content: /*
   * Copyright (C) 2010 The Android Open Source Project
   *
   * 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 android.net;
  
  import android.annotation.UnsupportedAppUsage;
  import android.content.Context;
  import android.util.Log;
  
  import com.android.org.conscrypt.ClientSessionContext;
  import com.android.org.conscrypt.FileClientSessionCache;
  import com.android.org.conscrypt.SSLClientSessionCache;
  
  import java.io.File;
  import java.io.IOException;
  
  import javax.net.ssl.SSLContext;
  import javax.net.ssl.SSLSessionContext;
  
  /**
   * File-based cache of established SSL sessions.  When re-establishing a
   * connection to the same server, using an SSL session cache can save some time,
   * power, and bandwidth by skipping directly to an encrypted stream.
   * This is a persistent cache which can span executions of the application.
   *
   * @see SSLCertificateSocketFactory
   */
  public final class SSLSessionCache {
      private static final String TAG = "SSLSessionCache";
      @UnsupportedAppUsage
      /* package */ final SSLClientSessionCache mSessionCache;
  
      /**
       * Installs a {@link SSLSessionCache} on a {@link SSLContext}. The cache will
       * be used on all socket factories created by this context (including factories
       * created before this call).
       *
       * @param cache the cache instance to install, or {@code null} to uninstall any
       *         existing cache.
       * @param context the context to install it on.
       * @throws IllegalArgumentException if the context does not support a session
       *         cache.
       *
       * @hide candidate for public API
       */
      public static void install(SSLSessionCache cache, SSLContext context) {
          SSLSessionContext clientContext = context.getClientSessionContext();
          if (clientContext instanceof ClientSessionContext) {
              ((ClientSessionContext) clientContext).setPersistentCache(
                      cache == null ? null : cache.mSessionCache);
          } else {
              throw new IllegalArgumentException("Incompatible SSLContext: " + context);
          }
      }
  
      /**
       * NOTE: This needs to be Object (and not SSLClientSessionCache) because apps
       * that build directly against the framework (and not the SDK) might not declare
       * a dependency on conscrypt. Javac will then has fail while resolving constructors.
       *
       * @hide For unit test use only
       */
      public SSLSessionCache(Object cache) {
          mSessionCache = (SSLClientSessionCache) cache;
      }
  
      /**
       * Create a session cache using the specified directory.
       * Individual session entries will be files within the directory.
       * Multiple instances for the same directory share data internally.
       *
       * @param dir to store session files in (created if necessary)
       * @throws IOException if the cache can't be opened
       */
      public SSLSessionCache(File dir) throws IOException {
          mSessionCache = FileClientSessionCache.usingDirectory(dir);
      }
  
      /**
       * Create a session cache at the default location for this app.
       * Multiple instances share data internally.
       *
       * @param context for the application
       */
      public SSLSessionCache(Context context) {
          File dir = context.getDir("sslcache", Context.MODE_PRIVATE);
          SSLClientSessionCache cache = null;
          try {
              cache = FileClientSessionCache.usingDirectory(dir);
          } catch (IOException e) {
              Log.w(TAG, "Unable to create SSL session cache in " + dir, e);
          }
          mSessionCache = cache;
      }
  }
  