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/*
* Copyright (C) 2011 Google Inc. All rights reserved.
* Copyright (C) 2016-2017 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 "DefaultResourceLoadPriority.h"
#include "Document.h"
#include "Frame.h"
#include "FrameLoader.h"
#include "FrameLoaderClient.h"
#include "FrameView.h"
#include "HTMLSrcsetParser.h"
#include "LinkHeader.h"
#include "LinkPreloadResourceClients.h"
#include "LinkRelAttribute.h"
#include "LoaderStrategy.h"
#include "MIMETypeRegistry.h"
#include "MediaList.h"
#include "MediaQueryEvaluator.h"
#include "PlatformStrategies.h"
#include "ResourceError.h"
#include "RuntimeEnabledFeatures.h"
#include "Settings.h"
#include "SizesAttributeParser.h"
#include "StyleResolver.h"
namespace WebCore {
LinkLoader::LinkLoader(LinkLoaderClient& client)
: m_client(client)
{
}
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, const NetworkLoadMetrics&)
{
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, MediaAttributeCheck mediaAttributeCheck)
{
if (headerValue.isEmpty())
return;
LinkHeaderSet headerSet(headerValue);
for (auto& header : headerSet) {
if (!header.valid() || header.url().isEmpty() || header.rel().isEmpty())
continue;
if ((mediaAttributeCheck == MediaAttributeCheck::MediaAttributeNotEmpty && !header.isViewportDependent())
|| (mediaAttributeCheck == MediaAttributeCheck::MediaAttributeEmpty && header.isViewportDependent())) {
continue;
}
LinkRelAttribute relAttribute(document, header.rel());
URL url(baseURL, header.url());
// Sanity check to avoid re-entrancy here.
if (equalIgnoringFragmentIdentifier(url, baseURL))
continue;
LinkLoadParameters params { relAttribute, url, header.as(), header.media(), header.mimeType(), header.crossOrigin(), header.imageSrcSet(), header.imageSizes(), header.nonce(), ReferrerPolicy::EmptyString };
preconnectIfNeeded(params, document);
preloadIfNeeded(params, document, nullptr);
}
}
std::optional<CachedResource::Type> LinkLoader::resourceTypeFromAsAttribute(const String& as, Document& document)
{
if (equalLettersIgnoringASCIICase(as, "fetch"_s))
return CachedResource::Type::RawResource;
if (equalLettersIgnoringASCIICase(as, "image"_s))
return CachedResource::Type::ImageResource;
if (equalLettersIgnoringASCIICase(as, "script"_s))
return CachedResource::Type::Script;
if (equalLettersIgnoringASCIICase(as, "style"_s))
return CachedResource::Type::CSSStyleSheet;
if (document.settings().mediaPreloadingEnabled() && (equalLettersIgnoringASCIICase(as, "video"_s) || equalLettersIgnoringASCIICase(as, "audio"_s)))
return CachedResource::Type::MediaResource;
if (equalLettersIgnoringASCIICase(as, "font"_s))
return CachedResource::Type::FontResource;
if (equalLettersIgnoringASCIICase(as, "track"_s))
return CachedResource::Type::TextTrackResource;
return std::nullopt;
}
static std::unique_ptr<LinkPreloadResourceClient> createLinkPreloadResourceClient(CachedResource& resource, LinkLoader& loader, Document& document)
{
switch (resource.type()) {
case CachedResource::Type::ImageResource:
return makeUnique<LinkPreloadImageResourceClient>(loader, downcast<CachedImage>(resource));
case CachedResource::Type::Script:
return makeUnique<LinkPreloadDefaultResourceClient>(loader, downcast<CachedScript>(resource));
case CachedResource::Type::CSSStyleSheet:
return makeUnique<LinkPreloadStyleResourceClient>(loader, downcast<CachedCSSStyleSheet>(resource));
case CachedResource::Type::FontResource:
return makeUnique<LinkPreloadFontResourceClient>(loader, downcast<CachedFont>(resource));
case CachedResource::Type::TextTrackResource:
return makeUnique<LinkPreloadDefaultResourceClient>(loader, downcast<CachedTextTrack>(resource));
case CachedResource::Type::MediaResource:
ASSERT_UNUSED(document, document.settings().mediaPreloadingEnabled());
FALLTHROUGH;
case CachedResource::Type::RawResource:
return makeUnique<LinkPreloadRawResourceClient>(loader, downcast<CachedRawResource>(resource));
case CachedResource::Type::MainResource:
case CachedResource::Type::Icon:
case CachedResource::Type::SVGFontResource:
case CachedResource::Type::SVGDocumentResource:
#if ENABLE(XSLT)
case CachedResource::Type::XSLStyleSheet:
#endif
case CachedResource::Type::Beacon:
case CachedResource::Type::Ping:
case CachedResource::Type::LinkPrefetch:
#if ENABLE(APPLICATION_MANIFEST)
case CachedResource::Type::ApplicationManifest:
#endif
#if ENABLE(MODEL_ELEMENT)
case CachedResource::Type::ModelResource:
#endif
// None of these values is currently supported as an `as` value.
