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/*
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 1999 Antti Koivisto (koivisto@kde.org)
* (C) 2000 Simon Hausmann <hausmann@kde.org>
* Copyright (C) 2003, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
* (C) 2006 Graham Dennis (graham.dennis@gmail.com)
*
* 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 "core/html/HTMLAnchorElement.h"
#include "core/dom/Attribute.h"
#include "core/editing/FrameSelection.h"
#include "core/events/KeyboardEvent.h"
#include "core/events/MouseEvent.h"
#include "core/frame/FrameHost.h"
#include "core/frame/LocalFrame.h"
#include "core/frame/Settings.h"
#include "core/frame/UseCounter.h"
#include "core/html/HTMLFormElement.h"
#include "core/html/HTMLImageElement.h"
#include "core/html/parser/HTMLParserIdioms.h"
#include "core/loader/FrameLoadRequest.h"
#include "core/loader/FrameLoader.h"
#include "core/loader/FrameLoaderClient.h"
#include "core/loader/FrameLoaderTypes.h"
#include "core/loader/PingLoader.h"
#include "core/page/Chrome.h"
#include "core/page/ChromeClient.h"
#include "core/rendering/RenderImage.h"
#include "platform/PlatformMouseEvent.h"
#include "platform/network/DNS.h"
#include "platform/network/ResourceRequest.h"
#include "platform/weborigin/KnownPorts.h"
#include "platform/weborigin/SecurityOrigin.h"
#include "platform/weborigin/SecurityPolicy.h"
#include "public/platform/Platform.h"
#include "public/platform/WebPrescientNetworking.h"
#include "public/platform/WebURL.h"
#include "wtf/text/StringBuilder.h"
namespace WebCore {
namespace {
void preconnectToURL(const KURL& url, blink::WebPreconnectMotivation motivation)
{
blink::WebPrescientNetworking* prescientNetworking = blink::Platform::current()->prescientNetworking();
if (!prescientNetworking)
return;
prescientNetworking->preconnect(url, motivation);
}
}
class HTMLAnchorElement::PrefetchEventHandler FINAL : public NoBaseWillBeGarbageCollected<HTMLAnchorElement::PrefetchEventHandler> {
public:
static PassOwnPtrWillBeRawPtr<PrefetchEventHandler> create(HTMLAnchorElement* anchorElement)
{
return adoptPtrWillBeNoop(new HTMLAnchorElement::PrefetchEventHandler(anchorElement));
}
void reset();
void handleEvent(Event* e);
void didChangeHREF() { m_hadHREFChanged = true; }
bool hasIssuedPreconnect() const { return m_hasIssuedPreconnect; }
void trace(Visitor* visitor) { visitor->trace(m_anchorElement); }
private:
explicit PrefetchEventHandler(HTMLAnchorElement*);
void handleMouseOver(Event* event);
void handleMouseOut(Event* event);
void handleLeftMouseDown(Event* event);
void handleGestureTapUnconfirmed(Event*);
void handleGestureShowPress(Event*);
void handleClick(Event* event);
bool shouldPrefetch(const KURL&);
void prefetch(blink::WebPreconnectMotivation);
RawPtrWillBeMember<HTMLAnchorElement> m_anchorElement;
double m_mouseOverTimestamp;
double m_mouseDownTimestamp;
double m_tapDownTimestamp;
bool m_hadHREFChanged;
bool m_hadTapUnconfirmed;
bool m_hasIssuedPreconnect;
};
using namespace HTMLNames;
HTMLAnchorElement::HTMLAnchorElement(const QualifiedName& tagName, Document& document)
: HTMLElement(tagName, document)
, m_linkRelations(0)
, m_cachedVisitedLinkHash(0)
{
ScriptWrappable::init(this);
}
PassRefPtrWillBeRawPtr<HTMLAnchorElement> HTMLAnchorElement::create(Document& document)
{
return adoptRefWillBeNoop(new HTMLAnchorElement(aTag, document));
}
HTMLAnchorElement::~HTMLAnchorElement()
{
}
bool HTMLAnchorElement::supportsFocus() const
{
if (rendererIsEditable())
return HTMLElement::supportsFocus();
// If not a link we should still be able to focus the element if it has tabIndex.
return isLink() || HTMLElement::supportsFocus();
}
bool HTMLAnchorElement::isMouseFocusable() const
{
// Links are focusable by default, but only allow links with tabindex or contenteditable to be mouse focusable.
