LibWeb: Make HeaderList ref-counted

This is needed to eventually share a header list between a Request or
Response object's internal infra request/response and the object's
exposed Header object.

Userland/Libraries/LibWeb/Fetch/Headers.cpp

@@ -28,6 +28,7 @@ WebIDL::ExceptionOr<JS::NonnullGCPtr<Headers>> Headers::create_with_global_objec
 
 Headers::Headers(HTML::Window& window)
     : PlatformObject(window.realm())
+    , m_header_list(make_ref_counted<Infrastructure::HeaderList>())
 {
     set_prototype(&window.cached_web_prototype("Headers"));
 }
@@ -73,11 +74,11 @@ WebIDL::ExceptionOr<void> Headers::delete_(String const& name_string)
         return {};
 
     // 6. If this’s header list does not contain name, then return.
-    if (!m_header_list.contains(name))
+    if (!m_header_list->contains(name))
         return {};
 
     // 7. Delete name from this’s header list.
-    m_header_list.delete_(name);
+    m_header_list->delete_(name);
 
     // 8. If this’s guard is "request-no-cors", then remove privileged no-CORS request headers from this.
     if (m_guard == Guard::RequestNoCORS)
@@ -97,7 +98,7 @@ WebIDL::ExceptionOr<String> Headers::get(String const& name_string)
         return WebIDL::SimpleException { WebIDL::SimpleExceptionType::TypeError, "Invalid header name" };
 
     // 2. Return the result of getting name from this’s header list.
-    auto byte_buffer = TRY_OR_RETURN_OOM(global_object(), m_header_list.get(name));
+    auto byte_buffer = TRY_OR_RETURN_OOM(global_object(), m_header_list->get(name));
     // FIXME: Teach BindingsGenerator about Optional<String>
     return byte_buffer.has_value() ? String { byte_buffer->span() } : String {};
 }
@@ -113,7 +114,7 @@ WebIDL::ExceptionOr<bool> Headers::has(String const& name_string)
         return WebIDL::SimpleException { WebIDL::SimpleExceptionType::TypeError, "Invalid header name" };
 
     // 2. Return true if this’s header list contains name; otherwise false.
-    return m_header_list.contains(name);
+    return m_header_list->contains(name);
 }
 
 // https://fetch.spec.whatwg.org/#dom-headers-set
@@ -154,7 +155,7 @@ WebIDL::ExceptionOr<void> Headers::set(String const& name_string, String const&
         return {};
 
     // 7. Set (name, value) in this’s header list.
-    TRY_OR_RETURN_OOM(global_object(), m_header_list.set(move(header)));
+    TRY_OR_RETURN_OOM(global_object(), m_header_list->set(move(header)));
 
     // 8. If this’s guard is "request-no-cors", then remove privileged no-CORS request headers from this.
     if (m_guard == Guard::RequestNoCORS)
@@ -168,7 +169,7 @@ JS::ThrowCompletionOr<void> Headers::for_each(ForEachCallback callback)
 {
     // The value pairs to iterate over are the return value of running sort and combine with this’s header list.
     auto value_pairs_to_iterate_over = [&]() -> JS::ThrowCompletionOr<Vector<Fetch::Infrastructure::Header>> {
-        auto headers_or_error = m_header_list.sort_and_combine();
+        auto headers_or_error = m_header_list->sort_and_combine();
         if (headers_or_error.is_error())
             return vm().throw_completion<JS::InternalError>(JS::ErrorType::NotEnoughMemoryToAllocate);
         return headers_or_error.release_value();
@@ -226,7 +227,7 @@ WebIDL::ExceptionOr<void> Headers::append(Infrastructure::Header header)
     // 5. Otherwise, if headers’s guard is "request-no-cors":
     if (m_guard == Guard::RequestNoCORS) {
         // 1. Let temporaryValue be the result of getting name from headers’s header list.
-        auto temporary_value = TRY_OR_RETURN_OOM(global_object(), m_header_list.get(name));
+        auto temporary_value = TRY_OR_RETURN_OOM(global_object(), m_header_list->get(name));
 
