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   /*
    * Copyright 2015 The Netty Project
    *
    * The Netty Project licenses this file to you 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:
    *
    *   https://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.netty.handler.ssl.util;
  
  import io.netty.util.internal.ObjectUtil;
  
  import javax.security.cert.CertificateException;
  import javax.security.cert.CertificateExpiredException;
  import javax.security.cert.CertificateNotYetValidException;
  import javax.security.cert.X509Certificate;
  import java.math.BigInteger;
  import java.security.InvalidKeyException;
  import java.security.NoSuchAlgorithmException;
  import java.security.NoSuchProviderException;
  import java.security.Principal;
  import java.security.PublicKey;
  import java.security.SignatureException;
  import java.util.Date;
  
  public final class LazyJavaxX509Certificate extends X509Certificate {
      private final byte[] bytes;
      private X509Certificate wrapped;
  
      /**
       * Creates a new instance which will lazy parse the given bytes. Be aware that the bytes will not be cloned.
       */
      public LazyJavaxX509Certificate(byte[] bytes) {
          this.bytes = ObjectUtil.checkNotNull(bytes, "bytes");
      }
  
      @Override
      public void checkValidity() throws CertificateExpiredException, CertificateNotYetValidException {
          unwrap().checkValidity();
      }
  
      @Override
      public void checkValidity(Date date) throws CertificateExpiredException, CertificateNotYetValidException {
          unwrap().checkValidity(date);
      }
  
      @Override
      public int getVersion() {
          return unwrap().getVersion();
      }
  
      @Override
      public BigInteger getSerialNumber() {
          return unwrap().getSerialNumber();
      }
  
      @Override
      public Principal getIssuerDN() {
          return unwrap().getIssuerDN();
      }
  
      @Override
      public Principal getSubjectDN() {
          return unwrap().getSubjectDN();
      }
  
      @Override
      public Date getNotBefore() {
          return unwrap().getNotBefore();
      }
  
      @Override
      public Date getNotAfter() {
          return unwrap().getNotAfter();
      }
  
      @Override
      public String getSigAlgName() {
          return unwrap().getSigAlgName();
      }
  
      @Override
      public String getSigAlgOID() {
          return unwrap().getSigAlgOID();
      }
  
      @Override
      public byte[] getSigAlgParams() {
          return unwrap().getSigAlgParams();
      }
  
      @Override
     public byte[] getEncoded() {
         return bytes.clone();
     }
 
     /**
      * Return the underyling {@code byte[]} without cloning it first. This {@code byte[]} <strong>must</strong> never
      * be mutated.
      */
     byte[] getBytes() {
         return bytes;
     }
 
     @Override
     public void verify(PublicKey key)
             throws CertificateException, NoSuchAlgorithmException, InvalidKeyException, NoSuchProviderException,
                    SignatureException {
         unwrap().verify(key);
     }
 
     @Override
     public void verify(PublicKey key, String sigProvider)
             throws CertificateException, NoSuchAlgorithmException, InvalidKeyException, NoSuchProviderException,
                    SignatureException {
         unwrap().verify(key, sigProvider);
     }
 
     @Override
     public String toString() {
         return unwrap().toString();
     }
 
     @Override
     public PublicKey getPublicKey() {
         return unwrap().getPublicKey();
     }
 
     private X509Certificate unwrap() {
         X509Certificate wrapped = this.wrapped;
         if (wrapped == null) {
             try {
                 wrapped = this.wrapped = X509Certificate.getInstance(bytes);
             } catch (CertificateException e) {
                 throw new IllegalStateException(e);
             }
         }
         return wrapped;
     }
 }