Generate invoice with barcode from html2pdf

invoice_html2pdf.js

Invoice.prototype.getBarcode = function() {
    const CUIT = this.tenant().cuit;
    const baseCode = `${CUIT}\
${(this.type + '').padStart(3, '0')}\
${(this.salesPoint + '').padStart(5, '0')}\
${this.cae}${moment(this.caeDueDate).format('YYYYMMDD')}`;

    let oddSum = 0,
    evenSum = 0;
    baseCode.split('').forEach((digit, index) => {
        digit = parseInt(digit);
        if (index % 2) {
            oddSum += digit;
        } else {
            evenSum += digit;
        }
    });

    const sum = oddSum * 3 + evenSum;
    const verifier = 10 - (sum % 10);
    const fullcode = baseCode + verifier;
    return fullcode;
};

Invoice.getHtml = async function(id) {
    // ...

    const data = {
        invoice,
        items,
        tenant,
        headers: {
            left: tenant.invoiceHeaders.left.split(/\r?\n/),
            right: tenant.invoiceHeaders.right.split(/\r?\n/)
        },
        subtotal: invoice.getSubtotal(),
        displaySubtotals: invoice.clientVatKind == 'respInsc',
        displayDates: [Concepts.Services, Concepts.ProductsServices].includes(
            invoice.concept
        ),
        /* El barcode en el template html va con la fuente https://github.com/Holger-Will/2of5-font */
        barcode: invoice.getBarcode()
    };

    const templatePath = path.resolve('common/models/html/invoice.html');
    const content = await Promise.promisify(fs.readFile)(templatePath, 'utf8');

    const template = handlebars.compile(content);

    const html = template(data);

    return html;
};

Invoice.pdf = async function(id) {
    try {
        const html = await Invoice.getHtml(id);
        const browser = await Puppeteer.launch({
            args: [
                '--headless',
                '--no-sandbox',
                '--disable-dev-shm-usage',
                '--disable-setuid-sandbox',
                '--disable-web-security',
                '--disable-gpu'
            ],
            /* eslint-disable indent */
            ...(process.env.CHROMIUM_EXECUTABLE
                ? {
                    executablePath: process.env.CHROMIUM_EXECUTABLE
                }
                : null)
            /* eslint-enable indent */
        });
        const page = await browser.newPage();
        //page.on('console', msg => logger.debug('PAGE LOG:', msg.text()));
        await page.goto('data:text/html,' + html, {
            waitUntil: 'networkidle0'
        });
        const pdf = await page.pdf({
            format: 'A4'
        });
        await browser.close();
        return [pdf, 'application/pdf'];
    } catch (error) {
        logger.error(error);
        throw new Error('Cannot create invoice PDF.');
    }
};