tor-browser

The Tor Browser
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FileSystemUtils.cpp (2552B)

      1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
      2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
      3 /* This Source Code Form is subject to the terms of the Mozilla Public
      4 * License, v. 2.0. If a copy of the MPL was not distributed with this file,
      5 * You can obtain one at http://mozilla.org/MPL/2.0/. */
      6 
      7 #include "mozilla/dom/FileSystemUtils.h"
      8 
      9 #include "nsCharSeparatedTokenizer.h"
     10 #include "nsIEventTarget.h"
     11 #include "nsThreadUtils.h"
     12 
     13 namespace mozilla::dom {
     14 
     15 /* static */
     16 bool FileSystemUtils::IsDescendantPath(const nsAString& aPath,
     17                                       const nsAString& aDescendantPath) {
     18  // Check the sub-directory path to see if it has the parent path as prefix.
     19  if (!aDescendantPath.Equals(aPath) &&
     20      !StringBeginsWith(aDescendantPath, aPath)) {
     21    return false;
     22  }
     23 
     24  return true;
     25 }
     26 
     27 /* static */
     28 bool FileSystemUtils::IsValidRelativeDOMPath(const nsAString& aPath,
     29                                             nsTArray<nsString>& aParts) {
     30  // We don't allow empty relative path to access the root.
     31  if (aPath.IsEmpty()) {
     32    return false;
     33  }
     34 
     35  // Leading and trailing "/" are not allowed.
     36  if (aPath.First() == FILESYSTEM_DOM_PATH_SEPARATOR_CHAR ||
     37      aPath.Last() == FILESYSTEM_DOM_PATH_SEPARATOR_CHAR) {
     38    return false;
     39  }
     40 
     41  constexpr auto kCurrentDir = u"."_ns;
     42  constexpr auto kParentDir = u".."_ns;
     43 
     44  // Split path and check each path component.
     45  for (const nsAString& pathComponent :
     46       nsCharSeparatedTokenizerTemplate<NS_TokenizerIgnoreNothing>{
     47           aPath, FILESYSTEM_DOM_PATH_SEPARATOR_CHAR}
     48           .ToRange()) {
     49    // The path containing empty components, such as "foo//bar", is invalid.
     50    // We don't allow paths, such as "../foo", "foo/./bar" and "foo/../bar",
     51    // to walk up the directory.
     52    if (pathComponent.IsEmpty() || pathComponent.Equals(kCurrentDir) ||
     53        pathComponent.Equals(kParentDir)) {
     54      return false;
     55    }
     56 
     57    aParts.AppendElement(pathComponent);
     58  }
     59 
     60  return true;
     61 }
     62 
     63 /* static */
     64 nsresult FileSystemUtils::DispatchRunnable(
     65    nsIGlobalObject* aGlobal, already_AddRefed<nsIRunnable>&& aRunnable) {
     66  nsCOMPtr<nsIRunnable> runnable = aRunnable;
     67 
     68  nsCOMPtr<nsIEventTarget> target;
     69  if (!aGlobal) {
     70    target = GetMainThreadSerialEventTarget();
     71  } else {
     72    target = aGlobal->SerialEventTarget();
     73  }
     74 
     75  MOZ_ASSERT(target);
     76 
     77  nsresult rv = target->Dispatch(runnable.forget(), NS_DISPATCH_NORMAL);
     78  if (NS_WARN_IF(NS_FAILED(rv))) {
     79    return rv;
     80  }
     81 
     82  return NS_OK;
     83 }
     84 
     85 }  // namespace mozilla::dom