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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/core/html/rel_list.h"
#include "third_party/blink/renderer/core/dom/element.h"
#include "third_party/blink/renderer/core/execution_context/execution_context.h"
#include "third_party/blink/renderer/core/html/html_element.h"
#include "third_party/blink/renderer/core/html_names.h"
#include "third_party/blink/renderer/core/origin_trials/origin_trials.h"
#include "third_party/blink/renderer/platform/runtime_enabled_features.h"
#include "third_party/blink/renderer/platform/wtf/hash_map.h"
namespace blink {
RelList::RelList(Element* element)
: DOMTokenList(*element, html_names::kRelAttr) {}
static HashSet<AtomicString>& SupportedTokensLink() {
// There is a use counter for <link rel="monetization"> but the feature is
// actually not implemented yet, so "monetization" is not included in the
// list below. See https://crbug.com/1031476
DEFINE_STATIC_LOCAL(
HashSet<AtomicString>, tokens,
({
"preload", "preconnect", "dns-prefetch", "stylesheet", "import",
"icon", "alternate", "prefetch", "prerender", "next", "manifest",
"apple-touch-icon", "apple-touch-icon-precomposed", "canonical",
}));
return tokens;
}
static HashSet<AtomicString>& SupportedTokensAnchorAndArea() {
DEFINE_STATIC_LOCAL(HashSet<AtomicString>, tokens,
({
"noreferrer", "noopener",
}));
return tokens;
}
bool RelList::ValidateTokenValue(const AtomicString& token_value,
ExceptionState&) const {
// https://html.spec.whatwg.org/C/#linkTypes
if (GetElement().HasTagName(html_names::kLinkTag)) {
if (SupportedTokensLink().Contains(token_value) ||
token_value == "modulepreload") {
return true;
}
if (RuntimeEnabledFeatures::SignedExchangeSubresourcePrefetchEnabled(
GetElement().GetExecutionContext()) &&
token_value == "allowed-alt-sxg") {
return true;
}
if (RuntimeEnabledFeatures::SubresourceWebBundlesEnabled(
GetElement().GetExecutionContext()) &&
token_value == "webbundle") {
return true;
}
if (RuntimeEnabledFeatures::MediaFeedsEnabled(
GetElement().GetExecutionContext()) &&
token_value == "media-feed") {
return true;
}
} else if ((GetElement().HasTagName(html_names::kATag) ||
GetElement().HasTagName(html_names::kAreaTag)) &&
SupportedTokensAnchorAndArea().Contains(token_value)) {
return true;
}
return false;
}
} // namespace blink
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