78 lines
2.1 KiB
C++
78 lines
2.1 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/dom/FileSystemUtils.h"
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#include "nsCharSeparatedTokenizer.h"
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#include "nsString.h"
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#include "nsTArray.h"
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namespace mozilla {
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namespace dom {
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namespace {
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bool
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TokenizerIgnoreNothing(char16_t /* aChar */)
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{
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return false;
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}
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} // anonymous namespace
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/* static */ bool
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FileSystemUtils::IsDescendantPath(const nsAString& aPath,
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const nsAString& aDescendantPath)
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{
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// Check the sub-directory path to see if it has the parent path as prefix.
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if (!aDescendantPath.Equals(aPath) &&
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!StringBeginsWith(aDescendantPath, aPath)) {
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return false;
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}
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return true;
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}
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/* static */ bool
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FileSystemUtils::IsValidRelativeDOMPath(const nsAString& aPath,
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nsTArray<nsString>& aParts)
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{
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// We don't allow empty relative path to access the root.
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if (aPath.IsEmpty()) {
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return false;
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}
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// Leading and trailing "/" are not allowed.
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if (aPath.First() == FILESYSTEM_DOM_PATH_SEPARATOR_CHAR ||
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aPath.Last() == FILESYSTEM_DOM_PATH_SEPARATOR_CHAR) {
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return false;
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}
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NS_NAMED_LITERAL_STRING(kCurrentDir, ".");
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NS_NAMED_LITERAL_STRING(kParentDir, "..");
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// Split path and check each path component.
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nsCharSeparatedTokenizerTemplate<TokenizerIgnoreNothing>
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tokenizer(aPath, FILESYSTEM_DOM_PATH_SEPARATOR_CHAR);
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while (tokenizer.hasMoreTokens()) {
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nsDependentSubstring pathComponent = tokenizer.nextToken();
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// The path containing empty components, such as "foo//bar", is invalid.
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// We don't allow paths, such as "../foo", "foo/./bar" and "foo/../bar",
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// to walk up the directory.
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if (pathComponent.IsEmpty() ||
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pathComponent.Equals(kCurrentDir) ||
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pathComponent.Equals(kParentDir)) {
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return false;
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}
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aParts.AppendElement(pathComponent);
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}
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return true;
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}
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} // namespace dom
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} // namespace mozilla
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