks>Target can be blank (use same filename), or just a filename
/// (assumes current directory) or a full path and filename</remarks>
public bool Download(string sourceFilename, string localFilename, bool PermitOverwrite)
{
//2. determine target file
FileInfo fi = new FileInfo(localFilename);
return this.Download(sourceFilename, fi, PermitOverwrite);
}
//Version taking an FtpFileInfo
public bool Download(FTPfileInfo file, string localFilename, bool PermitOverwrite)
{
return this.Download(file.FullName, localFilename, PermitOverwrite);
}
//Another version taking FtpFileInfo and FileInfo
public bool Download(FTPfileInfo file, FileInfo localFI, bool PermitOverwrite)
{
return this.Download(file.FullName, localFI, PermitOverwrite);
}
//Version taking string/FileInfo
public bool Download(string sourceFilename, FileInfo targetFI, bool PermitOverwrite)
{
//1. check target
if (targetFI.Exists && !(PermitOverwrite))
{
throw (new ApplicationException("Target file already exists"));
}
//2. check source
string target;
if (sourceFilename.Trim() == "")
{
throw (new ApplicationException("File not specified"));
}
else if (sourceFilename.Contains("/"))
{
//treat as a full path
target = AdjustDir(sourceFilename);
}
else
{
//treat as filename only, use current directory
target = CurrentDirectory + sourceFilename;
}
string URI = Hostname + target;
//3. perform copy
System.Net.FtpWebRequest ftp = GetRequest(URI);
//Set request to download a file in binary mode
ftp.Method = System.Net.WebRequestMethods.Ftp.DownloadFile;
ftp.UseBinary = true;
//open request and get response stream
using (FtpWebResponse response = (FtpWebResponse)ftp.GetResponse())
{
using (Stream responseStream = response.GetResponseStream())
{
//loop to read & write to file
using (FileStream fs = targetFI.OpenWrite())
{
try
{
byte[] buffer = new byte[2048];
int read = 0;
do
{
read = responseStream.Read(buffer, 0, buffer.Length);
fs.Write(buffer, 0, read);
} while (!(read == 0));
responseStream.Close();
fs.Flush();
fs.Close();
}
catch (Exception)
{
//catch error and delete file only partially downloaded
fs.Close();
//delete target file as it's incomplete
targetFI.Delete();
throw;
}
}
responseStream.Close();
}
response.Close();
}
return true;
}
#endregion
#region "Other functions: Delete rename etc."
/// <summary>
/// Delete remote file
/// </summary>
/// <param name="filename">filename or full path</param>
/// <returns></returns>
/// <remarks></remarks>
public bool FtpDelete(string filename)
{
//Determine if file or full path
string URI = this.Hostname + GetFullPath(filename);
System.Net.FtpWebRequest ftp = GetRequest(URI);
//Set request to delete
ftp.Method = System.Net.WebRequestMethods.Ftp.DeleteFile;
try
{
//get response but ignore it
string str = GetStringResponse(ftp);
}
catch (Exception)
{
return false;
}
return true;
}
/// <summary>
/// Determine if file exists on remote FTP site
/// </summary>
/// <param name="filename">Filename (for current dir) or full path</param>
/// <returns></returns>
/// <remarks>Note this only works for files</remarks>
public bool FtpFileExists(string filename)
{
//Try to obtain filesize: if we get error msg containing "550"
//the file does not exist
try
{
long size = GetFileSize(filename);
return true;
}
catch (Exception ex)
{
//only handle expected not-found exception
if (ex is System.Net.WebException)
{
//file does not exist/no rights error = 550
if (ex.Message.Contains("550"))
{
//clear
return false;
}
else
{
throw;
}
}
else
{
throw;
}
}
}
/// <summary>
/// Determine size of remote file
/// </summary>
/// <param name="filename"></param>
/// <returns></returns>
/// <remarks>Throws an exception if file does not exist</remarks>
public long GetFileSize(string filename)
{
string path;
if (filename.Contains("/"))
{
path = AdjustDir(filename);
}
else
{
path = this.CurrentDirectory + filename;
}
string URI = this.Hostname + path;
System.Net.FtpWebRequest ftp = GetRequest(URI);
//Try to get info on file/dir?
ftp.Method = System.Net.WebRequestMethods.Ftp.GetFileSize;
string tmp = this.GetStringResponse(ftp);
return GetSize(ftp);
}
public bool FtpRename(string sourceFilename, string newName)
{
//Does file exist?
