Bug 1494476 - Part 0: Add the HasUserInteraction function r=baku

Differential Revision: https://phabricator.services.mozilla.com/D8238

--HG--
extra : moz-landing-system : lando

toolkit/components/antitracking/AntiTrackingCommon.cpp

@@ -1228,3 +1228,21 @@ AntiTrackingCommon::StoreUserInteractionFor(nsIPrincipal* aPrincipal)
             _spec), uri);
   cc->SendStoreUserInteractionAsPermission(IPC::Principal(aPrincipal));
 }
+
+/* static */ bool
+AntiTrackingCommon::HasUserInteraction(nsIPrincipal* aPrincipal)
+{
+  nsCOMPtr<nsIPermissionManager> pm = services::GetPermissionManager();
+  if (NS_WARN_IF(!pm)) {
+    return false;
+  }
+
+  uint32_t result = 0;
+  nsresult rv =
+    pm->TestPermissionFromPrincipal(aPrincipal, USER_INTERACTION_PERM, &result);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return false;
+  }
+
+  return result == nsIPermissionManager::ALLOW_ACTION;
+}

toolkit/components/antitracking/AntiTrackingCommon.h

@@ -111,6 +111,9 @@ public:
   static void
   StoreUserInteractionFor(nsIPrincipal* aPrincipal);
 
+  static bool
+  HasUserInteraction(nsIPrincipal* aPrincipal);
+
   // For IPC only.
   static void
   SaveFirstPartyStorageAccessGrantedForOriginOnParentProcess(nsIPrincipal* aPrincipal,