XRP-离线签名

这篇文章使用xrp测试环境实现以下功能：
1.xrp离线签名交易；
2.xrp充值；
3.xrp生成秘钥对（要自己搭建xrp节点,测试网无法调用生成秘钥对的方法）；
4.xrp查询余额

1.maven
首先要下载：ripple-bouncycastle和ripple-core两个jar包，导入本地仓库。
可以到github下载编译
或者，直接下载

        
            com.ripple
            ripple-bouncycastle
            1.0.0
        
        
            com.ripple
            ripple-core
            1.0.0
        

2.代码：

import java.io.IOException;
import java.math.BigDecimal;
import java.util.*;

import com.warrior.utils.HttpUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.util.StringUtils;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;
import com.ripple.core.coretypes.AccountID;
import com.ripple.core.coretypes.Amount;
import com.ripple.core.coretypes.uint.UInt32;
import com.ripple.core.types.known.tx.signed.SignedTransaction;
import com.ripple.core.types.known.tx.txns.Payment;

 
public class XrpApi {

    private static Logger logger = LoggerFactory.getLogger(XrpApi.class);
    private String postUrl = "https://s.altnet.rippletest.net:51234";

    private final static String RESULT = "result";
    private final static String SUCCESS = "success";
    private final static String TES_SUCCESS = "tesSUCCESS";

    private final static String METHOD_POST_ACCOUNT_INFO = "account_info";
    private final static String METHOD_POST_SUBMIT = "submit";

    public XrpApi() {
    }


    public XrpApi(String postUrl) {
        this.postUrl = postUrl;
    }

    /**
     * 广播交易
     *
     * @return
     */
    public String pushTx(String sign) throws Exception {
        if (StringUtils.isEmpty(sign)) {
            logger.error("签名失败:{}");
            return null;
        }
        HashMap params = new HashMap();
        params.put("tx_blob", sign);
        //签名
        JSONObject json = doRequest(METHOD_POST_SUBMIT, params);
        if (!isError(json)) {
            JSONObject result = json.getJSONObject(RESULT);
            if (result != null) {
                String engine_result = result.getString("engine_result");
                String engine_result_message = result.getString("engine_result_message");
                if (TES_SUCCESS.equals(engine_result)) {
                    String hash = result.getJSONObject("tx_json").getString("hash");
                    if (!StringUtils.isEmpty(hash)) {
                        logger.info("转账成功：hash:{}", hash);
                        return hash;
                    } else {
                        logger.error("转账失败：hash:{}", hash);
                    }
                } else   {
                   throw new Exception(engine_result_message);
                }
            }
        }
        return null;
    }

    /**
     * 签名
     *
     * @param value
     * @return tx_blob
     */
    public String sign(String fromAddress, String privateKey, String toAddress, Long value, Long fee, String memo) {
        Map map = getAccountInfo(fromAddress);
        Payment payment = new Payment();
        payment.as(AccountID.Account, fromAddress);
        payment.as(AccountID.Destination, toAddress);
        payment.as(UInt32.DestinationTag, memo);
        payment.as(Amount.Amount, value.toString());
        payment.as(UInt32.Sequence, map.get("accountSequence"));
        payment.as(UInt32.LastLedgerSequence, map.get("ledgerCurrentIndex") + 4);
        payment.as(Amount.Fee, fee.toString());
        SignedTransaction signed = payment.sign(privateKey);
        if (signed != null) {
            return signed.tx_blob;
        }
        return null;
    }


    public Map getAccountInfo(String account) {
        HashMap params = new HashMap();
        params.put("account", account);
        params.put("strict", "true");
        params.put("ledger_index", "current");
        params.put("queue", "true");
        JSONObject re = doRequest(METHOD_POST_ACCOUNT_INFO, params);
        if (re != null) {
            JSONObject result = re.getJSONObject("result");
            if (SUCCESS.equals(result.getString("status"))) {
                Map map = new HashMap();
                map.put("accountSequence", result.getJSONObject("account_data").getString("Sequence"));
                map.put("balance", result.getJSONObject("account_data").getString("Balance"));
                map.put("ledgerCurrentIndex", result.getString("ledger_current_index"));
                return map;
            }
        }
        return null;
    }


    private boolean isError(JSONObject json) {
        if (json == null || (!StringUtils.isEmpty(json.getString("error")) && json.get("error") != "null")) {
            return true;
        }
        return false;
    }

    private JSONObject doRequest(String method, Object... params) {
        JSONObject param = new JSONObject();
        param.put("id", System.currentTimeMillis() + "");
        param.put("jsonrpc", "2.0");
        param.put("method", method);
        if (params != null) {
            param.put("params", params);
        }
       /* String creb = Base64.encodeBase64String((address+":"+password).getBytes());
        Map headers = new HashMap<>(2);
        headers.put("Authorization","Basic "+creb);*/
        String resp = "";
        try {
            resp = HttpUtil.jsonPost(postUrl, param.toJSONString());
        } catch (Exception e) {
            logger.info(e.getMessage());
            if (e instanceof IOException) {
                resp = "{}";
            }
        }
        logger.info(resp);
        return JSON.parseObject(resp);
    }


