Tiktok Shop 生成signature（java）

因为tiktok官方文档生成signature只有go语言版本的

所以记录一下java版本生成tiktok shop 请求open api时需要的signature

源码

private String getSignature(String uri, Map<String, String> parametersMap, String appSecret) throws Exception {
        Map<String, String> tempParamsMap = new TreeMap<>(Comparator.naturalOrder());
        tempParamsMap.putAll(parametersMap);
        tempParamsMap.remove("sign");
        tempParamsMap.remove("access_token");
        StringBuilder input = new StringBuilder(uri);
        for (Map.Entry<String, String> entry : tempParamsMap.entrySet()) {
            input.append(entry.getKey()).append(entry.getValue());
        }
        input = new StringBuilder(appSecret + input + appSecret);
        return hmacSHA256(appSecret, input.toString());
    }

    /**
     * sha256_HMAC加密
     *
     * @param message 消息
     * @param secret  秘钥
     * @return 加密后字符串
     */
    public static String hmacSHA256(String secret, String message) throws Exception {
        Mac hmacSha256 = Mac.getInstance("HmacSHA256");
        SecretKeySpec secret_key = new SecretKeySpec(secret.getBytes(), "HmacSHA256");
        hmacSha256.init(secret_key);
        byte[] bytes = hmacSha256.doFinal(message.getBytes());
        StringBuilder hs = new StringBuilder();
        String stmp;
        for (int n = 0; bytes != null && n < bytes.length; n++) {
            stmp = Integer.toHexString(bytes[n] & 0XFF);
            if (stmp.length() == 1)
                hs.append('0');
            hs.append(stmp);
        }
        return hs.toString().toLowerCase();
    }