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LibWeb: Add a Transferable interface to model the transferable property

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This property is only shared by MessagePort and a few Image related APIs
but is important for the Structured{De}SerializeWithTransfer AOs.
This commit is contained in:
Andrew Kaster 2023-12-07 15:52:08 -07:00 • committed by Andreas Kling
parent 512624f31a
commit e21d1078a0
4 changed files with 107 additions and 5 deletions
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43
Userland/Libraries/LibWeb/HTML/MessagePort.cpp
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@ -40,6 +40,47 @@ void MessagePort::visit_edges(Cell::Visitor& visitor)
visitor.visit(m_remote_port);
}
// https://html.spec.whatwg.org/multipage/web-messaging.html#message-ports:transfer-steps
WebIDL::ExceptionOr<void> MessagePort::transfer_steps(HTML::TransferDataHolder&)
{
// 1. Set value's has been shipped flag to true.
m_has_been_shipped = true;
// FIXME: 2. Set dataHolder.[[PortMessageQueue]] to value's port message queue.
// FIXME: Support delivery of messages that haven't been delivered yet on the other side
// 3. If value is entangled with another port remotePort, then:
if (is_entangled()) {
// 1. Set remotePort's has been shipped flag to true.
m_remote_port->m_has_been_shipped = true;
// 2. Set dataHolder.[[RemotePort]] to remotePort.
// FIXME: Append an IPC::File to the dataHolder
}
// 4. Otherwise, set dataHolder.[[RemotePort]] to null.
else {
// FIXME: Note in the dataHolder that there are no fds
}
return {};
}
WebIDL::ExceptionOr<void> MessagePort::transfer_receiving_steps(HTML::TransferDataHolder const&)
{
// 1. Set value's has been shipped flag to true.
m_has_been_shipped = true;
// FIXME 2. Move all the tasks that are to fire message events in dataHolder.[[PortMessageQueue]] to the port message queue of value,
// if any, leaving value's port message queue in its initial disabled state, and, if value's relevant global object is a Window,
// associating the moved tasks with value's relevant global object's associated Document.
// FIXME: 3. If dataHolder.[[RemotePort]] is not null, then entangle dataHolder.[[RemotePort]] and value.
// (This will disentangle dataHolder.[[RemotePort]] from the original port that was transferred.)
return {};
}
void MessagePort::disentangle()
{
m_remote_port->m_remote_port = nullptr;
@ -112,7 +153,7 @@ void MessagePort::start()
void MessagePort::close()
{
// 1. Set this MessagePort object's [[Detached]] internal slot value to true.
m_detached = true;
set_detached(true);
// 2. If this MessagePort object is entangled, disentangle it.
if (is_entangled())