    /**
     * 充值
     *
     * @param accounts
     */
    public void recharge(List accounts) {
        for (String account : accounts) {
            JSONObject jsonObject = account_tx(account);
            System.out.println(jsonObject);
            JSONObject resultJson = jsonObject.getJSONObject("result");
            if (resultJson == null) {
                continue;
            }
            JSONArray jsonArray = resultJson.getJSONArray("transactions");
            for (int i = 0; i < jsonArray.size(); i++) {
                JSONObject transaction = (JSONObject) jsonArray.get(i);
                JSONObject txJson = transaction.getJSONObject("tx");
                Object validated = transaction.get("validated");
                String from = txJson.get("Account").toString();
                String to = txJson.get("Destination").toString();
                String transactionType = txJson.get("TransactionType").toString();
                String amount = txJson.get("Amount").toString();
                String fee = txJson.get("Fee").toString();
                Object destinationTag = txJson.get("DestinationTag");
                String hash = txJson.get("hash").toString();
                logger.info("from:{},to:{},amount:{},hash:{},destinationTag:{}", from, to, amount, hash, destinationTag);
            }
        }
    }

    public JSONObject account_tx(String account) {
        HashMap params = new HashMap();
        params.put("account", account);
        params.put("binary", false);
        params.put("forward", false);//false代表获取最新的
        params.put("ledger_index_max", -1);
        params.put("ledger_index_min", -1);
        params.put("limit", 100);
        params.put("marker", 15725839);
        return doRequest("account_tx", params);
    }

    public BigDecimal unitToMax(Long number) {
        return new BigDecimal(number).divide(BigDecimal.valueOf(1000000), 6, BigDecimal.ROUND_HALF_UP);
    }

    public Long unitToMini(BigDecimal number) {
        return number.multiply(BigDecimal.valueOf(1000000)).setScale(6, BigDecimal.ROUND_HALF_UP).longValue();
    }


    //创建秘钥对
    public void createKey() {
        JSONObject jsonObject = doRequest("wallet_propose", new HashMap<>());
        System.out.println(jsonObject);
    }

    //=========================

    public static void main(String[] args) {
        XrpApi xrpApi = new XrpApi("https://s.altnet.rippletest.net:51234");


        //1.转账
/*        String fromAddress = "rfbg6ozE1Mak8iH8H54ovVVXBCprSxm4zE";
        String fromPrivateKey = "snqxtNkDrzw8Zf8nGu6B3DdQXJgfD";
        String toAddress = "rDsd6zh5xArehnq9RNZETTpSr3MFJ39eqL";
        BigDecimal amount = BigDecimal.valueOf(10000);
        BigDecimal fee = BigDecimal.valueOf(0.0001);
        String memo = "123456";//只能是数值
        String sign = xrpApi.sign(fromAddress, fromPrivateKey, toAddress, xrpApi.unitToMini(amount), xrpApi.unitToMini(fee), memo);
        System.out.println(sign);
        String txid = null;
        try {
            txid = xrpApi.pushTx(sign);
        } catch (Exception e) {
            System.out.println(e.getMessage());
            e.printStackTrace();
        }
        System.out.println("txid:" + txid);*/


        //2.充值
/*        List accounts = new ArrayList<>();
        accounts.add("rDsd6zh5xArehnq9RNZETTpSr3MFJ39eqL");
        xrpApi.recharge(accounts);*/


        //3.生成秘钥对
/*        xrpApi = new XrpApi("http://218.17.133.218:7777");
        xrpApi.createKey();*/


        //4.查询余额
        Map accountInfoMap = xrpApi.getAccountInfo("rfbg6ozE1Mak8iH8H54ovVVXBCprSxm4zE");
        Long v = Long.valueOf(accountInfoMap.get("balance").toString());
        System.out.println(xrpApi.unitToMax(v));

    }


}