Convert a remote image to Base64-encoded string

image2base64.js

// Uses [request](https://github.com/mikeal/request)
// /?url=http://nodejs.org/logo.png
// /?uri=http://nodejs.org/logo.png
// /?url=http://nodejs.org/logo.png&cb=cbName
// /?url=http://nodejs.org/logo.png&callback=cbName

var fs      = require('fs');
var url     = require('url');
var http    = require('http');
var request = require('request');
var port    = 8888;
var server  = http.createServer(function requestListener(httpRequest, httpResponse) {
  var params       = url.parse(httpRequest.url, true).query;
  var imageURL     = params.url || params.uri || params.image;
  var callbackName = params.callback || params.cb || '';

  if (!imageURL) return httpResponse.end();

  request(
    {url: imageURL, encoding: 'binary'},
    function onImageResponse(error, imageResponse, imageBody) {
      if (error) throw error;

      var imageType   = imageResponse.headers['content-type'];
      var base64      = new Buffer(imageBody, 'binary').toString('base64');
      var dataURI     = 'data:' + imageType + ';base64,' + base64;
      var jsonString  = JSON.stringify({
        code: imageResponse.statusCode,
        desc: http.STATUS_CODES[imageResponse.statusCode],
        type: imageType,
        orig: imageURL,
        data: dataURI
      });
      var jsonpString = callbackName + '(' + jsonString + ')';
      var payload     = callbackName ? jsonpString : jsonString;

      httpResponse.writeHead(imageResponse.statusCode, {'Content-Type': 'application/json'});
      httpResponse.write(payload);
      httpResponse.end();
    }
  );
});

server.listen(port);
console.log('base64 server created and listening on port', port);