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/*
 * Copyright (C) 2016 Square, Inc.
 *
 * 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 okhttp3.internal.platform;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.List;
import javax.annotation.Nullable;
import javax.net.ssl.SSLParameters;
import javax.net.ssl.SSLSocket;
import javax.net.ssl.SSLSocketFactory;
import javax.net.ssl.X509TrustManager;
import okhttp3.Protocol;

import static okhttp3.internal.Util.assertionError;

/**
 * OpenJDK 9+.
 */
final class Jdk9Platform extends Platform {
  final Method setProtocolMethod;
  final Method getProtocolMethod;

  Jdk9Platform(Method setProtocolMethod, Method getProtocolMethod) {
    this.setProtocolMethod = setProtocolMethod;
    this.getProtocolMethod = getProtocolMethod;
  }

  @Override
  public void configureTlsExtensions(SSLSocket sslSocket, String hostname,
      List protocols) {
    try {
      SSLParameters sslParameters = sslSocket.getSSLParameters();

      List names = alpnProtocolNames(protocols);

      setProtocolMethod.invoke(sslParameters,
          new Object[] {names.toArray(new String[names.size()])});

      sslSocket.setSSLParameters(sslParameters);
    } catch (IllegalAccessException | InvocationTargetException e) {
      throw assertionError("unable to set ssl parameters", e);
    }
  }

  @Override
  public @Nullable String getSelectedProtocol(SSLSocket socket) {
    try {
      String protocol = (String) getProtocolMethod.invoke(socket);

      // SSLSocket.getApplicationProtocol returns "" if application protocols values will not
      // be used. Observed if you didn't specify SSLParameters.setApplicationProtocols
      if (protocol == null || protocol.equals("")) {
        return null;
      }

      return protocol;
    } catch (InvocationTargetException e) {
      if (e.getCause() instanceof UnsupportedOperationException) {
        // Handle UnsupportedOperationException as it is defined in the getApplicationProtocol API.
        // https://docs.oracle.com/javase/9/docs/api/javax/net/ssl/SSLSocket.html
        return null;
      }

      throw assertionError("failed to get ALPN selected protocol", e);
    } catch (IllegalAccessException e) {
      throw assertionError("failed to get ALPN selected protocol", e);
    }
  }

  @Override public X509TrustManager trustManager(SSLSocketFactory sslSocketFactory) {
    // Not supported due to access checks on JDK 9+:
    // java.lang.reflect.InaccessibleObjectException: Unable to make member of class
    // sun.security.ssl.SSLSocketFactoryImpl accessible:  module java.base does not export
    // sun.security.ssl to unnamed module @xxx
    throw new UnsupportedOperationException(
        "clientBuilder.sslSocketFactory(SSLSocketFactory) not supported on JDK 9+");
  }

  public static Jdk9Platform buildIfSupported() {
    // Find JDK 9 new methods, also present on JDK8 after build 252.
    try {
      Method setProtocolMethod =
          SSLParameters.class.getMethod("setApplicationProtocols", String[].class);
      Method getProtocolMethod = SSLSocket.class.getMethod("getApplicationProtocol");

      return new Jdk9Platform(setProtocolMethod, getProtocolMethod);
    } catch (NoSuchMethodException ignored) {
      // pre JDK 9
    }

    return null;
  }
}