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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) [2020] Payara Foundation and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://github.com/payara/Payara/blob/main/LICENSE.txt
 * See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at glassfish/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * The Payara Foundation designates this particular file as subject to the "Classpath"
 * exception as provided by the Payara Foundation in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 *
 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
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 */
package fish.payara.microprofile.config.extensions.aws.client;

import static jakarta.xml.bind.DatatypeConverter.printHexBinary;

import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.TimeZone;

import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;

import com.nimbusds.jose.util.StandardCharset;

public abstract class AuthUtils {

    private AuthUtils() {

    }

    /**
     * Generate Hex code of String.
     *
     * @param data
     * @return
     */
    protected static String generateHex(String data) {
        MessageDigest messageDigest;
        try {
            messageDigest = MessageDigest.getInstance("SHA-256");
            messageDigest.update(data.getBytes(StandardCharset.UTF_8));
            byte[] digest = messageDigest.digest();
            return String.format("%064x", new BigInteger(1, digest));
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * Convert byte array to Hex. This method is kept here to facilitate the unit test
     *
     * @param bytes
     * @return
     */
    protected static String bytesToHex(byte[] bytes) {
        return printHexBinary(bytes).toLowerCase();
    }

    /**
     * Apply HmacSHA256 on data using given key.
     *
     * @param data
     * @param key
     * @return
     * @throws Exception
     * @reference:
     * http://docs.aws.amazon.com/general/latest/gr/signature-v4-examples.html#signature-v4-examples-java
     */
    protected static byte[] HmacSHA256(byte[] key, String data) throws Exception {
        String algorithm = "HmacSHA256";
        Mac mac = Mac.getInstance(algorithm);
        mac.init(new SecretKeySpec(key, algorithm));
        return mac.doFinal(data.getBytes(StandardCharset.UTF_8));
    }

    /**
     * Generate AWS signature key.
     *
     * @param key
     * @param date
     * @param regionName
     * @param serviceName
     * @return
     * @throws Exception
     * @reference
     * http://docs.aws.amazon.com/general/latest/gr/signature-v4-examples.html#signature-v4-examples-java
     */
    protected static byte[] getSignatureKey(String key, String date, String regionName, String serviceName) throws Exception {
        byte[] kSecret = ("AWS4" + key).getBytes(StandardCharset.UTF_8);
        byte[] kDate = HmacSHA256(kSecret, date);
        byte[] kRegion = HmacSHA256(kDate, regionName);
        byte[] kService = HmacSHA256(kRegion, serviceName);
        byte[] kSigning = HmacSHA256(kService, "aws4_request");
        return kSigning;
    }

    /**
     * Get timestamp. yyyyMMdd'T'HHmmss'Z'
     *
     * @return
     */
    protected static String getTimestamp(Date date) {
        DateFormat dateFormat = new SimpleDateFormat("yyyyMMdd'T'HHmmss'Z'");
        dateFormat.setTimeZone(TimeZone.getTimeZone("UTC"));// server timezone
        return dateFormat.format(date);
    }
    
}