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LibWeb/MimeSniff: Add rules for identifying an unknown mime type

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This also implements the pattern matching algorithm since it's
needed.
This commit is contained in:
Kemal Zebari 2023-11-28 13:46:20 -08:00 • committed by Andrew Kaster
parent 04e19df06a
commit 2babc08c17
2 changed files with 290 additions and 4 deletions
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59
Tests/LibWeb/TestMimeSniff.cpp
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@ -30,3 +30,62 @@ TEST_CASE(determine_computed_mime_type_given_no_sniff_is_unset)
EXPECT_EQ(xml_mime_type, MUST(computed_mime_type.serialized()));
}
TEST_CASE(compute_unknown_mime_type)
{
HashMap<StringView, Vector<StringView>> mime_type_to_headers_map;
mime_type_to_headers_map.set("application/octet-stream"sv, { "\x00"sv });
mime_type_to_headers_map.set("text/html"sv, {
"\x09\x09<!DOCTYPE HTML\x20"sv,
"\x0A<HTML\x3E"sv,
"\x0C<HEAD\x20"sv,
"\x0D<SCRIPT>"sv,
"\x20<IFRAME>"sv,
"<H1>"sv,
"<DIV>"sv,
"<FONT>"sv,
"<TABLE>"sv,
"<A>"sv,
"<STYLE>"sv,
"<TITLE>"sv,
"<B>"sv,
"<BODY>"sv,
"<BR>"sv,
"<P>"sv,
"<!-->"sv,
});
mime_type_to_headers_map.set("text/xml"sv, { "<?xml"sv });
mime_type_to_headers_map.set("application/pdf"sv, { "%PDF-"sv });
mime_type_to_headers_map.set("application/postscript"sv, { "%!PS-Adobe-"sv });
mime_type_to_headers_map.set("text/plain"sv, {
"\xFE\xFF\x00\x00"sv,
"\xFF\xFE\x00\x00"sv,
"\xEF\xBB\xBF\x00"sv,
"Hello world!"sv,
});
for (auto const& mime_type_to_headers : mime_type_to_headers_map) {
auto mime_type = mime_type_to_headers.key;
for (auto const& header : mime_type_to_headers.value) {
auto computed_mime_type = MUST(Web::MimeSniff::Resource::sniff(header.bytes()));
EXPECT_EQ(mime_type, computed_mime_type.essence());
}
}
}
TEST_CASE(compute_mime_type_given_unknown_supplied_type)
{
Array<Web::MimeSniff::MimeType, 3> unknown_supplied_types = {
MUST(Web::MimeSniff::MimeType::create("unknown"_string, "unknown"_string)),
MUST(Web::MimeSniff::MimeType::create("application"_string, "unknown"_string)),
MUST(Web::MimeSniff::MimeType::create("*"_string, "*"_string))
};
auto header_bytes = "<HTML>"sv.bytes();
for (auto const& unknown_supplied_type : unknown_supplied_types) {
auto computed_mime_type = MUST(Web::MimeSniff::Resource::sniff(header_bytes, Web::MimeSniff::SniffingConfiguration { .supplied_type = unknown_supplied_type }));
EXPECT_EQ("text/html"sv, computed_mime_type.essence());
}
}