Source/WebCore/page/UserMessageHandler.cpp

/*
 * Copyright (C) 2014 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
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "config.h"
#include "UserMessageHandler.h"

#if ENABLE(USER_MESSAGE_HANDLERS)

#include "Frame.h"
#include "JSDOMPromiseDeferred.h"
#include "SerializedScriptValue.h"
#include <JavaScriptCore/JSCJSValue.h>

namespace WebCore {

UserMessageHandler::UserMessageHandler(Frame& frame, UserMessageHandlerDescriptor& descriptor)
    : FrameDestructionObserver(&frame)
    , m_descriptor(&descriptor)
{
}

UserMessageHandler::~UserMessageHandler() = default;

ExceptionOr<void> UserMessageHandler::postMessage(RefPtr<SerializedScriptValue>&& value, Ref<DeferredPromise>&& promise)
{
    // Check to see if the descriptor has been removed. This can happen if the host application has
    // removed the named message handler at the WebKit2 API level.
    if (!m_descriptor) {
        promise->reject(Exception { InvalidAccessError });
        return Exception { InvalidAccessError };
    }

    m_descriptor->didPostMessage(*this, value.get(), [promise = WTFMove(promise)](SerializedScriptValue* result, const String& errorMessage) {
        auto* globalObject = promise->globalObject();
        if (!globalObject)
            return;

        if (!errorMessage.isNull()) {
            JSC::JSLockHolder lock(globalObject);
            promise->reject<IDLAny>(JSC::createError(globalObject, errorMessage));
            return;
        }

        ASSERT(result);
        promise->resolve<IDLAny>(result->deserialize(*globalObject, globalObject));
    });
    return { };
}

} // namespace WebCore

#endif // ENABLE(USER_MESSAGE_HANDLERS)