/* 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/DebugOnly.h"

#include "ExternalHelperAppParent.h"
#include "nsExternalHelperAppService.h"
#include "nsIContent.h"
#include "nsCExternalHandlerService.h"
#include "nsIExternalHelperAppService.h"
#include "mozilla/dom/ContentParent.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/BrowserParent.h"
#include "nsStringStream.h"
#include "mozilla/ipc/URIUtils.h"
#include "nsNetUtil.h"
#include "mozilla/dom/Document.h"
#include "mozilla/dom/CanonicalBrowsingContext.h"
#include "mozilla/dom/WindowGlobalParent.h"
#include "nsQueryObject.h"

using namespace mozilla::ipc;

namespace mozilla {
namespace dom {

NS_IMPL_ISUPPORTS_INHERITED(ExternalHelperAppParent, nsHashPropertyBag,
                            nsIRequest, nsIChannel, nsIMultiPartChannel,
                            nsIPrivateBrowsingChannel, nsIResumableChannel,
                            nsIStreamListener, nsIExternalHelperAppParent)

ExternalHelperAppParent::ExternalHelperAppParent(
    nsIURI* uri, const int64_t& aContentLength,
    const nsACString& aContentDispositionHeader,
    const uint32_t& aContentDispositionHint,
    const nsAString& aContentDispositionFilename)
    : mURI(uri),
      mPending(false),
      mIPCClosed(false),
      mLoadFlags(0),
      mStatus(NS_OK),
      mCanceled(false),
      mContentLength(aContentLength),
      // Never trust a child-supplied flag for the native helper-launch
      // decision: derive it from the actual URI the parent will operate on.
      mWasFileChannel(uri && uri->SchemeIs("file")) {
  mContentDispositionHeader = aContentDispositionHeader;
  if (!mContentDispositionHeader.IsEmpty()) {
    NS_GetFilenameFromDisposition(mContentDispositionFilename,
                                  mContentDispositionHeader);
    mContentDisposition =
        NS_GetContentDispositionFromHeader(mContentDispositionHeader, this);
  } else {
    mContentDisposition = aContentDispositionHint;
    mContentDispositionFilename = aContentDispositionFilename;
  }
}

bool ExternalHelperAppParent::Init(
    const mozilla::net::LoadInfoArgs& aLoadInfoArgs,
    const nsACString& aMimeContentType, const bool& aForceSave,
    nsIURI* aReferrer, BrowsingContext* aContext) {
  nsresult rv = mozilla::ipc::LoadInfoArgsToLoadInfo(
      aLoadInfoArgs, ContentParent::Cast(Manager())->GetRemoteType(),
      getter_AddRefs(mLoadInfo));
  if (NS_FAILED(rv)) {
    return false;
  }

  nsCOMPtr<nsIExternalHelperAppService> helperAppService =
      do_GetService(NS_EXTERNALHELPERAPPSERVICE_CONTRACTID);
  NS_ASSERTION(helperAppService, "No Helper App Service!");

  if (aReferrer) {
    SetPropertyAsInterface(u"docshell.internalReferrer"_ns, aReferrer);
  }

  if (aContext) {
    WindowGlobalParent* parent =
        aContext->Canonical()->GetCurrentWindowGlobal();
    if (parent) {
      RefPtr<BrowserParent> browser = parent->GetBrowserParent();
      if (browser) {
        bool isPrivate = false;
        nsCOMPtr<nsILoadContext> loadContext = browser->GetLoadContext();
        loadContext->GetUsePrivateBrowsing(&isPrivate);
        SetPrivate(isPrivate);
      }
    }
  }

  helperAppService->CreateListener(aMimeContentType, this, aContext, aForceSave,
                                   nullptr, getter_AddRefs(mListener));
  return mListener != nullptr;
}

void ExternalHelperAppParent::ActorDestroy(ActorDestroyReason why) {
  mIPCClosed = true;
}

void ExternalHelperAppParent::Delete() {
  if (!mIPCClosed) {
    (void)Send__delete__(this);
  }
}

mozilla::ipc::IPCResult ExternalHelperAppParent::RecvOnStartRequest(
    const nsACString& entityID) {
  mEntityID = entityID;
  mPending = true;
  RefPtr<nsIStreamListener> listener = mListener;
  mStatus = listener->OnStartRequest(this);
  return IPC_OK();
}

mozilla::ipc::IPCResult ExternalHelperAppParent::RecvOnDataAvailable(
    const nsACString& data, const uint64_t& offset) {
  if (NS_FAILED(mStatus)) {
    return IPC_OK();
  }

