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README2.md

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Go Bitcoin tutorial based on Mixin Network : Receive and send Bitcoin in Mixin Messenger

cover In the previous chapter, we created our first app, when user sends "Hello,world!", the bot reply the same message.

main.go

package main

import (
	"context"
	"encoding/base64"
	"encoding/json"
	"log"
	"github.com/MooooonStar/mixin-sdk-go/messenger"
	mixin "github.com/MooooonStar/mixin-sdk-go/network"
)

type Listener struct {
	*messenger.Messenger
}

// interface to implement if you want to handle the message
func (l *Listener) OnMessage(ctx context.Context, msg messenger.MessageView, userId string) error {
	data, err := base64.StdEncoding.DecodeString(msg.Data)
	if err != nil {
		return err
	}
	if msg.Category == "SYSTEM_ACCOUNT_SNAPSHOT" {
		var transfer messenger.TransferView
		if err := json.Unmarshal(data, &transfer); err != nil {
			return err
		}
		log.Println("I got a coin: ", transfer.Amount)
		mixin.Transfer(msg.UserId,transfer.Amount,transfer.AssetId,"",messenger.UuidNewV4().String(),
									PinCode,PinToken,UserId,SessionId,PrivateKey)
		return nil
		// return l.SendPlainText(ctx, msg.ConversationId, msg.UserId, string(data))
	} else if msg.Category == "PLAIN_TEXT" {
		log.Printf("I got a message, it said: %s", string(data))
		if string(data) == "g" {
			payLinkEOS := "https://mixin.one/pay?recipient=" +
							 msg.UserId  + "&asset=" +
							 "6cfe566e-4aad-470b-8c9a-2fd35b49c68d"   +
							 "&amount=" + "0.1" +
							 "&trace="  + messenger.UuidNewV4().String() +
							 "&memo="
		  payLinkBTC := "https://mixin.one/pay?recipient=" +
							 msg.UserId  + "&asset=" +
							 "c6d0c728-2624-429b-8e0d-d9d19b6592fa"   +
							 "&amount=" + "0.001" +
							 "&trace="  + messenger.UuidNewV4().String() +
							 "&memo="
		  log.Println(payLinkBTC)
			BtnEOS := messenger.Button{Label: "Pay EOS 0.1", Color: "#0080FF", Action: payLinkEOS}
			BtnBTC := messenger.Button{Label: "Pay BTC 0.001", Color: "#00FF80", Action: payLinkBTC}
			if err := l.SendAppButtons(ctx, msg.ConversationId, msg.UserId, BtnEOS, BtnBTC); err != nil {
				return err
			}
			return nil
		} else if string(data) == "a"  {
			card := messenger.AppCard{Title: "CNB", Description: "Chui Niu Bi", Action: "http://www.google.cn",
				IconUrl: "https://images.mixin.one/0sQY63dDMkWTURkJVjowWY6Le4ICjAFuu3ANVyZA4uI3UdkbuOT5fjJUT82ArNYmZvVcxDXyNjxoOv0TAYbQTNKS=s128"}
			if err := l.SendAppCard(ctx, msg.ConversationId, msg.UserId, card); err != nil {
				return err
			}
			return nil
		} else if string(data) == "r" {
			mixin.Transfer(msg.UserId,"0.0001","c6d0c728-2624-429b-8e0d-d9d19b6592fa","",messenger.UuidNewV4().String(),
										PinCode,PinToken,UserId,SessionId,PrivateKey)
			return nil
		} else { return l.SendPlainText(ctx, msg.ConversationId, msg.UserId, string(data)) }
	} else {
		log.Println("Unknown message!", msg.Category)
		return err
	}
}
const (
	UserId    = "21042518-85c7-4903-bb19-f311813d1f51"
	PinCode   = "911424"
	SessionId = "4267b63d-3daa-449e-bc13-970aa0357776"
	PinToken  = "gUUxpm3fPRVkKZNwA/gk10SHHDtR8LmxO+N6KbsZ/jymmwwVitUHKgLbk1NISdN8jBvsYJgF/5hbkxNnCJER5XAZ0Y35gsAxBOgcFN8otsV6F0FAm5TnWN8YYCqeFnXYJnqmI30IXJTAgMhliLj7iZsvyY/3htaHUUuN5pQ5F5s="
	//please delele the blank of PrivateKey the before each line
	PrivateKey = `-----BEGIN RSA PRIVATE KEY-----
MIICXQIBAAKBgQCDXiWJRLe9BzPtXmcVe6acaFTY9Ogb4Hc2VHFjKFsp7QRVCytx
3KC/LRojTFViwwExaANTZQ6ectwpAxIvzeYeHDZCXCh6JRFIYK/ZuREmYPcPQEWD
s92Tv/4XTAdTH8l9UJ4VQY4zwqYMak237N9xEvowT0eR8lpeJG0jAjN97QIDAQAB
AoGADvORLB1hGCeQtmxvKRfIr7aEKak+HaYfi1RzD0kRjyUFwDQkPrJQrVGRzwCq
GzJ8mUXwUvaGgmwqOJS75ir2DL8KPz7UfgQnSsHDUwKqUzULgW6nd/3OdDTYWWaN
cDjbkEpsVchOpcdkywvZhhyGXszpM20Vr8emlBcFUOTfpTUCQQDVVjkeMcpRsImV
U3tPYyiuqADhBTcgPBb+Ownk/87jyKF1CZOPvJAebNmpfJP0RMxUVvT4B9/U/yxZ
WNLhLtCXAkEAnaOEuefUxGdE8/55dUTEb7xrr22mNqykJaax3zFK+hSFBrM3gUY5
fEETtHnl4gEdX4jCPybRVc1JSFY/GWoyGwJBAKoLti95JHkErEXYavuWYEEHLNwv
mgcZnoI6cOKVfEVYEEoHvhTeCkoWHVDZOd2EURIQ1eY18JYIZ0M4Z66R8DUCQCsK
iKTR3dA6eiM8qiEQw6nWgniFscpf3PnCx/Iu3U/m5mNr743GhM+eXSj7136b209I
YfEoQiPxRz8O/W+NBV0CQQDVPNqJlFD34MC9aQN42l3NV1hDsl1+nSkWkXSyhhNR
MpobtV1a7IgJGyt5HxBzgNlBNOayICRf0rRjvCdw6aTP
-----END RSA PRIVATE KEY-----`
)


