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/*
* Copyright (C) 2025 Shopify 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:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. 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 "LoadableSpeculationRules.h"
#include "CachedResourceLoader.h"
#include "CachedResourceRequest.h"
#include "CachedScript.h"
#include "CrossOriginAccessControl.h"
#include "Document.h"
#include "DocumentInlines.h"
#include "DocumentResourceLoader.h"
#include "FrameDestructionObserverInlines.h"
#include "LocalFrame.h"
#include "ResourceRequest.h"
#include "ScriptController.h"
#include "ScriptSourceCode.h"
#include <wtf/text/MakeString.h>
#include <wtf/text/StringConcatenate.h>
namespace WebCore {
Ref<LoadableSpeculationRules> LoadableSpeculationRules::create(Document& document, const URL& url)
{
return adoptRef(*new LoadableSpeculationRules(document, url));
}
LoadableSpeculationRules::LoadableSpeculationRules(Document& document, const URL& url)
: m_document(document)
, m_url(url)
{
}
LoadableSpeculationRules::~LoadableSpeculationRules()
{
if (m_cachedScript)
m_cachedScript->removeClient(*this);
}
CachedResourceHandle<CachedScript> LoadableSpeculationRules::requestSpeculationRules(Document& document, const URL& sourceURL)
{
// https://html.spec.whatwg.org/C#the-speculation-rules-header
// 3.4.2.2.1. Let request be a new request whose URL is url, destination is "speculationrules", and mode is "cors".
if (!document.settings().isScriptEnabled())
return nullptr;
ResourceLoaderOptions options = CachedResourceLoader::defaultCachedResourceOptions();
options.contentSecurityPolicyImposition = ContentSecurityPolicyImposition::DoPolicyCheck;
options.sameOriginDataURLFlag = SameOriginDataURLFlag::Set;
options.serviceWorkersMode = ServiceWorkersMode::All;
options.integrity = ""_s;
options.referrerPolicy = ReferrerPolicy::EmptyString;
options.fetchPriority = RequestPriority::Auto;
options.destination = FetchOptionsDestination::Speculationrules;
auto request = createPotentialAccessControlRequest(URL { sourceURL }, WTFMove(options), document, ""_s);
request.upgradeInsecureRequestIfNeeded(document);
request.setPriority(ResourceLoadPriority::Low);
return document.protectedCachedResourceLoader()->requestScript(WTFMove(request)).value_or(nullptr);
}
bool LoadableSpeculationRules::load(Document& document, const URL& url)
{
ASSERT(!m_cachedScript);
if (!url.isValid())
return false;
CachedResourceHandle cachedScript = requestSpeculationRules(document, m_url);
m_cachedScript = cachedScript;
if (!cachedScript)
return false;
cachedScript->addClient(*this);
return true;
}
// https://html.spec.whatwg.org/C#the-speculation-rules-header
// 3.4.2.2. processResponseConsumeBody
void LoadableSpeculationRules::notifyFinished(CachedResource& resource, const NetworkLoadMetrics&, LoadWillContinueInAnotherProcess)
{
ASSERT(&resource == m_cachedScript.get());
RefPtr document = m_document.get();
if (!document)
return;
// 1. If bodyBytes is null or failure, then abort these steps.
// 2. If response's status is not an ok status, then abort these steps.
if (m_cachedScript->errorOccurred()) {
document->addConsoleMessage(MessageSource::Other, MessageLevel::Error, makeString("Failed to load speculation rules from "_s, m_url.string()));
return;
}
// 3. If the result of extracting a MIME type from response's header list does not have an essence of "application/speculationrules+json", then abort these steps.
if (resource.mimeType() != "application/speculationrules+json") {
document->addConsoleMessage(MessageSource::Other, MessageLevel::Error, makeString("Invalid speculation rules MIME type "_s, m_url.string()));
return;
}
// 4. Let bodyText be the result of UTF-8 decoding bodyBytes.
if (resource.encoding() != "UTF-8"_s) {
document->addConsoleMessage(MessageSource::Other, MessageLevel::Error, makeString("Invalid speculation rules encoding "_s, m_url.string()));
return;
}
String speculationRulesText = m_cachedScript->script().toString();
if (speculationRulesText.isEmpty())
return;
if (RefPtr frame = document->frame()) {
ScriptSourceCode sourceCode(speculationRulesText, JSC::SourceTaintedOrigin::Untainted, URL(m_url), TextPosition(), JSC::SourceProviderSourceType::Program);
// 5. Let ruleSet be the result of parsing a speculation rule set string given bodyText, document, and response's URL. If this throws an exception, then abort these steps.
// 6. Append ruleSet to document's speculation rule sets.
if (frame->checkedScript()->registerSpeculationRules(sourceCode, m_url)) {
// 7. Consider speculative loads for document.
document->considerSpeculationRules();
}
}
}
} // namespace WebCore
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