pdf-poppler/lib/info.js

Convert PDF files into images using Poppler with promises. It achieves 10x faster performance compared to other PDF converters. Poppler library attached inside statically, so it has not require installation of poppler.

const path = require('path');
const {execFile} = require('child_process');
const EXEC_OPTS = require('../index').exec_options;

let popplerPath = require('../index').path;

module.exports = function (file) {
    return new Promise((resolve, reject) => {
        execFile(path.join(popplerPath, 'pdfinfo'), [file], EXEC_OPTS, (error, stdout, stderr) => {
            if (error) {
                reject(error);
            }
            else {
                let nfo = stdout.split(/\r?\n/);
                nfoObj = {};
                nfo.forEach(node => {
                    // split by first colon
                    let n = node.replace(/(^:)|(:$)/, '').split(/:(.+)/);
                    if (n[0]) {
                        nfoObj[n[0].replace(/ /g, "_").toLowerCase()] = n[1].trim();
                    }
                });

                let d = nfoObj['page_size'].split('x');

                // find dimensions in pixel
                nfoObj['width_in_pts'] = parseFloat(d[0]);
                nfoObj['height_in_pts'] = parseFloat(d[1]);

                // nfoObj['width_in_px'] = parseFloat(d[0])*96/72;
                // nfoObj['height_in_px'] = parseFloat(d[1])*96/72;

                resolve(nfoObj);
            }
        });
    });
};