/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 "mozilla/dom/ChannelInfo.h"
#include "nsCOMPtr.h"
#include "nsIChannel.h"
#include "nsIDocument.h"
#include "nsIHttpChannel.h"
#include "nsSerializationHelper.h"
#include "mozilla/net/HttpBaseChannel.h"
#include "mozilla/ipc/ChannelInfo.h"
#include "nsIJARChannel.h"
#include "nsJARChannel.h"
#include "nsNetUtil.h"

using namespace mozilla;
using namespace mozilla::dom;

void
ChannelInfo::InitFromDocument(nsIDocument* aDoc)
{
  MOZ_ASSERT(NS_IsMainThread());
  MOZ_ASSERT(!mInited, "Cannot initialize the object twice");

  nsCOMPtr<nsISupports> securityInfo = aDoc->GetSecurityInfo();
  if (securityInfo) {
    SetSecurityInfo(securityInfo);
  }

  // mRedirected flag and mRedirectedURISpec are only important for maintaining
  // the channel's redirected status.  If the ChannelInfo is initialized from
  // a document, that document has already asked the channel from which it was
  // loaded about the current channel URI, so it won't matter if a future
  // ResurrectInfoOnChannel() call misses whether the channel was redirected.
  mRedirected = false;
  mInited = true;
}

void
ChannelInfo::InitFromChannel(nsIChannel* aChannel)
{
  MOZ_ASSERT(NS_IsMainThread());
  MOZ_ASSERT(!mInited, "Cannot initialize the object twice");

  nsCOMPtr<nsISupports> securityInfo;
  aChannel->GetSecurityInfo(getter_AddRefs(securityInfo));
  if (securityInfo) {
    SetSecurityInfo(securityInfo);
  }

  nsLoadFlags loadFlags = 0;
  aChannel->GetLoadFlags(&loadFlags);
  mRedirected = (loadFlags & nsIChannel::LOAD_REPLACE);
  if (mRedirected) {
    // Save the spec and not the nsIURI object itself, since those objects are
    // not thread-safe, and releasing them somewhere other than the main thread
    // is not possible.
    nsCOMPtr<nsIURI> redirectedURI;
    aChannel->GetURI(getter_AddRefs(redirectedURI));
    if (redirectedURI) {
      redirectedURI->GetSpec(mRedirectedURISpec);
    }
  }

  mInited = true;
}

void
ChannelInfo::InitFromIPCChannelInfo(const ipc::IPCChannelInfo& aChannelInfo)
{
  MOZ_ASSERT(!mInited, "Cannot initialize the object twice");

  mSecurityInfo = aChannelInfo.securityInfo();
  mRedirectedURISpec = aChannelInfo.redirectedURI();
  mRedirected = aChannelInfo.redirected();

  mInited = true;
}

void
ChannelInfo::SetSecurityInfo(nsISupports* aSecurityInfo)
{
  MOZ_ASSERT(mSecurityInfo.IsEmpty(), "security info should only be set once");
  nsCOMPtr<nsISerializable> serializable = do_QueryInterface(aSecurityInfo);
  if (!serializable) {
    NS_WARNING("A non-serializable object was passed to InternalResponse::SetSecurityInfo");
    return;
  }
  NS_SerializeToString(serializable, mSecurityInfo);
}

nsresult
ChannelInfo::ResurrectInfoOnChannel(nsIChannel* aChannel)
{
  MOZ_ASSERT(NS_IsMainThread());
  MOZ_ASSERT(mInited);

  // These pointers may be null at this point.  They must be checked before
  // being dereferenced.
  nsCOMPtr<nsIHttpChannel> httpChannel =
    do_QueryInterface(aChannel);
  nsCOMPtr<nsIJARChannel> jarChannel =
    do_QueryInterface(aChannel);

  if (!mSecurityInfo.IsEmpty()) {
    nsCOMPtr<nsISupports> infoObj;
    nsresult rv = NS_DeserializeObject(mSecurityInfo, getter_AddRefs(infoObj));
    if (NS_WARN_IF(NS_FAILED(rv))) {
      return rv;
    }
    if (httpChannel) {
      net::HttpBaseChannel* httpBaseChannel =
        static_cast<net::HttpBaseChannel*>(httpChannel.get());
      rv = httpBaseChannel->OverrideSecurityInfo(infoObj);
      if (NS_WARN_IF(NS_FAILED(rv))) {
        return rv;
      }
    } else {
      if (NS_WARN_IF(!jarChannel)) {
        return NS_ERROR_FAILURE;
      }
      static_cast<nsJARChannel*>(jarChannel.get())->
        OverrideSecurityInfo(infoObj);
    }
  }

  if (mRedirected) {
    nsLoadFlags flags = 0;
    aChannel->GetLoadFlags(&flags);
    flags |= nsIChannel::LOAD_REPLACE;
    aChannel->SetLoadFlags(flags);

    nsCOMPtr<nsIURI> redirectedURI;
    nsresult rv = NS_NewURI(getter_AddRefs(redirectedURI),
                            mRedirectedURISpec);
    if (NS_WARN_IF(NS_FAILED(rv))) {
      return rv;
    }
    if (httpChannel) {
      net::HttpBaseChannel* httpBaseChannel =
        static_cast<net::HttpBaseChannel*>(httpChannel.get());
      rv = httpBaseChannel->OverrideURI(redirectedURI);
      if (NS_WARN_IF(NS_FAILED(rv))) {
        return rv;
      }
    } else {
      if (NS_WARN_IF(!jarChannel)) {
        return NS_ERROR_FAILURE;
      }
      static_cast<nsJARChannel*>(jarChannel.get())->OverrideURI(redirectedURI);
    }
  }

  return NS_OK;
}

ipc::IPCChannelInfo
ChannelInfo::AsIPCChannelInfo() const
{
  // This may be called when mInited is false, for example if we try to store
  // a synthesized Response object into the Cache.  Uninitialized and empty
  // ChannelInfo objects are indistinguishable at the IPC level, so this is
  // fine.

  IPCChannelInfo ipcInfo;

  ipcInfo.securityInfo() = mSecurityInfo;
  ipcInfo.redirectedURI() = mRedirectedURISpec;
  ipcInfo.redirected() = mRedirected;

  return ipcInfo;
}