ASSERT_NOT_REACHED();
}
return nullptr;
}
bool LinkLoader::isSupportedType(CachedResource::Type resourceType, const String& mimeType, Document& document)
{
if (mimeType.isEmpty())
return true;
switch (resourceType) {
case CachedResource::Type::ImageResource:
return MIMETypeRegistry::isSupportedImageVideoOrSVGMIMEType(mimeType);
case CachedResource::Type::Script:
return MIMETypeRegistry::isSupportedJavaScriptMIMEType(mimeType);
case CachedResource::Type::CSSStyleSheet:
return MIMETypeRegistry::isSupportedStyleSheetMIMEType(mimeType);
case CachedResource::Type::FontResource:
return MIMETypeRegistry::isSupportedFontMIMEType(mimeType);
case CachedResource::Type::MediaResource:
if (!document.settings().mediaPreloadingEnabled())
ASSERT_NOT_REACHED();
return MIMETypeRegistry::isSupportedMediaMIMEType(mimeType);
case CachedResource::Type::TextTrackResource:
return MIMETypeRegistry::isSupportedTextTrackMIMEType(mimeType);
case CachedResource::Type::RawResource:
#if ENABLE(APPLICATION_MANIFEST)
case CachedResource::Type::ApplicationManifest:
#endif
return true;
default:
ASSERT_NOT_REACHED();
}
return false;
}
void LinkLoader::preconnectIfNeeded(const LinkLoadParameters& params, Document& document)
{
const URL href = params.href;
if (!params.relAttribute.isLinkPreconnect || !href.isValid() || !params.href.protocolIsInHTTPFamily() || !document.frame())
return;
ASSERT(document.settings().linkPreconnectEnabled());
StoredCredentialsPolicy storageCredentialsPolicy = StoredCredentialsPolicy::Use;
if (equalLettersIgnoringASCIICase(params.crossOrigin, "anonymous"_s) && !document.securityOrigin().isSameOriginDomain(SecurityOrigin::create(href)))
storageCredentialsPolicy = StoredCredentialsPolicy::DoNotUse;
ASSERT(document.frame()->loader().networkingContext());
platformStrategies()->loaderStrategy()->preconnectTo(document.frame()->loader(), href, storageCredentialsPolicy, LoaderStrategy::ShouldPreconnectAsFirstParty::No, [weakDocument = WeakPtr { document }, href](ResourceError error) {
if (!weakDocument)
return;
if (!error.isNull())
weakDocument->addConsoleMessage(MessageSource::Network, MessageLevel::Error, makeString("Failed to preconnect to "_s, href.string(), ". Error: "_s, error.localizedDescription()));
else
weakDocument->addConsoleMessage(MessageSource::Network, MessageLevel::Info, makeString("Successfully preconnected to "_s, href.string()));
});
}
std::unique_ptr<LinkPreloadResourceClient> LinkLoader::preloadIfNeeded(const LinkLoadParameters& params, Document& document, LinkLoader* loader)
{
if (!document.loader() || !params.relAttribute.isLinkPreload)
return nullptr;
ASSERT(document.settings().linkPreloadEnabled());
auto type = LinkLoader::resourceTypeFromAsAttribute(params.as, document);
if (!type) {
document.addConsoleMessage(MessageSource::Other, MessageLevel::Error, "<link rel=preload> must have a valid `as` value"_s);
return nullptr;
}
URL url;
if (document.settings().linkPreloadResponsiveImagesEnabled() && type == CachedResource::Type::ImageResource && !params.imageSrcSet.isEmpty()) {
auto sourceSize = SizesAttributeParser(params.imageSizes, document).length();
auto candidate = bestFitSourceForImageAttributes(document.deviceScaleFactor(), AtomString { params.href.string() }, AtomString { params.imageSrcSet }, sourceSize);
url = document.completeURL(URL({ }, candidate.string.toString()).string());
} else
url = document.completeURL(params.href.string());
if (!url.isValid()) {
if (params.imageSrcSet.isEmpty())
