Init

.gitignore

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+/node_modules
+/node_modules/*

app.js

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+/**
+ * ⚡⚡⚡ DECLARAMOS LAS LIBRERIAS y CONSTANTES A USAR! ⚡⚡⚡
+ */
+const fs = require('fs');
+const mimeDb = require('mime-db')
+const express = require('express');
+const moment = require('moment');
+const ora = require('ora');
+const chalk = require('chalk');
+const ExcelJS = require('exceljs');
+const qrcode = require('qrcode-terminal');
+const { flowConversation } = require('./conversation')
+const { Client, MessageMedia } = require('whatsapp-web.js');
+const app = express();
+app.use(express.urlencoded({ extended: true }))
+const SESSION_FILE_PATH = './session.json';
+let client;
+let sessionData;
+
+/**
+ * Guardamos archivos multimedia que nuestro cliente nos envie!
+ * @param {*} media 
+ */
+const saveMedia = (media) => {
+
+    const extensionProcess = mimeDb[media.mimetype]
+    const ext = extensionProcess.extensions[0]
+    fs.writeFile(`./media/${media.filename}.${ext}`, media.data, { encoding: 'base64' }, function (err) {
+        console.log('** Archivo Media Guardado **');
+    });
+}
+
+/**
+ * Enviamos archivos multimedia a nuestro cliente
+ * @param {*} number 
+ * @param {*} fileName 
+ */
+const sendMedia = (number, fileName) => {
+    number = number.replace('@c.us', '');
+    number = `${number}@c.us`
+    const media = MessageMedia.fromFilePath(`./mediaSend/${fileName}`);
+    client.sendMessage(number, media);
+}
+
+/**
+ * Enviamos un mensaje simple (texto) a nuestro cliente
+ * @param {*} number 
+ */
+const sendMessage = (number = null, text = null) => {
+    number = number.replace('@c.us', '');
+    number = `${number}@c.us`
+    const message = text || `Hola soy un BOT recuerda https://www.youtube.com/leifermendez`;
+    client.sendMessage(number, message);
+    readChat(number, message)
+    console.log(`${chalk.red('⚡⚡⚡ Enviando mensajes....')}`);
+}
+
+/**
+ * Escuchamos cuando entre un mensaje
+ */
+const listenMessage = () => {
+    client.on('message', async msg => {
+        const { from, to, body } = msg;
+        //34691015468@c.us
+        console.log(msg.hasMedia);
+        if (msg.hasMedia) {
+            const media = await msg.downloadMedia();
+            saveMedia(media);
+            // do something with the media data here
+        }
+
+        await greetCustomer(from);
+
+        console.log(body);
+
+        await replyAsk(from, body);
+
+        // await readChat(from, body)
+        // console.log(`${chalk.red('⚡⚡⚡ Enviando mensajes....')}`);
+        // console.log('Guardar este número en tu Base de Datos:', from);
+
+    });
+}
+
+/**
+ * Response a pregunta
+ */
+
+const replyAsk = (from, answer) => new Promise((resolve, reject) => {
+    console.log(`---------->`, answer);
+    if (answer === 'Quieromeme') {
+        sendMedia(from, 'meme-1.png')
+        resolve(true)
+    }
+
+})
+
+/**
+ * Revisamos si tenemos credenciales guardadas para inciar sessio
+ * este paso evita volver a escanear el QRCODE
+ */
+const withSession = () => {
+    // Si exsite cargamos el archivo con las credenciales
+    const spinner = ora(`Cargando ${chalk.yellow('Validando session con Whatsapp...')}`);
+    sessionData = require(SESSION_FILE_PATH);
+    spinner.start();
+    client = new Client({
+        session: sessionData
+    });
+
+    client.on('ready', () => {
+        console.log('Client is ready!');
+        spinner.stop();
+
+        // sendMessage();
+        // sendMedia();
+
+        connectionReady();
+
+    });
+
+
+
+    client.on('auth_failure', () => {
+        spinner.stop();
+        console.log('** Error de autentificacion vuelve a generar el QRCODE (Borrar el archivo session.json) **');
+    })
+
+
+    client.initialize();
+}
+
+/**
+ * Generamos un QRCODE para iniciar sesion
+ */
+const withOutSession = () => {
+    console.log('No tenemos session guardada');
+    client = new Client();
+    client.on('qr', qr => {
+        qrcode.generate(qr, { small: true });
+    });
+
+    client.on('ready', () => {
+        console.log('Client is ready!');
+        connectionReady();
+    });
+
+    client.on('auth_failure', () => {
+        console.log('** Error de autentificacion vuelve a generar el QRCODE **');
+    })
+
+
+    client.on('authenticated', (session) => {
+        // Guardamos credenciales de de session para usar luego
+        sessionData = session;
+        fs.writeFile(SESSION_FILE_PATH, JSON.stringify(session), function (err) {
+            if (err) {
+                console.log(err);
+            }
+        });
+    });
+
+    client.initialize();
+}
+
+const connectionReady = () => {
+    listenMessage();
+    readExcel();
+}
+
+/**
+ * Difundir mensaje a clientes
+ */
+const readExcel = async () => {
+    const pathExcel = `./chats/clientes-saludar.xlsx`;
+    const workbook = new ExcelJS.Workbook();
+    await workbook.xlsx.readFile(pathExcel);
+    const worksheet = workbook.getWorksheet(1);
+    const columnNumbers = worksheet.getColumn('A');
+    columnNumbers.eachCell((cell, rowNumber) => {
+        const numberCustomer = cell.value
+
+        const columnDate = worksheet.getRow(rowNumber);
+        let prevDate = columnDate.getCell(2).value;
+        prevDate = moment.unix(prevDate);
+        const diffMinutes = moment().diff(prevDate, 'minutes');
+
+        // Si ha pasado mas de 60 minuitos podemos enviar nuevamente
+        if (diffMinutes > 60) {
+            sendMessage(numberCustomer)
+            columnDate.getCell(2).value = moment().format('X')
+            columnDate.commit();
+
+        }
+    });
+
+    workbook.xlsx.writeFile(pathExcel);
+
+}
+
+
+/**
+ * Guardar historial de conversacion
+ * @param {*} number 
+ * @param {*} message 
+ */
+const readChat = async (number, message) => {
+    const pathExcel = `./chats/${number}.xlsx`;
+    const workbook = new ExcelJS.Workbook();
+    const today = moment().format('DD-MM-YYYY hh:mm')
+
+    if (fs.existsSync(pathExcel)) {
+        /**
+         * Si existe el archivo de conversacion lo actualizamos
+         */
+        const workbook = new ExcelJS.Workbook();
+        workbook.xlsx.readFile(pathExcel)
+            .then(() => {
+                const worksheet = workbook.getWorksheet(1);
+                const lastRow = worksheet.lastRow;
+                var getRowInsert = worksheet.getRow(++(lastRow.number));
+                getRowInsert.getCell('A').value = today;
+                getRowInsert.getCell('B').value = message;
+                getRowInsert.commit();
+                workbook.xlsx.writeFile(pathExcel);
+            });
+
+    } else {
+        /**
+         * NO existe el archivo de conversacion lo creamos
+         */
+        const worksheet = workbook.addWorksheet('Chats');
+        worksheet.columns = [
+            { header: 'Fecha', key: 'number_customer' },
+            { header: 'Mensajes', key: 'message' }
+        ];
+        worksheet.addRow([today, message]);
+        workbook.xlsx.writeFile(pathExcel)
+            .then(() => {
+
+                console.log("saved");
+            })
+            .catch((err) => {
+                console.log("err", err);
+            });
+    }
+}
+
+/**
+ * Saludos a primera respuesta
+ * @param {*} req 
+ * @param {*} res 
+ */
+
+const greetCustomer = (from) => new Promise((resolve, reject) => {
+    from = from.replace('@c.us', '');
+
+    const pathExcel = `./chats/${from}@c.us.xlsx`;
+    if (!fs.existsSync(pathExcel)) {
+        const firstMessage = [
+            '👋 Ey! que pasa bro',
+            'Recuerda subscribirte a mi canal de YT',
+            'https://www.youtube.com/leifermendez',
+            'de regalo te  dejo algunos de mis cursos',
+            '🔴 Aprende ANGULAR desde cero 2021 ⮕ https://bit.ly/367tJ32',
+            '✅ Aprende NODE desde cero 2021 ⮕ https://bit.ly/3od1Bl6',
+            '🔵 (Socket.io) NODE (Tutorial) ⮕ https://bit.ly/3pg1Q02',
+            '------',
+            '------',
+            'Veo que es la primera vez que nos escribes ¿Quieres que te envie un MEME?',
+            'Responde Quieromeme'
+        ].join(' ')
+
+        sendMessage(from, firstMessage)
+        sendMedia(from, 'curso-1-1.png')
+        sendMedia(from, 'curso-2.png')
+        sendMedia(from, 'curso-3.png')
+    }
+    resolve(true)
+})
+
+/**
+ * Controladores
+ */
+
+const sendMessagePost = (req, res) => {
+    const { message, number } = req.body
+    console.log(message, number);
+    sendMessage(number, message)
+    res.send({ status: 'Enviado!' })
+}
+
+/**
+ * Rutas
+ */
+
+app.post('/send', sendMessagePost);
+
+/**
+ * Revisamos si existe archivo con credenciales!
+ */
+(fs.existsSync(SESSION_FILE_PATH)) ? withSession() : withOutSession();
+
+
+app.listen(9000, () => {
+    console.log('Server ready!');
+})

