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LibWeb: Make extract_header_list_values differentiate parsing failures

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Previously, parsing failures and the header not existing made
extract_header_list_values return an empty Optional, making it
impossible to differentiate between the two.

Required for implementing CORS-preflight, where parsing failures for
the headers makes it fail, but not having them doesn't make it fail in
all cases.
This commit is contained in:
Luke Wilde
2023-02-08 23:32:44 +00:00
committed by Linus Groh
parent bf2895365b
commit 237df9df5c
Notes: sideshowbarker 2024-07-17 17:49:11 +09:00 
Author: https://github.com/Lubrsi
Commit: https://github.com/SerenityOS/serenity/commit/237df9df5c
Pull-request: https://github.com/SerenityOS/serenity/pull/17383
Reviewed-by: https://github.com/linusg
3 changed files with 14 additions and 9 deletions
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10
Userland/Libraries/LibWeb/Fetch/Infrastructure/HTTP/Responses.cpp
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@@ -104,13 +104,17 @@ ErrorOr<Optional<AK::URL>> Response::location_url(Optional<DeprecatedString> con
return Optional<AK::URL> {};
// 2. Let location be the result of extracting header list values given `Location` and response’s header list.
auto location_values = TRY(extract_header_list_values("Location"sv.bytes(), m_header_list));
if (!location_values.has_value() || location_values->size() != 1)
auto location_values_or_failure = TRY(extract_header_list_values("Location"sv.bytes(), m_header_list));
if (location_values_or_failure.has<Infrastructure::ExtractHeaderParseFailure>() || location_values_or_failure.has<Empty>())
return Optional<AK::URL> {};
auto const& location_values = location_values_or_failure.get<Vector<ByteBuffer>>();
if (location_values.size() != 1)
return Optional<AK::URL> {};
// 3. If location is a header value, then set location to the result of parsing location with response’s URL.
auto base_url = *url();
auto location = AK::URLParser::parse(location_values->first(), &base_url);
auto location = AK::URLParser::parse(location_values.first(), &base_url);
if (!location.is_valid())
return Error::from_string_view("Invalid 'Location' header URL"sv);