package org.jivesoftware.util.cert;

import java.security.cert.X509Certificate;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * Certificate identity mapping that uses the CommonName as the
 * identity credentials
 * 
 * @author Victor Hong
 *
 */
public class CNCertificateIdentityMapping implements CertificateIdentityMapping {

	private static Pattern cnPattern = Pattern.compile("(?i)(cn=)([^,]*)");
	
	/**
	 * Maps certificate CommonName as identity credentials
	 * 
	 * @param certificate
	 * @return A List of names.
	 */
	@Override
	public List<String> mapIdentity(X509Certificate certificate) {
        String name = certificate.getSubjectDN().getName();
        Matcher matcher = cnPattern.matcher(name);
        // Create an array with the detected identities
        List<String> names = new ArrayList<>();
        while (matcher.find()) {
            names.add(matcher.group(2));
        }
		
		return names;
	}

	/**
	 * Returns the short name of mapping
	 * 
	 * @return The short name of the mapping
	 */
	@Override
	public String name() {
		return "Common Name Mapping";
	}

}
