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/*
* Copyright (C) 2011 Google Inc. All rights reserved.
* Copyright (C) 2016 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:
*
* * 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 "LinkLoader.h"
#include "CSSStyleSheet.h"
#include "CachedCSSStyleSheet.h"
#include "CachedResourceLoader.h"
#include "CachedResourceRequest.h"
#include "ContainerNode.h"
#include "CrossOriginAccessControl.h"
#include "Document.h"
#include "Frame.h"
#include "FrameLoaderClient.h"
#include "FrameView.h"
#include "LinkHeader.h"
#include "LinkPreloadResourceClients.h"
#include "LinkRelAttribute.h"
#include "RuntimeEnabledFeatures.h"
#include "Settings.h"
#include "StyleResolver.h"
namespace WebCore {
LinkLoader::LinkLoader(LinkLoaderClient& client)
: m_client(client)
, m_weakPtrFactory(this)
{
}
LinkLoader::~LinkLoader()
{
if (m_cachedLinkResource)
m_cachedLinkResource->removeClient(*this);
if (m_preloadResourceClient)
m_preloadResourceClient->clear();
}
void LinkLoader::triggerEvents(const CachedResource& resource)
{
if (resource.errorOccurred())
m_client.linkLoadingErrored();
else
m_client.linkLoaded();
}
void LinkLoader::notifyFinished(CachedResource& resource)
{
ASSERT_UNUSED(resource, m_cachedLinkResource.get() == &resource);
triggerEvents(*m_cachedLinkResource);
m_cachedLinkResource->removeClient(*this);
m_cachedLinkResource = nullptr;
}
void LinkLoader::loadLinksFromHeader(const String& headerValue, const URL& baseURL, Document& document)
{
if (headerValue.isEmpty())
return;
LinkHeaderSet headerSet(headerValue);
for (auto& header : headerSet) {
if (!header.valid() || header.url().isEmpty() || header.rel().isEmpty())
continue;
LinkRelAttribute relAttribute(header.rel());
URL url(baseURL, header.url());
// Sanity check to avoid re-entrancy here.
if (equalIgnoringFragmentIdentifier(url, baseURL))
continue;
preloadIfNeeded(relAttribute, url, document, header.as(), header.crossOrigin(), nullptr, nullptr);
}
}
std::optional<CachedResource::Type> LinkLoader::resourceTypeFromAsAttribute(const String& as)
{
if (as.isEmpty())
return CachedResource::RawResource;
if (equalLettersIgnoringASCIICase(as, "image"))
return CachedResource::ImageResource;
if (equalLettersIgnoringASCIICase(as, "script"))
return CachedResource::Script;
if (equalLettersIgnoringASCIICase(as, "style"))
return CachedResource::CSSStyleSheet;
if (equalLettersIgnoringASCIICase(as, "media"))
return CachedResource::MediaResource;
if (equalLettersIgnoringASCIICase(as, "font"))
return CachedResource::FontResource;
#if ENABLE(VIDEO_TRACK)
if (equalLettersIgnoringASCIICase(as, "track"))
return CachedResource::TextTrackResource;
#endif
return std::nullopt;
}
static std::unique_ptr<LinkPreloadResourceClient> createLinkPreloadResourceClient(CachedResource& resource, LinkLoader& loader, CachedResource::Type type)
{
switch (type) {
case CachedResource::ImageResource:
return LinkPreloadImageResourceClient::create(loader, static_cast<CachedImage&>(resource));
case CachedResource::Script:
return LinkPreloadScriptResourceClient::create(loader, static_cast<CachedScript&>(resource));
case CachedResource::CSSStyleSheet:
return LinkPreloadStyleResourceClient::create(loader, static_cast<CachedCSSStyleSheet&>(resource));
case CachedResource::FontResource:
return LinkPreloadFontResourceClient::create(loader, static_cast<CachedFont&>(resource));
case CachedResource::MediaResource:
#if ENABLE(VIDEO_TRACK)
case CachedResource::TextTrackResource:
#endif
case CachedResource::RawResource:
return LinkPreloadRawResourceClient::create(loader, static_cast<CachedRawResource&>(resource));
case CachedResource::MainResource:
#if ENABLE(SVG_FONTS)
case CachedResource::SVGFontResource:
#endif
case CachedResource::SVGDocumentResource:
#if ENABLE(XSLT)
case CachedResource::XSLStyleSheet:
#endif
#if ENABLE(LINK_PREFETCH)
case CachedResource::LinkSubresource:
case CachedResource::LinkPrefetch:
#endif
// None of these values is currently supported as an `as` value.
