pco/sp-server/src/main/java/com/pj/api/jh/utils/MerchantApiUtil.java

package com.pj.api.jh.utils;

import cn.hutool.core.util.StrUtil;
import cn.hutool.crypto.SecureUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;

import java.util.Map;
import java.util.SortedMap;
import java.util.TreeMap;

/**
 * Created with IntelliJ IDEA.
 *
 * @Auther: lzm
 */
@Component
@Slf4j
public class MerchantApiUtil {

    /**
     * 获取参数签名
     *
     * @param paramMap  签名参数
     * @param paySecret 签名密钥
     * @return
     */
    public static String getSign(Map<String, Object> paramMap, String paySecret) {
        SortedMap<String, Object> smap = new TreeMap<String, Object>(paramMap);
        if (smap.get("sign") != null) {
            smap.remove("sign");
        }
        StringBuilder stringBuffer = new StringBuilder();
        for (Map.Entry<String, Object> m : smap.entrySet()) {
            Object value = m.getValue();
            if (value != null && StrUtil.isNotBlank(String.valueOf(value))) {
                stringBuffer.append(m.getKey()).append("=").append(value).append("&");
            }
        }
        stringBuffer.delete(stringBuffer.length() - 1, stringBuffer.length());
        String argPreSign = stringBuffer.append("&paySecret=").append(paySecret).toString();
        log.info("待签名数据:" + argPreSign);
        return SecureUtil.md5(argPreSign).toUpperCase();
    }

    /**
     * 验证商户签名
     *
     * @param paramMap  签名参数
     * @param paySecret 签名私钥
     * @param signStr   原始签名密文
     * @return
     */
    public static boolean isRightSign(Map<String, Object> paramMap, String paySecret, String signStr) {

        if (StrUtil.isBlank(signStr)) {
            return false;
        }

        String sign = getSign(paramMap, paySecret);
        if (signStr.equals(sign)) {
            return true;
        } else {
            return false;
        }
    }

}