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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 = 0;
73 if (frame && frame->tree().parent() && frame->tree().parent()->isLocalFrame())
74 parentFrame = toLocalFrame(frame->tree().parent());
76 if (!m_encoding.isEmpty())
77 decoder->setEncoding(m_encoding.string(), m_encodingWasChosenByUser ? TextResourceDecoder::UserChosenEncoding : TextResourceDecoder::EncodingFromHTTPHeader);
79 // Set the hint encoding to the parent frame encoding only if
80 // the parent and the current frames share the security origin.
81 // We impose this condition because somebody can make a child frameg63
82 // containing a carefully crafted html/javascript in one encoding
83 // that can be mistaken for hintEncoding (or related encoding) by
84 // an auto detector. When interpreted in the latter, it could be
86 // FIXME: This might be too cautious for non-7bit-encodings and
87 // we may consider relaxing this later after testing.
88 if (frame && canReferToParentFrameEncoding(frame, parentFrame)) {
89 if (parentFrame->document()->encodingWasDetectedHeuristically())
90 decoder->setHintEncoding(parentFrame->document()->encoding());
92 if (m_encoding.isEmpty())
93 decoder->setEncoding(parentFrame->document()->inputEncoding().string(), TextResourceDecoder::EncodingFromParentFrame);
97 PassOwnPtr<TextResourceDecoder> TextResourceDecoderBuilder::buildFor(Document* document)
99 OwnPtr<TextResourceDecoder> decoder = createDecoderInstance(document);
100 setupEncoding(decoder.get(), document);
101 return decoder.release();
104 void TextResourceDecoderBuilder::clear()
106 if (!m_encodingWasChosenByUser)
107 m_encoding = nullAtom;