tenfourfox/netwerk/base/ReferrerPolicy.h

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2017-04-19 07:56:45 +00:00
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef ReferrerPolicy_h__
#define ReferrerPolicy_h__
#include "nsStringGlue.h"
#include "nsIHttpChannel.h"
namespace mozilla { namespace net {
enum ReferrerPolicy {
/* spec tokens: never no-referrer */
RP_No_Referrer = nsIHttpChannel::REFERRER_POLICY_NO_REFERRER,
/* spec tokens: origin */
RP_Origin = nsIHttpChannel::REFERRER_POLICY_ORIGIN,
/* spec tokens: default no-referrer-when-downgrade */
RP_No_Referrer_When_Downgrade = nsIHttpChannel::REFERRER_POLICY_NO_REFERRER_WHEN_DOWNGRADE,
RP_Default = nsIHttpChannel::REFERRER_POLICY_DEFAULT,
/* spec tokens: origin-when-cross-origin */
RP_Origin_When_Crossorigin = nsIHttpChannel::REFERRER_POLICY_ORIGIN_WHEN_XORIGIN,
/* spec tokens: always unsafe-url */
RP_Unsafe_URL = nsIHttpChannel::REFERRER_POLICY_UNSAFE_URL,
/* referrer policy is not set */
RP_Unset = nsIHttpChannel::REFERRER_POLICY_NO_REFERRER_WHEN_DOWNGRADE
};
/* spec tokens: never no-referrer */
const char kRPS_Never[] = "never";
const char kRPS_No_Referrer[] = "no-referrer";
/* spec tokens: origin */
const char kRPS_Origin[] = "origin";
/* spec tokens: default no-referrer-when-downgrade */
const char kRPS_Default[] = "default";
const char kRPS_No_Referrer_When_Downgrade[] = "no-referrer-when-downgrade";
/* spec tokens: origin-when-cross-origin */
const char kRPS_Origin_When_Cross_Origin[] = "origin-when-cross-origin";
const char kRPS_Origin_When_Crossorigin[] = "origin-when-crossorigin";
/* spec tokens: always unsafe-url */
const char kRPS_Always[] = "always";
const char kRPS_Unsafe_URL[] = "unsafe-url";
inline ReferrerPolicy
ReferrerPolicyFromString(const nsAString& content)
{
// This is implemented step by step as described in the Referrer Policy
// specification, section 6.4 "Determine token's Policy".
if (content.LowerCaseEqualsLiteral(kRPS_Never) ||
content.LowerCaseEqualsLiteral(kRPS_No_Referrer)) {
return RP_No_Referrer;
}
if (content.LowerCaseEqualsLiteral(kRPS_Origin)) {
return RP_Origin;
}
if (content.LowerCaseEqualsLiteral(kRPS_Default) ||
content.LowerCaseEqualsLiteral(kRPS_No_Referrer_When_Downgrade)) {
return RP_No_Referrer_When_Downgrade;
}
if (content.LowerCaseEqualsLiteral(kRPS_Origin_When_Cross_Origin) ||
content.LowerCaseEqualsLiteral(kRPS_Origin_When_Crossorigin)) {
return RP_Origin_When_Crossorigin;
}
if (content.LowerCaseEqualsLiteral(kRPS_Always) ||
content.LowerCaseEqualsLiteral(kRPS_Unsafe_URL)) {
return RP_Unsafe_URL;
}
// Spec says if none of the previous match, use No_Referrer.
return RP_No_Referrer;
}
inline bool
IsValidReferrerPolicy(const nsAString& content)
{
return content.LowerCaseEqualsLiteral(kRPS_Never)
|| content.LowerCaseEqualsLiteral(kRPS_No_Referrer)
|| content.LowerCaseEqualsLiteral(kRPS_Origin)
|| content.LowerCaseEqualsLiteral(kRPS_Default)
|| content.LowerCaseEqualsLiteral(kRPS_No_Referrer_When_Downgrade)
|| content.LowerCaseEqualsLiteral(kRPS_Origin_When_Cross_Origin)
|| content.LowerCaseEqualsLiteral(kRPS_Origin_When_Crossorigin)
|| content.LowerCaseEqualsLiteral(kRPS_Always)
|| content.LowerCaseEqualsLiteral(kRPS_Unsafe_URL);
}
inline bool
IsValidAttributeReferrerPolicy(const nsAString& aContent)
{
// Spec allows only these three policies at the moment
// See bug 1178337
return aContent.LowerCaseEqualsLiteral(kRPS_No_Referrer)
|| aContent.LowerCaseEqualsLiteral(kRPS_Origin)
|| aContent.LowerCaseEqualsLiteral(kRPS_Unsafe_URL);
}
inline ReferrerPolicy
AttributeReferrerPolicyFromString(const nsAString& aContent)
{
// if the referrer attribute string is empty, return RP_Unset
if (aContent.IsEmpty()) {
return RP_Unset;
}
// if the referrer attribute string is not empty and contains a valid
// referrer policy, return the according enum value
if (IsValidAttributeReferrerPolicy(aContent)) {
return ReferrerPolicyFromString(aContent);
}
// in any other case the referrer attribute contains an invalid
// policy value, we thus return RP_No_Referrer
return RP_No_Referrer;
}
} // namespace net
} // namespace mozilla
#endif