bwip-js/examples/server.js

JavaScript barcode generator supporting over 100 types and standards.

// file : bwip-js/server.js
//
// Simple node HTTP server that renders bar code images using bwip-js.
//
// Usage:  node server [address:port] ...
//
// To specify all interfaces, use * as the address
//
// If no address:port are specified, the default is: *:3030
//
"use strict";

const http   = require('http');
const url    = require('url');
const bwipjs = (function() {
    try {
        return require('bwip-js');   // for installed usage
    } catch (e) {
        return require('..');        // for development use only
    }
})();

console.log('bwip-js ' + bwipjs.BWIPJS_VERSION + ' / BWIPP ' + bwipjs.BWIPP_VERSION);

// Optionally, load custom fonts.  This shows how to load the Inconsolata font,
// supplied with the bwip-js distribution.  The path to your fonts will be different.
// The second and third params, the width and height size multipliers, allow scaling
// a font to the BWIPP built-in font metrics.
// 100 (100%) indicates to use the font's default size.
//bwipjs.loadFont('Inconsolata', 100,
//        require('fs').readFileSync(__dirname + '/fonts/Inconsolata.otf', 'binary'));

const server = http.createServer(function(req, res) {
    // If the url does not begin /?bcid= then 404.  Otherwise, we end up
    // returning 400 on requests like favicon.ico.
    if (req.url.indexOf('/?bcid=') != 0) {
        res.writeHead(404, { 'Content-Type':'text/plain' });
        res.end('BWIP-JS: Unknown request format.', 'utf8');
    } else {
        bwipjs.request(req, res, { sizelimit:1024*1024 });    // limit image size
    }
})

let binds = 0;
for (let i = 2; i < process.argv.length; i++) {
    let a = /^([^:]+):(\d+)$/.exec(process.argv[i]);
    if (a) {
        if (a[1] == '*') {
            server.listen(+a[2]);
        } else {
            server.listen(+a[2], a[1]);
        }
    } else {
        console.log(process.argv[i] + ': option ignored...');
    }
    console.log('listening on ' + process.argv[i]);
    binds++;
}
if (!binds) {
    server.listen(process.env.PORT || 3030);
    console.log('listening on *:' + (process.env.PORT || 3030));
}