mail.js

const fs = require('fs');
const csv = require('csv-parser');
const qrcode = require('qrcode');
const nodemailer = require('nodemailer');
const Jimp = require("jimp");


const csvFilePath = './demo.csv';
const outputDir = './qrcodes';

if (!fs.existsSync(outputDir)) {
    fs.mkdirSync(outputDir);
}

const transporter = nodemailer.createTransport({
    service: 'gmail',
    host: "smtp.gmail.com",
    port: 587,
    auth: {
        user: '',
        pass: ''
    }
});

const rows = [];
fs.createReadStream(csvFilePath)
    .pipe(csv())
    .on('data', (row) => {
        rows.push(row);
    })
    .on('end', async () => {
        for (let i = 0; i < rows.length; i++) {
            const row = rows[i];
            const id = row.id;
            const email = row.email;
            const name = row.name;
            const qrCodeData = id;
            const qrCodePath = `${outputDir}/${id}.png`;

            try {
                await qrcode.toFile(qrCodePath, qrCodeData, {
                    color: {
                        dark: '#000000',
                        light: '#FFFFFF',
                    },
                    scale: 11,
                    margin: 2
                });

                const qrImage = await Jimp.read(qrCodePath);
                const font = await Jimp.loadFont(Jimp.FONT_SANS_16_BLACK);
                qrImage.print(font, 130, qrImage.bitmap.height - 20, id);
                await qrImage.writeAsync(qrCodePath);

                const mailOptions = {
                    from: 'nazimfilzer@gmail.com',
                    to: email,
                    subject: 'Welcome to TECHNOO',
                    text: `SUPPP ${name}!!`,
                    attachments: [{
                        filename: `${id}.png`,
                        path: qrCodePath
                    }]
                };

                await transporter.sendMail(mailOptions);
                console.log(`Sent QR code for id ${id} to ${email}`);

                if (i % 2 === 1) {
                    console.log('Pausing for 10 seconds...');
                    await new Promise(resolve => setTimeout(resolve, 10000));
                    console.log('Resuming...');
                }
            } catch (error) {
                console.error(`Failed to send QR code for id ${id} to ${email}: ${error}`);
            }
        }

        console.log('Done generating and sending QR codes');
    });