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/*
* Copyright (C) 2011 Google Inc. All rights reserved.
* Copyright (C) 2013-2025 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 "LinkRelAttribute.h"
#include "Document.h"
#include "LinkIconType.h"
#include "Settings.h"
#include <wtf/SortedArrayMap.h>
#include <wtf/text/StringView.h>
#include <wtf/text/WTFString.h>
namespace WebCore {
// https://html.spec.whatwg.org/#linkTypes
struct LinkTypeDetails {
bool (*isEnabled)(const Document&);
void (*updateRel)(LinkRelAttribute&);
};
static constexpr std::pair<ComparableLettersLiteral, LinkTypeDetails> linkTypesArray[] = {
{ "alternate"_s, { [](auto) { return true; }, [](auto relAttribute) { relAttribute.isAlternate = true; } } },
{ "apple-touch-icon"_s, { [](auto) { return true; }, [](auto relAttribute) { relAttribute.iconType = LinkIconType::TouchIcon; } } },
{ "apple-touch-icon-precomposed"_s, { [](auto) { return true; }, [](auto relAttribute) { relAttribute.iconType = LinkIconType::TouchPrecomposedIcon; } } },
{ "dns-prefetch"_s, { [](auto document) { return document.settings().linkDNSPrefetchEnabled(); }, [](auto relAttribute) { relAttribute.isDNSPrefetch = true; } } },
{ "expect"_s, { [](auto) { return true; }, [](auto relAttribute) { relAttribute.isInternalResourceLink = true; } } },
{ "icon"_s, { [](auto) { return true; }, [](auto relAttribute) { relAttribute.iconType = LinkIconType::Favicon; } } },
#if ENABLE(APPLICATION_MANIFEST)
{ "manifest"_s, { [](auto) { return true; }, [](auto relAttribute) { relAttribute.isApplicationManifest = true; } } },
#else
{ "manifest"_s, { [](auto) { return false; }, [](auto) { } } },
#endif
{ "modulepreload"_s, { [](auto) { return true; }, [](auto relAttribute) { relAttribute.isLinkModulePreload = true; } } },
{ "preconnect"_s, { [](auto document) { return document.settings().linkPreconnectEnabled(); }, [](auto relAttribute) { relAttribute.isLinkPreconnect = true; } } },
{ "prefetch"_s, { [](auto document) { return document.settings().linkPrefetchEnabled(); }, [](auto relAttribute) { relAttribute.isLinkPrefetch = true; } } },
{ "preload"_s, { [](auto document) { return document.settings().linkPreloadEnabled(); }, [](auto relAttribute) { relAttribute.isLinkPreload = true; } } },
#if ENABLE(WEB_PAGE_SPATIAL_BACKDROP)
{ "spatial-backdrop"_s, {
[](auto document) { return document.settings().webPageSpatialBackdropEnabled(); },
[](auto relAttribute) { relAttribute.isSpatialBackdrop = true; }
} },
#endif
{ "stylesheet"_s, { [](auto) { return true; }, [](auto relAttribute) { relAttribute.isStyleSheet = true; } } },
};
static constexpr SortedArrayMap linkTypes { linkTypesArray };
LinkRelAttribute::LinkRelAttribute(Document& document, StringView rel)
{
if (auto linkType = linkTypes.tryGet(rel)) {
if (linkType->isEnabled(document))
linkType->updateRel(*this);
return;
}
if (equalLettersIgnoringASCIICase(rel, "shortcut icon"_s))
iconType = LinkIconType::Favicon;
else if (equalLettersIgnoringASCIICase(rel, "alternate stylesheet"_s) || equalLettersIgnoringASCIICase(rel, "stylesheet alternate"_s)) {
isStyleSheet = true;
isAlternate = true;
} else {
// Tokenize the rel attribute and set bits based on specific keywords that we find.
unsigned length = rel.length();
unsigned start = 0;
while (start < length) {
if (isASCIIWhitespace(rel[start])) {
start++;
continue;
}
unsigned end = start + 1;
while (end < length && !isASCIIWhitespace(rel[end]))
end++;
if (auto linkType = linkTypes.tryGet(rel.substring(start, end - start))) {
if (linkType->isEnabled(document))
linkType->updateRel(*this);
}
start = end;
}
}
}
bool LinkRelAttribute::isSupported(Document& document, StringView attribute)
{
if (auto linkType = linkTypes.tryGet(attribute))
return linkType->isEnabled(document);
return false;
}
}
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