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/*
* Copyright (C) 2011 Google 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/text/StringView.h>
#include <wtf/text/WTFString.h>
namespace WebCore {
LinkRelAttribute::LinkRelAttribute()
: iconType()
, isStyleSheet(false)
, isAlternate(false)
, isDNSPrefetch(false)
, isLinkPreload(false)
, isLinkPreconnect(false)
, isLinkPrefetch(false)
#if ENABLE(APPLICATION_MANIFEST)
, isApplicationManifest(false)
#endif
{
}
// Keep LinkRelAttribute::isSupported() in sync when updating this constructor.
LinkRelAttribute::LinkRelAttribute(Document& document, const String& rel)
: LinkRelAttribute()
{
if (equalLettersIgnoringASCIICase(rel, "stylesheet"_s))
isStyleSheet = true;
else if (equalLettersIgnoringASCIICase(rel, "icon"_s) || equalLettersIgnoringASCIICase(rel, "shortcut icon"_s))
iconType = LinkIconType::Favicon;
else if (equalLettersIgnoringASCIICase(rel, "apple-touch-icon"_s))
iconType = LinkIconType::TouchIcon;
else if (equalLettersIgnoringASCIICase(rel, "apple-touch-icon-precomposed"_s))
iconType = LinkIconType::TouchPrecomposedIcon;
else if (equalLettersIgnoringASCIICase(rel, "dns-prefetch"_s))
isDNSPrefetch = true;
else if (document.settings().linkPreconnectEnabled() && equalLettersIgnoringASCIICase(rel, "preconnect"_s))
isLinkPreconnect = true;
else if (document.settings().linkPreloadEnabled() && equalLettersIgnoringASCIICase(rel, "preload"_s))
isLinkPreload = true;
else if (document.settings().linkPrefetchEnabled() && equalLettersIgnoringASCIICase(rel, "prefetch"_s))
isLinkPrefetch = true;
else if (equalLettersIgnoringASCIICase(rel, "alternate stylesheet"_s) || equalLettersIgnoringASCIICase(rel, "stylesheet alternate"_s)) {
isStyleSheet = true;
isAlternate = true;
#if ENABLE(APPLICATION_MANIFEST)
} else if (equalLettersIgnoringASCIICase(rel, "manifest"_s)) {
isApplicationManifest = true;
#endif
} else {
// Tokenize the rel attribute and set bits based on specific keywords that we find.
String relCopy = makeStringByReplacingAll(rel, '\n', ' ');
for (auto word : StringView(relCopy).split(' ')) {
if (equalLettersIgnoringASCIICase(word, "stylesheet"_s))
isStyleSheet = true;
else if (equalLettersIgnoringASCIICase(word, "alternate"_s))
isAlternate = true;
else if (equalLettersIgnoringASCIICase(word, "icon"_s))
iconType = LinkIconType::Favicon;
else if (equalLettersIgnoringASCIICase(word, "apple-touch-icon"_s))
iconType = LinkIconType::TouchIcon;
else if (equalLettersIgnoringASCIICase(word, "apple-touch-icon-precomposed"_s))
iconType = LinkIconType::TouchPrecomposedIcon;
}
}
}
// https://html.spec.whatwg.org/#linkTypes
bool LinkRelAttribute::isSupported(Document& document, StringView attribute)
{
static constexpr ASCIILiteral supportedAttributes[] = {
"alternate"_s, "dns-prefetch"_s, "icon"_s, "stylesheet"_s, "apple-touch-icon"_s, "apple-touch-icon-precomposed"_s,
#if ENABLE(APPLICATION_MANIFEST)
"manifest"_s,
#endif
};
for (auto supportedAttribute : supportedAttributes) {
if (equalIgnoringASCIICase(attribute, supportedAttribute))
return true;
}
if (document.settings().linkPreconnectEnabled() && equalLettersIgnoringASCIICase(attribute, "preconnect"_s))
return true;
if (document.settings().linkPreloadEnabled() && equalLettersIgnoringASCIICase(attribute, "preload"_s))
return true;
if (document.settings().linkPrefetchEnabled() && equalLettersIgnoringASCIICase(attribute, "prefetch"_s))
return true;
return false;
}
}
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