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// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/modules/webusb/worker_navigator_usb.h"
#include "third_party/blink/renderer/core/workers/worker_navigator.h"
#include "third_party/blink/renderer/modules/webusb/usb.h"
#include "third_party/blink/renderer/platform/runtime_enabled_features.h"
namespace blink {
WorkerNavigatorUSB& WorkerNavigatorUSB::From(
WorkerNavigator& worker_navigator) {
WorkerNavigatorUSB* supplement =
Supplement<WorkerNavigator>::From<WorkerNavigatorUSB>(worker_navigator);
if (!supplement) {
supplement = new WorkerNavigatorUSB(worker_navigator);
ProvideTo(worker_navigator, supplement);
}
return *supplement;
}
// static
USB* WorkerNavigatorUSB::usb(ScriptState* script_state,
WorkerNavigator& worker_navigator) {
return WorkerNavigatorUSB::From(worker_navigator).usb(script_state);
}
USB* WorkerNavigatorUSB::usb(ScriptState* script_state) {
// A bug in the WebIDL compiler causes this attribute to be incorrectly
// exposed in the other worker contexts if one of the RuntimeEnabled flags is
// enabled. Therefore, we will just return the empty usb_ member if the
// appropriate flag is not enabled for the current context, or if the
// current context is a ServiceWorkerGlobalScope.
// TODO(https://crbug.com/839117): Once this attribute stops being incorrectly
// exposed to the worker contexts, remove these checks.
if (!usb_) {
ExecutionContext* context = ExecutionContext::From(script_state);
DCHECK(context);
bool isDedicatedWorkerAndEnabled =
context->IsDedicatedWorkerGlobalScope() &&
RuntimeEnabledFeatures::WebUSBOnDedicatedWorkersEnabled();
if (isDedicatedWorkerAndEnabled) {
usb_ = USB::Create(*context);
}
}
return usb_;
}
void WorkerNavigatorUSB::Trace(blink::Visitor* visitor) {
visitor->Trace(usb_);
Supplement<WorkerNavigator>::Trace(visitor);
}
WorkerNavigatorUSB::WorkerNavigatorUSB(WorkerNavigator& worker_navigator)
: Supplement<WorkerNavigator>(worker_navigator) {}
const char WorkerNavigatorUSB::kSupplementName[] = "WorkerNavigatorUSB";
} // namespace blink
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