         // 2. If temporaryValue is null, then set temporaryValue to value.
         if (!temporary_value.has_value()) {
@@ -253,8 +254,8 @@ WebIDL::ExceptionOr<void> Headers::append(Infrastructure::Header header)
     if (m_guard == Guard::Response && Infrastructure::is_forbidden_response_header_name(name))
         return {};
 
-    // 7. Append (name, value) to headers’s header list.
-    TRY_OR_RETURN_OOM(global_object(), m_header_list.append(move(header)));
+    // 7. Append (name, value) to headers’s header list
+    TRY_OR_RETURN_OOM(global_object(), m_header_list->append(move(header)));
 
     // 8. If headers’s guard is "request-no-cors", then remove privileged no-CORS request headers from headers.
     if (m_guard == Guard::RequestNoCORS)
@@ -309,7 +310,7 @@ void Headers::remove_privileged_no_cors_headers()
     // 1. For each headerName of privileged no-CORS request-header names:
     for (auto const& header_name : privileged_no_cors_request_header_names) {
         // 1. Delete headerName from headers’s header list.
-        m_header_list.delete_(header_name.bytes());
+        m_header_list->delete_(header_name.bytes());
     }
 }
 

Userland/Libraries/LibWeb/Fetch/Headers.h

@@ -35,9 +35,9 @@ public:
 
     virtual ~Headers() override;
 
-    [[nodiscard]] Infrastructure::HeaderList& header_list() { return m_header_list; }
-    [[nodiscard]] Infrastructure::HeaderList const& header_list() const { return m_header_list; }
-    void set_header_list(Infrastructure::HeaderList header_list) { m_header_list = move(header_list); }
+    [[nodiscard]] NonnullRefPtr<Infrastructure::HeaderList>& header_list() { return m_header_list; }
+    [[nodiscard]] NonnullRefPtr<Infrastructure::HeaderList> const& header_list() const { return m_header_list; }
+    void set_header_list(NonnullRefPtr<Infrastructure::HeaderList> header_list) { m_header_list = move(header_list); }
 
     [[nodiscard]] Guard guard() const { return m_guard; }
     void set_guard(Guard guard) { m_guard = guard; }
@@ -63,7 +63,7 @@ private:
 
     // https://fetch.spec.whatwg.org/#concept-headers-header-list
     // A Headers object has an associated header list (a header list), which is initially empty.
-    Infrastructure::HeaderList m_header_list;
+    NonnullRefPtr<Infrastructure::HeaderList> m_header_list;
 
     // https://fetch.spec.whatwg.org/#concept-headers-guard
     // A Headers object also has an associated guard, which is a headers guard. A headers guard is "immutable", "request", "request-no-cors", "response" or "none".

Userland/Libraries/LibWeb/Fetch/HeadersIterator.cpp

@@ -38,7 +38,7 @@ JS::ThrowCompletionOr<JS::Object*> HeadersIterator::next()
 {
     // The value pairs to iterate over are the return value of running sort and combine with this’s header list.
     auto value_pairs_to_iterate_over = [&]() -> JS::ThrowCompletionOr<Vector<Fetch::Infrastructure::Header>> {
-        auto headers_or_error = m_headers.m_header_list.sort_and_combine();
+        auto headers_or_error = m_headers.m_header_list->sort_and_combine();
         if (headers_or_error.is_error())
             return vm().throw_completion<JS::InternalError>(JS::ErrorType::NotEnoughMemoryToAllocate);
         return headers_or_error.release_value();

Userland/Libraries/LibWeb/Fetch/Infrastructure/HTTP/Headers.h

@@ -26,7 +26,9 @@ struct Header {
 
 // https://fetch.spec.whatwg.org/#concept-header-list
 // A header list is a list of zero or more headers. It is initially the empty list.
-class HeaderList final : Vector<Header> {
+class HeaderList final
+    : public RefCounted<HeaderList>
+    , Vector<Header> {
 public:
     using Vector::begin;
     using Vector::end;

