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/*
* Copyright (C) 2013 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 "core/loader/TextResourceDecoderBuilder.h"
#include "core/dom/Document.h"
#include "core/frame/LocalFrame.h"
#include "core/frame/Settings.h"
#include "platform/weborigin/SecurityOrigin.h"
namespace blink {
static inline bool canReferToParentFrameEncoding(const LocalFrame* frame, const LocalFrame* parentFrame)
{
return parentFrame && parentFrame->document()->securityOrigin()->canAccess(frame->document()->securityOrigin());
}
TextResourceDecoderBuilder::TextResourceDecoderBuilder(const AtomicString& mimeType, const AtomicString& encoding)
: m_mimeType(mimeType)
, m_encoding(encoding)
{
}
TextResourceDecoderBuilder::~TextResourceDecoderBuilder()
{
}
inline PassOwnPtr<TextResourceDecoder> TextResourceDecoderBuilder::createDecoderInstance(Document* document)
{
if (LocalFrame* frame = document->frame()) {
if (Settings* settings = frame->settings())
return TextResourceDecoder::create(m_mimeType, settings->defaultTextEncodingName(), settings->usesEncodingDetector());
}
return TextResourceDecoder::create(m_mimeType, String());
}
inline void TextResourceDecoderBuilder::setupEncoding(TextResourceDecoder* decoder, Document* document)
{
LocalFrame* frame = document->frame();
LocalFrame* parentFrame = 0;
if (frame && frame->tree().parent() && frame->tree().parent()->isLocalFrame())
parentFrame = toLocalFrame(frame->tree().parent());
if (!m_encoding.isEmpty())
decoder->setEncoding(m_encoding.string(), TextResourceDecoder::EncodingFromHTTPHeader);
// Set the hint encoding to the parent frame encoding only if
// the parent and the current frames share the security origin.
// We impose this condition because somebody can make a child frameg63
// containing a carefully crafted html/javascript in one encoding
// that can be mistaken for hintEncoding (or related encoding) by
// an auto detector. When interpreted in the latter, it could be
// an attack vector.
// FIXME: This might be too cautious for non-7bit-encodings and
// we may consider relaxing this later after testing.
if (frame && canReferToParentFrameEncoding(frame, parentFrame)) {
if (parentFrame->document()->encodingWasDetectedHeuristically())
decoder->setHintEncoding(parentFrame->document()->encoding());
if (m_encoding.isEmpty())
decoder->setEncoding(parentFrame->document()->encoding(), TextResourceDecoder::EncodingFromParentFrame);
}
}
PassOwnPtr<TextResourceDecoder> TextResourceDecoderBuilder::buildFor(Document* document)
{
OwnPtr<TextResourceDecoder> decoder = createDecoderInstance(document);
setupEncoding(decoder.get(), document);
return decoder.release();
}
void TextResourceDecoderBuilder::clear()
{
m_encoding = nullAtom;
}
}