content: /*
   * Copyright 1999-2018 Alibaba Group Holding Ltd.
   *
   * 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 com.alibaba.nacos.common.tls;
  
  import com.alibaba.nacos.common.utils.IoUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import javax.net.ssl.SSLException;
  import javax.net.ssl.TrustManager;
  import javax.net.ssl.TrustManagerFactory;
  import javax.net.ssl.X509TrustManager;
  import java.io.FileInputStream;
  import java.io.InputStream;
  import java.security.KeyStore;
  import java.security.cert.Certificate;
  import java.security.cert.CertificateException;
  import java.security.cert.CertificateFactory;
  import java.security.cert.X509Certificate;
  import java.util.Collection;
  
  /**
   * A TrustManager tool returns the specified TrustManager.
   *
   * @author wangwei
   */
  public final class SelfTrustManager {
      
      private static final Logger LOGGER = LoggerFactory.getLogger(SelfTrustManager.class);
      
      @SuppressWarnings("checkstyle:WhitespaceAround")
      static TrustManager[] trustAll = new TrustManager[] {new X509TrustManager() {
          
          @Override
          public void checkClientTrusted(X509Certificate[] x509Certificates, String s) throws CertificateException {
          }
          
          @Override
          public void checkServerTrusted(X509Certificate[] x509Certificates, String s) throws CertificateException {
          }
          
          @Override
          public X509Certificate[] getAcceptedIssuers() {
              return null;
          }
      }};
      
      /**
       * Returns the result of calling {@link #buildSecureTrustManager} if {@code needAuth} is enable and {@code
       * trustCertPath} exists. Returns the {@link #trustAll} otherwise.
       *
       * @param needAuth      whether need client auth
       * @param trustCertPath trust certificate path
       * @return Array of {@link TrustManager }
       */
      public static TrustManager[] trustManager(boolean needAuth, String trustCertPath) {
          if (needAuth) {
              try {
                  return trustCertPath == null ? null : buildSecureTrustManager(trustCertPath);
              } catch (SSLException e) {
                  LOGGER.warn("degrade trust manager as build failed, " + "will trust all certs.");
                  return trustAll;
              }
          } else {
              return trustAll;
          }
      }
      
      private static TrustManager[] buildSecureTrustManager(String trustCertPath) throws SSLException {
          TrustManagerFactory selfTmf;
          InputStream in = null;
          
          try {
              String algorithm = TrustManagerFactory.getDefaultAlgorithm();
              selfTmf = TrustManagerFactory.getInstance(algorithm);
              
              KeyStore trustKeyStore = KeyStore.getInstance("JKS");
              trustKeyStore.load(null, null);
              
              in = new FileInputStream(trustCertPath);
              CertificateFactory cf = CertificateFactory.getInstance("X.509");
              
              Collection<X509Certificate> certs = (Collection<X509Certificate>) cf.generateCertificates(in);
              int count = 0;
              for (Certificate cert : certs) {
                  trustKeyStore.setCertificateEntry("cert-" + (count++), cert);
              }
              
              selfTmf.init(trustKeyStore);
              return selfTmf.getTrustManagers();
          } catch (Exception e) {
              LOGGER.error("build client trustManagerFactory failed", e);
              throw new SSLException(e);
          } finally {
              IoUtils.closeQuietly(in);
          }
      }
  }
  