Userland/Libraries/LibWeb/Fetch/Infrastructure/HTTP/Requests.cpp

@@ -9,6 +9,11 @@
 
 namespace Web::Fetch::Infrastructure {
 
+Request::Request()
+    : m_header_list(make_ref_counted<HeaderList>())
+{
+}
+
 // https://fetch.spec.whatwg.org/#concept-request-url
 AK::URL const& Request::url() const
 {
@@ -202,7 +207,7 @@ ErrorOr<void> Request::add_range_reader(u64 first, Optional<u64> const& last)
         .name = TRY(ByteBuffer::copy("Range"sv.bytes())),
         .value = move(range_value),
     };
-    TRY(m_header_list.append(move(header)));
+    TRY(m_header_list->append(move(header)));
 
     return {};
 }

Userland/Libraries/LibWeb/Fetch/Infrastructure/HTTP/Requests.h

@@ -154,7 +154,7 @@ public:
     using ReservedClientType = Variant<Empty, HTML::Environment*, HTML::EnvironmentSettingsObject*>;
     using WindowType = Variant<Window, HTML::EnvironmentSettingsObject*>;
 
-    Request() = default;
+    Request();
 
     [[nodiscard]] ReadonlyBytes method() const { return m_method; }
     void set_method(ByteBuffer method) { m_method = move(method); }
@@ -162,9 +162,9 @@ public:
     [[nodiscard]] bool local_urls_only() const { return m_local_urls_only; }
     void set_local_urls_only(bool local_urls_only) { m_local_urls_only = local_urls_only; }
 
-    [[nodiscard]] HeaderList const& header_list() const { return m_header_list; }
-    [[nodiscard]] HeaderList& header_list() { return m_header_list; }
-    void set_header_list(HeaderList header_list) { m_header_list = move(header_list); }
+    [[nodiscard]] NonnullRefPtr<HeaderList> const& header_list() const { return m_header_list; }
+    [[nodiscard]] NonnullRefPtr<HeaderList>& header_list() { return m_header_list; }
+    void set_header_list(NonnullRefPtr<HeaderList> header_list) { m_header_list = move(header_list); }
 
     [[nodiscard]] bool unsafe_request() const { return m_unsafe_request; }
     void set_unsafe_request(bool unsafe_request) { m_unsafe_request = unsafe_request; }
@@ -304,7 +304,7 @@ private:
 
     // https://fetch.spec.whatwg.org/#concept-request-header-list
     // A request has an associated header list (a header list). Unless stated otherwise it is empty.
-    HeaderList m_header_list;
+    NonnullRefPtr<HeaderList> m_header_list;
 
     // https://fetch.spec.whatwg.org/#unsafe-request-flag
     // A request has an associated unsafe-request flag. Unless stated otherwise it is unset.

Userland/Libraries/LibWeb/Fetch/Infrastructure/HTTP/Responses.cpp

@@ -9,6 +9,11 @@
 
 namespace Web::Fetch::Infrastructure {
 
+Response::Response()
+    : m_header_list(make_ref_counted<HeaderList>())
+{
+}
+
 // https://fetch.spec.whatwg.org/#ref-for-concept-network-error%E2%91%A3
 // A network error is a response whose status is always 0, status message is always
 // the empty byte sequence, header list is always empty, and body is always null.
@@ -111,16 +116,16 @@ ErrorOr<NonnullOwnPtr<BasicFilteredResponse>> BasicFilteredResponse::create(Resp
 {
     // A basic filtered response is a filtered response whose type is "basic" and header list excludes
     // any headers in internal response’s header list whose name is a forbidden response-header name.
-    HeaderList header_list;
-    for (auto const& header : internal_response.header_list()) {
+    auto header_list = make_ref_counted<HeaderList>();
+    for (auto const& header : *internal_response.header_list()) {
         if (!is_forbidden_response_header_name(header.name))
-            TRY(header_list.append(header));
+            TRY(header_list->append(header));
     }
 
     return adopt_own(*new BasicFilteredResponse(internal_response, move(header_list)));
 }
 
