/// <summary>Initializes a new instance of the <see cref="FtpAccessEventArgs" /> class.</summary>
/// <param name="client">The client.</param>
/// <param name="accessType">Type of the access.</param>
/// <param name="ftpName">Name of the FTP.</param>
/// <param name="ftpFolder">The FTP folder.</param>
/// <param name="fileSystemDirectory">The file system directory.</param>
/// <param name="entries">The entries.</param>
public FtpAccessEventArgs(FtpServerClient client, FtpAccessType accessType, string ftpName, string ftpFolder, string fileSystemDirectory, FtpDirectoryEntry[] entries)
{
Client = client;
AccessType = accessType;
FileSystemDirectory = fileSystemDirectory;
FtpFolder = ftpFolder;
FtpName = ftpName;
Entries = entries;
}
bool CheckAccess(FtpAccessType accessType, string ftpName)
{
bool allow = false;
string fileSystemDir = null;
if (ftpName.Contains("/"))
{
//absolute path
if (ftpName == "/")
{
allow = true;
}
else
{
string[] parts = ftpName.Split(new char[] { '/' }, StringSplitOptions.RemoveEmptyEntries);
if (Server.RootFolders.TryGetValue(parts.FirstOrDefault(), out string root))
{
string ftpDir = FileSystem.Combine('/', currentFtpFolder, ftpName);
if (!ftpDir.StartsWith(".."))
{
fileSystemDir = FileSystem.Combine(root, parts.SubRange(1).Join('/'));
}
}
}
}
else
{
if (currentFileSystemDirectory == null)
{
if (Server.RootFolders.TryGetValue(ftpName, out string root))
{
fileSystemDir = root;
}
}
else
{
string ftpDir = FileSystem.Combine('/', currentFtpFolder, ftpName);
if (ftpDir == "/")
{
fileSystemDir = null;
allow = true;
}
else if (!ftpDir.StartsWith(".."))
{
fileSystemDir = FileSystem.Combine(currentFileSystemDirectory, ftpName);
}
}
}
if (fileSystemDir != null)
{
switch (accessType)
{
case FtpAccessType.CreateDirectory:
{
allow = !Directory.Exists(fileSystemDir);
break;
}
case FtpAccessType.ChangeDirectory:
case FtpAccessType.ListDirectory:
case FtpAccessType.DeleteDirectory:
{
allow = Directory.Exists(fileSystemDir);
break;
}
case FtpAccessType.UploadFile:
{
allow = true;
break;
}
case FtpAccessType.DeleteFile:
case FtpAccessType.DownloadFile:
{
allow = File.Exists(fileSystemDir);
break;
}
case FtpAccessType.RenameFrom:
{
allow = File.Exists(fileSystemDir) || Directory.Exists(fileSystemDir);
break;
}
case FtpAccessType.RenameTo:
{
allow = !File.Exists(fileSystemDir) && !Directory.Exists(fileSystemDir);
break;
}
default: throw new NotImplementedException();
}
}
if (!allow)
{
SendAnswer("550 Requested action not taken.");
return(false);
}
FtpAccessEventArgs e = new FtpAccessEventArgs(this, accessType, currentFileSystemDirectory, currentFtpFolder, ftpName, null);
Server.OnCheckAccess(e);
if (e.Denied)
{
SendAnswer("550 Requested action not taken. Access denied.");
return(false);
}
return(true);
}