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/*
* Copyright (C) 2010 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "DOMFilePath.h"
#if ENABLE(FILE_SYSTEM)
#include <wtf/Vector.h>
#include <wtf/text/CString.h>
namespace WebCore {
const char DOMFilePath::separator = '/';
const char DOMFilePath::root[] = "/";
String DOMFilePath::append(const String& base, const String& components)
{
return ensureDirectoryPath(base) + components;
}
String DOMFilePath::ensureDirectoryPath(const String& path)
{
if (!DOMFilePath::endsWithSeparator(path)) {
String newPath = path;
newPath.append(DOMFilePath::separator);
return newPath;
}
return path;
}
String DOMFilePath::getName(const String& path)
{
int index = path.reverseFind(DOMFilePath::separator);
if (index != -1)
return path.substring(index + 1);
return path;
}
String DOMFilePath::getDirectory(const String& path)
{
int index = path.reverseFind(DOMFilePath::separator);
if (!index)
return DOMFilePath::root;
if (index != -1)
return path.substring(0, index);
return ".";
}
bool DOMFilePath::isParentOf(const String& parent, const String& mayBeChild)
{
ASSERT(DOMFilePath::isAbsolute(parent));
ASSERT(DOMFilePath::isAbsolute(mayBeChild));
if (parent == DOMFilePath::root && mayBeChild != DOMFilePath::root)
return true;
if (parent.length() >= mayBeChild.length() || !mayBeChild.startsWith(parent, false))
return false;
if (mayBeChild[parent.length()] != DOMFilePath::separator)
return false;
return true;
}
String DOMFilePath::removeExtraParentReferences(const String& path)
{
ASSERT(DOMFilePath::isAbsolute(path));
Vector<String> components;
Vector<String> canonicalized;
path.split(DOMFilePath::separator, components);
for (size_t i = 0; i < components.size(); ++i) {
if (components[i] == ".")
continue;
if (components[i] == "..") {
if (canonicalized.size() > 0)
canonicalized.removeLast();
continue;
}
canonicalized.append(components[i]);
}
if (canonicalized.isEmpty())
return DOMFilePath::root;
String result;
for (size_t i = 0; i < canonicalized.size(); ++i) {
result.append(DOMFilePath::separator);
result.append(canonicalized[i]);
}
return result;
}
bool DOMFilePath::isValidPath(const String& path)
{
if (path.isEmpty() || path == DOMFilePath::root)
return true;
// Embedded NULs are not allowed.
if (path.find(static_cast<UChar>(0)) != WTF::notFound)
return false;
// While not [yet] restricted by the spec, '\\' complicates implementation for Chromium.
if (path.find('\\') != WTF::notFound)
return false;
// This method is only called on fully-evaluated absolute paths. Any sign of ".." or "." is likely an attempt to break out of the sandbox.
Vector<String> components;
path.split(DOMFilePath::separator, components);
for (size_t i = 0; i < components.size(); ++i) {
if (components[i] == ".")
return false;
if (components[i] == "..")
return false;
}
return true;
}
bool DOMFilePath::isValidName(const String& name)
{
if (name.isEmpty())
return true;
// '/' is not allowed in name.
if (name.contains('/'))
return false;
return isValidPath(name);
}
} // namespace WebCore
#endif // ENABLE(FILE_SYSTEM)
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