-BasicFilteredResponse::BasicFilteredResponse(Response& internal_response, HeaderList header_list)
+BasicFilteredResponse::BasicFilteredResponse(Response& internal_response, NonnullRefPtr<HeaderList> header_list)
     : FilteredResponse(internal_response)
     , m_header_list(move(header_list))
 {
@@ -135,16 +140,16 @@ ErrorOr<NonnullOwnPtr<CORSFilteredResponse>> CORSFilteredResponse::create(Respon
     for (auto const& header_name : internal_response.cors_exposed_header_name_list())
         cors_exposed_header_name_list.append(header_name.span());
 
-    HeaderList header_list;
-    for (auto const& header : internal_response.header_list()) {
+    auto header_list = make_ref_counted<HeaderList>();
+    for (auto const& header : *internal_response.header_list()) {
         if (is_cors_safelisted_response_header_name(header.name, cors_exposed_header_name_list))
-            TRY(header_list.append(header));
+            TRY(header_list->append(header));
     }
 
     return adopt_own(*new CORSFilteredResponse(internal_response, move(header_list)));
 }
 
-CORSFilteredResponse::CORSFilteredResponse(Response& internal_response, HeaderList header_list)
+CORSFilteredResponse::CORSFilteredResponse(Response& internal_response, NonnullRefPtr<HeaderList> header_list)
     : FilteredResponse(internal_response)
     , m_header_list(move(header_list))
 {
@@ -159,6 +164,7 @@ NonnullOwnPtr<OpaqueFilteredResponse> OpaqueFilteredResponse::create(Response& i
 
 OpaqueFilteredResponse::OpaqueFilteredResponse(Response& internal_response)
     : FilteredResponse(internal_response)
+    , m_header_list(make_ref_counted<HeaderList>())
 {
 }
 
@@ -169,6 +175,7 @@ NonnullOwnPtr<OpaqueRedirectFilteredResponse> OpaqueRedirectFilteredResponse::cr
 
 OpaqueRedirectFilteredResponse::OpaqueRedirectFilteredResponse(Response& internal_response)
     : FilteredResponse(internal_response)
+    , m_header_list(make_ref_counted<HeaderList>())
 {
 }
 

Userland/Libraries/LibWeb/Fetch/Infrastructure/HTTP/Responses.h

@@ -47,7 +47,7 @@ public:
     [[nodiscard]] static NonnullOwnPtr<Response> aborted_network_error();
     [[nodiscard]] static NonnullOwnPtr<Response> network_error();
 
-    Response() = default;
+    Response();
     virtual ~Response() = default;
 
     [[nodiscard]] virtual Type type() const { return m_type; }
@@ -66,9 +66,9 @@ public:
     [[nodiscard]] virtual ReadonlyBytes status_message() const { return m_status_message; }
     void set_status_message(ByteBuffer status_message) { m_status_message = move(status_message); }
 
-    [[nodiscard]] virtual HeaderList const& header_list() const { return m_header_list; }
-    [[nodiscard]] HeaderList& header_list() { return m_header_list; }
-    void set_header_list(HeaderList header_list) { m_header_list = move(header_list); }
+    [[nodiscard]] virtual NonnullRefPtr<HeaderList> const& header_list() const { return m_header_list; }
+    [[nodiscard]] NonnullRefPtr<HeaderList>& header_list() { return m_header_list; }
+    void set_header_list(NonnullRefPtr<HeaderList> header_list) { m_header_list = move(header_list); }
 
     [[nodiscard]] virtual Optional<Body> const& body() const { return m_body; }
     [[nodiscard]] Optional<Body>& body() { return m_body; }
@@ -124,7 +124,7 @@ private:
 
     // https://fetch.spec.whatwg.org/#concept-response-header-list
     // A response has an associated header list (a header list). Unless stated otherwise it is empty.
-    HeaderList m_header_list;
+    NonnullRefPtr<HeaderList> m_header_list;
 
