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LibWeb/HTML: Update worker construction spec steps

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This is largely editorial. One behaviour change is that events are now
sent from a global task on the DOMManipulation task source.

Somewhat awkwardly, the spec refers to `this` before the Worker exists.
As it's for getting the relevant global object / settings object, I've
had to work around that.

Corresponds to:
917c2f6a73
This commit is contained in:
Sam Atkins 2025-11-27 11:37:53 +00:00 • committed by Andreas Kling
parent edac716e91
commit 62d7011f45
Notes: github-actions[bot] 2025-12-01 14:03:44 +00:00
6 changed files with 129 additions and 103 deletions
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91
Libraries/LibWeb/HTML/SharedWorker.cpp
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@ -27,7 +27,7 @@ GC_DEFINE_ALLOCATOR(SharedWorker);
// https://html.spec.whatwg.org/multipage/workers.html#dom-sharedworker
WebIDL::ExceptionOr<GC::Ref<SharedWorker>> SharedWorker::construct_impl(JS::Realm& realm, TrustedTypes::TrustedScriptURLOrString const& script_url, Variant<String, WorkerOptions>& options_value)
{
// 1. Let compliantScriptURL be the result of invoking the Get Trusted Type compliant string algorithm with
// 1. Let compliantScriptURL be the result of invoking the get trusted type compliant string algorithm with
// TrustedScriptURL, this's relevant global object, scriptURL, "SharedWorker constructor", and "script".
auto const compliant_script_url = TRY(get_trusted_type_compliant_string(
TrustedTypes::TrustedTypeName::TrustedScriptURL,
@ -36,8 +36,8 @@ WebIDL::ExceptionOr<GC::Ref<SharedWorker>> SharedWorker::construct_impl(JS::Real
TrustedTypes::InjectionSink::SharedWorker_constructor,
TrustedTypes::Script.to_string()));
// 2. If options is a DOMString, set options to a new WorkerOptions dictionary whose name member is set to the value
// of options and whose other members are set to their default values.
// 2. If options is a DOMString, set options to a new WorkerOptions dictionary whose name member is set to the
// value of options and whose other members are set to their default values.
auto options = options_value.visit(
[&](String& options) {
return WorkerOptions { .name = move(options) };
@ -46,59 +46,64 @@ WebIDL::ExceptionOr<GC::Ref<SharedWorker>> SharedWorker::construct_impl(JS::Real
return move(options);
});
// 3. Let outside settings be the current settings object.
// 3. Let outside settings be this's relevant settings object.
// FIXME: We don't have a `this` yet, so use the current principal settings object, as the previous spec did.
auto& outside_settings = current_principal_settings_object();
// 4. Let urlRecord be the result of encoding-parsing a URL given compliantScriptURL, relative to outside settings.
// 4. Let urlRecord be the result of encoding-parsing a URL given compliantScriptURL, relative to outsideSettings.
auto url = outside_settings.encoding_parse_url(compliant_script_url.to_utf8_but_should_be_ported_to_utf16());
// 5. If urlRecord is failure, then throw a "SyntaxError" DOMException.
if (!url.has_value())
return WebIDL::SyntaxError::create(realm, "SharedWorker constructed with invalid URL"_utf16);
// 7. Let outside port be a new MessagePort in outside settings's realm.
// NOTE: We do this first so that we can store the port as a GC::Ref.
// 6. Let outsidePort be a new MessagePort in outsideSettings's realm.
auto outside_port = MessagePort::create(outside_settings.realm());
// 6. Let worker be a new SharedWorker object.
// 8. Assign outside port to the port attribute of worker.
// 10. Let worker be this.
// AD-HOC: We do this first so that we can use `this`.
// 7. Set this's port to outsidePort.
auto worker = realm.create<SharedWorker>(realm, url.release_value(), options, outside_port);
// 9. Let callerIsSecureContext be true if outside settings is a secure context; otherwise, false.
// 8. Let callerIsSecureContext be true if outside settings is a secure context; otherwise, false.
auto caller_is_secure_context = HTML::is_secure_context(outside_settings);
// 10. Let outside storage key be the result of running obtain a storage key for non-storage purposes given outside settings.
// 9. Let outsideStorageKey be the result of running obtain a storage key for non-storage purposes given outsideSettings.
auto outside_storage_key = StorageAPI::obtain_a_storage_key_for_non_storage_purposes(outside_settings);
// 10. Let worker be this.
// NB: This is done earlier.
// 11. Enqueue the following steps to the shared worker manager:
// FIXME: "A user agent has an associated shared worker manager which is the result of starting a new parallel queue."
// We just use the singular global event loop for now.
Platform::EventLoopPlugin::the().deferred_invoke(GC::create_function(realm.heap(), [worker, outside_port, &outside_settings, caller_is_secure_context, outside_storage_key = move(outside_storage_key)]() mutable {
// 1. Let worker global scope be null.
// 1. Let workerGlobalScope be null.
GC::Ptr<SharedWorkerGlobalScope> worker_global_scope;
// 2. For each scope in the list of all SharedWorkerGlobalScope objects:
for (auto& scope : all_shared_worker_global_scopes()) {
// 1. Let worker storage key be the result of running obtain a storage key for non-storage purposes given
// 1. Let workerStorageKey be the result of running obtain a storage key for non-storage purposes given
// scope's relevant settings object.
auto worker_storage_key = StorageAPI::obtain_a_storage_key_for_non_storage_purposes(HTML::relevant_settings_object(scope));
// 2. If all of the following are true:
if (
// * worker storage key equals outside storage key;
