第二课 一步一步教你用 Node.js 收发比特币

在 上一篇教程中, 我们创建了自动回复消息的机器人。

按本篇教程后学习后完成后，你的机器人将能够知道自己收到比特币，然后立即转比特币给用户。

在开始之前， 开发者需要准备一些 config.js 的必备参数。

用 mixin-cli 工具生成 AES key

如果你看过 python,javascript 或 php 的代码，你会发现在这没有 Pin token 选项，这会有一个 AES key 来替代它。

安装一个工具 mixin-cli，用它来生成 config.js

cd mixin_net-nodejs-bot2
yarn add mixin-cli

下面将介绍一个工具来生成 AES key,还记得 Mixin.one 控制面板生成的数据吗？ 从 mixin.one 的开发者中心，点击"Click to generate a new session",拷贝新生成的所有数据 Mixin.one Dashboard

然后在终端里执行 mixin dapp:config dapp:config 是参数

wenewzha:mixin_network-nodejs-bot wenewzhang$ ./node_modules/mixin-cli/bin/mixin dapp:config
? What is the DAPP session info Press <enter> to launch your preferred editor.

如你所见，按"回车"将打开默认的编辑器，比如在我的电脑上，是打开 vim, 粘贴剪切版里的数据，然后保存并退出。 https://github.com/wenewzhang/mixin_network-nodejs-bot2/blob/master/paste-to-vim.png

回车三次，就产生了一个临时文件，比如 config_mixin_1546851899846.js

wenewzha:mixin_network-nodejs-bot wenewzhang$ ./node_modules/mixin-cli/bin/mixin dapp:config
? What is the DAPP session info Received
? Which config format do you prefer? [Plain Javascript] can be required from any js code
? What is the filename for generated config file config_mixin_1546851899846.js
✔︎ sessionInfo was successfully decoded!
✔︎ Config file written to /Users/wenewzhang/Documents/sl/mixin_network-nodejs-bot/config_mixin_1546851899846.js
✔︎ Press ctrl+v and then enter to view file content

生成的 config_mixin_1546851899846.js 如下：

// Generated with awesome https://github.com/wangshijun/mixin-cli
module.exports = {
  clientId: '<PUT YOUR DAPP CLIENT_ID HERE>',
  clientSecret: '<PUT YOUR DAPP CLIENT_SECRET HERE>',
  assetPin: '762835',
  sessionId: '4ec58515-814f-421c-844d-8717696cf460',
  aesKey: 'jqZvcLnlqt73TsSWHLezKNjdIdWBZ/rqTQLJlT1BlRQ=',
  privateKey: `-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----`,
};

你还需要补充以下数据（ clientID,clientSecret)才是一个完整的 config.js; 或者 只需要拷出 aesKey 替换你原来的 config.js.

• clientId 在 dashboard 可以找到
• clientSecret 左 dashboard 点击 "Click to generate a new secret"生成一个！
• aesKey 我们新生成的数据 将它放入到正式的 config.js 里

一个完整的 config.js 例子如下： here

Hello world，币来了!

我们再创建一个 app2.js 内容如下:

app2.js

const { SocketClient, isMessageType } = require('mixin-node-client');
const { HttpClient } = require('mixin-node-client');
const config = require('./config2');
const client = new SocketClient(config);

const ValidActions = ["ACKNOWLEDGE_MESSAGE_RECEIPT" ,"CREATE_MESSAGE", "LIST_PENDING_MESSAGES"];

const receiverID = "0b4f49dc-8fb4-4539-9a89-fb3afc613747";
const coinID = "6cfe566e-4aad-470b-8c9a-2fd35b49c68d";

console.log('Supported MessageSenders by SocketClient', client.getMessageSenders());
console.log(client.getMessageSenders());
// Listen and react to socket messages
client.on(
  'message',
  client.getMessageHandler(message => {
    console.log('Message Received', message);
    if (ValidActions.indexOf(message.action) > -1) {
      if (message.action === 'ACKNOWLEDGE_MESSAGE_RECEIPT') {console.log("ignore receipt");return;}

      if (isMessageType(message, 'text')) {
        console.log('----------------------text-------------------------');
        const text = message.data.data.toLowerCase();
        if ( (message.data.category === "PLAIN_TEXT") && (message.action === "CREATE_MESSAGE") ) {
          var parameter4IncomingMsg = {"message_id":message.data.message_id, "status":"READ"};
          var RspMsg = {"id":client.getUUID(), "action":"ACKNOWLEDGE_MESSAGE_RECEIPT", "params":parameter4IncomingMsg};
          client.sendRaw(RspMsg);

          if (text === 'pay') {
            let payLink = "https://mixin.one/pay?recipient=" +
              config.clientId + "&asset=" +
              "6cfe566e-4aad-470b-8c9a-2fd35b49c68d" +
              "&amount=0.01" + '&trace=' + client.getUUID() +
              "&memo=";
            return client.sendButton({
                label: 'pay 0.01 EOS',
                color: '#FF0000',
                action: payLink,
              },
              message
            );
          }