// https://bugs.webkit.org/show_bug.cgi?id=26856
if (isLink())
return HTMLElement::supportsFocus();
return HTMLElement::isMouseFocusable();
}
bool HTMLAnchorElement::isKeyboardFocusable() const
{
ASSERT(document().isActive());
if (isFocusable() && Element::supportsFocus())
return HTMLElement::isKeyboardFocusable();
if (isLink() && !document().frameHost()->chrome().client().tabsToLinks())
return false;
return HTMLElement::isKeyboardFocusable();
}
static void appendServerMapMousePosition(StringBuilder& url, Event* event)
{
if (!event->isMouseEvent())
return;
ASSERT(event->target());
Node* target = event->target()->toNode();
ASSERT(target);
if (!isHTMLImageElement(*target))
return;
HTMLImageElement& imageElement = toHTMLImageElement(*target);
if (!imageElement.isServerMap())
return;
if (!imageElement.renderer() || !imageElement.renderer()->isRenderImage())
return;
RenderImage* renderer = toRenderImage(imageElement.renderer());
// FIXME: This should probably pass true for useTransforms.
FloatPoint absolutePosition = renderer->absoluteToLocal(FloatPoint(toMouseEvent(event)->pageX(), toMouseEvent(event)->pageY()));
int x = absolutePosition.x();
int y = absolutePosition.y();
url.append('?');
url.appendNumber(x);
url.append(',');
url.appendNumber(y);
}
void HTMLAnchorElement::defaultEventHandler(Event* event)
{
if (isLink()) {
if (focused() && isEnterKeyKeydownEvent(event) && isLiveLink()) {
event->setDefaultHandled();
dispatchSimulatedClick(event);
return;
}
prefetchEventHandler()->handleEvent(event);
if (isLinkClick(event) && isLiveLink()) {
handleClick(event);
prefetchEventHandler()->reset();
return;
}
}
HTMLElement::defaultEventHandler(event);
}
void HTMLAnchorElement::setActive(bool down)
{
if (rendererIsEditable())
return;
ContainerNode::setActive(down);
}
void HTMLAnchorElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
{
if (name == hrefAttr) {
bool wasLink = isLink();
setIsLink(!value.isNull());
if (wasLink != isLink()) {
didAffectSelector(AffectedSelectorLink | AffectedSelectorVisited | AffectedSelectorEnabled);
if (wasLink && treeScope().adjustedFocusedElement() == this) {
// We might want to call blur(), but it's dangerous to dispatch
// events here.
document().setNeedsFocusedElementCheck();
}
}
if (isLink()) {
String parsedURL = stripLeadingAndTrailingHTMLSpaces(value);
if (document().isDNSPrefetchEnabled()) {
if (protocolIs(parsedURL, "http") || protocolIs(parsedURL, "https") || parsedURL.startsWith("//"))
prefetchDNS(document().completeURL(parsedURL).host());
}
if (wasLink)
prefetchEventHandler()->didChangeHREF();
}
invalidateCachedVisitedLinkHash();
} else if (name == nameAttr || name == titleAttr) {
// Do nothing.