func main() {
	ctx := context.Background()
	m := messenger.NewMessenger(UserId, SessionId, PrivateKey)
	//replace with your own listener
	//go m.Run(ctx, messenger.DefaultBlazeListener{})
	l := &Listener{m}
	go m.Run(ctx, l)
	select {}
}

Hello Bitcoin!

Build the bot and execute it in the project directory.

cd mixin_labs-go-bot
go build
./mixin_labs-go-bot

Developer can send Bitcoin to their bots in message panel. The bot receive the Bitcoin and then send back immediately. transfer and tokens

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

Source code summary

if msg.Category == "SYSTEM_ACCOUNT_SNAPSHOT" {
  var transfer messenger.TransferView
  if err := json.Unmarshal(data, &transfer); err != nil {
    return err
  }
  log.Println("I got a coin: ", transfer.Amount)
  mixin.Transfer(msg.UserId,transfer.Amount,transfer.AssetId,"",messenger.UuidNewV4().String(),
                PinCode,PinToken,UserId,SessionId,PrivateKey)
  return nil
  // return l.SendPlainText(ctx, msg.ConversationId, msg.UserId, string(data))
}

Call mixin.Transfer to refund the coins back to user.

Advanced usage

APP_BUTTON_GROUP

In some payment scenario, for example: The coin exchange provides coin-exchange service which transfer BTC to EOS ETH, BCH etc, you want show the clients many pay links with different amount, APP_BUTTON_GROUP can help you here.

payLinkEOS := "https://mixin.one/pay?recipient=" +
         msg.UserId  + "&asset=" +
         "6cfe566e-4aad-470b-8c9a-2fd35b49c68d"   +
         "&amount=" + "0.1" +
         "&trace="  + messenger.UuidNewV4().String() +
         "&memo="
payLinkBTC := "https://mixin.one/pay?recipient=" +
         msg.UserId  + "&asset=" +
         "c6d0c728-2624-429b-8e0d-d9d19b6592fa"   +
         "&amount=" + "0.001" +
         "&trace="  + messenger.UuidNewV4().String() +
         "&memo="
log.Println(payLinkBTC)
BtnEOS := messenger.Button{Label: "Pay EOS 0.1", Color: "#0080FF", Action: payLinkEOS}
BtnBTC := messenger.Button{Label: "Pay BTC 0.001", Color: "#00FF80", Action: payLinkBTC}
if err := l.SendAppButtons(ctx, msg.ConversationId, msg.UserId, BtnEOS, BtnBTC); err != nil {
  return err
}

Here show clients two buttons for EOS and BTC, you can add more buttons in this way.

APP_CARD

Maybe a group of buttons too simple for you, try a pay link which show a icon: APP_CARD.

card := messenger.AppCard{Title: "CNB", Description: "Chui Niu Bi", Action: "http://www.google.cn",
  IconUrl: "https://images.mixin.one/0sQY63dDMkWTURkJVjowWY6Le4ICjAFuu3ANVyZA4uI3UdkbuOT5fjJUT82ArNYmZvVcxDXyNjxoOv0TAYbQTNKS=s128"}
if err := l.SendAppCard(ctx, msg.ConversationId, msg.UserId, card); err != nil {
  return err
}

APP_CARD

Full source code