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ffad902c07
Unlike ensure_web_prototype<T>(), the cached version doesn't require the prototype type to be fully formed, so we can use it without including the FooPrototype.h header. It's also a bit less verbose. :^)
127 lines
4.6 KiB
C++
127 lines
4.6 KiB
C++
/*
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* Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibWeb/DOM/EventDispatcher.h>
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#include <LibWeb/HTML/EventHandler.h>
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#include <LibWeb/HTML/EventLoop/EventLoop.h>
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#include <LibWeb/HTML/EventNames.h>
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#include <LibWeb/HTML/MessageEvent.h>
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#include <LibWeb/HTML/MessagePort.h>
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namespace Web::HTML {
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JS::NonnullGCPtr<MessagePort> MessagePort::create(HTML::Window& window)
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{
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return *window.heap().allocate<MessagePort>(window.realm(), window);
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}
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MessagePort::MessagePort(HTML::Window& window)
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: DOM::EventTarget(window.realm())
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{
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set_prototype(&window.cached_web_prototype("MessagePort"));
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}
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MessagePort::~MessagePort() = default;
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void MessagePort::visit_edges(Cell::Visitor& visitor)
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{
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Base::visit_edges(visitor);
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visitor.visit(m_remote_port.ptr());
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}
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void MessagePort::disentangle()
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{
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m_remote_port->m_remote_port = nullptr;
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m_remote_port = nullptr;
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}
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// https://html.spec.whatwg.org/multipage/web-messaging.html#entangle
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void MessagePort::entangle_with(MessagePort& remote_port)
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{
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if (m_remote_port.ptr() == &remote_port)
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return;
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// 1. If one of the ports is already entangled, then disentangle it and the port that it was entangled with.
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if (is_entangled())
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disentangle();
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if (remote_port.is_entangled())
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remote_port.disentangle();
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// 2. Associate the two ports to be entangled, so that they form the two parts of a new channel.
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// (There is no MessageChannel object that represents this channel.)
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remote_port.m_remote_port = this;
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m_remote_port = &remote_port;
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}
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// https://html.spec.whatwg.org/multipage/web-messaging.html#dom-messageport-postmessage
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void MessagePort::post_message(JS::Value message)
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{
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// 1. Let targetPort be the port with which this MessagePort is entangled, if any; otherwise let it be null.
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auto* target_port = m_remote_port.ptr();
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// FIXME: 2. Let options be «[ "transfer" → transfer ]».
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// 3. Run the message port post message steps providing targetPort, message and options.
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// https://html.spec.whatwg.org/multipage/web-messaging.html#message-port-post-message-steps
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// FIXME: 1. Let transfer be options["transfer"].
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// FIXME: 2. If transfer contains this MessagePort, then throw a "DataCloneError" DOMException.
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// 3. Let doomed be false.
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bool doomed = false;
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// FIXME: 4. If targetPort is not null and transfer contains targetPort, then set doomed to true and optionally report to a developer console that the target port was posted to itself, causing the communication channel to be lost.
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// FIXME: 5. Let serializeWithTransferResult be StructuredSerializeWithTransfer(message, transfer). Rethrow any exceptions.
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// 6. If targetPort is null, or if doomed is true, then return.
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if (!target_port || doomed)
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return;
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// FIXME: 7. Add a task that runs the following steps to the port message queue of targetPort:
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// FIXME: This is an ad-hoc hack implementation instead, since we don't currently
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// have serialization and deserialization of messages.
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main_thread_event_loop().task_queue().add(HTML::Task::create(HTML::Task::Source::PostedMessage, nullptr, [strong_port = JS::make_handle(*target_port), message]() mutable {
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MessageEventInit event_init {};
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event_init.data = message;
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event_init.origin = "<origin>";
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strong_port->dispatch_event(*MessageEvent::create(verify_cast<HTML::Window>(strong_port->realm().global_object()), HTML::EventNames::message, event_init));
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}));
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}
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void MessagePort::start()
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{
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// FIXME: Message ports are supposed to be disabled by default.
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}
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// https://html.spec.whatwg.org/multipage/web-messaging.html#dom-messageport-close
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void MessagePort::close()
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{
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// 1. Set this MessagePort object's [[Detached]] internal slot value to true.
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m_detached = true;
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// 2. If this MessagePort object is entangled, disentangle it.
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if (is_entangled())
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disentangle();
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}
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#undef __ENUMERATE
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#define __ENUMERATE(attribute_name, event_name) \
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void MessagePort::set_##attribute_name(Bindings::CallbackType* value) \
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{ \
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set_event_handler_attribute(event_name, value); \
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} \
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Bindings::CallbackType* MessagePort::attribute_name() \
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{ \
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return event_handler_attribute(event_name); \
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}
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ENUMERATE_MESSAGE_PORT_EVENT_HANDLERS(__ENUMERATE)
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#undef __ENUMERATE
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}
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