} else if (name == relAttr)
setRel(value);
else
HTMLElement::parseAttribute(name, value);
}
void HTMLAnchorElement::accessKeyAction(bool sendMouseEvents)
{
dispatchSimulatedClick(0, sendMouseEvents ? SendMouseUpDownEvents : SendNoEvents);
}
bool HTMLAnchorElement::isURLAttribute(const Attribute& attribute) const
{
return attribute.name().localName() == hrefAttr || HTMLElement::isURLAttribute(attribute);
}
bool HTMLAnchorElement::hasLegalLinkAttribute(const QualifiedName& name) const
{
return name == hrefAttr || HTMLElement::hasLegalLinkAttribute(name);
}
bool HTMLAnchorElement::canStartSelection() const
{
if (!isLink())
return HTMLElement::canStartSelection();
return rendererIsEditable();
}
bool HTMLAnchorElement::draggable() const
{
// Should be draggable if we have an href attribute.
const AtomicString& value = getAttribute(draggableAttr);
if (equalIgnoringCase(value, "true"))
return true;
if (equalIgnoringCase(value, "false"))
return false;
return hasAttribute(hrefAttr);
}
KURL HTMLAnchorElement::href() const
{
return document().completeURL(stripLeadingAndTrailingHTMLSpaces(getAttribute(hrefAttr)));
}
void HTMLAnchorElement::setHref(const AtomicString& value)
{
setAttribute(hrefAttr, value);
}
KURL HTMLAnchorElement::url() const
{
return href();
}
void HTMLAnchorElement::setURL(const KURL& url)
{
setHref(AtomicString(url.string()));
}
String HTMLAnchorElement::input() const
{
return getAttribute(hrefAttr);
}
void HTMLAnchorElement::setInput(const String& value)
{
setHref(AtomicString(value));
}
bool HTMLAnchorElement::hasRel(uint32_t relation) const
{
return m_linkRelations & relation;
}
void HTMLAnchorElement::setRel(const AtomicString& value)
{
m_linkRelations = 0;
SpaceSplitString newLinkRelations(value, true);
// FIXME: Add link relations as they are implemented
if (newLinkRelations.contains("noreferrer"))
m_linkRelations |= RelationNoReferrer;
}
const AtomicString& HTMLAnchorElement::name() const
{
return getNameAttribute();
}
short HTMLAnchorElement::tabIndex() const
{
// Skip the supportsFocus check in HTMLElement.
return Element::tabIndex();
}
AtomicString HTMLAnchorElement::target() const
{
return getAttribute(targetAttr);
}
bool HTMLAnchorElement::isLiveLink() const
{
return isLink() && !rendererIsEditable();
}
void HTMLAnchorElement::sendPings(const KURL& destinationURL)
{
const AtomicString& pingValue = getAttribute(pingAttr);
if (pingValue.isNull() || !document().settings() || !document().settings()->hyperlinkAuditingEnabled())
return;
UseCounter::count(document(), UseCounter::HTMLAnchorElementPingAttribute);
SpaceSplitString pingURLs(pingValue, false);
for (unsigned i = 0; i < pingURLs.size(); i++)
PingLoader::sendLinkAuditPing(document().frame(), document().completeURL(pingURLs[i]), destinationURL);
}
void HTMLAnchorElement::handleClick(Event* event)
{
event->setDefaultHandled();
LocalFrame* frame = document().frame();
if (!frame)
return;
StringBuilder url;
url.append(stripLeadingAndTrailingHTMLSpaces(fastGetAttribute(hrefAttr)));
appendServerMapMousePosition(url, event);
KURL completedURL = document().completeURL(url.toString());
// Schedule the ping before the frame load. Prerender in Chrome may kill the renderer as soon as the navigation is
// sent out.
