/*
 * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
 *           (C) 1999 Antti Koivisto (koivisto@kde.org)
 *           (C) 2000 Simon Hausmann (hausmann@kde.org)
 *           (C) 2001 Dirk Mueller (mueller@kde.org)
 * Copyright (C) 2004-2019 Apple Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */

#include "config.h"
#include "HTMLFrameElementBase.h"

#include "Document.h"
#include "ElementInlines.h"
#include "FocusController.h"
#include "Frame.h"
#include "FrameLoader.h"
#include "FrameView.h"
#include "HTMLNames.h"
#include "HTMLParserIdioms.h"
#include "JSDOMBindingSecurity.h"
#include "Page.h"
#include "RenderWidget.h"
#include "ScriptController.h"
#include "Settings.h"
#include "SubframeLoader.h"
#include <wtf/IsoMallocInlines.h>
#include <wtf/URL.h>

namespace WebCore {

WTF_MAKE_ISO_ALLOCATED_IMPL(HTMLFrameElementBase);

using namespace HTMLNames;

HTMLFrameElementBase::HTMLFrameElementBase(const QualifiedName& tagName, Document& document)
    : HTMLFrameOwnerElement(tagName, document)
{
    setHasCustomStyleResolveCallbacks();
}

bool HTMLFrameElementBase::canLoadScriptURL(const URL& scriptURL) const
{
    return canLoadURL(scriptURL);
}

bool HTMLFrameElementBase::canLoad() const
{
    // FIXME: Why is it valuable to return true when m_frameURL is empty?
    // FIXME: After openURL replaces an empty URL with the blank URL, this may no longer necessarily return true.
    return m_frameURL.isEmpty() || canLoadURL(m_frameURL);
}

bool HTMLFrameElementBase::canLoadURL(const String& relativeURL) const
{
    return canLoadURL(document().completeURL(relativeURL));
}

// Note that unlike HTMLPlugInImageElement::canLoadURL this uses ScriptController::canAccessFromCurrentOrigin.
bool HTMLFrameElementBase::canLoadURL(const URL& completeURL) const
{
    if (completeURL.protocolIsJavaScript()) {
        RefPtr<Document> contentDocument = this->contentDocument();
        if (contentDocument && !ScriptController::canAccessFromCurrentOrigin(contentDocument->frame(), document()))
            return false;
    }

    return !isProhibitedSelfReference(completeURL);
}

void HTMLFrameElementBase::openURL(LockHistory lockHistory, LockBackForwardList lockBackForwardList)
{
    if (!canLoad())
        return;

    if (m_frameURL.isEmpty())
        m_frameURL = aboutBlankURL().string();

    if (shouldLoadFrameLazily())
        return;

    RefPtr<Frame> parentFrame = document().frame();
    if (!parentFrame)
        return;

    document().willLoadFrameElement(document().completeURL(m_frameURL));

    String frameName = getNameAttribute();
    if (frameName.isNull() && UNLIKELY(document().settings().needsFrameNameFallbackToIdQuirk()))
        frameName = getIdAttribute();

    parentFrame->loader().subframeLoader().requestFrame(*this, m_frameURL, frameName, lockHistory, lockBackForwardList);
}

void HTMLFrameElementBase::parseAttribute(const QualifiedName& name, const AtomString& value)
{
    if (name == srcdocAttr) {
        if (value.isNull()) {
            const AtomString& srcValue = attributeWithoutSynchronization(srcAttr);
            if (!srcValue.isNull())
                setLocation(stripLeadingAndTrailingHTMLSpaces(srcValue));
        } else
            setLocation("about:srcdoc");
    } else if (name == srcAttr && !hasAttributeWithoutSynchronization(srcdocAttr))
        setLocation(stripLeadingAndTrailingHTMLSpaces(value));
    else
        HTMLFrameOwnerElement::parseAttribute(name, value);
}

Node::InsertedIntoAncestorResult HTMLFrameElementBase::insertedIntoAncestor(InsertionType insertionType, ContainerNode& parentOfInsertedTree)
{
    HTMLFrameOwnerElement::insertedIntoAncestor(insertionType, parentOfInsertedTree);
    if (insertionType.connectedToDocument)
        return InsertedIntoAncestorResult::NeedsPostInsertionCallback;
    return InsertedIntoAncestorResult::Done;
}

void HTMLFrameElementBase::didFinishInsertingNode()
{
    if (!isConnected())
        return;

    // DocumentFragments don't kick off any loads.
    if (!document().frame())
        return;

    if (!SubframeLoadingDisabler::canLoadFrame(*this))
        return;

    if (!renderer())
        invalidateStyleAndRenderersForSubtree();
    openURL();
}

void HTMLFrameElementBase::didAttachRenderers()
{
    if (RenderWidget* part = renderWidget()) {
        if (RefPtr<Frame> frame = contentFrame())
            part->setWidget(frame->view());
    }
}

URL HTMLFrameElementBase::location() const
{
    if (hasAttributeWithoutSynchronization(srcdocAttr))
        return aboutSrcDocURL();
    return document().completeURL(attributeWithoutSynchronization(srcAttr));
}

void HTMLFrameElementBase::setLocation(const String& str)
{
    if (document().settings().needsAcrobatFrameReloadingQuirk() && m_frameURL == str)
        return;

    m_frameURL = AtomString(str);

    if (isConnected())
        openURL(LockHistory::No, LockBackForwardList::No);
}

void HTMLFrameElementBase::setLocation(JSC::JSGlobalObject& state, const String& newLocation)
{
    if (WTF::protocolIsJavaScript(stripLeadingAndTrailingHTMLSpaces(newLocation))) {
        if (!BindingSecurity::shouldAllowAccessToNode(state, contentDocument()))
            return;
    }

    setLocation(newLocation);
}

bool HTMLFrameElementBase::supportsFocus() const
{
    return true;
}

void HTMLFrameElementBase::setFocus(bool received, FocusVisibility visibility)
{
    HTMLFrameOwnerElement::setFocus(received, visibility);
    if (Page* page = document().page()) {
        CheckedRef focusController { page->focusController() };
        if (received)
            focusController->setFocusedFrame(contentFrame());
        else if (focusController->focusedFrame() == contentFrame()) // Focus may have already been given to another frame, don't take it away.
            focusController->setFocusedFrame(nullptr);
    }
}

bool HTMLFrameElementBase::isURLAttribute(const Attribute& attribute) const
{
    return attribute.name() == srcAttr || attribute.name() == longdescAttr || HTMLFrameOwnerElement::isURLAttribute(attribute);
}

bool HTMLFrameElementBase::isHTMLContentAttribute(const Attribute& attribute) const
{
    return attribute.name() == srcdocAttr || HTMLFrameOwnerElement::isHTMLContentAttribute(attribute);
}

int HTMLFrameElementBase::width()
{
    document().updateLayoutIgnorePendingStylesheets();
    if (!renderBox())
        return 0;
    return renderBox()->width();
}

int HTMLFrameElementBase::height()
{
    document().updateLayoutIgnorePendingStylesheets();
    if (!renderBox())
        return 0;
    return renderBox()->height();
}

ScrollbarMode HTMLFrameElementBase::scrollingMode() const
{
    auto scrollingAttribute = attributeWithoutSynchronization(scrollingAttr);
    return equalLettersIgnoringASCIICase(scrollingAttribute, "no")
        || equalLettersIgnoringASCIICase(scrollingAttribute, "noscroll")
        || equalLettersIgnoringASCIICase(scrollingAttribute, "off")
        ? ScrollbarAlwaysOff : ScrollbarAuto;
}

} // namespace WebCore