  MOZ_ASSERT(mPending, "must be pending!");

  nsCOMPtr<nsIInputStream> stringStream;
  DebugOnly<nsresult> rv = NS_NewByteInputStream(
      getter_AddRefs(stringStream), Span(data), NS_ASSIGNMENT_DEPEND);
  NS_ASSERTION(NS_SUCCEEDED(rv), "failed to create dependent string!");
  RefPtr<nsIStreamListener> listener = mListener;
  mStatus =
      listener->OnDataAvailable(this, stringStream, offset, data.Length());

  return IPC_OK();
}

mozilla::ipc::IPCResult ExternalHelperAppParent::RecvOnStopRequest(
    const nsresult& code) {
  mPending = false;
  RefPtr<nsIStreamListener> listener = mListener;
  listener->OnStopRequest(
      this, (NS_SUCCEEDED(code) && NS_FAILED(mStatus)) ? mStatus : code);
  Delete();
  return IPC_OK();
}

//
// nsIStreamListener
//

NS_IMETHODIMP
ExternalHelperAppParent::OnDataAvailable(nsIRequest* request,
                                         nsIInputStream* input, uint64_t offset,
                                         uint32_t count) {
  RefPtr<nsIStreamListener> listener = mListener;
  return listener->OnDataAvailable(request, input, offset, count);
}

NS_IMETHODIMP
ExternalHelperAppParent::OnStartRequest(nsIRequest* request) {
  RefPtr<nsIStreamListener> listener = mListener;
  return listener->OnStartRequest(request);
}

NS_IMETHODIMP
ExternalHelperAppParent::OnStopRequest(nsIRequest* request, nsresult status) {
  RefPtr<nsIStreamListener> listener = mListener;
  nsresult rv = listener->OnStopRequest(request, status);
  Delete();
  return rv;
}

ExternalHelperAppParent::~ExternalHelperAppParent() = default;

//
// nsIRequest implementation...
//

NS_IMETHODIMP
ExternalHelperAppParent::GetName(nsACString& aResult) {
  if (!mURI) {
    aResult.Truncate();
    return NS_ERROR_NOT_AVAILABLE;
  }
  mURI->GetAsciiSpec(aResult);
  return NS_OK;
}

NS_IMETHODIMP
ExternalHelperAppParent::IsPending(bool* aResult) {
  *aResult = mPending;
  return NS_OK;
}

NS_IMETHODIMP
ExternalHelperAppParent::GetStatus(nsresult* aResult) {
  *aResult = mStatus;
  return NS_OK;
}

NS_IMETHODIMP ExternalHelperAppParent::SetCanceledReason(
    const nsACString& aReason) {
  return SetCanceledReasonImpl(aReason);
}

NS_IMETHODIMP ExternalHelperAppParent::GetCanceledReason(nsACString& aReason) {
  return GetCanceledReasonImpl(aReason);
}

NS_IMETHODIMP ExternalHelperAppParent::CancelWithReason(
    nsresult aStatus, const nsACString& aReason) {
  return CancelWithReasonImpl(aStatus, aReason);
}

NS_IMETHODIMP
ExternalHelperAppParent::Cancel(nsresult aStatus) {
  mCanceled = true;
  mStatus = aStatus;
  (void)SendCancel(aStatus);
  return NS_OK;
}

NS_IMETHODIMP
ExternalHelperAppParent::GetCanceled(bool* aCanceled) {
  *aCanceled = mCanceled;
  return NS_OK;
}

NS_IMETHODIMP
ExternalHelperAppParent::Suspend() { return NS_ERROR_NOT_IMPLEMENTED; }

NS_IMETHODIMP
ExternalHelperAppParent::Resume() { return NS_ERROR_NOT_IMPLEMENTED; }

