html2pdf in node using phantomjs

html2pdf.js

// 2017 version based on phantomjs, probably much easier nowadays with puppeteer
'use strict';

const Promise = require('bluebird');
const fs = require('fs');
const readFile = Promise.promisify(fs.readFile);
const unlink = Promise.promisify(fs.unlink);
const phantom = require('phantom');

const logger = require('logger');

function getRandomInt(min, max) {
    min = Math.ceil(min);
    max = Math.floor(max);
    //The maximum is exclusive and the minimum is inclusive
    return Math.floor(Math.random() * (max - min)) + min;
}

function html2pdf(content) {
    let instance, page;
    let filename = `/tmp/${getRandomInt(1, 100)}.pdf`;
    return phantom.create().then(i => {
        instance = i;
        return instance.createPage();
    }).then(p => {
        page = p;
        page.property('viewportSize', { width: 1024, height: 600 });
        page.property('paperSize', {
            format: 'A4',
            orientation: 'portrait'
        });
        return page.setContent(content, 'file://' + filename);
    }).then(() => {

        return page.render(filename, {
            format: 'pdf'
        });
    }).then(() => {
        return instance.exit();
    }).then(() => {
        return readFile(filename).then(data => {
            return unlink(filename).return(data);
        });
    }).catch(err => {
        logger.error(err);
    });
};