Source/WebCore/bindings/js/JSDOMWindowProperties.cpp

/*
 * Copyright (C) 2016-2019 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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 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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#include "config.h"
#include "JSDOMWindowProperties.h"

#include "Frame.h"
#include "HTMLDocument.h"
#include "JSDOMBinding.h"
#include "JSDOMBindingSecurity.h"
#include "JSDOMConvertStrings.h"
#include "JSDOMWindowBase.h"
#include "JSElement.h"
#include "JSHTMLCollection.h"
#include "WebCoreJSClientData.h"

namespace WebCore {

using namespace JSC;

const ClassInfo JSDOMWindowProperties::s_info = { "WindowProperties", &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(JSDOMWindowProperties) };

// https://html.spec.whatwg.org/multipage/window-object.html#dom-window-nameditem
static bool jsDOMWindowPropertiesGetOwnPropertySlotNamedItemGetter(JSDOMWindowProperties* thisObject, DOMWindow& window, JSGlobalObject* lexicalGlobalObject, PropertyName propertyName, PropertySlot& slot)
{
    if (auto* frame = window.frame()) {
        if (auto* scopedChild = frame->tree().scopedChild(propertyNameToAtomString(propertyName))) {
            slot.setValue(thisObject, static_cast<unsigned>(PropertyAttribute::DontEnum), toJS(lexicalGlobalObject, scopedChild->document()->domWindow()));
            return true;
        }
    }

    if (!BindingSecurity::shouldAllowAccessToDOMWindow(lexicalGlobalObject, window, ThrowSecurityError))
        return false;

    // Allow shortcuts like 'Image1' instead of document.images.Image1
    auto* document = window.document();
    if (is<HTMLDocument>(document)) {
        auto& htmlDocument = downcast<HTMLDocument>(*document);
        auto* atomicPropertyName = propertyName.publicName();
        if (atomicPropertyName && htmlDocument.hasWindowNamedItem(*atomicPropertyName)) {
            JSValue namedItem;
            if (UNLIKELY(htmlDocument.windowNamedItemContainsMultipleElements(*atomicPropertyName))) {
                Ref<HTMLCollection> collection = document->windowNamedItems(atomicPropertyName);
                ASSERT(collection->length() > 1);
                namedItem = toJS(lexicalGlobalObject, thisObject->globalObject(), collection);
            } else
                namedItem = toJS(lexicalGlobalObject, thisObject->globalObject(), htmlDocument.windowNamedItem(*atomicPropertyName));
            slot.setValue(thisObject, static_cast<unsigned>(PropertyAttribute::DontEnum), namedItem);
            return true;
        }
    }

    return false;
}

void JSDOMWindowProperties::finishCreation(JSGlobalObject& globalObject)
{
    VM& vm = globalObject.vm();
    Base::finishCreation(vm);
    ASSERT(inherits(vm, info()));
    JSC_TO_STRING_TAG_WITHOUT_TRANSITION();
    JSObject::preventExtensions(this, &globalObject);
}

bool JSDOMWindowProperties::getOwnPropertySlot(JSObject* object, JSGlobalObject* lexicalGlobalObject, PropertyName propertyName, PropertySlot& slot)
{
    VM& vm = lexicalGlobalObject->vm();
    auto* thisObject = jsCast<JSDOMWindowProperties*>(object);
    ASSERT_GC_OBJECT_INHERITS(thisObject, info());

    if (Base::getOwnPropertySlot(thisObject, lexicalGlobalObject, propertyName, slot))
        return true;
    JSObject* proto = asObject(thisObject->getPrototypeDirect(vm));
    if (proto->hasProperty(lexicalGlobalObject, propertyName))
        return false;

    // FIXME: We should probably add support for JSRemoteDOMWindowBase too.
    auto* jsWindow = jsDynamicCast<JSDOMWindowBase*>(vm, thisObject->globalObject());
    if (!jsWindow)
        return false;

    auto& window = jsWindow->wrapped();
    return jsDOMWindowPropertiesGetOwnPropertySlotNamedItemGetter(thisObject, window, lexicalGlobalObject, propertyName, slot);
}

bool JSDOMWindowProperties::getOwnPropertySlotByIndex(JSObject* object, JSGlobalObject* lexicalGlobalObject, unsigned index, PropertySlot& slot)
{
    VM& vm = lexicalGlobalObject->vm();
    return getOwnPropertySlot(object, lexicalGlobalObject, Identifier::from(vm, index), slot);
}

bool JSDOMWindowProperties::deleteProperty(JSCell*, JSGlobalObject*, PropertyName, DeletePropertySlot&)
{
    return false;
}

bool JSDOMWindowProperties::deletePropertyByIndex(JSCell*, JSGlobalObject*, unsigned)
{
    return false;
}

bool JSDOMWindowProperties::preventExtensions(JSObject*, JSGlobalObject*)
{
    return false;
}

bool JSDOMWindowProperties::isExtensible(JSObject*, JSGlobalObject*)
{
    return true;
}

bool JSDOMWindowProperties::defineOwnProperty(JSObject*, JSGlobalObject* lexicalGlobalObject, PropertyName, const PropertyDescriptor&, bool shouldThrow)
{
    auto scope = DECLARE_THROW_SCOPE(lexicalGlobalObject->vm());
    return typeError(lexicalGlobalObject, scope, shouldThrow, "Defining a property on a WindowProperties object is not allowed."_s);
}

JSC::IsoSubspace* JSDOMWindowProperties::subspaceForImpl(JSC::VM& vm)
{
    return &static_cast<JSVMClientData*>(vm.clientData)->domWindowPropertiesSpace();
}

} // namespace WebCore