dom/filesystem/FileSystemUtils.cpp
author André Bargull <andre.bargull@gmail.com>
Fri, 17 Aug 2018 14:30:37 -0700
changeset 432230 fd8d17192696250a5396894301478f36c6c75be7
parent 351354 611184e06d808e4184db57f6030936b83fbf8709
child 448947 6f3709b3878117466168c40affa7bca0b60cf75b
permissions -rw-r--r--
Bug 1346211 - Part 7: Clobber after modifying ICU data file. r=clobber

/* -*- 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/FileSystemUtils.h"

namespace mozilla {
namespace dom {

namespace {

bool
TokenizerIgnoreNothing(char16_t /* aChar */)
{
  return false;
}

} // anonymous namespace

/* static */ bool
FileSystemUtils::IsDescendantPath(const nsAString& aPath,
                                  const nsAString& aDescendantPath)
{
  // Check the sub-directory path to see if it has the parent path as prefix.
  if (!aDescendantPath.Equals(aPath) &&
      !StringBeginsWith(aDescendantPath, aPath)) {
    return false;
  }

  return true;
}

/* static */ bool
FileSystemUtils::IsValidRelativeDOMPath(const nsAString& aPath,
                                        nsTArray<nsString>& aParts)
{
  // We don't allow empty relative path to access the root.
  if (aPath.IsEmpty()) {
    return false;
  }

  // Leading and trailing "/" are not allowed.
  if (aPath.First() == FILESYSTEM_DOM_PATH_SEPARATOR_CHAR ||
      aPath.Last() == FILESYSTEM_DOM_PATH_SEPARATOR_CHAR) {
    return false;
  }

  NS_NAMED_LITERAL_STRING(kCurrentDir, ".");
  NS_NAMED_LITERAL_STRING(kParentDir, "..");

  // Split path and check each path component.
  nsCharSeparatedTokenizerTemplate<TokenizerIgnoreNothing>
    tokenizer(aPath, FILESYSTEM_DOM_PATH_SEPARATOR_CHAR);

  while (tokenizer.hasMoreTokens()) {
    nsDependentSubstring pathComponent = tokenizer.nextToken();
    // The path containing empty components, such as "foo//bar", is invalid.
    // We don't allow paths, such as "../foo", "foo/./bar" and "foo/../bar",
    // to walk up the directory.
    if (pathComponent.IsEmpty() ||
        pathComponent.Equals(kCurrentDir) ||
        pathComponent.Equals(kParentDir)) {
      return false;
    }

    aParts.AppendElement(pathComponent);
  }

  return true;
}

/* static */ nsresult
FileSystemUtils::DispatchRunnable(nsIGlobalObject* aGlobal,
                                  already_AddRefed<nsIRunnable>&& aRunnable)
{
  nsCOMPtr<nsIRunnable> runnable = aRunnable;

  nsCOMPtr<nsIEventTarget> target;
  if (!aGlobal) {
    target = SystemGroup::EventTargetFor(TaskCategory::Other);
  } else {
    target = aGlobal->EventTargetFor(TaskCategory::Other);
  }

  MOZ_ASSERT(target);

  nsresult rv = target->Dispatch(runnable.forget(), NS_DISPATCH_NORMAL);
  if (NS_WARN_IF(NS_FAILED(rv))) {
    return rv;
  }

  return NS_OK;
}

} // namespace dom
} // namespace mozilla