MD5.java

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;
    }
}