POST\n
/v3/marketing/favor/media/image-upload\n
1739854234\n
aa3ea8f02276438b90a63cfeea0d5c56\n\n

这个签名串计算出的签名值能通过签名校验

POST\n
/v3/marketing/favor/media/image-upload\n
1739854337\n
b08f3dcc57664f308d76615e17766826\n
{"filename":"50d23bdcab1242b68f49e64d41439844.png","sha256":"cfbf7c2a60d18cb397b3ff8155abb04271aea8361feb55ec1a59d76adcdc53b9"}\n

这个按照文档中给的签名串构建计算出的签名通过不了签名校验

{"code":"SIGN_ERROR","detail":{"detail":{"issue":"sign not match"},"field":"signature","location":"authorization","sign_information":{"method":"POST","sign_message_length":89,"truncated_sign_message":"POST\n/v3/marketing/favor/media/image-upload\n1739854337\nb08f3dcc57664f308d76615e17766826\n\n","url":"/v3/marketing/favor/media/image-upload"}},"message":"错误的签名，验签失败"}

  //计算文件摘要
        String sha256 = DigestUtils.sha256Hex(imageBytes);
        System.out.println("SHA-256: " + sha256);
        //构建签名串
        String timestamp = String.valueOf(System.currentTimeMillis() / 1000);
        String nonceStr = UUID.randomUUID().toString().replaceAll("-", "");
        Map<String, String> dataMap = new HashMap<>();
        dataMap.put("filename", newFileName);
        dataMap.put("sha256",sha256);
        ObjectMapper objectMapper = new ObjectMapper();
        String jsonBody = objectMapper.writeValueAsString(dataMap); 
        System.out.println("jsonBody:"+jsonBody.toString());
        //生成签名串signatureStr
        String signatureStr = buileSignature("POST",apiurl,timestamp,nonceStr,jsonBody);
//        String signatureStr = buileSignature("POST",apiurl,timestamp,nonceStr);
        System.out.println("signatureStr:"+signatureStr);
        //计算签名值
        String sign = createSign(signatureStr);
        System.out.println("sign:"+sign);

        //构造Authorization
        String authorization = String.format("WECHATPAY2-SHA256-RSA2048 mchid=\"%s\",nonce_str=\"%s\",timestamp=\"%s\",serial_no=\"%s\",signature=\"%s\"",
                mchId,
                nonceStr,
                timestamp,
                certSerialNo,  // 证书序列号
                sign);