Test CAS Rest API from Java Code

Points To Remember

• Make sure that your CAS Server is up and running. How to set up CAS Rest api with JDBC Authentication.
• You have created a database and have dummy data in it.

Program : Test CAS Rest Api from a Java Code

You can use the following piece of code to test the CAS Rest API.

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLEncoder;

import javax.net.ssl.HttpsURLConnection;

public class TestCASRest {
  
 
 public static void main(String... args) throws Exception
 {
  String username ="ekansh@ekiras.com";
  String password ="password";
  validateFromCAS(username,password);
 }
 
 public static boolean validateFromCAS(String username, String password) throws Exception
 {
  
  String url = "https://ekansh:8443/cas/v1/tickets";
  try 
  {
   HttpsURLConnection hsu = (HttpsURLConnection)openConn(url);
   String s =   URLEncoder.encode("username","UTF-8") + "=" + URLEncoder.encode(username,"UTF-8");
   s+="&" +URLEncoder.encode("password","UTF-8") + "=" + URLEncoder.encode(password,"UTF-8");
   
   System.out.println("string s = "+s);
   OutputStreamWriter out = new OutputStreamWriter(hsu.getOutputStream());
   BufferedWriter bwr = new BufferedWriter(out); 
   bwr.write(s);
   bwr.flush();
   bwr.close();
   out.close();
   
   String tgt = hsu.getHeaderField("location");
   System.out.println( hsu.getResponseCode());
   if(tgt != null && hsu.getResponseCode() == 201)
   {
    System.out.println(tgt);
    
    System.out.println("Tgt is : " + tgt.substring( tgt.lastIndexOf("/") +1));
    tgt = tgt.substring( tgt.lastIndexOf("/") +1);
          bwr.close();
          closeConn(hsu);
          
          
          String serviceURL = "http://ekansh:8090/";
          String encodedServiceURL = URLEncoder.encode("service","utf-8") +"=" + URLEncoder.encode(serviceURL,"utf-8");
          System.out.println("Service url is : " + encodedServiceURL);
          
          
    
          String myURL = url+ "/"+ tgt ;
          System.out.println(myURL);
          hsu = (HttpsURLConnection)openConn(myURL);
          out = new OutputStreamWriter(hsu.getOutputStream());
    bwr = new BufferedWriter(out); 
    bwr.write(encodedServiceURL);
    bwr.flush();
    bwr.close();
    out.close();
          
          System.out.println("Response code is:  " + hsu.getResponseCode());
          
          BufferedReader isr = new BufferedReader(   new InputStreamReader(hsu.getInputStream()));
          String line;
          System.out.println( hsu.getResponseCode());
          while ((line = isr.readLine()) != null) {
           System.out.println( line);
          }
          isr.close();
          hsu.disconnect();
          return true;
          
      }
   else
   {
    return false;
   }
   
   
  }
  catch(MalformedURLException mue)
  {
   mue.printStackTrace();
   throw mue; 
    
  }
  catch(IOException ioe)
  {
   ioe.printStackTrace();
   throw ioe;
  }
  
  
  
  
  
 }
 
 
 static URLConnection openConn(String urlk)  throws MalformedURLException, IOException
 {
  
  URL url = new URL(urlk);
  HttpsURLConnection hsu = (HttpsURLConnection) url.openConnection();
  hsu.setDoInput(true);
  hsu.setDoOutput(true);
  hsu.setRequestMethod("POST");
  return hsu;
  
  
 }
 
 
 static void closeConn(HttpsURLConnection c)
 {
  c.disconnect();
 }
 
 
 }

You will get the following type of response if everything is working fine.

string s = username=admin%40gmail.com&password=igdefault
201
https://ekansh:8443/cas/v1/tickets/TGT-3-eeSgMb35iv3TkqYzqekyhjZcGyNwKKq2s94reeoRINtdKJBvjx-ekansh
Tgt is : TGT-3-eeSgMb35iv3TkqYzqekyhjZcGyNwKKq2s94reeoRINtdKJBvjx-ekansh
Service url is : service=http%3A%2F%2Fekansh%3A8090%2F
https://ekansh:8443/cas/v1/tickets/TGT-3-eeSgMb35iv3TkqYzqekyhjZcGyNwKKq2s94reeoRINtdKJBvjx-ekansh
Response code is:  200
200
ST-3-Uagfse2pVB7hR5GL09WB-ekansh

If the authentication fails at the server then you will get a response like the following

string s = username=ekansh%40ekiras.com&password=pwd
400

TGT - It is the token by the ticket granting token.
ST-3-Uagfse2pVB7hR5GL09WB-ekansh - It is the service token.