    // todo: catch a error when balance insufficient
    //       (node:55535) UnhandledPromiseRejectionWarning: Error: Insufficient balance.
    // at HttpClient.(anonymous function) [as createTransfer] (/Users/wenewzhang/Documents/sl/mixin_network-nodejs-bot2/node_modules/mixin-node-client/lib/http.js:99:23)
    // at process.internalTickCallback (internal/process/next_tick.js:77:7)
          if (text === 'refund') {
            asyncRefundCall(coinID,'0.00001',receiverID);
          }
          return client.sendText( message.data.data, message);
        }
      }
      if (message.data && message.data.category === "SYSTEM_ACCOUNT_SNAPSHOT") {
          console.log("-----------the bot got money!---------------");

          var jsData = JSON.parse(Buffer.from(message.data.data, 'base64').toString('utf-8'));
          console.log(jsData);

//let the server know that i have read this message
          var parameter4IncomingMsg = {"message_id":message.data.message_id, "status":"READ"};
          var RspMsg = {"id":client.getUUID(), "action":"ACKNOWLEDGE_MESSAGE_RECEIPT", "params":parameter4IncomingMsg};
          client.sendRaw(RspMsg);

          if (jsData.amount > 0) {
            //refund immediately
            asyncRefundCall(jsData.asset_id,jsData.amount,jsData.opponent_id);
          } else console.log("refund success!");
          console.log("-----------end of bot got money!---------------");
      }
      return Promise.resolve(message);
  } else console.log("unknow action")
  }));

client.on('error', err => console.error(err.message));

function refundInstant(_assetID,_amount,_opponent_id) {
  return new Promise(resolve => {
    var httpClient = new HttpClient(config);
    const Obj = {
      assetId: _assetID,
      recipientId: _opponent_id,
        traceId: httpClient.getUUID(),
        amount: _amount,
        memo: '',
    };
    console.log('resolve...');
    console.log(Obj);
    console.log("end of Obj");
    httpClient.transferFromBot(Obj);
  })
}
async function asyncRefundCall(_assetID,_amount,_opponent_id) {
  console.log('calling asyncCall');
  var result = await refundInstant(_assetID,_amount,_opponent_id);
  console.log(result);
}

源代码解释

app2.js

//定义可用的消息名称
const ValidActions = ["ACKNOWLEDGE_MESSAGE_RECEIPT" ,"CREATE_MESSAGE", "LIST_PENDING_MESSAGES"];

创建一个支付链接，响应用户的pay指令

if (text === 'pay') {
  let payLink = "https://mixin.one/pay?recipient=" +
    config.clientId + "&asset=" +
    "6cfe566e-4aad-470b-8c9a-2fd35b49c68d" +
    "&amount=0.01" + '&trace=' + client.getUUID() +
    "&memo=";
  return client.sendButton({
      label: 'pay 0.01 EOS',
      color: '#FF0000',
      action: payLink,
    },
    message
  );
}

用户点击链接，依提示在 Mixin Messenger 里支付,支付后机器人会马上转回给用户，如下图: https://github.com/wenewzhang/mixin_network-nodejs-bot2/blob/master/pay-link.png 开发者可以支付任意的币给机器人，机器人在收到币后，立即转回给开发者! https://github.com/wenewzhang/mixin_network-nodejs-bot2/blob/master/transfer-any-tokens.jpg

操作如下图所示： https://github.com/wenewzhang/mixin_network-nodejs-bot2/blob/master/pay-refund.jpeg

源代码解释

app2.js

//定义可接受的消息
const ValidActions = ["ACKNOWLEDGE_MESSAGE_RECEIPT" ,"CREATE_MESSAGE", "LIST_PENDING_MESSAGES"];

用户发送 'pay' 指令后，机器人发回一个 payment 的链接

if (text === 'pay') {
  let payLink = "https://mixin.one/pay?recipient=" +
    config.clientId + "&asset=" +
    "6cfe566e-4aad-470b-8c9a-2fd35b49c68d" +
    "&amount=0.01" + '&trace=' + client.getUUID() +
    "&memo=";
  return client.sendButton({
      label: 'pay 0.01 EOS',
      color: '#FF0000',
      action: payLink,
    },
    message
  );
}

if (message.data && message.data.category === "SYSTEM_ACCOUNT_SNAPSHOT") {
    var jsData = JSON.parse(Buffer.from(message.data.data, 'base64').toString('utf-8'));
//let the server know that i have read this message
    var parameter4IncomingMsg = {"message_id":message.data.message_id, "status":"READ"};
    var RspMsg = {"id":client.getUUID(), "action":"ACKNOWLEDGE_MESSAGE_RECEIPT", "params":parameter4IncomingMsg};
    client.sendRaw(RspMsg);
    if (jsData.amount > 0) {
      //refund immediately
      asyncRefundCall(jsData.asset_id,jsData.amount,jsData.opponent_id);
    } else console.log("refund success!");
}

如果机器人收到币，jsData.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 jsData.amount 是一个负数.

完整的例子请点击