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package com.aliyuncs.v5.auth;

import java.io.UnsupportedEncodingException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;

import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import javax.xml.bind.DatatypeConverter;

public class HmacSHA1Signer extends Signer {

    public static final String ENCODING = "UTF-8";
    private static final String ALGORITHM_NAME = "HmacSHA1";

    @Override
    public String signString(String stringToSign, String accessKeySecret) {
        try {
            Mac mac = Mac.getInstance(ALGORITHM_NAME);
            mac.init(new SecretKeySpec(accessKeySecret.getBytes(ENCODING), ALGORITHM_NAME));
            byte[] signData = mac.doFinal(stringToSign.getBytes(ENCODING));
            return DatatypeConverter.printBase64Binary(signData);
        } catch (NoSuchAlgorithmException e) {
            throw new IllegalArgumentException(e.toString());
        } catch (UnsupportedEncodingException e) {
            throw new IllegalArgumentException(e.toString());
        } catch (InvalidKeyException e) {
            throw new IllegalArgumentException(e.toString());
        }
    }

    @Override
    public String signString(String stringToSign, AlibabaCloudCredentials credentials) {
        return signString(stringToSign, credentials.getAccessKeySecret());
    }

    @Override
    public String getSignerName() {
        return "HMAC-SHA1";
    }

    @Override
    public String getSignerVersion() {
        return "1.0";
    }

    @Override
    public String getSignerType() {
        return null;
    }
}