third_party/WebKit/Source/modules/serviceworkers/ForeignFetchEvent.cpp

// Copyright 2016 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 "modules/serviceworkers/ForeignFetchEvent.h"

#include "bindings/core/v8/ToV8.h"
#include "bindings/core/v8/V8HiddenValue.h"
#include "modules/fetch/Request.h"
#include "modules/serviceworkers/ServiceWorkerGlobalScope.h"
#include "wtf/RefPtr.h"

namespace blink {

ForeignFetchEvent* ForeignFetchEvent::create(
    ScriptState* scriptState,
    const AtomicString& type,
    const ForeignFetchEventInit& initializer) {
  return new ForeignFetchEvent(scriptState, type, initializer, nullptr,
                               nullptr);
}

ForeignFetchEvent* ForeignFetchEvent::create(
    ScriptState* scriptState,
    const AtomicString& type,
    const ForeignFetchEventInit& initializer,
    ForeignFetchRespondWithObserver* respondWithObserver,
    WaitUntilObserver* waitUntilObserver) {
  return new ForeignFetchEvent(scriptState, type, initializer,
                               respondWithObserver, waitUntilObserver);
}

Request* ForeignFetchEvent::request() const {
  return m_request;
}

String ForeignFetchEvent::origin() const {
  return m_origin;
}

void ForeignFetchEvent::respondWith(ScriptState* scriptState,
                                    ScriptPromise scriptPromise,
                                    ExceptionState& exceptionState) {
  stopImmediatePropagation();
  if (m_observer)
    m_observer->respondWith(scriptState, scriptPromise, exceptionState);
}

const AtomicString& ForeignFetchEvent::interfaceName() const {
  return EventNames::ForeignFetchEvent;
}

ForeignFetchEvent::ForeignFetchEvent(
    ScriptState* scriptState,
    const AtomicString& type,
    const ForeignFetchEventInit& initializer,
    ForeignFetchRespondWithObserver* respondWithObserver,
    WaitUntilObserver* waitUntilObserver)
    : ExtendableEvent(type, initializer, waitUntilObserver),
      m_observer(respondWithObserver) {
  if (initializer.hasOrigin())
    m_origin = initializer.origin();
  if (initializer.hasRequest()) {
    m_request = initializer.request();
    ScriptState::Scope scope(scriptState);
    m_request = initializer.request();
    v8::Local<v8::Value> request = toV8(m_request, scriptState);
    v8::Local<v8::Value> event = toV8(this, scriptState);
    if (event.IsEmpty()) {
      // |toV8| can return an empty handle when the worker is terminating.
      // We don't want the renderer to crash in such cases.
      // TODO(yhirano): Replace this branch with an assertion when the
      // graceful shutdown mechanism is introduced.
      return;
    }
    DCHECK(event->IsObject());
    // Sets a hidden value in order to teach V8 the dependency from
    // the event to the request.
    V8HiddenValue::setHiddenValue(
        scriptState, event.As<v8::Object>(),
        V8HiddenValue::requestInFetchEvent(scriptState->isolate()), request);
    // From the same reason as above, setHiddenValue can return false.
    // TODO(yhirano): Add an assertion that it returns true once the
    // graceful shutdown mechanism is introduced.
  }
}

DEFINE_TRACE(ForeignFetchEvent) {
  visitor->trace(m_observer);
  visitor->trace(m_request);
  ExtendableEvent::trace(visitor);
}

}  // namespace blink