ReferrerPolicy.cpp [plain text]
#include "config.h"
#include "ReferrerPolicy.h"
#include "HTTPParsers.h"
#include <wtf/Optional.h>
namespace WebCore {
enum class ShouldParseLegacyKeywords { No, Yes };
static Optional<ReferrerPolicy> parseReferrerPolicyToken(StringView policy, ShouldParseLegacyKeywords shouldParseLegacyKeywords)
{
if (shouldParseLegacyKeywords == ShouldParseLegacyKeywords::Yes) {
if (equalLettersIgnoringASCIICase(policy, "never"))
return ReferrerPolicy::NoReferrer;
if (equalLettersIgnoringASCIICase(policy, "always"))
return ReferrerPolicy::UnsafeUrl;
if (equalLettersIgnoringASCIICase(policy, "default"))
return ReferrerPolicy::NoReferrerWhenDowngrade;
}
if (equalLettersIgnoringASCIICase(policy, "no-referrer"))
return ReferrerPolicy::NoReferrer;
if (equalLettersIgnoringASCIICase(policy, "unsafe-url"))
return ReferrerPolicy::UnsafeUrl;
if (equalLettersIgnoringASCIICase(policy, "origin"))
return ReferrerPolicy::Origin;
if (equalLettersIgnoringASCIICase(policy, "origin-when-cross-origin"))
return ReferrerPolicy::OriginWhenCrossOrigin;
if (equalLettersIgnoringASCIICase(policy, "same-origin"))
return ReferrerPolicy::SameOrigin;
if (equalLettersIgnoringASCIICase(policy, "strict-origin"))
return ReferrerPolicy::StrictOrigin;
if (equalLettersIgnoringASCIICase(policy, "strict-origin-when-cross-origin"))
return ReferrerPolicy::StrictOriginWhenCrossOrigin;
if (equalLettersIgnoringASCIICase(policy, "no-referrer-when-downgrade"))
return ReferrerPolicy::NoReferrerWhenDowngrade;
if (!policy.isNull() && policy.isEmpty())
return ReferrerPolicy::EmptyString;
return WTF::nullopt;
}
Optional<ReferrerPolicy> parseReferrerPolicy(StringView policyString, ReferrerPolicySource source)
{
switch (source) {
case ReferrerPolicySource::HTTPHeader: {
Optional<ReferrerPolicy> result;
for (auto tokenView : policyString.split(',')) {
auto token = parseReferrerPolicyToken(stripLeadingAndTrailingHTTPSpaces(tokenView), 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 WTF::nullopt;
}
String referrerPolicyToString(const ReferrerPolicy& referrerPolicy)
{
switch (referrerPolicy) {
case ReferrerPolicy::NoReferrer:
return "no-referrer"_s;
case ReferrerPolicy::UnsafeUrl:
return "unsafe-url"_s;
case ReferrerPolicy::Origin:
return "origin"_s;
case ReferrerPolicy::OriginWhenCrossOrigin:
return "origin-when-cross-origin"_s;
case ReferrerPolicy::SameOrigin:
return "same-origin"_s;
case ReferrerPolicy::StrictOrigin:
return "strict-origin"_s;
case ReferrerPolicy::StrictOriginWhenCrossOrigin:
return "strict-origin-when-cross-origin"_s;
case ReferrerPolicy::NoReferrerWhenDowngrade:
return "no-referrer-when-downgrade"_s;
case ReferrerPolicy::EmptyString:
return { };
}
ASSERT_NOT_REACHED();
return { };
}
}