FileSystemPermissionRequest.cpp

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* 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 "FileSystemPermissionRequest.h"

#include "mozilla/dom/FileSystemBase.h"
#include "mozilla/dom/FileSystemTaskBase.h"
#include "mozilla/dom/FileSystemUtils.h"
#include "mozilla/dom/TabChild.h"
#include "nsIDocument.h"
#include "nsPIDOMWindow.h"
#include "nsString.h"

namespace mozilla {
namespace dom {

NS_IMPL_ISUPPORTS(FileSystemPermissionRequest, nsIRunnable, nsIContentPermissionRequest)

// static
void
FileSystemPermissionRequest::RequestForTask(FileSystemTaskBase* aTask)
{
  MOZ_ASSERT(aTask, "aTask should not be null!");
  MOZ_ASSERT(NS_IsMainThread());
  nsRefPtr<FileSystemPermissionRequest> request =
    new FileSystemPermissionRequest(aTask);
  NS_DispatchToCurrentThread(request);
}

FileSystemPermissionRequest::FileSystemPermissionRequest(
  FileSystemTaskBase* aTask)
  : mTask(aTask)
{
  MOZ_ASSERT(mTask, "aTask should not be null!");
  MOZ_ASSERT(NS_IsMainThread());

  mTask->GetPermissionAccessType(mPermissionAccess);

  nsRefPtr<FileSystemBase> filesystem = mTask->GetFileSystem();
  if (!filesystem) {
    return;
  }

  mPermissionType = filesystem->GetPermission();

  mWindow = filesystem->GetWindow();
  if (!mWindow) {
    return;
  }

  nsCOMPtr<nsIDocument> doc = mWindow->GetDoc();
  if (!doc) {
    return;
  }

  mPrincipal = doc->NodePrincipal();
}

FileSystemPermissionRequest::~FileSystemPermissionRequest()
{
}

bool
FileSystemPermissionRequest::Recv__delete__(const bool& aAllow,
               const InfallibleTArray<PermissionChoice>& aChoices)
{
  MOZ_ASSERT(aChoices.IsEmpty(),
             "FileSystemPermissionRequest doesn't support permission choice");
  if (aAllow) {
    Allow(JS::UndefinedHandleValue);
  } else {
    Cancel();
  }
  return true;
}

void
FileSystemPermissionRequest::IPDLRelease()
{
  Release();
}

NS_IMETHODIMP
FileSystemPermissionRequest::GetTypes(nsIArray** aTypes)
{
  nsTArray<nsString> emptyOptions;
  return CreatePermissionArray(mPermissionType,
                               mPermissionAccess,
                               emptyOptions,
                               aTypes);
}

NS_IMETHODIMP
FileSystemPermissionRequest::GetPrincipal(nsIPrincipal** aRequestingPrincipal)
{
  NS_IF_ADDREF(*aRequestingPrincipal = mPrincipal);
  return NS_OK;
}

NS_IMETHODIMP
FileSystemPermissionRequest::GetWindow(nsIDOMWindow** aRequestingWindow)
{
  NS_IF_ADDREF(*aRequestingWindow = mWindow);
  return NS_OK;
}

NS_IMETHODIMP
FileSystemPermissionRequest::GetElement(nsIDOMElement** aRequestingElement)
{
  *aRequestingElement = nullptr;
  return NS_OK;
}

NS_IMETHODIMP
FileSystemPermissionRequest::Cancel()
{
  MOZ_ASSERT(NS_IsMainThread());
  mTask->SetError(NS_ERROR_DOM_SECURITY_ERR);
  mTask->Start();
  return NS_OK;
}

NS_IMETHODIMP
FileSystemPermissionRequest::Allow(JS::HandleValue aChoices)
{
  MOZ_ASSERT(NS_IsMainThread());
  MOZ_ASSERT(aChoices.isUndefined());
  mTask->Start();
  return NS_OK;
}

NS_IMETHODIMP
FileSystemPermissionRequest::Run()
{
  MOZ_ASSERT(NS_IsMainThread());

  nsRefPtr<FileSystemBase> filesystem = mTask->GetFileSystem();
  if (!filesystem) {
    Cancel();
    return NS_OK;
  }

  if (filesystem->IsTesting()) {
    Allow(JS::UndefinedHandleValue);
    return NS_OK;
  }

  if (FileSystemUtils::IsParentProcess()) {
    nsCOMPtr<nsIContentPermissionPrompt> prompt
      = do_CreateInstance(NS_CONTENT_PERMISSION_PROMPT_CONTRACTID);
    if (!prompt || NS_FAILED(prompt->Prompt(this))) {
      Cancel();
    }
    return NS_OK;
  }

  if (!mWindow) {
    Cancel();
    return NS_OK;
  }

  // because owner implements nsITabChild, we can assume that it is
  // the one and only TabChild.
  TabChild* child = TabChild::GetFrom(mWindow->GetDocShell());
  if (!child) {
    Cancel();
    return NS_OK;
  }

  // Retain a reference so the object isn't deleted without IPDL's
  // knowledge. Corresponding release occurs in
  // DeallocPContentPermissionRequest.
  AddRef();

  nsTArray<PermissionRequest> permArray;
  nsTArray<nsString> emptyOptions;
  permArray.AppendElement(PermissionRequest(mPermissionType,
                                            mPermissionAccess,
                                            emptyOptions));
  child->SendPContentPermissionRequestConstructor(
    this, permArray, IPC::Principal(mPrincipal));

  Sendprompt();
  return NS_OK;
}

} /* namespace dom */
} /* namespace mozilla */