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+/* 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/. */
+
+#include "nsISupports.idl"
+
+/**
+ * Observer for exception list updates.
+ */
+[scriptable, function, uuid(f7c918e5-94bf-4b6e-9758-ef7bdab6af7e)]
+interface nsIUrlClassifierExceptionListObserver : nsISupports
+{
+ /**
+ * Called by nsIUrlClassifierExceptionListService when the exception list
+ * for a designated feature changes and when the observer is first registered.
+ *
+ * @param aList
+ * A comma-separated list of url patterns, intended to be parsed
+ * by nsContentUtils::IsURIInList.
+ */
+ void onExceptionListUpdate(in ACString aList);
+};
+
+/**
+ * A service that monitors updates to the exception list of url-classifier
+ * feature from sources such as a local pref and remote settings updates.
+ */
+[scriptable, uuid(75c3d1a3-e977-4079-9e27-b3b56bdb76ea)]
+interface nsIUrlClassifierExceptionListService : nsISupports
+{
+ /**
+ * Register a new observer to exception list updates. When the observer is
+ * registered it is called immediately once. Afterwards it will be called
+ * whenever the specified pref changes or when remote settings for
+ * url-classifier features updates.
+ *
+ * @param aFeature
+ * The feature for which to observe the exception list.
+ *
+ * @param aPrefName
+ * (Optional) A pref name to monitor. The pref must be of string
+ * type and contain a comma-separated list of URL patterns.
+ *
+ * @param aObserver
+ * An nsIUrlClassifierExceptionListObserver object or function that
+ * will receive updates to the exception list as a comma-separated
+ * string. Will be called immediately with the current exception
+ * list value.
+ */
+ void registerAndRunExceptionListObserver(in ACString aFeature,
+ in ACString aPrefName,
+ in nsIUrlClassifierExceptionListObserver aObserver);
+
+ /**
+ * Unregister an observer.
+ *
+ * @param aFeature
+ * The feature for which to stop observing.
+ *
+ * @param aObserver
+ * The nsIUrlClassifierExceptionListObserver object to unregister.
+ */
+ void unregisterExceptionListObserver(in ACString aFeature,
+ in nsIUrlClassifierExceptionListObserver aObserver);
+
+ /**
+ * Clear all data in the service.
+ * This API is for testing only.
+ */
+ void clear();
+};