Source/WebKit/WebProcess/Plugins/Netscape/JSNPMethod.cpp

/*
 * Copyright (C) 2010-2018 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 "JSNPMethod.h"

#if ENABLE(NETSCAPE_PLUGIN_API)

#include "JSNPObject.h"
#include <JavaScriptCore/Error.h>
#include <JavaScriptCore/FunctionPrototype.h>
#include <JavaScriptCore/IsoSubspacePerVM.h>
#include <JavaScriptCore/JSDestructibleObjectHeapCellType.h>
#include <JavaScriptCore/JSGlobalObjectInlines.h>
#include <JavaScriptCore/JSObject.h>
#include <WebCore/JSHTMLElement.h>
#include <WebCore/JSPluginElementFunctions.h>

namespace WebKit {
using namespace JSC;
using namespace WebCore;

STATIC_ASSERT_IS_TRIVIALLY_DESTRUCTIBLE(JSNPMethod);

const ClassInfo JSNPMethod::s_info = { "NPMethod", &InternalFunction::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(JSNPMethod) };

static EncodedJSValue JSC_HOST_CALL callMethod(JSGlobalObject*, CallFrame*);

JSNPMethod::JSNPMethod(JSGlobalObject* globalObject, Structure* structure, NPIdentifier npIdentifier)
    : InternalFunction(globalObject->vm(), structure, callMethod, nullptr)
    , m_npIdentifier(npIdentifier)
{
}

void JSNPMethod::finishCreation(VM& vm, const String& name)
{
    Base::finishCreation(vm, name);
    ASSERT(inherits(vm, info()));
}

IsoSubspace* JSNPMethod::subspaceForImpl(VM& vm)
{
    static NeverDestroyed<IsoSubspacePerVM> perVM([] (VM& vm) { return ISO_SUBSPACE_PARAMETERS(vm.destructibleObjectHeapCellType.get(), JSNPMethod); });
    return &perVM.get().forVM(vm);
}

static EncodedJSValue JSC_HOST_CALL callMethod(JSGlobalObject* globalObject, CallFrame* callFrame)
{
    VM& vm = globalObject->vm();
    auto scope = DECLARE_THROW_SCOPE(vm);

    JSNPMethod* jsNPMethod = jsCast<JSNPMethod*>(callFrame->jsCallee());

    JSValue thisValue = callFrame->thisValue();

    // Check if we're calling a method on the plug-in script object.
    if (thisValue.inherits<JSHTMLElement>(vm)) {
        JSHTMLElement* element = jsCast<JSHTMLElement*>(asObject(thisValue));

        // Try to get the script object from the element
        if (JSObject* scriptObject = pluginScriptObject(globalObject, element))
            thisValue = scriptObject;
    }

    if (thisValue.inherits<JSNPObject>(vm)) {
        JSNPObject* jsNPObject = jsCast<JSNPObject*>(asObject(thisValue));

        return JSValue::encode(jsNPObject->callMethod(globalObject, callFrame, jsNPMethod->npIdentifier()));
    }

    return throwVMTypeError(globalObject, scope);
}

} // namespace WebKit

#endif // ENABLE(NETSCAPE_PLUGIN_API)