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/*
* Copyright (C) 2011 Google 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:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
* OWNER OR 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 "core/loader/LinkLoader.h"
#include "core/FetchInitiatorTypeNames.h"
#include "core/dom/Document.h"
#include "core/fetch/FetchRequest.h"
#include "core/fetch/ResourceFetcher.h"
#include "core/frame/Settings.h"
#include "core/html/LinkRelAttribute.h"
#include "core/loader/PrerenderHandle.h"
#include "platform/Prerender.h"
#include "platform/network/DNS.h"
#include "public/platform/WebPrerender.h"
namespace blink {
static unsigned prerenderRelTypesFromRelAttribute(const LinkRelAttribute& relAttribute)
{
unsigned result = 0;
if (relAttribute.isLinkPrerender())
result |= blink::PrerenderRelTypePrerender;
if (relAttribute.isLinkNext())
result |= blink::PrerenderRelTypeNext;
return result;
}
LinkLoader::LinkLoader(LinkLoaderClient* client)
: m_client(client)
, m_linkLoadTimer(this, &LinkLoader::linkLoadTimerFired)
, m_linkLoadingErrorTimer(this, &LinkLoader::linkLoadingErrorTimerFired)
{
}
LinkLoader::~LinkLoader()
{
}
void LinkLoader::linkLoadTimerFired(Timer<LinkLoader>* timer)
{
ASSERT_UNUSED(timer, timer == &m_linkLoadTimer);
m_client->linkLoaded();
}
void LinkLoader::linkLoadingErrorTimerFired(Timer<LinkLoader>* timer)
{
ASSERT_UNUSED(timer, timer == &m_linkLoadingErrorTimer);
m_client->linkLoadingErrored();
}
void LinkLoader::notifyFinished(Resource* resource)
{
ASSERT(this->resource() == resource);
if (resource->errorOccurred())
m_linkLoadingErrorTimer.startOneShot(0, FROM_HERE);
else
m_linkLoadTimer.startOneShot(0, FROM_HERE);
clearResource();
}
void LinkLoader::didStartPrerender()
{
m_client->didStartLinkPrerender();
}
void LinkLoader::didStopPrerender()
{
m_client->didStopLinkPrerender();
}
void LinkLoader::didSendLoadForPrerender()
{
m_client->didSendLoadForLinkPrerender();
}
void LinkLoader::didSendDOMContentLoadedForPrerender()
{
m_client->didSendDOMContentLoadedForLinkPrerender();
}
bool LinkLoader::loadLink(const LinkRelAttribute& relAttribute, const AtomicString& crossOriginMode, const String& type, const KURL& href, Document& document)
{
if (relAttribute.isDNSPrefetch()) {
Settings* settings = document.settings();
// FIXME: The href attribute of the link element can be in "//hostname" form, and we shouldn't attempt
// to complete that as URL <https://bugs.webkit.org/show_bug.cgi?id=48857>.
if (settings && settings->dnsPrefetchingEnabled() && href.isValid() && !href.isEmpty())
prefetchDNS(href.host());
}
// FIXME(crbug.com/323096): Should take care of import.
if ((relAttribute.isLinkPrefetch() || relAttribute.isLinkSubresource() || relAttribute.isTransitionExitingStylesheet()) && href.isValid() && document.frame()) {
if (!m_client->shouldLoadLink())
return false;
Resource::Type type = relAttribute.isLinkSubresource() ? Resource::LinkSubresource : Resource::LinkPrefetch;
FetchRequest linkRequest(ResourceRequest(document.completeURL(href)), FetchInitiatorTypeNames::link);
if (!crossOriginMode.isNull())
linkRequest.setCrossOriginAccessControl(document.securityOrigin(), crossOriginMode);
setResource(document.fetcher()->fetchLinkResource(type, linkRequest));
}
if (const unsigned prerenderRelTypes = prerenderRelTypesFromRelAttribute(relAttribute)) {
if (!m_prerender) {
m_prerender = PrerenderHandle::create(document, this, href, prerenderRelTypes);
} else if (m_prerender->url() != href) {
m_prerender->cancel();
m_prerender = PrerenderHandle::create(document, this, href, prerenderRelTypes);
}
// TODO(gavinp): Handle changes to rel types of existing prerenders.
} else if (m_prerender) {
m_prerender->cancel();
m_prerender.clear();
}
return true;
}
void LinkLoader::released()
{
// Only prerenders need treatment here; other links either use the Resource interface, or are notionally
// atomic (dns prefetch).
if (m_prerender) {
m_prerender->cancel();
m_prerender.clear();
}
}
void LinkLoader::trace(Visitor* visitor)
{
visitor->trace(m_prerender);
}
}
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