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diff --git a/caps/NullPrincipal.h b/caps/NullPrincipal.h
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+/**
+ * This is the principal that has no rights and can't be accessed by
+ * anything other than itself and chrome; null principals are not
+ * same-origin with anything but themselves.
+ */
+
+#ifndef mozilla_NullPrincipal_h
+#define mozilla_NullPrincipal_h
+
+#include "nsIPrincipal.h"
+#include "nsJSPrincipals.h"
+#include "nsCOMPtr.h"
+
+#include "mozilla/BasePrincipal.h"
+#include "gtest/MozGtestFriend.h"
+
+class nsIDocShell;
+class nsIURI;
+namespace Json {
+class Value;
+}
+
+#define NS_NULLPRINCIPAL_CID \
+ { \
+ 0xbd066e5f, 0x146f, 0x4472, { \
+ 0x83, 0x31, 0x7b, 0xfd, 0x05, 0xb1, 0xed, 0x90 \
+ } \
+ }
+
+#define NS_NULLPRINCIPAL_SCHEME "moz-nullprincipal"
+
+namespace mozilla {
+
+class NullPrincipal final : public BasePrincipal {
+ public:
+ static PrincipalKind Kind() { return eNullPrincipal; }
+
+ NS_IMETHOD QueryInterface(REFNSIID aIID, void** aInstancePtr) override;
+ uint32_t GetHashValue() override;
+ NS_IMETHOD GetURI(nsIURI** aURI) override;
+ NS_IMETHOD GetIsOriginPotentiallyTrustworthy(bool* aResult) override;
+ NS_IMETHOD GetDomain(nsIURI** aDomain) override;
+ NS_IMETHOD SetDomain(nsIURI* aDomain) override;
+ NS_IMETHOD GetBaseDomain(nsACString& aBaseDomain) override;
+ NS_IMETHOD GetAddonId(nsAString& aAddonId) override;
+ NS_IMETHOD GetPrecursorPrincipal(nsIPrincipal** aPrecursor) override;
+
+ // Create a NullPrincipal, inheriting origin attributes from the given
+ // principal.
+ // If aInheritFrom is a content principal, or has a content principal
+ // precursor, it will be used as the precursor for this principal.
+ static already_AddRefed<NullPrincipal> CreateWithInheritedAttributes(
+ nsIPrincipal* aInheritFrom);
+
+ // Create a new NullPrincipal with the specified OriginAttributes.
+ //
+ // If `aNullPrincipalURI` is specified, it must be a NS_NULLPRINCIPAL_SCHEME
+ // URI previously created using `NullPrincipal::CreateURI`, and will be used
+ // as the origin URI for this principal.
+ static already_AddRefed<NullPrincipal> Create(
+ const OriginAttributes& aOriginAttributes,
+ nsIURI* aNullPrincipalURI = nullptr);
+
+ static already_AddRefed<NullPrincipal> CreateWithoutOriginAttributes();
+
+ // Generates a new unique `moz-nullprincipal:` URI. If `aPrecursor` is
+ // specified, it will be included in the generated URI as the null principal's
+ // precursor.
+ //
+ // The `aPrincipalID` attribute is used to force the creation of a
+ // deterministic NullPrincipal in situations where that is required. Avoid
+ // using this parameter unless absolutely necessary.
+ static already_AddRefed<nsIURI> CreateURI(nsIPrincipal* aPrecursor = nullptr,
+ const nsID* aPrincipalID = nullptr);
+
+ virtual nsresult GetScriptLocation(nsACString& aStr) override;
+
+ nsresult GetSiteIdentifier(SiteIdentifier& aSite) override {
+ aSite.Init(this);
+ return NS_OK;
+ }
+
+ virtual nsresult PopulateJSONObject(Json::Value& aObject) override;
+
+ // Serializable keys are the valid enum fields the serialization supports
+ enum SerializableKeys : uint8_t { eSpec = 0, eSuffix, eMax = eSuffix };
+ typedef mozilla::BasePrincipal::KeyValT<SerializableKeys> KeyVal;
+
+ static already_AddRefed<BasePrincipal> FromProperties(
+ nsTArray<NullPrincipal::KeyVal>& aFields);
+
+ class Deserializer : public BasePrincipal::Deserializer {
+ public:
+ NS_IMETHOD Read(nsIObjectInputStream* aStream) override;
+ };
+
+ protected:
+ NullPrincipal(nsIURI* aURI, const nsACString& aOriginNoSuffix,
+ const OriginAttributes& aOriginAttributes);
+
+ virtual ~NullPrincipal() = default;
+
+ bool SubsumesInternal(nsIPrincipal* aOther,
+ DocumentDomainConsideration aConsideration) override {
+ MOZ_ASSERT(aOther);
+ return FastEquals(aOther);
+ }
+
+ bool MayLoadInternal(nsIURI* aURI) override;
+
+ const nsCOMPtr<nsIURI> mURI;
+
+ private:
+ FRIEND_TEST(NullPrincipalPrecursor, EscapingRoundTrips);
+
+ static void EscapePrecursorQuery(nsACString& aPrecursorQuery);
+ static void UnescapePrecursorQuery(nsACString& aPrecursorQuery);
+};
+
+} // namespace mozilla
+
+#endif // mozilla_NullPrincipal_h