/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 4 -*- */

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsIOService.h"

#include "nsFtpControlConnection.h"

#include "nsFtpProtocolHandler.h"

#include "mozilla/Logging.h"

#include "nsIInputStream.h"

#include "nsISocketTransportService.h"

#include "nsISocketTransport.h"

#include "nsThreadUtils.h"

#include "nsIOutputStream.h"

#include "nsNetCID.h"

#include <algorithm>

using namespace mozilla;

using namespace mozilla::net;

extern LazyLogModule gFTPLog;

#define LOG(args) MOZ_LOG(gFTPLog, mozilla::LogLevel::Debug, args)

#define LOG_INFO(args) MOZ_LOG(gFTPLog, mozilla::LogLevel::Info, args)

//

// nsFtpControlConnection implementation ...

//

NS_IMPL_ISUPPORTS(nsFtpControlConnection, nsIInputStreamCallback)

NS_IMETHODIMP

nsFtpControlConnection::OnInputStreamReady(nsIAsyncInputStream* stream) {

  char data[4096];

  // Consume data whether we have a listener or not.

  uint64_t avail64;

  uint32_t avail = 0;

  nsresult rv = stream->Available(&avail64);

  if (NS_SUCCEEDED(rv)) {

    avail = (uint32_t)std::min(avail64, (uint64_t)sizeof(data));

    uint32_t n;

    rv = stream->Read(data, avail, &n);

    if (NS_SUCCEEDED(rv)) avail = n;

  }

  // It's important that we null out mListener before calling one of its

  // methods as it may call WaitData, which would queue up another read.

  RefPtr<nsFtpControlConnectionListener> listener;

  listener.swap(mListener);

  if (!listener) return NS_OK;

  if (NS_FAILED(rv)) {

    listener->OnControlError(rv);

  } else {

    listener->OnControlDataAvailable(data, avail);

  }

  return NS_OK;

}

nsFtpControlConnection::nsFtpControlConnection(const nsACString& host,

                                               uint32_t port)

    : mServerType(0),

      mSessionId(gFtpHandler->GetSessionId()),

      mUseUTF8(false),

      mHost(host),

      mPort(port) {

  LOG_INFO(("FTP:CC created @%p", this));

}

nsFtpControlConnection::~nsFtpControlConnection() {

  LOG_INFO(("FTP:CC destroyed @%p", this));

}

bool nsFtpControlConnection::IsAlive() {

  if (!mSocket) return false;

  bool isAlive = false;

  mSocket->IsAlive(&isAlive);

  return isAlive;

}

nsresult nsFtpControlConnection::Connect(nsIProxyInfo* proxyInfo,

                                         nsITransportEventSink* eventSink) {

  if (mSocket) return NS_OK;

  // build our own

  nsresult rv;

  nsCOMPtr<nsISocketTransportService> sts =

      do_GetService(NS_SOCKETTRANSPORTSERVICE_CONTRACTID, &rv;;

  if (NS_FAILED(rv)) return rv;

  rv = sts->CreateTransport(nullptr, 0, mHost, mPort, proxyInfo,

                            getter_AddRefs(mSocket));  // the command transport

  if (NS_FAILED(rv)) return rv;

  mSocket->SetQoSBits(gFtpHandler->GetControlQoSBits());

  // proxy transport events back to current thread

  if (eventSink)

    mSocket->SetEventSink(eventSink, GetCurrentThreadEventTarget());

  // open buffered, blocking output stream to socket.  so long as commands

  // do not exceed 1024 bytes in length, the writing thread (the main thread)

  // will not block.  this should be OK.

  rv = mSocket->OpenOutputStream(nsITransport::OPEN_BLOCKING, 1024, 1,

                                 getter_AddRefs(mSocketOutput));

  if (NS_FAILED(rv)) return rv;

  // open buffered, non-blocking/asynchronous input stream to socket.

  nsCOMPtr<nsIInputStream> inStream;

  rv = mSocket->OpenInputStream(0, nsIOService::gDefaultSegmentSize,

                                nsIOService::gDefaultSegmentCount,

                                getter_AddRefs(inStream));

  if (NS_SUCCEEDED(rv)) mSocketInput = do_QueryInterface(inStream);

  return rv;

}

nsresult nsFtpControlConnection::WaitData(

    nsFtpControlConnectionListener* listener) {

  LOG(("FTP:(%p) wait data [listener=%p]\n", this, listener));

  // If listener is null, then simply disconnect the listener.  Otherwise,

  // ensure that we are listening.

  if (!listener) {

    mListener = nullptr;

    return NS_OK;

  }

  NS_ENSURE_STATE(mSocketInput);

  mListener = listener;

  return mSocketInput->AsyncWait(this, 0, 0, GetCurrentThreadEventTarget());

}

nsresult nsFtpControlConnection::Disconnect(nsresult status) {

  if (!mSocket) return NS_OK;  // already disconnected

  LOG_INFO(("FTP:(%p) CC disconnecting (%" PRIx32 ")", this,

            static_cast<uint32_t>(status)));

  if (NS_FAILED(status)) {

    // break cyclic reference!

    mSocket->Close(status);

    mSocket = nullptr;

    mSocketInput->AsyncWait(nullptr, 0, 0, nullptr);  // clear any observer

    mSocketInput = nullptr;

    mSocketOutput = nullptr;

  }

  return NS_OK;

}

nsresult nsFtpControlConnection::Write(const nsACString& command) {

  NS_ENSURE_STATE(mSocketOutput);

  uint32_t len = command.Length();

  uint32_t cnt;

  nsresult rv = mSocketOutput->Write(command.Data(), len, &cnt);

  if (NS_FAILED(rv)) return rv;

  if (len != cnt) return NS_ERROR_FAILURE;

  return NS_OK;

}