Source/WebCore/bindings/js/JSExtendableMessageEventCustom.cpp

/*
 * Copyright (C) 2017 Apple 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:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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 */

#include "config.h"

#if ENABLE(SERVICE_WORKER)
#include "JSExtendableMessageEvent.h"

#include "JSDOMConstructor.h"
#include "JSDOMConvertStrings.h"

namespace WebCore {

using namespace JSC;

JSC::EncodedJSValue constructJSExtendableMessageEvent(JSC::ExecState& state)
{
    VM& vm = state.vm();
    auto throwScope = DECLARE_THROW_SCOPE(vm);
    UNUSED_PARAM(throwScope);

    auto* jsConstructor = jsCast<JSDOMConstructorBase*>(state.jsCallee());
    ASSERT(jsConstructor);
    if (UNLIKELY(state.argumentCount() < 1))
        return throwVMError(&state, throwScope, createNotEnoughArgumentsError(&state));
    auto type = convert<IDLDOMString>(state, state.uncheckedArgument(0));
    RETURN_IF_EXCEPTION(throwScope, encodedJSValue());
    auto eventInitDict = convert<IDLDictionary<ExtendableMessageEvent::Init>>(state, state.argument(1));
    RETURN_IF_EXCEPTION(throwScope, encodedJSValue());

    JSValue data = eventInitDict.data;
    auto object = ExtendableMessageEvent::create(state, WTFMove(type), WTFMove(eventInitDict));
    RETURN_IF_EXCEPTION(throwScope, encodedJSValue());

    JSValue wrapper = toJSNewlyCreated<IDLInterface<ExtendableMessageEvent>>(state, *jsConstructor->globalObject(), WTFMove(object));

    // Cache the JSValue passed in for data parameter in the wrapper so the getter returns the exact value
    // it was initialized too. We do not store the JSValue in the implementation object to avoid leaks.
    auto* jsMessageEvent = jsCast<JSExtendableMessageEvent*>(wrapper);
    jsMessageEvent->m_data.set(state.vm(), jsMessageEvent, data);

    return JSValue::encode(wrapper);
}

JSValue JSExtendableMessageEvent::data(ExecState& state) const
{
    if (JSValue cachedValue = m_data.get()) {
        // We cannot use a cached object if we are in a different world than the one it was created in.
        if (isWorldCompatible(state, cachedValue))
            return cachedValue;
        ASSERT_NOT_REACHED();
    }

    auto& event = wrapped();
    JSValue result;
    if (auto* serializedValue = event.data())
        result = serializedValue->deserialize(state, globalObject(), event.ports(), SerializationErrorMode::NonThrowing);
    else
        result = jsNull();

    // Save the result so we don't have to deserialize the value again.
    m_data.set(state.vm(), this, result);
    return result;
}

}

#endif // ENABLE(SERVICE_WORKER)