transfer token and send it back immediately

Author: wenewzhang

README.md

@@ -1,8 +1,8 @@
 # Step by step: How to use nodejs to create a bot in Mixin Messenger
-In this charpter, you can create a bot in Mixin Messenger to receive user message after you following the guide. In next chapter, your bot can receive token from user and pay token to user .
+In this chapter, you can create a bot in Mixin Messenger to receive user message after you following the guide. In next chapter, your bot can receive token from user and pay token to user .
 
 
-[Mixin Network](https://mixin.one) is a free and lightning fast peer-to-peer transactional network for digital assets. 
+[Mixin Network](https://mixin.one) is a free and lightning fast peer-to-peer transactional network for digital assets.
 
 These articles will show you how to write a bot in nodejs. The bot can receive and response to user's message. User can pay token to bot and bot can transfer token to user.
 
@@ -22,7 +22,7 @@ apt install node yarn
 ```
 
 
-### Create you first bot 
+### Create you first bot
 Before you write any code, you need to create an app by following [tutorial](https://mixin-network.gitbook.io/mixin-network/mixin-messenger-app/create-bot-account).
 
 write down three required infomations: user id, session id, private key, mixin-node sign the token with them.
@@ -149,3 +149,6 @@ install [Mixin Messenger](https://mixin.one/),add the bot as your friend,(for ex
 enjoy!
 
 ![mixin_messenger](https://github.com/wenewzhang/mixin_network-nodejs-bot2/blob/master/mixin_messenger-sayhi.png)
+
+
+##[Chapter 2: Receive and send token](https://github.com/wenewzhang/mixin_network-nodejs-bot2/blob/master/README2.md)

README2.md

@@ -1,9 +1,10 @@
-## Receive and send token
+# Chapter 2: Receive and send token
 In this chapter, the bot can receive token from user and then pay it back immediately, you must know the miss options in the config.js file,
 here show you how to generate a client secret, PIN, aesKey etc.
->if you had readed the python, javescript or php code, you should find this config.js doesn't have PIN token, yes, nodejs use PIN token generate aesKey,
+>if you have read the python, javescript or php code, you should find this config.js doesn't have PIN token, yes, nodejs use PIN token generate aesKey,
 >i show you how to do it
-### First, copy the PIN,session id,private key from [Mixin.one Dashboard](https://developers.mixin.one/dashboard)
+## First, generate a completely config.js
+copy the PIN,session id,private key etc. from [Mixin.one Dashboard](https://developers.mixin.one/dashboard)
 ![copy config info from dashboard](https://github.com/wenewzhang/mixin_network-nodejs-bot2/blob/master/copy-to-clipboard.png)
 
 ```bash
@@ -33,10 +34,55 @@ wenewzha:mixin_network-nodejs-bot wenewzhang$ ./node_modules/mixin-cli/bin/mixin
 ```
 | Key | Description                                  |   example                                         |
 | --- | -------------------------------------------- |  -------------------------------------------------
-| client secret  |                                        | 78ef86a80be17601f404ad643e5c85ed4f7f5f9f7a1597 |
+| client secret  | generate from mixin.one's dashboard   | 78ef86a80be17601f404ad643e5c85ed4f7f5f9f7a1597 |
 | PIN   |                 PIN code                       | 123456 |
 | PIN token |       verify/update PIN                        |     don't  need here                         |
 | aesKey | generate by PIN token                        |  GlJxnvlfhz7nxIk1eNkEdngf+jDW8XGHxJiaQTuD9v8=     |
-| clientSecret |   generate from mixin.one's dashboard  | 9873769d7b4198da2ee397af3ecaa87a5054a03d0114cedf28797567defa6fd8 |
 
+
+- **aesKey**  generate aesKey by mixin-cli tool
+- **client secret** don't forget generate client secret
 completely config.js can find [here](https://github.com/wenewzhang/mixin_network-nodejs-bot2/blob/master/config2.js)
+
+## Source code brief explanation
+> app2.js define acceptable actions
+```javascript
+const ValidActions = ["ACKNOWLEDGE_MESSAGE_RECEIPT" ,"CREATE_MESSAGE", "LIST_PENDING_MESSAGES"];
+```
+
+create a payment link to user when user ask 'pay'
+```javascript
+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
+  );
+}
+```
+you can pay 0.01 EOS to bot through pay command,
+![pay-link](https://github.com/wenewzhang/mixin_network-nodejs-bot2/blob/master/pay-link.png)
+otherwise, you can transfer any tokens to boy through message panel, the bot receive the tokens and then send back immediately.
+![transfer and tokens](https://github.com/wenewzhang/mixin_network-nodejs-bot2/blob/master/transfer-any-tokens.jpeg)
+
+```javascript
+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 readed 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!");
+}
+```
+if jsData.amount is negative, that's mean send the token back success!