third_party/WebKit/Source/bindings/core/v8/custom/V8CustomEventCustom.cpp

/*
 * Copyright (C) 2012 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
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 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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#include "bindings/core/v8/V8CustomEvent.h"

#include "bindings/core/v8/Dictionary.h"
#include "bindings/core/v8/ScriptState.h"
#include "bindings/core/v8/SerializedScriptValue.h"
#include "bindings/core/v8/SerializedScriptValueFactory.h"
#include "bindings/core/v8/V8Binding.h"
#include "bindings/core/v8/V8CustomEventInit.h"
#include "bindings/core/v8/V8DOMWrapper.h"
#include "bindings/core/v8/V8Event.h"
#include "bindings/core/v8/V8PrivateProperty.h"
#include "core/dom/ContextFeatures.h"
#include "platform/RuntimeEnabledFeatures.h"

namespace blink {

static void storeDetail(ScriptState* scriptState,
                        CustomEvent* impl,
                        v8::Local<v8::Object> wrapper,
                        v8::Local<v8::Value> detail) {
  auto privateDetail =
      V8PrivateProperty::getCustomEventDetail(scriptState->isolate());
  privateDetail.set(scriptState->context(), wrapper, detail);

  // When a custom event is created in an isolated world, serialize
  // |detail| and store it in |impl| so that we can clone |detail|
  // when the getter of |detail| is called in the main world later.
  if (scriptState->world().isIsolatedWorld())
    impl->setSerializedDetail(
        SerializedScriptValue::serializeAndSwallowExceptions(
            scriptState->isolate(), detail));
}

void V8CustomEvent::constructorCustom(
    const v8::FunctionCallbackInfo<v8::Value>& info) {
  ExceptionState exceptionState(ExceptionState::ConstructionContext,
                                "CustomEvent", info.Holder(),
                                info.GetIsolate());
  if (UNLIKELY(info.Length() < 1)) {
    exceptionState.throwTypeError(
        ExceptionMessages::notEnoughArguments(1, info.Length()));
    return;
  }

  V8StringResource<> type = info[0];
  if (!type.prepare())
    return;

  CustomEventInit eventInitDict;
  if (!isUndefinedOrNull(info[1])) {
    if (!info[1]->IsObject()) {
      exceptionState.throwTypeError(
          "parameter 2 ('eventInitDict') is not an object.");
      return;
    }
    V8CustomEventInit::toImpl(info.GetIsolate(), info[1], eventInitDict,
                              exceptionState);
    if (exceptionState.hadException())
      return;
  }

  CustomEvent* impl = CustomEvent::create(type, eventInitDict);
  v8::Local<v8::Object> wrapper = info.Holder();
  wrapper = impl->associateWithWrapper(
      info.GetIsolate(), &V8CustomEvent::wrapperTypeInfo, wrapper);

  // TODO(bashi): Workaround for http://crbug.com/529941. We need to store
  // |detail| as a private property to avoid cycle references.
  if (eventInitDict.hasDetail()) {
    v8::Local<v8::Value> v8Detail = eventInitDict.detail().v8Value();
    storeDetail(ScriptState::current(info.GetIsolate()), impl, wrapper,
                v8Detail);
  }
  v8SetReturnValue(info, wrapper);
}

void V8CustomEvent::initCustomEventMethodEpilogueCustom(
    const v8::FunctionCallbackInfo<v8::Value>& info,
    CustomEvent* impl) {
  ASSERT(info.Length() >= 3);
  v8::Local<v8::Value> detail = info[3];
  if (!detail.IsEmpty())
    storeDetail(ScriptState::current(info.GetIsolate()), impl, info.Holder(),
                detail);
}

void V8CustomEvent::detailAttributeGetterCustom(
    const v8::FunctionCallbackInfo<v8::Value>& info) {
  CustomEvent* event = V8CustomEvent::toImpl(info.Holder());
  ScriptState* scriptState = ScriptState::current(info.GetIsolate());

  auto privateDetail =
      V8PrivateProperty::getCustomEventDetail(info.GetIsolate());
  v8::Local<v8::Value> detail =
      privateDetail.get(scriptState->context(), info.Holder());
  if (!detail.IsEmpty()) {
    v8SetReturnValue(info, detail);
    return;
  }

  // Be careful not to return a V8 value which is created in different world.
  if (SerializedScriptValue* serializedValue = event->serializedDetail()) {
    detail = serializedValue->deserialize();
  } else if (scriptState->world().isIsolatedWorld()) {
    v8::Local<v8::Value> mainWorldDetail =
        privateDetail.getFromMainWorld(scriptState, event);
    if (!mainWorldDetail.IsEmpty()) {
      event->setSerializedDetail(
          SerializedScriptValue::serializeAndSwallowExceptions(
              info.GetIsolate(), mainWorldDetail));
      detail = event->serializedDetail()->deserialize();
    }
  }

  // |detail| should be null when it is an empty handle because its default
  // value is null.
  if (detail.IsEmpty())
    detail = v8::Null(info.GetIsolate());
  privateDetail.set(scriptState->context(), info.Holder(), detail);
  v8SetReturnValue(info, detail);
}

}  // namespace blink