/* 以下是若干用于測試HTTPS通訊的網頁地址：

https://www.verisign.com/ 
https://happiness.dhs.org/ 
https://www.microsoft.com 
https://www.sun.com 
https://www.ftc.gov 


*/


import java.net.*;
import javax.net.*;
import java.io.*;
import javax.net.ssl.*;
import java.security.cert.*;
import java.util.*;
import java.math.*;
import java.security.*;



public class t {
  public static void main(String args[ ])throws Exception {
   CertificateFactory cf = CertificateFactory.getInstance("X.509");
try {
        // Create the client socket
        int port = 443;
//        String hostname = "www.microsoft.com"; //not all server could use https

        String hostname =args[0];
        SSLSocketFactory factory = HttpsURLConnection.getDefaultSSLSocketFactory();
        SSLSocket socket = (SSLSocket)factory.createSocket(hostname, port);
    
        // Connect to the server
        socket.startHandshake();
    
        // Retrieve the server's certificate chain
        java.security.cert.Certificate[] serverCerts =
            socket.getSession().getPeerCertificates();
	System.out.println(serverCerts.length);
        List mylist = new ArrayList();
        for(int i=0;i<serverCerts.length-1;i++){
                mylist.add((X509Certificate)serverCerts[i]);

        }
        CertPath cp = cf.generateCertPath(mylist);
                System.out.println("aaaaaaaaaaaaaaaaaaaaa");
                System.out.println(cp);
                System.out.println("bbbbbbbbbbbbbbbbbbbbbb");


    TrustAnchor anchor = new TrustAnchor((X509Certificate)serverCerts[serverCerts.length-1],null);
    System.out.println(serverCerts[serverCerts.length-1]);
    PKIXParameters params = new PKIXParameters(Collections.singleton(anchor));
    params.setRevocationEnabled(false);


       //     CertPathValidator cpv = CertPathValidator.getInstance("PKIX");
    CertPathValidator cpv
            = CertPathValidator.getInstance(CertPathValidator.getDefaultType());
        
        try {
                 PKIXCertPathValidatorResult result =
                     (PKIXCertPathValidatorResult) cpv.validate(cp, params);
                 PolicyNode policyTree = result.getPolicyTree();
                 PublicKey subjectPublicKey = result.getPublicKey();
                 System.out.println("Certificate validated");
                 System.out.println("Policy Tree:\n" + policyTree);
                 System.out.println("Subject Public key:\n" +subjectPublicKey);

             } catch (CertPathValidatorException cpve) {
                 System.out.println("Validation failure, cert[" 
                     + cpve.getIndex() + "] :" + cpve.getMessage());
             }

     
        // Close the socket
        socket.close();
    } catch (SSLPeerUnverifiedException e) {
          System.out.println(e);
    } catch (IOException e) {
         System.out.println(e);
    }
  }



}