/*
 * Copyright 2020 The gRPC Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package io.grpc.xds;

import io.grpc.Internal;
import io.grpc.xds.EnvoyServerProtoData.DownstreamTlsContext;
import io.grpc.xds.EnvoyServerProtoData.UpstreamTlsContext;
import io.grpc.xds.internal.security.SslContextProvider;

@Internal
public interface TlsContextManager {

  /** Creates a SslContextProvider. Used for retrieving a server-side SslContext. */
  SslContextProvider findOrCreateServerSslContextProvider(
      DownstreamTlsContext downstreamTlsContext);

  /** Creates a SslContextProvider. Used for retrieving a client-side SslContext. */
  SslContextProvider findOrCreateClientSslContextProvider(
      UpstreamTlsContext upstreamTlsContext);

  /**
   * Releases an instance of the given client-side {@link SslContextProvider}.
   *
   * <p>The instance must have been obtained from {@link #findOrCreateClientSslContextProvider}.
   * Otherwise will throw IllegalArgumentException.
   *
   * <p>Caller must not release a reference more than once. It's advised that you clear the
   * reference to the instance with the null returned by this method.
   */
  SslContextProvider releaseClientSslContextProvider(SslContextProvider sslContextProvider);

  /**
   * Releases an instance of the given server-side {@link SslContextProvider}.
   *
   * <p>The instance must have been obtained from {@link #findOrCreateServerSslContextProvider}.
   * Otherwise will throw IllegalArgumentException.
   *
   * <p>Caller must not release a reference more than once. It's advised that you clear the
   * reference to the instance with the null returned by this method.
   */
  SslContextProvider releaseServerSslContextProvider(SslContextProvider sslContextProvider);
}