package kg.apc.jmeter.functions;

 import org.apache.jmeter.engine.util.CompoundVariable;

 import org.apache.jmeter.functions.AbstractFunction;

 import org.apache.jmeter.functions.InvalidVariableException;

 import org.apache.jmeter.samplers.SampleResult;

 import org.apache.jmeter.samplers.Sampler;

 import org.apache.jmeter.threads.JMeterVariables;

 import org.apache.jorphan.util.JOrphanUtils;

 import java.security.MessageDigest;

 import java.security.NoSuchAlgorithmException;

 import java.util.Collection;

 import java.util.LinkedList;

 import java.util.List;

 public class MD5 extends AbstractFunction {

     private static final List<String> desc = new LinkedList<String>();

     private static final String KEY = "__MD5";

     static {

         desc.add("String to calculate MD5 hash");

         desc.add("Name of variable in which to store the result (optional)");

     }

     private Object[] values;

     /**

      * No-arg constructor.

      */

     public MD5() {

     }

     /**

      * {@inheritDoc}

      */

     @Override

     public synchronized String execute(SampleResult previousResult, Sampler currentSampler)

             throws InvalidVariableException {

         JMeterVariables vars = getVariables();

         String str = ((CompoundVariable) values[0]).execute();

         MessageDigest digest;

         try {

             digest = MessageDigest.getInstance("md5");

         } catch (NoSuchAlgorithmException ex) {

             return "Error creating digest: " + ex;

         }

         String res = JOrphanUtils.baToHexString(digest.digest(str.getBytes()));

         if (vars != null && values.length > 1) {

             String varName = ((CompoundVariable) values[1]).execute().trim();

             vars.put(varName, res);

         }

         return res;

     }

     /**

      * {@inheritDoc}

      */

     @Override

     public synchronized void setParameters(Collection<CompoundVariable> parameters) throws InvalidVariableException {

         checkMinParameterCount(parameters, 1);

         values = parameters.toArray();

     }

     /**

      * {@inheritDoc}

      */

     @Override

     public String getReferenceKey() {

         return KEY;

     }

     /**

      * {@inheritDoc}

      */

     @Override

     public List<String> getArgumentDesc() {

         return desc;

     }

 }