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package enkan.component.builtin;

import enkan.component.ComponentLifecycle;
import enkan.component.SystemComponent;
import enkan.exception.MisconfigurationException;

import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import javax.xml.bind.DatatypeConverter;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;

/**
 * @author kawasima
 */
public class HmacEncoder extends SystemComponent {
    private String algorithm = "HmacSHA256";
    private String secret = "This is secret";

    private SecretKeySpec secretKeySpec;

    public HmacEncoder() {
        createKeySpec();
    }

    public String encodeToHex(String text) {
        try {
            Mac mac = Mac.getInstance(algorithm);
            mac.init(secretKeySpec);
            byte[] macBytes = mac.doFinal(text.getBytes());
            return DatatypeConverter.printHexBinary(macBytes);
        } catch (NoSuchAlgorithmException ex) {
            throw new MisconfigurationException("core.NO_SUCH_ALGORITHM", algorithm, "`HmacMD5`, `HmacSHA1`, and `HmacSHA256`",ex);
        } catch (InvalidKeyException ex) {
            throw new MisconfigurationException("core.INVALID_KEY", secretKeySpec, ex);
        }

    }

    @Override
    protected ComponentLifecycle lifecycle() {
        return new ComponentLifecycle() {
            @Override
            public void start(HmacEncoder component) {

            }

            @Override
            public void stop(HmacEncoder component) {

            }
        };
    }

    private void createKeySpec() {
        secretKeySpec = new SecretKeySpec(secret.getBytes(), algorithm);
    }

    public void setAlgorithm(String algorithm) {
        this.algorithm = algorithm;
        createKeySpec();
    }

    public void setSecret(String secret) {
        this.secret = secret;
        createKeySpec();
    }
}