JSMessageEventCustom.cpp   [plain text]

/*
 * Copyright (C) 2009 Google Inc. All rights reserved.
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 * modification, are permitted provided that the following conditions are
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 * in the documentation and/or other materials provided with the
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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
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#include "config.h"
#include "JSMessageEvent.h"

#include "JSBlob.h"
#include "JSDOMBinding.h"
#include "JSDOMConvert.h"
#include "JSDOMWindow.h"
#include "JSEventTarget.h"
#include "JSMessagePort.h"
#include "MessageEvent.h"
#include <runtime/JSArray.h>
#include <runtime/JSArrayBuffer.h>

using namespace JSC;

namespace WebCore {

JSValue JSMessageEvent::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 (!cachedValue.isObject() || &worldForDOMObject(cachedValue.getObject()) == &currentWorld(&state))
            return cachedValue;
        ASSERT_NOT_REACHED();
    }

    MessageEvent& event = wrapped();
    JSValue result;
    switch (event.dataType()) {
    case MessageEvent::DataTypeScriptValue: {
        JSValue dataValue = event.dataAsScriptValue();
        if (!dataValue)
            result = jsNull();
        else {
            // We need to make sure MessageEvents do not leak objects in their state property across isolated DOM worlds.
            // Ideally, we would check that the worlds have different privileges but that's not possible yet.
            if (dataValue.isObject() && &worldForDOMObject(dataValue.getObject()) != &currentWorld(&state)) {
                RefPtr<SerializedScriptValue> serializedValue = event.trySerializeData(&state);
                if (serializedValue)
                    result = serializedValue->deserialize(state, globalObject());
                else
                    result = jsNull();
            } else
                result = dataValue;
        }
        break;
    }

    case MessageEvent::DataTypeSerializedScriptValue:
        if (RefPtr<SerializedScriptValue> serializedValue = event.dataAsSerializedScriptValue()) {
            Vector<RefPtr<MessagePort>> ports = wrapped().ports();
            // FIXME: Why does this suppress exceptions?
            result = serializedValue->deserialize(state, globalObject(), ports, SerializationErrorMode::NonThrowing);
        } else
            result = jsNull();
        break;

    case MessageEvent::DataTypeString:
        result = jsStringWithCache(&state, event.dataAsString());
        break;

    case MessageEvent::DataTypeBlob:
        result = toJS(&state, globalObject(), event.dataAsBlob());
        break;

    case MessageEvent::DataTypeArrayBuffer:
        result = toJS(&state, globalObject(), event.dataAsArrayBuffer());
        break;
    }

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

static JSC::JSValue handleInitMessageEvent(JSMessageEvent* jsEvent, JSC::ExecState& state)
{
    VM& vm = state.vm();
    auto scope = DECLARE_THROW_SCOPE(vm);

    const String& typeArg = state.argument(0).toWTFString(&state);
    RETURN_IF_EXCEPTION(scope, JSValue());

    bool canBubbleArg = state.argument(1).toBoolean(&state);
    RETURN_IF_EXCEPTION(scope, JSValue());

    bool cancelableArg = state.argument(2).toBoolean(&state);
    RETURN_IF_EXCEPTION(scope, JSValue());

    JSValue dataArg = state.argument(3);

    const String originArg = convert<IDLUSVString>(state, state.argument(4));
    RETURN_IF_EXCEPTION(scope, JSValue());

    const String lastEventIdArg = state.argument(5).toWTFString(&state);
    RETURN_IF_EXCEPTION(scope, JSValue());

    auto sourceArg = convert<IDLNullable<IDLUnion<IDLInterface<DOMWindow>, IDLInterface<MessagePort>>>>(state, state.argument(6));
    RETURN_IF_EXCEPTION(scope, JSValue());
    
    Vector<RefPtr<MessagePort>> messagePorts;
    if (!state.argument(7).isUndefinedOrNull()) {
        messagePorts = convert<IDLSequence<IDLInterface<MessagePort>>>(state, state.argument(7));
        RETURN_IF_EXCEPTION(scope, JSValue());
    }

    MessageEvent& event = jsEvent->wrapped();
    event.initMessageEvent(state, typeArg, canBubbleArg, cancelableArg, dataArg, originArg, lastEventIdArg, WTFMove(sourceArg), WTFMove(messagePorts));
    jsEvent->m_data.set(vm, jsEvent, dataArg);
    return jsUndefined();
}

JSC::JSValue JSMessageEvent::initMessageEvent(JSC::ExecState& state)
{
    return handleInitMessageEvent(this, state);
}

JSC::JSValue JSMessageEvent::webkitInitMessageEvent(JSC::ExecState& state)
{
    return handleInitMessageEvent(this, state);
}

} // namespace WebCore