add RemoteClusterTransportInterceptor interface

Author: slobodanadamovic

x-pack/plugin/security/src/main/java/org/elasticsearch/xpack/security/transport/RemoteClusterTransportInterceptor.java

@@ -0,0 +1,42 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0; you may not use this file except in compliance with the Elastic License
+ * 2.0.
+ */
+
+package org.elasticsearch.xpack.security.transport;
+
+import org.elasticsearch.action.support.DestructiveOperations;
+import org.elasticsearch.transport.Transport;
+import org.elasticsearch.transport.TransportInterceptor;
+import org.elasticsearch.xpack.core.ssl.SslProfile;
+
+import java.util.Map;
+
+/**
+ * Allows to provide remote cluster interception that's capable of intercepting remote connections
+ * both on the receiver and the sender side.
+ */
+public interface RemoteClusterTransportInterceptor {
+
+    /**
+     * Allows to intercept all transport requests on the sender side.
+     */
+    TransportInterceptor.AsyncSender interceptSender(TransportInterceptor.AsyncSender sender);
+
+    /**
+     * Returns {@code true} if the {@code connection} is targeting a remote cluster.
+     */
+    boolean isRemoteClusterConnection(Transport.Connection connection);
+
+    /**
+     * Allows providing custom {@link ServerTransportFilter} implementations per transport "profile".
+     * The transport filter is called on the receiver side to filter incoming requests.
+     */
+    Map<String, ServerTransportFilter> getProfileFilters(
+        Map<String, SslProfile> profileConfigurations,
+        DestructiveOperations destructiveOperations
+    );
+
+}