conversation.js

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+const flowConversation = () => { }
+
+module.exports = { flowConversation }

package.json

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+{
+  "name": "test-ws-bot",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "chalk": "^4.1.0",
+    "excel4node": "^1.7.2",
+    "exceljs": "^4.2.1",
+    "express": "^4.17.1",
+    "file-type": "^16.3.0",
+    "mime-db": "^1.46.0",
+    "moment": "^2.29.1",
+    "ora": "^5.4.0",
+    "qrcode-terminal": "^0.12.0",
+    "whatsapp-web.js": "^1.12.5",
+    "xlsx": "^0.16.9"
+  }
+}

session.json

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+{"WABrowserId":"\"98X+ryPCw6NGBS5XUzY3uQ==\"","WASecretBundle":"{\"key\":\"sNHCjpK4m8HRo/UVSLxZSrkfV2XRl0cCeQjuAjXifWQ=\",\"encKey\":\"8U/QYE2oYRlogHVUvVkasP4VxdqI1A7F8Ncs2tHKTwk=\",\"macKey\":\"sNHCjpK4m8HRo/UVSLxZSrkfV2XRl0cCeQjuAjXifWQ=\"}","WAToken1":"\"R1GVXpZG3tTsedcWMmy5d5G6J7ZqWzCeZpKjxU+RbI4=\"","WAToken2":"\"1@MW/xvqV32Wy0SnGbcGYApbZWUY4zsB1G3Hhl+P4eCPa5IEOZTJfMXjAJRy7K03bNfPEkErz/xR09Xw==\""}