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/*
* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2021, the SerenityOS developers.
* Copyright (c) 2021, Sam Atkins <atkinssj@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/ByteBuffer.h>
#include <AK/Debug.h>
#include <AK/URL.h>
#include <LibWeb/CSS/Parser/Parser.h>
#include <LibWeb/DOM/Document.h>
#include <LibWeb/HTML/HTMLLinkElement.h>
#include <LibWeb/Infra/CharacterTypes.h>
#include <LibWeb/Loader/ResourceLoader.h>
#include <LibWeb/Page/Page.h>
#include <LibWeb/Platform/ImageCodecPlugin.h>
namespace Web::HTML {
HTMLLinkElement::HTMLLinkElement(DOM::Document& document, DOM::QualifiedName qualified_name)
: HTMLElement(document, move(qualified_name))
{
}
HTMLLinkElement::~HTMLLinkElement() = default;
void HTMLLinkElement::initialize(JS::Realm& realm)
{
Base::initialize(realm);
set_prototype(&Bindings::ensure_web_prototype<Bindings::HTMLLinkElementPrototype>(realm, "HTMLLinkElement"));
}
void HTMLLinkElement::inserted()
{
if (has_attribute(AttributeNames::disabled) && (m_relationship & Relationship::Stylesheet))
return;
HTMLElement::inserted();
if (m_relationship & Relationship::Stylesheet && !(m_relationship & Relationship::Alternate)) {
auto url = document().parse_url(href());
dbgln_if(CSS_LOADER_DEBUG, "HTMLLinkElement: Loading import URL: {}", url);
auto request = LoadRequest::create_for_url_on_page(url, document().page());
// NOTE: Mark this element as delaying the document load event *before* calling set_resource()
// as it may trigger a synchronous resource_did_load() callback.
m_document_load_event_delayer.emplace(document());
set_resource(ResourceLoader::the().load_resource(Resource::Type::Generic, request));
// NOTE: If we ended up not loading a resource for whatever reason, don't delay the load event.
if (!resource())
m_document_load_event_delayer.clear();
}
if (m_relationship & Relationship::Preload) {
// FIXME: Respect the "as" attribute.
LoadRequest request;
request.set_url(document().parse_url(attribute(HTML::AttributeNames::href)));
m_preload_resource = ResourceLoader::the().load_resource(Resource::Type::Generic, request);
} else if (m_relationship & Relationship::DNSPrefetch) {
ResourceLoader::the().prefetch_dns(document().parse_url(attribute(HTML::AttributeNames::href)));
} else if (m_relationship & Relationship::Preconnect) {
ResourceLoader::the().preconnect(document().parse_url(attribute(HTML::AttributeNames::href)));
} else if (m_relationship & Relationship::Icon) {
auto favicon_url = document().parse_url(href());
auto favicon_request = LoadRequest::create_for_url_on_page(favicon_url, document().page());
set_resource(ResourceLoader::the().load_resource(Resource::Type::Generic, favicon_request));
}
}
bool HTMLLinkElement::has_loaded_icon() const
{
return m_relationship & Relationship::Icon && resource() && resource()->is_loaded() && resource()->has_encoded_data();
}
void HTMLLinkElement::parse_attribute(DeprecatedFlyString const& name, DeprecatedString const& value)
{
// 4.6.7 Link types - https://html.spec.whatwg.org/multipage/links.html#linkTypes
if (name == HTML::AttributeNames::rel) {
m_relationship = 0;
// Keywords are always ASCII case-insensitive, and must be compared as such.
auto lowercased_value = value.to_lowercase();
// To determine which link types apply to a link, a, area, or form element,
// the element's rel attribute must be split on ASCII whitespace.
