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LibWeb: Do not copy the result of HeaderList::extract_header_list_values

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There's no need to copy the Vector out of this result every time we call
it. We can move it out or access it directly.
This commit is contained in:
Timothy Flynn 2025-11-25 11:09:28 -05:00 • committed by Tim Flynn
parent 44fbf6451e
commit ed27eea091
Notes: github-actions[bot] 2025-11-26 14:16:24 +00:00
4 changed files with 45 additions and 39 deletions
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30
Libraries/LibWeb/ContentSecurityPolicy/Policy.cpp
View file

@ -102,28 +102,30 @@ GC::Ref<PolicyList> Policy::parse_a_responses_content_security_policies(GC::Heap
// 2. For each token returned by extracting header list values given Content-Security-Policy and response’s header
// list:
auto enforce_policy_tokens_or_failure = response->header_list()->extract_header_list_values("Content-Security-Policy"sv.bytes());
auto enforce_policy_tokens = enforce_policy_tokens_or_failure.has<Vector<ByteBuffer>>() ? enforce_policy_tokens_or_failure.get<Vector<ByteBuffer>>() : Vector<ByteBuffer> {};
for (auto const& enforce_policy_token : enforce_policy_tokens) {
// 1. Let policy be the result of parsing token, with a source of "header", and a disposition of "enforce".
auto policy = parse_a_serialized_csp(heap, enforce_policy_token, Policy::Source::Header, Policy::Disposition::Enforce);
// 2. If policy’s directive set is not empty, append policy to policies.
if (!policy->m_directives.is_empty()) {
policies.append(policy);
if (auto const* enforce_policy_tokens = enforce_policy_tokens_or_failure.get_pointer<Vector<ByteBuffer>>()) {
for (auto const& enforce_policy_token : *enforce_policy_tokens) {
// 1. Let policy be the result of parsing token, with a source of "header", and a disposition of "enforce".
auto policy = parse_a_serialized_csp(heap, enforce_policy_token, Policy::Source::Header, Policy::Disposition::Enforce);
// 2. If policy’s directive set is not empty, append policy to policies.
if (!policy->m_directives.is_empty())
policies.append(policy);
}
}
// 3. For each token returned by extracting header list values given Content-Security-Policy-Report-Only and
// response’s header list:
auto report_policy_tokens_or_failure = response->header_list()->extract_header_list_values("Content-Security-Policy-Report-Only"sv.bytes());
auto report_policy_tokens = report_policy_tokens_or_failure.has<Vector<ByteBuffer>>() ? report_policy_tokens_or_failure.get<Vector<ByteBuffer>>() : Vector<ByteBuffer> {};
for (auto const& report_policy_token : report_policy_tokens) {
// 1. Let policy be the result of parsing token, with a source of "header", and a disposition of "report".
auto policy = parse_a_serialized_csp(heap, report_policy_token, Policy::Source::Header, Policy::Disposition::Report);
// 2. If policy’s directive set is not empty, append policy to policies.
if (!policy->m_directives.is_empty()) {
policies.append(policy);
if (auto const* report_policy_tokens = enforce_policy_tokens_or_failure.get_pointer<Vector<ByteBuffer>>()) {
for (auto const& report_policy_token : *report_policy_tokens) {
// 1. Let policy be the result of parsing token, with a source of "header", and a disposition of "report".
auto policy = parse_a_serialized_csp(heap, report_policy_token, Policy::Source::Header, Policy::Disposition::Report);
// 2. If policy’s directive set is not empty, append policy to policies.
if (!policy->m_directives.is_empty())
policies.append(policy);
}
}