document.addConsoleMessage(MessageSource::Other, MessageLevel::Error, "<link rel=preload> has an invalid `href` value"_s);
else
document.addConsoleMessage(MessageSource::Other, MessageLevel::Error, "<link rel=preload> has an invalid `imagesrcset` value"_s);
return nullptr;
}
if (!MediaQueryEvaluator::mediaAttributeMatches(document, params.media))
return nullptr;
if (!isSupportedType(type.value(), params.mimeType, document))
return nullptr;
auto options = CachedResourceLoader::defaultCachedResourceOptions();
options.referrerPolicy = params.referrerPolicy;
options.nonce = params.nonce;
auto linkRequest = createPotentialAccessControlRequest(url, WTFMove(options), document, params.crossOrigin);
linkRequest.setPriority(DefaultResourceLoadPriority::forResourceType(type.value()));
linkRequest.setInitiator("link"_s);
linkRequest.setIgnoreForRequestCount(true);
linkRequest.setIsLinkPreload();
auto cachedLinkResource = document.cachedResourceLoader().preload(type.value(), WTFMove(linkRequest)).value_or(nullptr);
if (cachedLinkResource && cachedLinkResource->type() != *type)
return nullptr;
if (cachedLinkResource && loader)
return createLinkPreloadResourceClient(*cachedLinkResource, *loader, document);
return nullptr;
}
void LinkLoader::prefetchIfNeeded(const LinkLoadParameters& params, Document& document)
{
if (!params.href.isValid() || !document.frame())
return;
ASSERT(document.settings().linkPrefetchEnabled());
std::optional<ResourceLoadPriority> priority;
CachedResource::Type type = CachedResource::Type::LinkPrefetch;
if (m_cachedLinkResource) {
m_cachedLinkResource->removeClient(*this);
m_cachedLinkResource = nullptr;
}
// FIXME: Add further prefetch restrictions/limitations:
// - third-party iframes cannot trigger prefetches
// - Number of prefetches of a given page is limited (to 1 maybe?)
ResourceLoaderOptions options = CachedResourceLoader::defaultCachedResourceOptions();
options.contentSecurityPolicyImposition = ContentSecurityPolicyImposition::SkipPolicyCheck;
options.certificateInfoPolicy = CertificateInfoPolicy::IncludeCertificateInfo;
options.credentials = FetchOptions::Credentials::SameOrigin;
options.redirect = FetchOptions::Redirect::Manual;
options.mode = FetchOptions::Mode::Navigate;
options.serviceWorkersMode = ServiceWorkersMode::None;
options.cachingPolicy = CachingPolicy::DisallowCaching;
options.referrerPolicy = params.referrerPolicy;
options.nonce = params.nonce;
m_cachedLinkResource = document.cachedResourceLoader().requestLinkResource(type, CachedResourceRequest(ResourceRequest { document.completeURL(params.href.string()) }, options, priority)).value_or(nullptr);
if (m_cachedLinkResource)
m_cachedLinkResource->addClient(*this);
}
void LinkLoader::cancelLoad()
{
if (m_preloadResourceClient)
m_preloadResourceClient->clear();
}
void LinkLoader::loadLink(const LinkLoadParameters& params, Document& document)
{
if (params.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() && params.href.isValid() && !params.href.isEmpty() && document.frame())
document.frame()->loader().client().prefetchDNS(params.href.host().toString());
}
preconnectIfNeeded(params, document);
if (params.relAttribute.isLinkPrefetch) {
prefetchIfNeeded(params, document);
return;
}
if (m_client.shouldLoadLink()) {
auto resourceClient = preloadIfNeeded(params, document, this);
if (m_preloadResourceClient)
m_preloadResourceClient->clear();
if (resourceClient)
m_preloadResourceClient = WTFMove(resourceClient);
}
}
}