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https://github.com/RGBCube/serenity
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LibWeb: Implement loading a favicon in absence of a <link> icon element
For example, serenityos.org does not contain a <link rel="icon"> element to indicate its favicon. Before navigables, we implemented attempting to load a fallback favicon in a rather ad-hoc manner. This implements the full spec steps to do so after the HTML document is parsed.
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3 changed files with 62 additions and 15 deletions
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@ -1887,6 +1887,8 @@ void Document::update_readiness(HTML::DocumentReadyState readiness_value)
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dispatch_event(Event::create(realm(), HTML::EventNames::readystatechange));
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dispatch_event(Event::create(realm(), HTML::EventNames::readystatechange));
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if (readiness_value == HTML::DocumentReadyState::Complete && is_active() && navigable()->is_traversable()) {
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if (readiness_value == HTML::DocumentReadyState::Complete && is_active() && navigable()->is_traversable()) {
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HTML::HTMLLinkElement::load_fallback_favicon_if_needed(*this).release_value_but_fixme_should_propagate_errors();
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if (auto* page = navigable()->traversable_navigable()->page()) {
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if (auto* page = navigable()->traversable_navigable()->page()) {
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page->client().page_did_finish_loading(url());
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page->client().page_did_finish_loading(url());
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}
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}
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@ -439,30 +439,73 @@ void HTMLLinkElement::resource_did_load_favicon()
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document().check_favicon_after_loading_link_resource();
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document().check_favicon_after_loading_link_resource();
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}
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}
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static bool decode_favicon(ReadonlyBytes favicon_data, AK::URL const& favicon_url, JS::GCPtr<Navigable> navigable)
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{
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auto decoded_image = Platform::ImageCodecPlugin::the().decode_image(favicon_data);
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if (!decoded_image.has_value() || decoded_image->frames.is_empty()) {
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dbgln("Could not decode favicon {}", favicon_url);
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return false;
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}
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auto favicon_bitmap = decoded_image->frames[0].bitmap;
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dbgln_if(IMAGE_DECODER_DEBUG, "Decoded favicon, {}", favicon_bitmap->size());
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if (navigable && navigable->is_traversable())
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navigable->traversable_navigable()->page()->client().page_did_change_favicon(*favicon_bitmap);
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return favicon_bitmap;
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}
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bool HTMLLinkElement::load_favicon_and_use_if_window_is_active()
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bool HTMLLinkElement::load_favicon_and_use_if_window_is_active()
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{
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{
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if (!has_loaded_icon())
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if (!has_loaded_icon())
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return false;
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return false;
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RefPtr<Gfx::Bitmap> favicon_bitmap;
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return decode_favicon(resource()->encoded_data(), resource()->url(), navigable());
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auto decoded_image = Platform::ImageCodecPlugin::the().decode_image(resource()->encoded_data());
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}
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if (!decoded_image.has_value() || decoded_image->frames.is_empty()) {
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dbgln("Could not decode favicon {}", resource()->url());
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return false;
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}
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favicon_bitmap = decoded_image->frames[0].bitmap;
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// https://html.spec.whatwg.org/multipage/links.html#rel-icon:the-link-element-3
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dbgln_if(IMAGE_DECODER_DEBUG, "Decoded favicon, {}", favicon_bitmap->size());
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WebIDL::ExceptionOr<void> HTMLLinkElement::load_fallback_favicon_if_needed(JS::NonnullGCPtr<DOM::Document> document)
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{
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auto& realm = document->realm();
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auto& vm = realm.vm();
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auto* page = document().page();
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// In the absence of a link with the icon keyword, for Document objects whose URL's scheme is an HTTP(S) scheme,
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if (!page)
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// user agents may instead run these steps in parallel:
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return favicon_bitmap;
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if (document->has_active_favicon())
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return {};
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if (!document->url().scheme().is_one_of("http"sv, "https"sv))
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return {};
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if (navigable() && navigable()->is_traversable()) {
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// 1. Let request be a new request whose URL is the URL record obtained by resolving the URL "/favicon.ico" against
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navigable()->traversable_navigable()->page()->client().page_did_change_favicon(*favicon_bitmap);
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// the Document object's URL, client is the Document object's relevant settings object, destination is "image",
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}
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// synchronous flag is set, credentials mode is "include", and whose use-URL-credentials flag is set.
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// NOTE: Fetch requests no longer have a synchronous flag, see https://github.com/whatwg/fetch/pull/1165
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auto request = Fetch::Infrastructure::Request::create(vm);
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request->set_url(document->parse_url("/favicon.ico"sv));
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request->set_client(&document->relevant_settings_object());
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request->set_destination(Fetch::Infrastructure::Request::Destination::Image);
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request->set_credentials_mode(Fetch::Infrastructure::Request::CredentialsMode::Include);
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request->set_use_url_credentials(true);
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return true;
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// 2. Let response be the result of fetching request.
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Fetch::Infrastructure::FetchAlgorithms::Input fetch_algorithms_input {};
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fetch_algorithms_input.process_response = [document, request](JS::NonnullGCPtr<Fetch::Infrastructure::Response> response) {
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auto& realm = document->realm();
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auto global = JS::NonnullGCPtr { realm.global_object() };
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auto process_body = [document, request](auto body) {
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decode_favicon(body, request->url(), document->navigable());
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};
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auto process_body_error = [](auto) {
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};
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// 3. Use response's unsafe response as an icon as if it had been declared using the icon keyword.
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response->unsafe_response()->body()->fully_read(realm, move(process_body), move(process_body_error), global).release_value_but_fixme_should_propagate_errors();
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};
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TRY(Fetch::Fetching::fetch(realm, request, Fetch::Infrastructure::FetchAlgorithms::create(vm, move(fetch_algorithms_input))));
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return {};
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}
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}
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void HTMLLinkElement::visit_edges(Cell::Visitor& visitor)
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void HTMLLinkElement::visit_edges(Cell::Visitor& visitor)
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@ -35,6 +35,8 @@ public:
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bool has_loaded_icon() const;
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bool has_loaded_icon() const;
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bool load_favicon_and_use_if_window_is_active();
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bool load_favicon_and_use_if_window_is_active();
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static WebIDL::ExceptionOr<void> load_fallback_favicon_if_needed(JS::NonnullGCPtr<DOM::Document>);
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private:
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private:
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HTMLLinkElement(DOM::Document&, DOM::QualifiedName);
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HTMLLinkElement(DOM::Document&, DOM::QualifiedName);
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