// The resulting tokens are the keywords for the link types that apply to that element.
auto parts = lowercased_value.split_view(Infra::is_ascii_whitespace);
for (auto& part : parts) {
if (part == "stylesheet"sv)
m_relationship |= Relationship::Stylesheet;
else if (part == "alternate"sv)
m_relationship |= Relationship::Alternate;
else if (part == "preload"sv)
m_relationship |= Relationship::Preload;
else if (part == "dns-prefetch"sv)
m_relationship |= Relationship::DNSPrefetch;
else if (part == "preconnect"sv)
m_relationship |= Relationship::Preconnect;
else if (part == "icon"sv)
m_relationship |= Relationship::Icon;
}
}
if (name == HTML::AttributeNames::disabled && (m_relationship & Relationship::Stylesheet) && m_loaded_style_sheet)
document().style_sheets().remove_sheet(*m_loaded_style_sheet);
}
void HTMLLinkElement::resource_did_fail()
{
dbgln_if(CSS_LOADER_DEBUG, "HTMLLinkElement: Resource did fail. URL: {}", resource()->url());
m_document_load_event_delayer.clear();
}
void HTMLLinkElement::resource_did_load()
{
VERIFY(resource());
VERIFY(m_relationship & (Relationship::Stylesheet | Relationship::Icon));
if (m_relationship & Relationship::Stylesheet)
resource_did_load_stylesheet();
if (m_relationship & Relationship::Icon)
resource_did_load_favicon();
}
void HTMLLinkElement::did_remove_attribute(DeprecatedFlyString const& attr)
{
if (attr == HTML::AttributeNames::disabled && (m_relationship & Relationship::Stylesheet)) {
if (!resource())
inserted();
else
resource_did_load_stylesheet();
}
}
void HTMLLinkElement::resource_did_load_stylesheet()
{
VERIFY(m_relationship & Relationship::Stylesheet);
m_document_load_event_delayer.clear();
if (!resource()->has_encoded_data()) {
dbgln_if(CSS_LOADER_DEBUG, "HTMLLinkElement: Resource did load, no encoded data. URL: {}", resource()->url());
} else {
dbgln_if(CSS_LOADER_DEBUG, "HTMLLinkElement: Resource did load, has encoded data. URL: {}", resource()->url());
if (resource()->mime_type() != "text/css"sv) {
dbgln_if(CSS_LOADER_DEBUG, "HTMLLinkElement: Resource did load, but MIME type was {} instead of text/css. URL: {}", resource()->mime_type(), resource()->url());
return;
}
}
CSS::CSSStyleSheet* sheet = m_loaded_style_sheet;
if (!sheet) {
sheet = parse_css_stylesheet(CSS::Parser::ParsingContext(document(), resource()->url()), resource()->encoded_data());
if (!sheet) {
dbgln_if(CSS_LOADER_DEBUG, "HTMLLinkElement: Failed to parse stylesheet: {}", resource()->url());
return;
}
m_loaded_style_sheet = sheet;
}
sheet->set_owner_node(this);
document().style_sheets().add_sheet(*sheet);
}
void HTMLLinkElement::resource_did_load_favicon()
{
VERIFY(m_relationship & (Relationship::Icon));
if (!resource()->has_encoded_data()) {
dbgln_if(SPAM_DEBUG, "Favicon downloaded, no encoded data");
return;
}
dbgln_if(SPAM_DEBUG, "Favicon downloaded, {} bytes from {}", resource()->encoded_data().size(), resource()->url());
document().check_favicon_after_loading_link_resource();
}
bool HTMLLinkElement::load_favicon_and_use_if_window_is_active()
{
if (!has_loaded_icon())
return false;
RefPtr<Gfx::Bitmap> favicon_bitmap;
auto decoded_image = Platform::ImageCodecPlugin::the().decode_image(resource()->encoded_data());
if (!decoded_image.has_value() || decoded_image->frames.is_empty()) {
dbgln("Could not decode favicon {}", resource()->url());
return false;
}
favicon_bitmap = decoded_image->frames[0].bitmap;
dbgln_if(IMAGE_DECODER_DEBUG, "Decoded favicon, {}", favicon_bitmap->size());
auto* page = document().page();
if (!page)
return favicon_bitmap;
if (document().browsing_context() == &page->top_level_browsing_context())
if (favicon_bitmap) {
page->client().page_did_change_favicon(*favicon_bitmap);
return true;
}
return false;
}
void HTMLLinkElement::visit_edges(Cell::Visitor& visitor)
{
Base::visit_edges(visitor);
visitor.visit(m_loaded_style_sheet);
}
}
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