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README2-zhchs.md

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上一篇教程中, 我们创建了自动回复消息的机器人,当用户发送消息"Hello,World!"时,机器人会自动回复同一条消息!

第二课: 机器人接受比特币并立即退还用户

按本篇教程后学习后完成后,你的机器人将会接受用户发送过来的加密货币,然后立即转回用户。 在App.java中,找到"switch",加入新的"CASE",内容如下:

App.java

switch (category) {
...
case SYSTEM_ACCOUNT_SNAPSHOT:
    userId =
      obj.get("data").getAsJsonObject().get("user_id").getAsString();
    byte[] JsData = Base64.decodeBase64(obj.get("data").getAsJsonObject().get("data").getAsString());
    String JsStr = new String(JsData);
    System.out.println("SYSTEM_ACCOUNT_SNAPSHOT json: " + JsStr);
    JsonObject jsObj = new JsonParser().parse(JsStr).getAsJsonObject();
    System.out.println(jsObj.get("amount").getAsString());
    System.out.println(jsObj.get("asset_id").getAsString());
    if (jsObj.get("amount").getAsFloat() > 0) {
      String aesKey = new String (Base64.encodeBase64(Config.PAY_KEY));
      System.out.println(aesKey);
      System.out.println(Config.PAY_KEY.length);
      String encryptPin = MixinUtil.encryptPayKey(Config.PIN,Config.PAY_KEY);
      MixinBot.transfer(
          jsObj.get("asset_id").getAsString(),
          jsObj.get("opponent_id").getAsString(),
          jsObj.get("amount").getAsString(),
          encryptPin,
          Config.RSA_PRIVATE_KEY,
          Config.CLIENT_ID,
          Config.SESSION_ID
      );
    }
    break;
...

Hello Bitcoin!

在项目目录下,执行 **gradle run **

response:Response{protocol=http/1.1, code=101, message=Switching Protocols, url=https://blaze.mixin.one/}
[onMessage !!!]
json: {"id":"712fbde1-1b72-4e8f-b731-b7dc6f689c3e","action":"LIST_PENDING_MESSAGES"}
LIST_PENDING_MESSAGES
<=========----> 75% EXECUTING [13s]
> :run

开发者可以通过消息面板,给机器人转比特币,当机器人收到比特币后,马上返还给用户! transfer and tokens

事实上,用户可以发送任意的币种给机器人,它都能马上返还! pay-link

源代码解释

if (jsObj.get("amount").getAsFloat() > 0) {
  String encryptPin = MixinUtil.encryptPayKey(Config.PIN,Config.PAY_KEY);
  MixinBot.transfer(
      jsObj.get("asset_id").getAsString(),
      jsObj.get("opponent_id").getAsString(),
      jsObj.get("amount").getAsString(),
      encryptPin,
      Config.RSA_PRIVATE_KEY,
      Config.CLIENT_ID,
      Config.SESSION_ID
  );
}

如果机器人收到币,jsObj.get("amount") 大于零;如果机器人支付币给用户,接收到的消息是一样的,唯一不同的是jsObj.get("amount")是一个负数. 最后一步,调用SDK的MixinBot.transfer将币返还用户!

高级用法

在某些应用场景,开发者想引导用户来支付币给机器人,Mixin Network提供了很多种方法。

sendAppCard

发送一张带有标题,描述的图标,用户点击图标然后支付给机器人。 Send a icon with title and description, user click the icon to pay coins to bot

if (msgP.toLowerCase().equals("pay")) {
  MixinBot.sendAppCard(webSocket,
                      Config.CLIENT_ID,
                      "6cfe566e-4aad-470b-8c9a-2fd35b49c68d",
                      "0.0001",
                      conversationId);
}

send Button Group

创建一组按钮,用户点击任意一个按钮然后支付给机器人。

else if (msgP.toLowerCase().equals("appsgroup")) {
  String payLinkEOS = "https://mixin.one/pay?recipient=" +
                 Config.CLIENT_ID  + "&asset=" +
                 "6cfe566e-4aad-470b-8c9a-2fd35b49c68d"   +
                 "&amount=" + "0.1" +
                 "&trace="  + UUID.randomUUID().toString() +
                 "&memo=";
  JsonObject msgJsEOS = new JsonObject();
  msgJsEOS.addProperty("label", "Pay 0.1 EOS");
  msgJsEOS.addProperty("color", "#0080FF");
  msgJsEOS.addProperty("action",payLinkEOS);


  String payLinkBTC = "https://mixin.one/pay?recipient=" +
                 Config.CLIENT_ID  + "&asset=" +
                 "c6d0c728-2624-429b-8e0d-d9d19b6592fa"   +
                 "&amount=" + "0.001" +
                 "&trace="  + UUID.randomUUID().toString() +
                 "&memo=";
  JsonObject msgJsBTC = new JsonObject();
  msgJsBTC.addProperty("label", "Pay 0.001 BTC");
  msgJsBTC.addProperty("color", "#FF8000");
  msgJsBTC.addProperty("action",payLinkBTC);

  JsonArray msgArr = new JsonArray();
  msgArr.add(msgJsEOS);//button for EOS
  msgArr.add(msgJsBTC);//button for Bitcoin

  JsonObject msgParams = new JsonObject();
  msgParams.addProperty("conversation_id",conversationId);
  msgParams.addProperty("category","APP_BUTTON_GROUP");
  msgParams.addProperty("status","SENT");
  msgParams.addProperty("message_id",UUID.randomUUID().toString());
  msgParams.addProperty("data",new String(Base64.encodeBase64(msgArr.toString().getBytes())));

  MixinBot.send(webSocket, MIXIN_Action.CREATE_MESSAGE, msgParams.toString());
}

pay-link