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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. AND ITS 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 APPLE INC. OR ITS 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 "SpeculationRulesMatcher.h"
#include "CheckVisibilityOptions.h"
#include "Document.h"
#include "Element.h"
#include "HTMLAnchorElement.h"
#include "JSDOMGlobalObject.h"
#include "ReferrerPolicy.h"
#include "ScriptController.h"
#include "SelectorQuery.h"
#include "ShadowRoot.h"
#include "SpeculationRules.h"
#include "URLPattern.h"
#include "URLPatternOptions.h"
namespace WebCore {
static bool isUnslottedElement(Element& element)
{
for (RefPtr ancestor = &element; ancestor; ) {
RefPtr parent = ancestor->parentElement();
if (parent && parent->shadowRoot() && !ancestor->assignedSlot())
return true;
ancestor = WTFMove(parent);
}
return false;
}
static bool matches(const SpeculationRules::DocumentPredicate&, Document&, HTMLAnchorElement&);
static bool matches(const SpeculationRules::URLPatternPredicate& predicate, HTMLAnchorElement& anchor)
{
for (const auto& patternString : predicate.patterns) {
ExceptionOr<Ref<URLPattern>> exceptionOrPattern = URLPattern::create(anchor.protectedDocument(), patternString, String(anchor.document().baseURL().string()), URLPatternOptions());
if (exceptionOrPattern.hasException())
continue;
Ref<URLPattern> pattern = exceptionOrPattern.returnValue();
auto result = pattern->test(anchor.protectedDocument(), anchor.href().string(), String(anchor.document().baseURL().string()));
if (!result.hasException() && result.returnValue())
return true;
}
return false;
}
static bool matches(const SpeculationRules::CSSSelectorPredicate& predicate, Element& element)
{
for (const auto& selectorString : predicate.selectors) {
auto query = element.protectedDocument()->selectorQueryForString(selectorString);
if (query.hasException())
continue;
if (query.returnValue().matches(element))
return true;
}
return false;
}
static bool matches(const Box<SpeculationRules::Conjunction>& predicate, Document& document, HTMLAnchorElement& anchor)
{
for (const auto& clause : predicate->clauses) {
if (!matches(clause, document, anchor))
return false;
}
return true;
}
static bool matches(const Box<SpeculationRules::Disjunction>& predicate, Document& document, HTMLAnchorElement& anchor)
{
if (predicate->clauses.isEmpty())
return false;
for (const auto& clause : predicate->clauses) {
if (matches(clause, document, anchor))
return true;
}
return false;
}
static bool matches(const Box<SpeculationRules::Negation>& predicate, Document& document, HTMLAnchorElement& anchor)
{
return !matches(*predicate->clause, document, anchor);
}
// https://html.spec.whatwg.org/C#dr-predicate-matches
static bool matches(const SpeculationRules::DocumentPredicate& predicate, Document& document, HTMLAnchorElement& anchor)
{
return WTF::switchOn(predicate.value(),
[&] (const SpeculationRules::URLPatternPredicate& p) { return matches(p, anchor); },
[&] (const SpeculationRules::CSSSelectorPredicate& p) { return matches(p, anchor); },
[&] (const Box<SpeculationRules::Conjunction>& p) { return matches(p, document, anchor); },
[&] (const Box<SpeculationRules::Disjunction>& p) { return matches(p, document, anchor); },
[&] (const Box<SpeculationRules::Negation>& p) { return matches(p, document, anchor); }
);
}
// https://html.spec.whatwg.org/C#find-matching-links
std::optional<PrefetchRule> SpeculationRulesMatcher::hasMatchingRule(Document& document, HTMLAnchorElement& anchor)
{
Ref speculationRules = document.speculationRules();
if (speculationRules->prefetchRules().isEmptyIgnoringNullReferences())
return std::nullopt;
// 2.2 If descendant is not being rendered or is part of skipped contents, then continue.
// An element is not being rendered if:
// - It's unslotted (light DOM child of a shadow host without a slot assignment)
// - It or an ancestor has display:none
// - It's part of content-visibility:hidden content
if (isUnslottedElement(anchor) || !anchor.checkVisibility(CheckVisibilityOptions { }))
return std::nullopt;
const auto& url = anchor.href();
for (auto [node, rules] : speculationRules->prefetchRules()) {
for (const auto& rule : rules) {
for (const auto& href : rule.urls) {
if (href == url)
return PrefetchRule { rule.tags, rule.referrerPolicy, rule.eagerness };
}
if (rule.predicate && matches(rule.predicate.value(), document, anchor)) {
// For document rules, if the rule doesn't specify a referrer policy,
// use the link element's referrerPolicy attribute if present.
auto referrerPolicy = rule.referrerPolicy;
if (!referrerPolicy) {
auto linkReferrerPolicy = anchor.referrerPolicy();
if (linkReferrerPolicy != ReferrerPolicy::EmptyString)
referrerPolicy = linkReferrerPolicy;
}
return PrefetchRule { rule.tags, referrerPolicy, rule.eagerness };
}
}
}
return std::nullopt;
}
} // namespace WebCore
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