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/*
* Copyright (C) 2018 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:
* 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 "ReferrerPolicy.h"
#include "HTTPParsers.h"
#include "JSFetchReferrerPolicy.h"
namespace WebCore {
enum class ShouldParseLegacyKeywords : bool { No, Yes };
static std::optional<ReferrerPolicy> parseReferrerPolicyToken(StringView policy, ShouldParseLegacyKeywords shouldParseLegacyKeywords)
{
// "never" / "default" / "always" are legacy keywords that we support and still defined in the HTML specification:
// https://html.spec.whatwg.org/#meta-referrer
if (shouldParseLegacyKeywords == ShouldParseLegacyKeywords::Yes) {
if (equalLettersIgnoringASCIICase(policy, "never"_s))
return ReferrerPolicy::NoReferrer;
if (equalLettersIgnoringASCIICase(policy, "always"_s))
return ReferrerPolicy::UnsafeUrl;
if (equalLettersIgnoringASCIICase(policy, "default"_s))
return ReferrerPolicy::Default;
}
if (equalLettersIgnoringASCIICase(policy, "no-referrer"_s))
return ReferrerPolicy::NoReferrer;
if (equalLettersIgnoringASCIICase(policy, "unsafe-url"_s))
return ReferrerPolicy::UnsafeUrl;
if (equalLettersIgnoringASCIICase(policy, "origin"_s))
return ReferrerPolicy::Origin;
if (equalLettersIgnoringASCIICase(policy, "origin-when-cross-origin"_s))
return ReferrerPolicy::OriginWhenCrossOrigin;
if (equalLettersIgnoringASCIICase(policy, "same-origin"_s))
return ReferrerPolicy::SameOrigin;
if (equalLettersIgnoringASCIICase(policy, "strict-origin"_s))
return ReferrerPolicy::StrictOrigin;
if (equalLettersIgnoringASCIICase(policy, "strict-origin-when-cross-origin"_s))
return ReferrerPolicy::StrictOriginWhenCrossOrigin;
if (equalLettersIgnoringASCIICase(policy, "no-referrer-when-downgrade"_s))
return ReferrerPolicy::NoReferrerWhenDowngrade;
if (!policy.isNull() && policy.isEmpty())
return ReferrerPolicy::EmptyString;
return std::nullopt;
}
std::optional<ReferrerPolicy> parseReferrerPolicy(StringView policyString, ReferrerPolicySource source)
{
switch (source) {
case ReferrerPolicySource::HTTPHeader: {
// Implementing https://www.w3.org/TR/2017/CR-referrer-policy-20170126/#parse-referrer-policy-from-header.
std::optional<ReferrerPolicy> result;
for (auto tokenView : policyString.split(',')) {
auto token = parseReferrerPolicyToken(tokenView.trim(isASCIIWhitespaceWithoutFF<UChar>), ShouldParseLegacyKeywords::No);
if (token && token.value() != ReferrerPolicy::EmptyString)
result = token.value();
}
return result;
}
case ReferrerPolicySource::MetaTag:
return parseReferrerPolicyToken(policyString, ShouldParseLegacyKeywords::Yes);
case ReferrerPolicySource::ReferrerPolicyAttribute:
return parseReferrerPolicyToken(policyString, ShouldParseLegacyKeywords::No);
}
ASSERT_NOT_REACHED();
return std::nullopt;
}
String referrerPolicyToString(const ReferrerPolicy& referrerPolicy)
{
return convertEnumerationToString(referrerPolicy);
}
} // namespace WebCore
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