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LibWeb/MimeSniff: Implement "minimize a supported MIME type"

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See:
- https://github.com/whatwg/mimesniff/commit/227a469
This commit is contained in:
Jamie Mansfield 2024-05-19 13:17:52 +01:00 committed by Andreas Kling
parent 08e4cf1f3b
commit 08a3904309
Notes: sideshowbarker 2024-07-16 22:22:13 +09:00 
Author: https://github.com/jamierocks
Commit: https://github.com/SerenityOS/serenity/commit/08a3904309
Pull-request: https://github.com/SerenityOS/serenity/pull/24379
Reviewed-by: https://github.com/shannonbooth
3 changed files with 62 additions and 0 deletions
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34
Tests/LibWeb/TestMimeSniff.cpp
View file

@ -1,5 +1,6 @@
/*
* Copyright (c) 2023-2024, Kemal Zebari <kemalzebra@gmail.com>.
* Copyright (c) 2024, Jamie Mansfield <jmansfield@cadixdev.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@ -330,3 +331,36 @@ TEST_CASE(determine_computed_mime_type_given_text_or_binary_context)
}));
EXPECT_EQ("application/octet-stream"sv, MUST(computed_mime_type.serialized()));
}
TEST_CASE(determine_minimised_mime_type)
{
HashMap<StringView, StringView> mime_type_to_minimised_mime_type_map;
// JavaScript MIME types should always be "text/javascript".
mime_type_to_minimised_mime_type_map.set("text/javascript"sv, "text/javascript"sv);
mime_type_to_minimised_mime_type_map.set("application/javascript"sv, "text/javascript"sv);
mime_type_to_minimised_mime_type_map.set("text/javascript; charset=utf-8"sv, "text/javascript"sv);
// JSON MIME types should always be "application/json".
mime_type_to_minimised_mime_type_map.set("application/json"sv, "application/json"sv);
mime_type_to_minimised_mime_type_map.set("text/json"sv, "application/json"sv);
mime_type_to_minimised_mime_type_map.set("application/json; charset=utf-8"sv, "application/json"sv);
// SVG MIME types should always be "image/svg+xml".
mime_type_to_minimised_mime_type_map.set("image/svg+xml"sv, "image/svg+xml"sv);
mime_type_to_minimised_mime_type_map.set("image/svg+xml; charset=utf-8"sv, "image/svg+xml"sv);
// XML MIME types should always be "application/xml".
mime_type_to_minimised_mime_type_map.set("application/xml"sv, "application/xml"sv);
mime_type_to_minimised_mime_type_map.set("text/xml"sv, "application/xml"sv);
mime_type_to_minimised_mime_type_map.set("application/xml; charset=utf-8"sv, "application/xml"sv);
// MIME types not supported by the user-agent should return an empty string.
mime_type_to_minimised_mime_type_map.set("application/java-archive"sv, ""sv);
mime_type_to_minimised_mime_type_map.set("application/zip"sv, ""sv);
for (auto const& mime_type_to_minimised_mime_type : mime_type_to_minimised_mime_type_map) {
auto mime_type = MUST(Web::MimeSniff::MimeType::parse(mime_type_to_minimised_mime_type.key)).release_value();
EXPECT_EQ(mime_type_to_minimised_mime_type.value, Web::MimeSniff::minimise_a_supported_mime_type(mime_type));
}
}

26
Userland/Libraries/LibWeb/MimeSniff/MimeType.cpp
View file

@ -2,6 +2,7 @@
* Copyright (c) 2022, Luke Wilde <lukew@serenityos.org>
* Copyright (c) 2022-2023, Linus Groh <linusg@serenityos.org>
* Copyright (c) 2022, networkException <networkexception@serenityos.org>
* Copyright (c) 2024, Jamie Mansfield <jmansfield@cadixdev.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@ -369,4 +370,29 @@ bool MimeType::is_json() const
return subtype().ends_with_bytes("+json"sv) || essence().is_one_of("application/json"sv, "text/json"sv);
}
// https://mimesniff.spec.whatwg.org/#minimize-a-supported-mime-type
String minimise_a_supported_mime_type(MimeType const& mime_type)
{
// 1. If mimeType is a JavaScript MIME type, then return "text/javascript".
if (mime_type.is_javascript())
return "text/javascript"_string;
// 2. If mimeType is a JSON MIME type, then return "application/json".
if (mime_type.is_json())
return "application/json"_string;
// 3. If mimeType’s essence is "image/svg+xml", then return "image/svg+xml".
if (mime_type.essence() == "image/svg+xml")
return "image/svg+xml"_string;
// 4. If mimeType is an XML MIME type, then return "application/xml".
if (mime_type.is_xml())
return "application/xml"_string;
// FIXME: 5. If mimeType is supported by the user agent, then return mimeType’s essence.
// 6. Return the empty string.
return {};
}
}

2
Userland/Libraries/LibWeb/MimeSniff/MimeType.h
View file

@ -67,4 +67,6 @@ private:
String m_cached_essence;
};
String minimise_a_supported_mime_type(MimeType const&);
}