     // https://fetch.spec.whatwg.org/#concept-response-body
     // A response has an associated body (null or a body). Unless stated otherwise it is null.
@@ -169,7 +169,7 @@ public:
     [[nodiscard]] virtual Vector<AK::URL> const& url_list() const override { return m_internal_response.url_list(); }
     [[nodiscard]] virtual Status status() const override { return m_internal_response.status(); }
     [[nodiscard]] virtual ReadonlyBytes status_message() const override { return m_internal_response.status_message(); }
-    [[nodiscard]] virtual HeaderList const& header_list() const override { return m_internal_response.header_list(); }
+    [[nodiscard]] virtual NonnullRefPtr<HeaderList> const& header_list() const override { return m_internal_response.header_list(); }
     [[nodiscard]] virtual Optional<Body> const& body() const override { return m_internal_response.body(); }
     [[nodiscard]] virtual Optional<CacheState> const& cache_state() const override { return m_internal_response.cache_state(); }
     [[nodiscard]] virtual Vector<ByteBuffer> const& cors_exposed_header_name_list() const override { return m_internal_response.cors_exposed_header_name_list(); }
@@ -192,12 +192,12 @@ public:
     static ErrorOr<NonnullOwnPtr<BasicFilteredResponse>> create(Response&);
 
     [[nodiscard]] virtual Type type() const override { return Type::Basic; }
-    [[nodiscard]] virtual HeaderList const& header_list() const override { return m_header_list; }
+    [[nodiscard]] virtual NonnullRefPtr<HeaderList> const& header_list() const override { return m_header_list; }
 
 private:
-    BasicFilteredResponse(Response&, HeaderList);
+    BasicFilteredResponse(Response&, NonnullRefPtr<HeaderList>);
 
-    HeaderList m_header_list;
+    NonnullRefPtr<HeaderList> m_header_list;
 };
 
 // https://fetch.spec.whatwg.org/#concept-filtered-response-cors
@@ -206,12 +206,12 @@ public:
     static ErrorOr<NonnullOwnPtr<CORSFilteredResponse>> create(Response&);
 
     [[nodiscard]] virtual Type type() const override { return Type::CORS; }
-    [[nodiscard]] virtual HeaderList const& header_list() const override { return m_header_list; }
+    [[nodiscard]] virtual NonnullRefPtr<HeaderList> const& header_list() const override { return m_header_list; }
 
 private:
-    CORSFilteredResponse(Response&, HeaderList);
+    CORSFilteredResponse(Response&, NonnullRefPtr<HeaderList>);
 
-    HeaderList m_header_list;
+    NonnullRefPtr<HeaderList> m_header_list;
 };
 
 // https://fetch.spec.whatwg.org/#concept-filtered-response-opaque
@@ -223,14 +223,14 @@ public:
     [[nodiscard]] virtual Vector<AK::URL> const& url_list() const override { return m_url_list; }
     [[nodiscard]] virtual Status status() const override { return 0; }
     [[nodiscard]] virtual ReadonlyBytes status_message() const override { return {}; }
-    [[nodiscard]] virtual HeaderList const& header_list() const override { return m_header_list; }
+    [[nodiscard]] virtual NonnullRefPtr<HeaderList> const& header_list() const override { return m_header_list; }
     [[nodiscard]] virtual Optional<Body> const& body() const override { return m_body; }
 
 private:
     explicit OpaqueFilteredResponse(Response&);
 
     Vector<AK::URL> m_url_list;
-    HeaderList m_header_list;
+    NonnullRefPtr<HeaderList> m_header_list;
     Optional<Body> m_body;
 };
 
@@ -242,13 +242,13 @@ public:
     [[nodiscard]] virtual Type type() const override { return Type::OpaqueRedirect; }
     [[nodiscard]] virtual Status status() const override { return 0; }
     [[nodiscard]] virtual ReadonlyBytes status_message() const override { return {}; }
-    [[nodiscard]] virtual HeaderList const& header_list() const override { return m_header_list; }
+    [[nodiscard]] virtual NonnullRefPtr<HeaderList> const& header_list() const override { return m_header_list; }
     [[nodiscard]] virtual Optional<Body> const& body() const override { return m_body; }
 
 private:
     explicit OpaqueRedirectFilteredResponse(Response&);
 
-    HeaderList m_header_list;
+    NonnullRefPtr<HeaderList> m_header_list;
     Optional<Body> m_body;
 };