public static void BufferNotDetached(IArrayBufferView buffer)
{
Guard.ArgumentNotNull(buffer, "buffer");
if (buffer.Buffer.IsDetached)
{
throw new EcmaTypeErrorException(InternalString.Error.BufferDetached);
}
}
/// <summary>
/// Verifies user authentication status and performs all necessary actions for the command.
/// </summary>
/// <param name="arguments">Command arguments</param>
/// <param name="session">FTP session context</param>
/// <param name="cancellation">Cancellation token</param>
/// <returns>A <see cref="Task"/> that represents an asynchronous operation.</returns>
public override async Task Handle(IArrayBufferView arguments, FtpSessionState session, CancellationToken cancellation)
{
if (session.FileSystem == null)
{
await session.ControlChannel.Send(FtpResponses.NotLoggedIn, cancellation);
return;
}
await base.Handle(arguments, session, cancellation);
}
/// <summary>
/// Processes the command and writes the response in the control channel.
/// </summary>
/// <param name="command">Command name</param>
/// <param name="arguments">Command arguments</param>
/// <param name="cancellation">Cancellation token</param>
/// <returns>A <see cref="Task"/> that represents an asynchronous operation.</returns>
protected override async Task OnCommand(string command, IArrayBufferView arguments, CancellationToken cancellation)
{
IFtpCommand commandHandler;
if (supportedCommands.TryGetValue(command, out commandHandler))
{
try
{
await commandHandler.Handle(arguments, session, cancellation);
}
catch (Exception error)
{
session.Logger.WriteError(error.Message);
await Send(FtpResponses.InternalError, cancellation);
}
}
else
{
session.Logger.WriteWarning(TraceResources.CommandNotSupported);
await Send(FtpResponses.NotImplemented, cancellation);
}
}
/// <summary>
/// Converts command arguments from binary form to string using current paths encoding.
/// </summary>
/// <param name="arguments">Arguments in binary form</param>
/// <param name="session">FTP session context</param>
/// <returns>Command arguments as string.</returns>
protected override string ReadArguments(IArrayBufferView arguments, FtpSessionState session)
{
return(arguments.ToString(session.PathEncoding));
}
/// <summary>
/// Converts command arguments from binary form to string using current control channel encoding.
/// </summary>
/// <param name="arguments">Arguments in binary form</param>
/// <param name="session">FTP session context</param>
/// <returns>Command arguments as string.</returns>
protected virtual string ReadArguments(IArrayBufferView arguments, FtpSessionState session)
{
return(arguments.ToString(session.ControlEncoding));
}
/// <summary>
/// Cleans up volatile session state and performs all necessary actions for the command.
/// </summary>
/// <param name="arguments">Command arguments</param>
/// <param name="session">FTP session context</param>
/// <param name="cancellation">Cancellation token</param>
/// <returns>A <see cref="Task"/> that represents an asynchronous operation.</returns>
public virtual async Task Handle(IArrayBufferView arguments, FtpSessionState session, CancellationToken cancellation)
{
CleanupRenameSource(session);
CleanupTransferRestartOffset(session);
await HandleCommand(ReadArguments(arguments, session), session, cancellation);
}
/// <summary> /// Processes the command received from the client. /// </summary> /// <param name="command">Command name</param> /// <param name="arguments">Command arguments</param> /// <param name="cancellation">Cancellation token</param> /// <returns>A <see cref="Task"/> that represents an asynchronous operation.</returns> protected abstract Task OnCommand(string command, IArrayBufferView arguments, CancellationToken cancellation);