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32 #include "core/loader/TextResourceDecoderBuilder.h"
34 #include "core/dom/Document.h"
35 #include "core/frame/LocalFrame.h"
36 #include "core/frame/Settings.h"
37 #include "platform/weborigin/SecurityOrigin.h"
41 static inline bool canReferToParentFrameEncoding(const LocalFrame* frame, const LocalFrame* parentFrame)
43 return parentFrame && parentFrame->document()->securityOrigin()->canAccess(frame->document()->securityOrigin());
47 TextResourceDecoderBuilder::TextResourceDecoderBuilder(const AtomicString& mimeType, const AtomicString& encoding, bool encodingUserChoosen)
48 : m_mimeType(mimeType)
49 , m_encoding(encoding)
50 , m_encodingWasChosenByUser(encodingUserChoosen)
54 TextResourceDecoderBuilder::~TextResourceDecoderBuilder()
59 inline PassOwnPtr<TextResourceDecoder> TextResourceDecoderBuilder::createDecoderInstance(Document* document)
61 if (LocalFrame* frame = document->frame()) {
62 if (Settings* settings = frame->settings())
63 return TextResourceDecoder::create(m_mimeType, settings->defaultTextEncodingName(), settings->usesEncodingDetector());
66 return TextResourceDecoder::create(m_mimeType, String());
69 inline void TextResourceDecoderBuilder::setupEncoding(TextResourceDecoder* decoder, Document* document)
71 LocalFrame* frame = document->frame();
72 LocalFrame* parentFrame = frame ? frame->tree().parent() : 0;
74 if (!m_encoding.isEmpty())
75 decoder->setEncoding(m_encoding.string(), m_encodingWasChosenByUser ? TextResourceDecoder::UserChosenEncoding : TextResourceDecoder::EncodingFromHTTPHeader);
77 // Set the hint encoding to the parent frame encoding only if
78 // the parent and the current frames share the security origin.
79 // We impose this condition because somebody can make a child frameg63
80 // containing a carefully crafted html/javascript in one encoding
81 // that can be mistaken for hintEncoding (or related encoding) by
82 // an auto detector. When interpreted in the latter, it could be
84 // FIXME: This might be too cautious for non-7bit-encodings and
85 // we may consider relaxing this later after testing.
86 if (frame && canReferToParentFrameEncoding(frame, parentFrame)) {
87 if (parentFrame->document()->encodingWasDetectedHeuristically())
88 decoder->setHintEncoding(parentFrame->document()->encoding());
90 if (m_encoding.isEmpty())
91 decoder->setEncoding(parentFrame->document()->inputEncoding().string(), TextResourceDecoder::EncodingFromParentFrame);
95 PassOwnPtr<TextResourceDecoder> TextResourceDecoderBuilder::buildFor(Document* document)
97 OwnPtr<TextResourceDecoder> decoder = createDecoderInstance(document);
98 setupEncoding(decoder.get(), document);
99 return decoder.release();
102 void TextResourceDecoderBuilder::clear()
104 if (!m_encodingWasChosenByUser)
105 m_encoding = nullAtom;