string source = GetFullPath(sourceFilename);
if (!FtpFileExists(source))
{
throw (new FileNotFoundException("File " + source + " not found"));
}
//build target name, ensure it does not exist
string target = GetFullPath(newName);
if (target == source)
{
throw (new ApplicationException("Source and target are the same"));
}
else if (FtpFileExists(target))
{
throw (new ApplicationException("Target file " + target + " already exists"));
}
//perform rename
string URI = this.Hostname + source;
System.Net.FtpWebRequest ftp = GetRequest(URI);
//Set request to delete
ftp.Method = System.Net.WebRequestMethods.Ftp.Rename;
ftp.RenameTo = target;
try
{
//get response but ignore it
string str = GetStringResponse(ftp);
}
catch (Exception)
{
return false;
}
return true;
}
public bool FtpCreateDirectory(string dirpath)
{
//perform create
string URI = this.Hostname + AdjustDir(dirpath);
System.Net.FtpWebRequest ftp = GetRequest(URI);
//Set request to MkDir
ftp.Method = System.Net.WebRequestMethods.Ftp.MakeDirectory;
try
{
//get response but ignore it
string str = GetStringResponse(ftp);
}
catch (Exception)
{
return false;
}
return true;
}
public bool FtpDeleteDirectory(string dirpath)
{
//perform remove
string URI = this.Hostname + AdjustDir(dirpath);
System.Net.FtpWebRequest ftp = GetRequest(URI);
//Set request to RmDir
ftp.Method = System.Net.WebRequestMethods.Ftp.RemoveDirectory;
try
{
//get response but ignore it
string str = GetStringResponse(ftp);
}
catch (Exception)
{
return false;
}
return true;
}
#endregion
#region "private supporting fns"
//Get the basic FtpWebRequest object with the
//common settings and security
private FtpWebRequest GetRequest(string URI)
{
//create request
FtpWebRequest result = (FtpWebRequest)FtpWebRequest.Create(URI);
//Set the login details
result.Credentials = GetCredentials();
//Do not keep alive (stateless mode)
result.KeepAlive = false;
return result;
}
/// <summary>
/// Get the credentials from username/password
/// </summary>
private System.Net.ICredentials GetCredentials()
{
return new System.Net.NetworkCredential(Username, Password);
}
/// <summary>
/// returns a full path using CurrentDirectory for a relative file reference
/// </summary>
private string GetFullPath(string file)
{
if (file.Contains("/"))
{
return AdjustDir(file);
}
else
{
return this.CurrentDirectory + file;
}
}
/// <summary>
/// Amend an FTP path so that it always starts with /
/// </summary>
/// <param name="path">Path to adjust</param>
/// <returns></returns>
/// <remarks></remarks>
private string AdjustDir(string path)
{
return ((path.StartsWith("/")) ? "" : "/").ToString() + path;
}
private string GetDirectory(string directory)
{
string URI;
if (directory == "")
{
//build from current
URI = Hostname + this.CurrentDirectory;
_lastDirectory = this.CurrentDirectory;
}
else
{
if (!directory.StartsWith("/"))
{
throw (new ApplicationException("Directory should start with /"));
}
URI = this.Hostname + directory;
_lastDirectory = directory;
}
return URI;
}
//stores last retrieved/set directory
private string _lastDirectory = "";
/// <summary>
/// Obtains a response stream as a string
/// </summary>
/// <param name="ftp">current FTP request</param>
/// <returns>String containing response</returns>
/// <remarks>FTP servers typically return strings with CR and
/// not CRLF. Use respons.Replace(vbCR, vbCRLF) to convert
/// to an MSDOS string</remarks>
private string GetStringResponse(FtpWebRequest ftp)
{
//Get the result, streaming to a string
string result = "";
using (FtpWebResponse response = (FtpWebResponse)ftp.GetResponse())
{
long size = response.ContentLength;
using (Stream datastream = response.GetResponseStream())
{
using (StreamReader sr = new StreamReader(datastream))
{
result = sr.ReadToEnd();
sr.Close();
}
datastream.Close();
}
response.Close();
}
return result;
}
/// <summary>
/// Gets the size of an FTP request
/// </summary>
/// <param name="ftp"></param>
/// <returns></returns>
/// <remarks></remarks>
private long GetSize(FtpWebRequest ftp)
{
long size;
using (FtpWebResponse response = (FtpWebResponse)ftp.GetResponse())
{
size = response.ContentLength;
response.Close();
}
return size;
}
#endregion
#region "Properties"
private string _hostname;
/// <summary>
/// Hostname
/// </summary>
/// <value></value>
/// <remarks>Hostname can be in either the full URL format
/// ftp://ftp.myhost.com or just ftp.myhost.com
/// </remarks>
public string Hostname
{
get
{
if (_hostname.StartsWith("ftp://"))
{
return _hostname;
}
else
{
return "ftp://" + _hostname;
}
}
set
{
_hostname = value;
}
}
private string _username;
/// <summary>
/// Username property
/// </summary>
/// <value></value>
/// <remarks>Can be left blank, in which case 'anonymous' is returned</remarks>
public string Username
{
get
{
return (_username == "" ? "anonymous" : _username);
}
set
{
_username = value;
}
}
private string _password;
public string Password
{
get
{
return _password;
}
set
{
_password = value;
}
}
/// <summary>
/// The CurrentDirectory value
/// </summary>
/// <remarks>Defaults to the root '/'</remarks>
private string _currentDirectory = "/";
public string CurrentDirectory
{
get
{
//return directory, ensure it ends with /
return _currentDirectory + ((_currentDirectory.EndsWith("/")) ? "" : "/").ToString();
}
set
{
if (!value.StartsWith("/"))
{
throw (new ApplicationException("Directory should start with /"));
}
_currentDirectory = value;
}
}
#endregion
}
#endregion
} |
Ftp+C# download mode console
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