sendPings(completedURL);
ResourceRequest request(completedURL);
if (prefetchEventHandler()->hasIssuedPreconnect())
frame->loader().client()->dispatchWillRequestAfterPreconnect(request);
if (hasAttribute(downloadAttr)) {
if (!hasRel(RelationNoReferrer)) {
String referrer = SecurityPolicy::generateReferrerHeader(document().referrerPolicy(), completedURL, document().outgoingReferrer());
if (!referrer.isEmpty())
request.setHTTPReferrer(Referrer(referrer, document().referrerPolicy()));
}
bool isSameOrigin = completedURL.protocolIsData() || document().securityOrigin()->canRequest(completedURL);
const AtomicString& suggestedName = (isSameOrigin ? fastGetAttribute(downloadAttr) : nullAtom);
frame->loader().client()->loadURLExternally(request, NavigationPolicyDownload, suggestedName);
} else {
FrameLoadRequest frameRequest(&document(), request, target());
frameRequest.setTriggeringEvent(event);
if (hasRel(RelationNoReferrer))
frameRequest.setShouldSendReferrer(NeverSendReferrer);
frame->loader().load(frameRequest);
}
}
bool isEnterKeyKeydownEvent(Event* event)
{
return event->type() == EventTypeNames::keydown && event->isKeyboardEvent() && toKeyboardEvent(event)->keyIdentifier() == "Enter";
}
bool isLinkClick(Event* event)
{
return event->type() == EventTypeNames::click && (!event->isMouseEvent() || toMouseEvent(event)->button() != RightButton);
}
bool HTMLAnchorElement::willRespondToMouseClickEvents()
{
return isLink() || HTMLElement::willRespondToMouseClickEvents();
}
HTMLAnchorElement::PrefetchEventHandler* HTMLAnchorElement::prefetchEventHandler()
{
if (!m_prefetchEventHandler)
m_prefetchEventHandler = PrefetchEventHandler::create(this);
return m_prefetchEventHandler.get();
}
HTMLAnchorElement::PrefetchEventHandler::PrefetchEventHandler(HTMLAnchorElement* anchorElement)
: m_anchorElement(anchorElement)
{
ASSERT(m_anchorElement);
reset();
}
void HTMLAnchorElement::PrefetchEventHandler::reset()
{
m_hadHREFChanged = false;
m_mouseOverTimestamp = 0;
m_mouseDownTimestamp = 0;
m_hadTapUnconfirmed = false;
m_tapDownTimestamp = 0;
m_hasIssuedPreconnect = false;
}
void HTMLAnchorElement::PrefetchEventHandler::handleEvent(Event* event)
{
if (!shouldPrefetch(m_anchorElement->href()))
return;
if (event->type() == EventTypeNames::mouseover)
handleMouseOver(event);
else if (event->type() == EventTypeNames::mouseout)
handleMouseOut(event);
else if (event->type() == EventTypeNames::mousedown && event->isMouseEvent() && toMouseEvent(event)->button() == LeftButton)
handleLeftMouseDown(event);
else if (event->type() == EventTypeNames::gestureshowpress)
handleGestureShowPress(event);
else if (event->type() == EventTypeNames::gesturetapunconfirmed)
handleGestureTapUnconfirmed(event);
else if (isLinkClick(event))
handleClick(event);
}
void HTMLAnchorElement::PrefetchEventHandler::handleMouseOver(Event* event)
{
if (m_mouseOverTimestamp == 0.0) {
m_mouseOverTimestamp = event->timeStamp();
blink::Platform::current()->histogramEnumeration("MouseEventPrefetch.MouseOvers", 0, 2);
prefetch(blink::WebPreconnectMotivationLinkMouseOver);
}
}
void HTMLAnchorElement::PrefetchEventHandler::handleMouseOut(Event* event)
{
if (m_mouseOverTimestamp > 0.0) {
double mouseOverDuration = convertDOMTimeStampToSeconds(event->timeStamp() - m_mouseOverTimestamp);
blink::Platform::current()->histogramCustomCounts("MouseEventPrefetch.MouseOverDuration_NoClick", mouseOverDuration * 1000, 0, 10000, 100);
m_mouseOverTimestamp = 0.0;
}
}
