package at.gv.egiz.asic.impl.verifier;

import at.gv.egiz.asic.impl.Verifier;
import at.gv.egovernment.moa.spss.api.cmsverify.VerifyCMSSignatureResponse;
import org.apache.commons.codec.binary.Hex;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;

/**
 * Created by Andreas Fitzek on 6/17/16.
 */
public abstract class BaseVerifier implements Verifier {

    protected static Map<String, String> hashTranslator = new HashMap<String, String>();

    static {
        hashTranslator.put("http://www.w3.org/2000/09/xmldsig#sha1", "SHA-1");
        hashTranslator.put("http://www.w3.org/2001/04/xmldsig-more#sha224", "SHA-224");
        hashTranslator.put("http://www.w3.org/2001/04/xmlenc#sha256", "SHA-256");
        hashTranslator.put("http://www.w3.org/2001/04/xmldsig-more#sha384", "SHA-384");
        hashTranslator.put("http://www.w3.org/2001/04/xmlenc#sha512", "SHA-512");
        hashTranslator.put("http://www.w3.org/2001/04/xmlenc#ripemd160", "RIPEMD-160");
    }

    private static final Logger logger = LoggerFactory.getLogger(BaseVerifier.class);

    protected boolean compareHash(byte[] reference, byte[] calculated, String refName) {
        String referenceHex = Hex.encodeHexString(reference);
        String calculatedHex = Hex.encodeHexString(calculated);
        if(Arrays.equals(reference, calculated)) {
            logger.debug("Digest from manifest do match for {}", refName);
            return true;
        } else {
            logger.info("Digest from manifest do not match for {}", refName);
            logger.info("Digest from manifest   for {} : {}", refName, referenceHex);
            logger.info("Digest from calculated for {} : {}", refName, calculatedHex);
            return false;
        }
    }

    protected MessageDigest getMessageDigestFromURI(String uri) {
        try {

            String algo = hashTranslator.get(uri);

            if(algo == null) {
                algo = uri;
            }

            return MessageDigest.getInstance(algo);
        } catch (NoSuchAlgorithmException e) {
            return null;
        }
    }
}