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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)
48 : m_mimeType(mimeType)
49 , m_encoding(encoding)
53 TextResourceDecoderBuilder::~TextResourceDecoderBuilder()
58 inline PassOwnPtr<TextResourceDecoder> TextResourceDecoderBuilder::createDecoderInstance(Document* document)
60 if (LocalFrame* frame = document->frame()) {
61 if (Settings* settings = frame->settings())
62 return TextResourceDecoder::create(m_mimeType, settings->defaultTextEncodingName(), settings->usesEncodingDetector());
65 return TextResourceDecoder::create(m_mimeType, String());
68 inline void TextResourceDecoderBuilder::setupEncoding(TextResourceDecoder* decoder, Document* document)
70 LocalFrame* frame = document->frame();
71 LocalFrame* parentFrame = 0;
72 if (frame && frame->tree().parent() && frame->tree().parent()->isLocalFrame())
73 parentFrame = toLocalFrame(frame->tree().parent());
75 if (!m_encoding.isEmpty())
76 decoder->setEncoding(m_encoding.string(), TextResourceDecoder::EncodingFromHTTPHeader);
78 // Set the hint encoding to the parent frame encoding only if
79 // the parent and the current frames share the security origin.
80 // We impose this condition because somebody can make a child frameg63
81 // containing a carefully crafted html/javascript in one encoding
82 // that can be mistaken for hintEncoding (or related encoding) by
83 // an auto detector. When interpreted in the latter, it could be
85 // FIXME: This might be too cautious for non-7bit-encodings and
86 // we may consider relaxing this later after testing.
87 if (frame && canReferToParentFrameEncoding(frame, parentFrame)) {
88 if (parentFrame->document()->encodingWasDetectedHeuristically())
89 decoder->setHintEncoding(parentFrame->document()->encoding());
91 if (m_encoding.isEmpty())
92 decoder->setEncoding(parentFrame->document()->inputEncoding().string(), TextResourceDecoder::EncodingFromParentFrame);
96 PassOwnPtr<TextResourceDecoder> TextResourceDecoderBuilder::buildFor(Document* document)
98 OwnPtr<TextResourceDecoder> decoder = createDecoderInstance(document);
99 setupEncoding(decoder.get(), document);
100 return decoder.release();
103 void TextResourceDecoderBuilder::clear()
105 m_encoding = nullAtom;