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cover In last chapter, we create our first app.

Receive and send Bitcoin in Mixin Messenger

Your bot can receive Bitcoin from user and then pay it back immediately after read the chapter.

Prepare AES key

Now you need to fill some missing parameters in the config.js file.

The config.js file has been created in last chapter.

Now we will introduce a tool to generate the aes key.

install command line tool(mixin-cli) and generate a config.js file

open terminal and download tools by yarn

cd mixin_net-nodejs-bot2
yarn add mixin-cli

Execute it by argument dapp:config

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

As you see,"Press to launch your preferred editor.",for example, on my computer, it will open vim.

Now you need to copy all the generated session info in dashboard paste into vim, save and quit! generated session paste-to-vim

One config file will be generated in current folder. config_mixin_1546851899846.js is generated on my laptop.

$ ./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

The content of generated config.js is

// 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-----`,
};

You need copy missing content from config.js which is generated in last chapter into the config_mixin_1xx.js. Now we rename the file from config_mixin_1xx.js to config2.js:

A full config2.js example

We also create a app2.js file with following content.

Hello Bitcoin

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);
}

Generate payment URL and refund it to user

User can pay 0.001 Bitcoin to bot by click the button and the 0.001 Bitcoin will be refunded in 1 seconds,In fact, user can pay any coins. pay-link

Developer can send token to their bots in message panel. The bot send token back immediately after receive it. transfer and tokens

Source code summary

app2.js

//define acceptable actions
const ValidActions = ["ACKNOWLEDGE_MESSAGE_RECEIPT" ,"CREATE_MESSAGE", "LIST_PENDING_MESSAGES"];

create a payment link to user when user send 'pay' to bot

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!");
}
  • jsData.amount is negative if bot sends token to user successfully.
  • jsData.amount is positive if bot receives token from user.

Full app2.js is here