// * workerStorageKey equals outsideStorageKey;
worker_storage_key == outside_storage_key
// * scope's closing flag is false;
&& !scope->is_closing()
// * scope's constructor url equals urlRecord; and
// * scope's constructor URL equals urlRecord; and
&& scope->url() == worker->m_script_url
// * scope's name equals the value of options's name member,
// * scope's name equals options["name"],
&& scope->name() == worker->m_options.name)
// then:
{
// 1. Set worker global scope to scope.
// 1. Set workerGlobalScope to scope.
worker_global_scope = scope;
// 2. Break.
@ -106,43 +111,41 @@ WebIDL::ExceptionOr<GC::Ref<SharedWorker>> SharedWorker::construct_impl(JS::Real
}
}
// FIXME: 3. If worker global scope is not null, but the user agent has been configured to disallow communication
// between the worker represented by the worker global scope and the scripts whose settings object is outside
// settings, then set worker global scope to null.
// FIXME: 4. If worker global scope is not null, then check if worker global scope's type and credentials match the
// options values. If not, queue a task to fire an event named error and abort these steps.
// FIXME: 3. If workerGlobalScope is not null, but the user agent has been configured to disallow communication between the worker represented by the workerGlobalScope and the scripts whose settings object is outsideSettings, then set workerGlobalScope to null.
// FIXME: 4. If workerGlobalScope is not null, and any of the following are true: ...
// 5. If worker global scope is not null, then run these subsubsteps:
// 5. If workerGlobalScope is not null:
if (worker_global_scope) {
// 1. Let settings object be the relevant settings object for worker global scope.
auto& settings_object = HTML::relevant_settings_object(*worker_global_scope);
// 1. Let insideSettings be workerGlobalScope's relevant settings object.
auto& inside_settings = relevant_settings_object(*worker_global_scope);
// 2. Let workerIsSecureContext be true if settings object is a secure context; otherwise, false.
auto worker_is_secure_context = HTML::is_secure_context(settings_object);
// 2. Let workerIsSecureContext be true if insideSettings is a secure context; otherwise, false.
auto worker_is_secure_context = is_secure_context(inside_settings);
// 3. If workerIsSecureContext is not callerIsSecureContext, then queue a task to fire an event named error
// at worker and abort these steps. [SECURE-CONTEXTS]
// 3. If workerIsSecureContext is not callerIsSecureContext:
if (worker_is_secure_context != caller_is_secure_context) {
queue_a_task(HTML::Task::Source::Unspecified, nullptr, nullptr, GC::create_function(worker->heap(), [worker]() {
worker->dispatch_event(DOM::Event::create(worker->realm(), HTML::EventNames::error));
// 1. Queue a global task on the DOM manipulation task source given worker's relevant global object to fire an event named error at worker.
queue_global_task(Task::Source::DOMManipulation, relevant_global_object(worker), GC::create_function(worker->heap(), [worker]() {
worker->dispatch_event(DOM::Event::create(worker->realm(), EventNames::error));
}));
// 2. Abort these steps.
return;
}
// FIXME: 4. Associate worker with worker global scope.
// FIXME: 4. Associate worker with workerGlobalScope.
// 5. Let inside port be a new MessagePort in settings object's realm.
auto inside_port = HTML::MessagePort::create(settings_object.realm());
// 5. Let insidePort be a new MessagePort in insideSettings's realm.
auto inside_port = HTML::MessagePort::create(inside_settings.realm());
// 6. Entangle outside port and inside port.
// 6. Entangle outsidePort and insidePort.
outside_port->entangle_with(inside_port);
// 7. Queue a task, using the DOM manipulation task source, to fire an event named connect at worker global
// scope, using MessageEvent, with the data attribute initialized to the empty string, the ports attribute
// initialized to a new frozen array containing only inside port, and the source attribute initialized to
// inside port.
queue_a_task(HTML::Task::Source::DOMManipulation, nullptr, nullptr, GC::create_function(worker->heap(), [worker_global_scope, inside_port]() {
// 7. Queue a global task on the DOM manipulation task source given workerGlobalScope to fire an event
// named connect at workerGlobalScope, using MessageEvent, with the data attribute initialized to the
// empty string, the ports attribute initialized to a new frozen array containing only insidePort, and
// the source attribute initialized to insidePort.
queue_global_task(Task::Source::DOMManipulation, *worker_global_scope, GC::create_function(worker->heap(), [worker_global_scope, inside_port]() {
auto& realm = worker_global_scope->realm();
MessageEventInit init;
@ -150,18 +153,18 @@ WebIDL::ExceptionOr<GC::Ref<SharedWorker>> SharedWorker::construct_impl(JS::Real
init.ports.append(inside_port);
init.source = inside_port;
worker_global_scope->dispatch_event(MessageEvent::create(realm, HTML::EventNames::connect, init));
worker_global_scope->dispatch_event(MessageEvent::create(realm, EventNames::connect, init));
}));
// FIXME: 8. Append the relevant owner to add given outside settings to worker global scope's owner set.
// FIXME: 8. Append the relevant owner to add given outsideSettings to workerGlobalScope's owner set.
}
// 6. Otherwise, in parallel, run a worker given worker, urlRecord, outside settings, outside port, and options.
// 6. Otherwise, in parallel, run a worker given worker, urlRecord, outsideSettings, outsidePort, and options.
else {
run_a_worker(worker, worker->m_script_url, outside_settings, outside_port, worker->m_options);
}
}));
// 12. Return worker.
return worker;
}