olivmonnier/moleculer-pdf

/*
 * moleculer-pdf
 * Copyright (c) 2019 moleculer-pdf (https://github.com/olivmonnier/moleculer-pdf)
 * MIT Licensed
 */

"use strict";

const puppeteer = require('puppeteer');

module.exports = {

    name: "pdf",

    /**
     * Default settings
     */
    settings: {
        puppeteerArgs: { headless: true },
        options: { format: 'Letter' },
        remoteContent: true
    },

    /**
     * Actions
     */
    actions: {
        transform: {
            params: {
                html: { type: 'string' }
            },
            handler(ctx) {
                return this.transform(ctx.params.html)
            }
        }
    },

    /**
     * Methods
     */
    methods: {
        /**
         * 
         * @param {String} html - The html content
         * @returns {Promise}
         */
        transform(html) {
            return new Promise(async (resolve, reject) => {
                if (typeof html !== 'string') {
                    reject('Invalid Argument: HTML expected as type of string and received a value of a different type. Check your request body and request headers.')
                }
    
                let browser;
                const { puppeteerArgs, options, remoteContent } = this.settings;
    
                if (puppeteerArgs) {
                    browser = await puppeteer.launch(puppeteerArgs);
                } else {
                    browser = await puppeteer.launch();
                }
            
                const page = await browser.newPage();
            
                if (remoteContent === true) {
                    await page.goto(`data:text/html;base64,${Buffer.from(html).toString('base64')}`, {
                        waitUntil: 'networkidle0'
                    });
                } else {
                    await page.setContent(html);
                }
            
                const result = await page.pdf(options);
                await browser.close();
    
                return resolve(result);
            })
        }
    },

    /**
     * Service created lifecycle event handler
     */
    created() {

    },

    /**
     * Service started lifecycle event handler
     */
    started() {

    },

    /**
     * Service stopped lifecycle event handler
     */
    stopped() {

    }
};