//
// nsIChannel implementation
//

NS_IMETHODIMP
ExternalHelperAppParent::GetOriginalURI(nsIURI** aURI) {
  NS_IF_ADDREF(*aURI = mURI);
  return NS_OK;
}

NS_IMETHODIMP
ExternalHelperAppParent::SetOriginalURI(nsIURI* aURI) {
  return NS_ERROR_NOT_IMPLEMENTED;
}

NS_IMETHODIMP
ExternalHelperAppParent::GetURI(nsIURI** aURI) {
  NS_IF_ADDREF(*aURI = mURI);
  return NS_OK;
}

NS_IMETHODIMP
ExternalHelperAppParent::Open(nsIInputStream** aResult) {
  return NS_ERROR_NOT_IMPLEMENTED;
}

NS_IMETHODIMP
ExternalHelperAppParent::AsyncOpen(nsIStreamListener* aListener) {
  return NS_ERROR_NOT_IMPLEMENTED;
}

NS_IMETHODIMP
ExternalHelperAppParent::GetLoadFlags(nsLoadFlags* aLoadFlags) {
  *aLoadFlags = mLoadFlags;
  return NS_OK;
}

NS_IMETHODIMP
ExternalHelperAppParent::SetLoadFlags(nsLoadFlags aLoadFlags) {
  mLoadFlags = aLoadFlags;
  return NS_OK;
}

NS_IMETHODIMP
ExternalHelperAppParent::GetTRRMode(nsIRequest::TRRMode* aTRRMode) {
  return GetTRRModeImpl(aTRRMode);
}

NS_IMETHODIMP
ExternalHelperAppParent::SetTRRMode(nsIRequest::TRRMode aTRRMode) {
  return SetTRRModeImpl(aTRRMode);
}

NS_IMETHODIMP
ExternalHelperAppParent::GetIsDocument(bool* aIsDocument) {
  return NS_GetIsDocumentChannel(this, aIsDocument);
}

NS_IMETHODIMP
ExternalHelperAppParent::GetLoadGroup(nsILoadGroup** aLoadGroup) {
  *aLoadGroup = nullptr;
  return NS_OK;
}

NS_IMETHODIMP
ExternalHelperAppParent::SetLoadGroup(nsILoadGroup* aLoadGroup) {
  return NS_ERROR_NOT_IMPLEMENTED;
}

NS_IMETHODIMP
ExternalHelperAppParent::GetOwner(nsISupports** aOwner) {
  *aOwner = nullptr;
  return NS_OK;
}

NS_IMETHODIMP
ExternalHelperAppParent::SetOwner(nsISupports* aOwner) {
  return NS_ERROR_NOT_IMPLEMENTED;
}

NS_IMETHODIMP
ExternalHelperAppParent::GetLoadInfo(nsILoadInfo** aLoadInfo) {
  NS_IF_ADDREF(*aLoadInfo = mLoadInfo);
  return NS_OK;
}

NS_IMETHODIMP
ExternalHelperAppParent::SetLoadInfo(nsILoadInfo* aLoadInfo) {
  return NS_ERROR_NOT_IMPLEMENTED;
}

NS_IMETHODIMP
ExternalHelperAppParent::GetParentProcessChannelHandle(
    mozilla::dom::ParentProcessChannelHandle** aValue) {
  *aValue = nullptr;
  return NS_OK;
}

NS_IMETHODIMP
ExternalHelperAppParent::SetParentProcessChannelHandle(
    mozilla::dom::ParentProcessChannelHandle* aValue) {
  return NS_ERROR_NOT_IMPLEMENTED;
}

NS_IMETHODIMP
ExternalHelperAppParent::GetNotificationCallbacks(
    nsIInterfaceRequestor** aCallbacks) {
  *aCallbacks = nullptr;
  return NS_OK;
}

NS_IMETHODIMP
ExternalHelperAppParent::SetNotificationCallbacks(
    nsIInterfaceRequestor* aCallbacks) {
  return NS_ERROR_NOT_IMPLEMENTED;
}

NS_IMETHODIMP
ExternalHelperAppParent::GetSecurityInfo(
    nsITransportSecurityInfo** aSecurityInfo) {
  *aSecurityInfo = nullptr;
  return NS_OK;
}

