jpeginator.js

// The JPEGINATOR
// OpenWhisk action to convert images to JPEG
//
// Author: Frederico Munoz <frederico.munoz@pt.ibm.com>
// Data: APR 2017
// License: Eclipse Public License 1.0

var fs = require('fs');
var gm = require('gm').subClass({imageMagick: true});

function main (params) {
    
    var b64string = params.image;
    var buf = Buffer.from(b64string, 'base64')

    return new Promise(function(resolve, reject) {
        gm(buf).toBuffer('JPEG', function (err, buffer) {
    	    if (err)
    	    {
    		console.log("Error");
		return {result: "error"};
    	    } else {
    		console.log("Success");
    		resolve({headers: { 'Content-Type': 'image/jpeg' },
    			 statusCode: 200,
    			 body: buffer.toString('base64')});
    	    }
    	});
    });
}