gecko-dev/dom/filesystem/RemoveTask.cpp

/* -*- 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 "RemoveTask.h"

#include "mozilla/dom/File.h"
#include "mozilla/dom/FileSystemBase.h"
#include "mozilla/dom/FileSystemUtils.h"
#include "mozilla/dom/PFileSystemParams.h"
#include "mozilla/dom/Promise.h"
#include "mozilla/dom/ipc/BlobChild.h"
#include "mozilla/dom/ipc/BlobParent.h"
#include "nsIFile.h"
#include "nsStringGlue.h"

namespace mozilla {
namespace dom {

/**
 * RemoveTaskChild
 */

/* static */ already_AddRefed<RemoveTaskChild>
RemoveTaskChild::Create(FileSystemBase* aFileSystem,
                        nsIFile* aDirPath,
                        nsIFile* aTargetPath,
                        bool aRecursive,
                        ErrorResult& aRv)
{
  MOZ_ASSERT(NS_IsMainThread(), "Only call on main thread!");
  MOZ_ASSERT(aFileSystem);
  MOZ_ASSERT(aDirPath);
  MOZ_ASSERT(aTargetPath);

  RefPtr<RemoveTaskChild> task =
    new RemoveTaskChild(aFileSystem, aDirPath, aTargetPath, aRecursive);

  // aTargetPath can be null. In this case SetError will be called.

  nsCOMPtr<nsIGlobalObject> globalObject =
    do_QueryInterface(aFileSystem->GetParentObject());
  if (NS_WARN_IF(!globalObject)) {
    aRv.Throw(NS_ERROR_FAILURE);
    return nullptr;
  }

  task->mPromise = Promise::Create(globalObject, aRv);
  if (NS_WARN_IF(aRv.Failed())) {
    return nullptr;
  }

  return task.forget();
}

RemoveTaskChild::RemoveTaskChild(FileSystemBase* aFileSystem,
                                 nsIFile* aDirPath,
                                 nsIFile* aTargetPath,
                                 bool aRecursive)
  : FileSystemTaskChildBase(aFileSystem)
  , mDirPath(aDirPath)
  , mTargetPath(aTargetPath)
  , mRecursive(aRecursive)
  , mReturnValue(false)
{
  MOZ_ASSERT(NS_IsMainThread(), "Only call on main thread!");
  MOZ_ASSERT(aFileSystem);
  MOZ_ASSERT(aDirPath);
  MOZ_ASSERT(aTargetPath);
}

RemoveTaskChild::~RemoveTaskChild()
{
  MOZ_ASSERT(NS_IsMainThread());
}

already_AddRefed<Promise>
RemoveTaskChild::GetPromise()
{
  MOZ_ASSERT(NS_IsMainThread(), "Only call on main thread!");
  return RefPtr<Promise>(mPromise).forget();
}

FileSystemParams
RemoveTaskChild::GetRequestParams(const nsString& aSerializedDOMPath,
                                  ErrorResult& aRv) const
{
  MOZ_ASSERT(NS_IsMainThread(), "Only call on main thread!");
  FileSystemRemoveParams param;
  param.filesystem() = aSerializedDOMPath;

  aRv = mDirPath->GetPath(param.directory());
  if (NS_WARN_IF(aRv.Failed())) {
    return param;
  }

  param.recursive() = mRecursive;

  nsAutoString path;
  aRv = mTargetPath->GetPath(path);
  if (NS_WARN_IF(aRv.Failed())) {
    return param;
  }

  param.targetDirectory() = path;

  return param;
}

void
RemoveTaskChild::SetSuccessRequestResult(const FileSystemResponseValue& aValue,
                                         ErrorResult& aRv)
{
  MOZ_ASSERT(NS_IsMainThread(), "Only call on main thread!");

