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A Java Utils Libraray By Geewit

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package com.aliyun.openservices.ons.api.impl.authority;

import com.aliyun.openservices.shade.com.alibaba.rocketmq.remoting.protocol.RemotingCommand;

import java.util.SortedMap;

import static com.aliyun.openservices.ons.api.impl.authority.SessionCredentials.CHARSET;


public class AuthUtil {
    public static byte[] combineRequestContent(RemotingCommand request, SortedMap fieldsMap) {
        try {
            StringBuilder sb = new StringBuilder();
            fieldsMap.forEach((key, value) -> {
                if (!SessionCredentials.Signature.equals(key)) {
                    sb.append(value);
                }
            });

            return AuthUtil.combineBytes(sb.toString().getBytes(CHARSET), request.getBody());
        } catch (Exception e) {
            throw new RuntimeException("incompatible exception.", e);
        }
    }


    public static byte[] combineBytes(byte[] b1, byte[] b2) {
        int size = (null != b1 ? b1.length : 0) + (null != b2 ? b2.length : 0);
        byte[] total = new byte[size];
        if (null != b1) {
            System.arraycopy(b1, 0, total, 0, b1.length);
        }
        if (null != b1 && null != b2) {
                System.arraycopy(b2, 0, total, b1.length, b2.length);
        }
        return total;
    }


    public static String calSignature(byte[] data, String secretKey) {
        String signature = OnsAuthSigner.calSignature(data, secretKey);
        return signature;
    }
}