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LibWeb: Check that import map elements are ordered maps (json objects)

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Daniel Price 2025-11-06 09:47:37 -08:00 • committed by Gregory Bertilson
parent c01f0e537e
commit b0c48b961e
Notes: github-actions[bot] 2025-11-27 20:16:35 +00:00
1 changed files with 12 additions and 4 deletions
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16
Libraries/LibWeb/HTML/Scripting/ImportMap.cpp
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@ -17,6 +17,14 @@
namespace Web::HTML {
// Check that the JS value was produced from a JSON object ({}).
// https://infra.spec.whatwg.org/#ordered-map
static bool
value_is_ordered_map(JS::Value const& value)
{
return value.is_object() && !is<JS::Array>(value.as_object());
}
// https://html.spec.whatwg.org/multipage/webappapis.html#parse-an-import-map-string
WebIDL::ExceptionOr<ImportMap> parse_import_map_string(JS::Realm& realm, ByteString const& input, URL::URL base_url)
{
@ -26,7 +34,7 @@ WebIDL::ExceptionOr<ImportMap> parse_import_map_string(JS::Realm& realm, ByteStr
auto parsed = TRY(Infra::parse_json_string_to_javascript_value(realm, input));
// 2. If parsed is not an ordered map, then throw a TypeError indicating that the top-level value needs to be a JSON object.
if (!parsed.is_object())
if (!value_is_ordered_map(parsed))
return WebIDL::SimpleException { WebIDL::SimpleExceptionType::TypeError, "The top-level value of an importmap needs to be a JSON object."_string };
auto& parsed_object = parsed.as_object();
@ -38,7 +46,7 @@ WebIDL::ExceptionOr<ImportMap> parse_import_map_string(JS::Realm& realm, ByteStr
auto imports = TRY(parsed_object.get("imports"_utf16_fly_string));
// If parsed["imports"] is not an ordered map, then throw a TypeError indicating that the value for the "imports" top-level key needs to be a JSON object.
if (!imports.is_object())
if (!value_is_ordered_map(imports))
return WebIDL::SimpleException { WebIDL::SimpleExceptionType::TypeError, "The 'imports' top-level value of an importmap needs to be a JSON object."_string };
// Set sortedAndNormalizedImports to the result of sorting and normalizing a module specifier map given parsed["imports"] and baseURL.
@ -53,7 +61,7 @@ WebIDL::ExceptionOr<ImportMap> parse_import_map_string(JS::Realm& realm, ByteStr
auto scopes = TRY(parsed_object.get("scopes"_utf16_fly_string));
// If parsed["scopes"] is not an ordered map, then throw a TypeError indicating that the value for the "scopes" top-level key needs to be a JSON object.
if (!scopes.is_object())
if (!value_is_ordered_map(scopes))
return WebIDL::SimpleException { WebIDL::SimpleExceptionType::TypeError, "The 'scopes' top-level value of an importmap needs to be a JSON object."_string };
// Set sortedAndNormalizedScopes to the result of sorting and normalizing scopes given parsed["scopes"] and baseURL.
@ -68,7 +76,7 @@ WebIDL::ExceptionOr<ImportMap> parse_import_map_string(JS::Realm& realm, ByteStr
auto integrity = TRY(parsed_object.get("integrity"_utf16_fly_string));
// 1. If parsed["integrity"] is not an ordered map, then throw a TypeError indicating that the value for the "integrity" top-level key needs to be a JSON object.
if (!integrity.is_object())
if (!value_is_ordered_map(integrity))
return WebIDL::SimpleException { WebIDL::SimpleExceptionType::TypeError, "The 'integrity' top-level value of an importmap needs to be a JSON object."_string };
// 2. Set normalizedIntegrity to the result of normalizing a module integrity map given parsed["integrity"] and baseURL.