ASSERT_NOT_REACHED();
}
return nullptr;
}
std::unique_ptr<LinkPreloadResourceClient> LinkLoader::preloadIfNeeded(const LinkRelAttribute& relAttribute, const URL& href, Document& document, const String& as, const String& crossOriginMode, LinkLoader* loader, LinkLoaderClient* client)
{
if (!document.loader() || !relAttribute.isLinkPreload)
return nullptr;
ASSERT(RuntimeEnabledFeatures::sharedFeatures().linkPreloadEnabled());
if (!href.isValid()) {
document.addConsoleMessage(MessageSource::Other, MessageLevel::Error, String("<link rel=preload> has an invalid `href` value"));
return nullptr;
}
auto type = LinkLoader::resourceTypeFromAsAttribute(as);
if (!type) {
document.addConsoleMessage(MessageSource::Other, MessageLevel::Error, String("<link rel=preload> must have a valid `as` value"));
if (client)
client->linkLoadingErrored();
return nullptr;
}
ResourceRequest resourceRequest(document.completeURL(href));
resourceRequest.setIgnoreForRequestCount(true);
CachedResourceRequest linkRequest(WTFMove(resourceRequest), CachedResourceLoader::defaultCachedResourceOptions(), CachedResource::defaultPriorityForResourceType(type.value()));
linkRequest.setInitiator("link");
linkRequest.setIsLinkPreload();
linkRequest.setAsPotentiallyCrossOrigin(crossOriginMode, document);
CachedResourceHandle<CachedResource> cachedLinkResource = document.cachedResourceLoader().preload(type.value(), WTFMove(linkRequest));
if (cachedLinkResource && loader)
return createLinkPreloadResourceClient(*cachedLinkResource, *loader, type.value());
return nullptr;
}
void LinkLoader::cancelLoad()
{
if (m_preloadResourceClient)
m_preloadResourceClient->clear();
}
bool LinkLoader::loadLink(const LinkRelAttribute& relAttribute, const URL& href, const String& as, const String& crossOrigin, Document& document)
{
if (relAttribute.isDNSPrefetch) {
// 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 (document.settings().dnsPrefetchingEnabled() && href.isValid() && !href.isEmpty() && document.frame())
document.frame()->loader().client().prefetchDNS(href.host());
}
if (m_client.shouldLoadLink()) {
auto resourceClient = preloadIfNeeded(relAttribute, href, document, as, crossOrigin, this, &m_client);
if (resourceClient)
m_preloadResourceClient = WTFMove(resourceClient);
else if (m_preloadResourceClient)
m_preloadResourceClient->clear();
}
#if ENABLE(LINK_PREFETCH)
if ((relAttribute.isLinkPrefetch || relAttribute.isLinkSubresource) && href.isValid() && document.frame()) {
if (!m_client.shouldLoadLink())
return false;
std::optional<ResourceLoadPriority> priority;
CachedResource::Type type = CachedResource::LinkPrefetch;
if (relAttribute.isLinkSubresource) {
// We only make one request to the cached resource loader if multiple rel types are specified;
// this is the higher priority, which should overwrite the lower priority.
priority = ResourceLoadPriority::Low;
type = CachedResource::LinkSubresource;
}
if (m_cachedLinkResource) {
m_cachedLinkResource->removeClient(*this);
m_cachedLinkResource = nullptr;
}
ResourceLoaderOptions options = CachedResourceLoader::defaultCachedResourceOptions();
options.contentSecurityPolicyImposition = ContentSecurityPolicyImposition::SkipPolicyCheck;
m_cachedLinkResource = document.cachedResourceLoader().requestLinkResource(type, CachedResourceRequest(ResourceRequest(document.completeURL(href)), options, priority));
if (m_cachedLinkResource)
m_cachedLinkResource->addClient(*this);
}
#endif
return true;
}
}
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