33
Libraries/LibWeb/Fetch/Fetching/Fetching.cpp
View file

@ -496,19 +496,20 @@ GC::Ptr<PendingResponse> main_fetch(JS::Realm& realm, Infrastructure::FetchParam
// 1. Let headerNames be the result of extracting header list values given
// `Access-Control-Expose-Headers` and response’s header list.
auto header_names_or_failure = response->header_list()->extract_header_list_values("Access-Control-Expose-Headers"sv.bytes());
auto header_names = header_names_or_failure.has<Vector<ByteBuffer>>() ? header_names_or_failure.get<Vector<ByteBuffer>>() : Vector<ByteBuffer> {};
// 2. If request’s credentials mode is not "include" and headerNames contains `*`, then set
// response’s CORS-exposed header-name list to all unique header names in response’s header
// list.
if (request->credentials_mode() != Infrastructure::Request::CredentialsMode::Include && header_names.contains_slow("*"sv.bytes())) {
auto unique_header_names = response->header_list()->unique_names();
response->set_cors_exposed_header_name_list(move(unique_header_names));
}
// 3. Otherwise, if headerNames is not null or failure, then set response’s CORS-exposed
// header-name list to headerNames.
else if (!header_names.is_empty()) {
response->set_cors_exposed_header_name_list(move(header_names));
if (auto* header_names = header_names_or_failure.get_pointer<Vector<ByteBuffer>>()) {
// 2. If request’s credentials mode is not "include" and headerNames contains `*`, then set
// response’s CORS-exposed header-name list to all unique header names in response’s header
// list.
if (request->credentials_mode() != Infrastructure::Request::CredentialsMode::Include && header_names->contains_slow("*"sv.bytes())) {
auto unique_header_names = response->header_list()->unique_names();
response->set_cors_exposed_header_name_list(move(unique_header_names));
}
// 3. Otherwise, if headerNames is not null or failure, then set response’s CORS-exposed
// header-name list to headerNames.
else if (!header_names->is_empty()) {
response->set_cors_exposed_header_name_list(move(*header_names));
}
}
}
@ -2531,10 +2532,14 @@ GC::Ref<PendingResponse> cors_preflight_fetch(JS::Realm& realm, Infrastructure::
}
// NOTE: We treat "methods_or_failure" being `Empty` as empty Vector here.
auto methods = methods_or_failure.has<Vector<ByteBuffer>>() ? methods_or_failure.get<Vector<ByteBuffer>>() : Vector<ByteBuffer> {};
auto methods = methods_or_failure.visit(
[](Vector<ByteBuffer>& methods) { return move(methods); },
[](auto) -> Vector<ByteBuffer> { return {}; });
// NOTE: We treat "header_names_or_failure" being `Empty` as empty Vector here.
auto header_names = header_names_or_failure.has<Vector<ByteBuffer>>() ? header_names_or_failure.get<Vector<ByteBuffer>>() : Vector<ByteBuffer> {};
auto header_names = header_names_or_failure.visit(
[](Vector<ByteBuffer>& header_names) { return move(header_names); },
[](auto) -> Vector<ByteBuffer> { return {}; });
// 4. If methods is null and request’s use-CORS-preflight flag is set, then set methods to a new list containing request’s method.
// NOTE: This ensures that a CORS-preflight fetch that happened due to request’s use-CORS-preflight flag being set is cached.

10
Libraries/LibWeb/Fetch/Infrastructure/HTTP/Responses.cpp
View file

@ -126,15 +126,13 @@ ErrorOr<Optional<URL::URL>> Response::location_url(Optional<String> const& reque
// 2. Let location be the result of extracting header list values given `Location` and response’s header list.
auto location_values_or_failure = m_header_list->extract_header_list_values("Location"sv.bytes());
if (location_values_or_failure.has<Infrastructure::HeaderList::ExtractHeaderParseFailure>() || location_values_or_failure.has<Empty>())
return Optional<URL::URL> {};
auto const* location_values = location_values_or_failure.get_pointer<Vector<ByteBuffer>>();
auto const& location_values = location_values_or_failure.get<Vector<ByteBuffer>>();
if (location_values.size() != 1)
return Optional<URL::URL> {};
if (!location_values || location_values->size() != 1)
return OptionalNone {};
// 3. If location is a header value, then set location to the result of parsing location with response’s URL.
auto location = DOMURL::parse(location_values.first(), url());
auto location = DOMURL::parse(location_values->first(), url());
if (!location.has_value())
return Error::from_string_literal("Invalid 'Location' header URL");

11
Libraries/LibWeb/ReferrerPolicy/AbstractOperations.cpp
View file

@ -23,16 +23,17 @@ ReferrerPolicy parse_a_referrer_policy_from_a_referrer_policy_header(Fetch::Infr
{
// 1. Let policy-tokens be the result of extracting header list values given `Referrer-Policy` and response’s header list.
auto policy_tokens_or_failure = response.header_list()->extract_header_list_values("Referrer-Policy"sv.bytes());
auto policy_tokens = policy_tokens_or_failure.has<Vector<ByteBuffer>>() ? policy_tokens_or_failure.get<Vector<ByteBuffer>>() : Vector<ByteBuffer> {};
// 2. Let policy be the empty string.
auto policy = ReferrerPolicy::EmptyString;
// 3. For each token in policy-tokens, if token is a referrer policy and token is not the empty string, then set policy to token.
for (auto token : policy_tokens) {
auto referrer_policy = from_string(token);
if (referrer_policy.has_value() && referrer_policy.value() != ReferrerPolicy::EmptyString)
policy = referrer_policy.release_value();
if (auto const* policy_tokens = policy_tokens_or_failure.get_pointer<Vector<ByteBuffer>>()) {
for (auto const& token : *policy_tokens) {
auto referrer_policy = from_string(token);
if (referrer_policy.has_value() && referrer_policy.value() != ReferrerPolicy::EmptyString)
policy = referrer_policy.release_value();
}
}
// 4. Return policy.