  FileSystemBooleanResponse r = aValue;
  mReturnValue = r.success();
}

void
RemoveTaskChild::HandlerCallback()
{
  MOZ_ASSERT(NS_IsMainThread(), "Only call on main thread!");

  if (mFileSystem->IsShutdown()) {
    mPromise = nullptr;
    return;
  }

  if (HasError()) {
    mPromise->MaybeReject(mErrorValue);
    mPromise = nullptr;
    return;
  }

  mPromise->MaybeResolve(mReturnValue);
  mPromise = nullptr;
}

void
RemoveTaskChild::GetPermissionAccessType(nsCString& aAccess) const
{
  aAccess.AssignLiteral(DIRECTORY_WRITE_PERMISSION);
}

/**
 * RemoveTaskParent
 */

/* static */ already_AddRefed<RemoveTaskParent>
RemoveTaskParent::Create(FileSystemBase* aFileSystem,
                         const FileSystemRemoveParams& aParam,
                         FileSystemRequestParent* aParent,
                         ErrorResult& aRv)
{
  MOZ_ASSERT(XRE_IsParentProcess(), "Only call from parent process!");
  AssertIsOnBackgroundThread();
  MOZ_ASSERT(aFileSystem);

  RefPtr<RemoveTaskParent> task =
    new RemoveTaskParent(aFileSystem, aParam, aParent);

  aRv = NS_NewLocalFile(aParam.directory(), true,
                        getter_AddRefs(task->mDirPath));
  if (NS_WARN_IF(aRv.Failed())) {
    return nullptr;
  }

  task->mRecursive = aParam.recursive();

  aRv = NS_NewLocalFile(aParam.targetDirectory(), true,
                        getter_AddRefs(task->mTargetPath));
  if (NS_WARN_IF(aRv.Failed())) {
    return nullptr;
  }

  if (!FileSystemUtils::IsDescendantPath(task->mDirPath, task->mTargetPath)) {
    aRv.Throw(NS_ERROR_DOM_FILESYSTEM_NO_MODIFICATION_ALLOWED_ERR);
    return nullptr;
  }

  return task.forget();
}

RemoveTaskParent::RemoveTaskParent(FileSystemBase* aFileSystem,
                                   const FileSystemRemoveParams& aParam,
                                   FileSystemRequestParent* aParent)
  : FileSystemTaskParentBase(aFileSystem, aParam, aParent)
  , mRecursive(false)
  , mReturnValue(false)
{
  MOZ_ASSERT(XRE_IsParentProcess(), "Only call from parent process!");
  AssertIsOnBackgroundThread();
  MOZ_ASSERT(aFileSystem);
}

FileSystemResponseValue
RemoveTaskParent::GetSuccessRequestResult(ErrorResult& aRv) const
{
  AssertIsOnBackgroundThread();

  return FileSystemBooleanResponse(mReturnValue);
}

nsresult
RemoveTaskParent::IOWork()
{
  MOZ_ASSERT(XRE_IsParentProcess(),
             "Only call from parent process!");
  MOZ_ASSERT(!NS_IsMainThread(), "Only call on worker thread!");

  if (mFileSystem->IsShutdown()) {
    return NS_ERROR_FAILURE;
  }

  MOZ_ASSERT(FileSystemUtils::IsDescendantPath(mDirPath, mTargetPath));

  bool exists = false;
  nsresult rv = mTargetPath->Exists(&exists);
  if (NS_WARN_IF(NS_FAILED(rv))) {
    return rv;
  }

  if (!exists) {
    mReturnValue = false;
    return NS_OK;
  }

  bool isFile = false;
  rv = mTargetPath->IsFile(&isFile);
  if (NS_WARN_IF(NS_FAILED(rv))) {
    return rv;
  }

  if (isFile && !mFileSystem->IsSafeFile(mTargetPath)) {
    return NS_ERROR_DOM_SECURITY_ERR;
  }

  rv = mTargetPath->Remove(mRecursive);
  if (NS_WARN_IF(NS_FAILED(rv))) {
    return rv;
  }

  mReturnValue = true;

  return NS_OK;
}

void
RemoveTaskParent::GetPermissionAccessType(nsCString& aAccess) const
{
  aAccess.AssignLiteral(DIRECTORY_WRITE_PERMISSION);
}

} // namespace dom
} // namespace mozilla