NS_IMETHODIMP
ExternalHelperAppParent::GetContentType(nsACString& aContentType) {
  aContentType.Truncate();
  return NS_OK;
}

NS_IMETHODIMP
ExternalHelperAppParent::SetContentType(const nsACString& aContentType) {
  return NS_ERROR_NOT_IMPLEMENTED;
}

NS_IMETHODIMP
ExternalHelperAppParent::GetContentCharset(nsACString& aContentCharset) {
  aContentCharset.Truncate();
  return NS_OK;
}

NS_IMETHODIMP
ExternalHelperAppParent::SetContentCharset(const nsACString& aContentCharset) {
  return NS_ERROR_NOT_IMPLEMENTED;
}

NS_IMETHODIMP
ExternalHelperAppParent::GetContentDisposition(uint32_t* aContentDisposition) {
  // NB: mContentDisposition may or may not be set to a non UINT32_MAX value in
  // nsExternalHelperAppService::DoContentContentProcessHelper
  if (mContentDispositionHeader.IsEmpty() && mContentDisposition == UINT32_MAX)
    return NS_ERROR_NOT_AVAILABLE;

  *aContentDisposition = mContentDisposition;
  return NS_OK;
}

NS_IMETHODIMP
ExternalHelperAppParent::SetContentDisposition(uint32_t aContentDisposition) {
  mContentDisposition = aContentDisposition;
  return NS_OK;
}

NS_IMETHODIMP
ExternalHelperAppParent::GetContentDispositionFilename(
    nsAString& aContentDispositionFilename) {
  if (mContentDispositionFilename.IsEmpty()) {
    return NS_ERROR_NOT_AVAILABLE;
  }

  aContentDispositionFilename = mContentDispositionFilename;
  return NS_OK;
}

NS_IMETHODIMP
ExternalHelperAppParent::SetContentDispositionFilename(
    const nsAString& aContentDispositionFilename) {
  mContentDispositionFilename = aContentDispositionFilename;
  return NS_OK;
}

NS_IMETHODIMP
ExternalHelperAppParent::GetContentDispositionHeader(
    nsACString& aContentDispositionHeader) {
  if (mContentDispositionHeader.IsEmpty()) {
    return NS_ERROR_NOT_AVAILABLE;
  }

  aContentDispositionHeader = mContentDispositionHeader;
  return NS_OK;
}

NS_IMETHODIMP
ExternalHelperAppParent::GetContentLength(int64_t* aContentLength) {
  if (mContentLength < 0) {
    *aContentLength = -1;
  } else {
    *aContentLength = mContentLength;
  }
  return NS_OK;
}

NS_IMETHODIMP
ExternalHelperAppParent::SetContentLength(int64_t aContentLength) {
  mContentLength = aContentLength;
  return NS_OK;
}

//
// nsIResumableChannel implementation
//

NS_IMETHODIMP
ExternalHelperAppParent::ResumeAt(uint64_t startPos,
                                  const nsACString& entityID) {
  return NS_ERROR_NOT_IMPLEMENTED;
}

NS_IMETHODIMP
ExternalHelperAppParent::GetEntityID(nsACString& aEntityID) {
  aEntityID = mEntityID;
  return NS_OK;
}

//
// nsIMultiPartChannel implementation
//

NS_IMETHODIMP
ExternalHelperAppParent::GetBaseChannel(nsIChannel** aChannel) {
  return NS_ERROR_NOT_IMPLEMENTED;
}

NS_IMETHODIMP
ExternalHelperAppParent::GetPartID(uint32_t* aPartID) {
  return NS_ERROR_NOT_IMPLEMENTED;
}

NS_IMETHODIMP
ExternalHelperAppParent::GetIsFirstPart(bool* aIsLastPart) {
  return NS_ERROR_NOT_IMPLEMENTED;
}

NS_IMETHODIMP
ExternalHelperAppParent::GetIsLastPart(bool* aIsLastPart) {
  return NS_ERROR_NOT_IMPLEMENTED;
}

}  // namespace dom
}  // namespace mozilla