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LibWeb/MimeSniff: Add sniffing in an image context

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This commit is contained in:
Kemal Zebari 2023-11-30 12:45:58 -08:00 • committed by Andrew Kaster
parent ea15501f37
commit 02ea85da2c
3 changed files with 100 additions and 7 deletions
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42
Userland/Libraries/LibWeb/MimeSniff/Resource.cpp
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@ -531,6 +531,48 @@ ErrorOr<void> Resource::context_specific_sniffing_algorithm(SniffingContext snif
return mime_type_sniffing_algorithm();
}
// NOTE: Non-standard but if the client expects us to not sniff, we shouldn't be doing any
// context-specific sniffing if we don't have to.
if (m_no_sniff && m_supplied_mime_type.has_value()) {
m_computed_mime_type = m_supplied_mime_type.value();
return {};
}
if (sniffing_context == SniffingContext::Image)
return rules_for_sniffing_images_specifically();
return {};
}
// https://mimesniff.spec.whatwg.org/#sniffing-in-an-image-context
ErrorOr<void> Resource::rules_for_sniffing_images_specifically()
{
// 1. If the supplied MIME type is an XML MIME type, the computed MIME type is the supplied MIME type.
// Abort these steps.
// NOTE: Non-standard but due to the mime type detection algorithm we need this sanity check.
if (m_supplied_mime_type.has_value() && m_supplied_mime_type->is_xml()) {
m_computed_mime_type = m_supplied_mime_type.value();
return {};
}
// 2. Let image-type-matched be the result of executing the image type pattern matching algorithm with
// the resource header as the byte sequence to be matched.
auto image_type_matched = TRY(match_an_image_type_pattern(resource_header()));
// 3. If image-type-matched is not undefined, the computed MIME type is image-type-matched.
// Abort these steps.
if (image_type_matched.has_value()) {
m_computed_mime_type = image_type_matched.release_value();
return {};
}
// 4. The computed MIME type is the supplied MIME type.
// NOTE: Non-standard but due to the mime type detection algorithm we need this sanity check.
if (m_supplied_mime_type.has_value()) {
m_computed_mime_type = m_supplied_mime_type.value();
}
// NOTE: Non-standard but if the supplied mime type is undefined, we use computed mime type's default value.
return {};
}