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LibWeb/MimeSniff: Add sniffing in an image context
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3 changed files with 100 additions and 7 deletions
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@ -531,6 +531,48 @@ ErrorOr<void> Resource::context_specific_sniffing_algorithm(SniffingContext snif
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return mime_type_sniffing_algorithm();
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}
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// NOTE: Non-standard but if the client expects us to not sniff, we shouldn't be doing any
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// context-specific sniffing if we don't have to.
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if (m_no_sniff && m_supplied_mime_type.has_value()) {
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m_computed_mime_type = m_supplied_mime_type.value();
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return {};
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}
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if (sniffing_context == SniffingContext::Image)
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return rules_for_sniffing_images_specifically();
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return {};
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}
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// https://mimesniff.spec.whatwg.org/#sniffing-in-an-image-context
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ErrorOr<void> Resource::rules_for_sniffing_images_specifically()
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{
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// 1. If the supplied MIME type is an XML MIME type, the computed MIME type is the supplied MIME type.
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// Abort these steps.
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// NOTE: Non-standard but due to the mime type detection algorithm we need this sanity check.
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if (m_supplied_mime_type.has_value() && m_supplied_mime_type->is_xml()) {
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m_computed_mime_type = m_supplied_mime_type.value();
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return {};
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}
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// 2. Let image-type-matched be the result of executing the image type pattern matching algorithm with
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// the resource header as the byte sequence to be matched.
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auto image_type_matched = TRY(match_an_image_type_pattern(resource_header()));
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// 3. If image-type-matched is not undefined, the computed MIME type is image-type-matched.
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// Abort these steps.
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if (image_type_matched.has_value()) {
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m_computed_mime_type = image_type_matched.release_value();
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return {};
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}
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// 4. The computed MIME type is the supplied MIME type.
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// NOTE: Non-standard but due to the mime type detection algorithm we need this sanity check.
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if (m_supplied_mime_type.has_value()) {
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m_computed_mime_type = m_supplied_mime_type.value();
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}
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// NOTE: Non-standard but if the supplied mime type is undefined, we use computed mime type's default value.
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return {};
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}
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