void HTMLAnchorElement::PrefetchEventHandler::handleLeftMouseDown(Event* event)
{
m_mouseDownTimestamp = event->timeStamp();
blink::Platform::current()->histogramEnumeration("MouseEventPrefetch.MouseDowns", 0, 2);
prefetch(blink::WebPreconnectMotivationLinkMouseDown);
}
void HTMLAnchorElement::PrefetchEventHandler::handleGestureTapUnconfirmed(Event* event)
{
m_hadTapUnconfirmed = true;
blink::Platform::current()->histogramEnumeration("MouseEventPrefetch.TapUnconfirmeds", 0, 2);
prefetch(blink::WebPreconnectMotivationLinkTapUnconfirmed);
}
void HTMLAnchorElement::PrefetchEventHandler::handleGestureShowPress(Event* event)
{
m_tapDownTimestamp = event->timeStamp();
blink::Platform::current()->histogramEnumeration("MouseEventPrefetch.TapDowns", 0, 2);
prefetch(blink::WebPreconnectMotivationLinkTapDown);
}
void HTMLAnchorElement::PrefetchEventHandler::handleClick(Event* event)
{
bool capturedMouseOver = (m_mouseOverTimestamp > 0.0);
if (capturedMouseOver) {
double mouseOverDuration = convertDOMTimeStampToSeconds(event->timeStamp() - m_mouseOverTimestamp);
blink::Platform::current()->histogramCustomCounts("MouseEventPrefetch.MouseOverDuration_Click", mouseOverDuration * 1000, 0, 10000, 100);
}
bool capturedMouseDown = (m_mouseDownTimestamp > 0.0);
blink::Platform::current()->histogramEnumeration("MouseEventPrefetch.MouseDownFollowedByClick", capturedMouseDown, 2);
if (capturedMouseDown) {
double mouseDownDuration = convertDOMTimeStampToSeconds(event->timeStamp() - m_mouseDownTimestamp);
blink::Platform::current()->histogramCustomCounts("MouseEventPrefetch.MouseDownDuration_Click", mouseDownDuration * 1000, 0, 10000, 100);
}
bool capturedTapDown = (m_tapDownTimestamp > 0.0);
if (capturedTapDown) {
double tapDownDuration = convertDOMTimeStampToSeconds(event->timeStamp() - m_tapDownTimestamp);
blink::Platform::current()->histogramCustomCounts("MouseEventPrefetch.TapDownDuration_Click", tapDownDuration * 1000, 0, 10000, 100);
}
int flags = (m_hadTapUnconfirmed ? 2 : 0) | (capturedTapDown ? 1 : 0);
blink::Platform::current()->histogramEnumeration("MouseEventPrefetch.PreTapEventsFollowedByClick", flags, 4);
}
bool HTMLAnchorElement::PrefetchEventHandler::shouldPrefetch(const KURL& url)
{
if (m_hadHREFChanged)
return false;
if (m_anchorElement->hasEventListeners(EventTypeNames::click))
return false;
if (!url.protocolIsInHTTPFamily())
return false;
Document& document = m_anchorElement->document();
if (!document.securityOrigin()->canDisplay(url))
return false;
if (url.hasFragmentIdentifier() && equalIgnoringFragmentIdentifier(document.url(), url))
return false;
LocalFrame* frame = document.frame();
if (!frame)
return false;
// Links which create new window/tab are avoided because they may require user approval interaction.
if (!m_anchorElement->target().isEmpty())
return false;
return true;
}
void HTMLAnchorElement::PrefetchEventHandler::prefetch(blink::WebPreconnectMotivation motivation)
{
const KURL& url = m_anchorElement->href();
if (!shouldPrefetch(url))
return;
// The precision of current MouseOver trigger is too low to actually trigger preconnects.
if (motivation == blink::WebPreconnectMotivationLinkMouseOver)
return;
preconnectToURL(url, motivation);
m_hasIssuedPreconnect = true;
}
bool HTMLAnchorElement::isInteractiveContent() const
{
return isLink();
}
void HTMLAnchorElement::trace(Visitor* visitor)
{
visitor->trace(m_prefetchEventHandler);
HTMLElement::trace(visitor);
}
}
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