Simple Reusable Proxy with Partial Application

proxy.js

var express = require('express');
var extend  = require('extend');
var q       = require('q');
var request = q.denodeify( require('request') );

var makeRequester = function makeRequester(opts) {
  return function requester(path) {
    var retrieveResponse =
      request({
        'strictSSL': opts.selfsigned !== true, // for snakeoil certs
        'uri': opts.url + path,
      })
      .then(function transform(response) {
        return {
          'meta': response[0],
          'body': response[1],
        };
      })
    ;
    return retrieveResponse;
  };
};

var esRequest = makeRequester({
  'url' : 'https://localhost:9200',
  'selfsigned': true,
});

var app = express();

var scrubNodesData = function scrubNodesData(data) {
  var cleanData = extend({}, data); // shallow

  cleanData.nodes = Object.keys(cleanData.nodes).reduce(
    function scrub(accumulator, nodeKey) {
      accumulator[nodeKey] = {
        'name': data.nodes[nodeKey].name,
        'version': data.nodes[nodeKey].version,
      };
      return accumulator;
    },
    {}
  );

  return cleanData;
};

app.get('*', function(req,res) {
  esRequest(req.path)
    .then(function(proxyResponse) {
      console.log(req.path);

      if ( req.path.match(/_nodes/) ) {
        var data = scrubNodesData( JSON.parse(proxyResponse.body) );
        res.send(proxyResponse.meta.statusCode, JSON.stringify(data));
      }
      else {
        res.send(
          proxyResponse.meta.statusCode,
          proxyResponse.body
        );
      }
    })
    .fail(console.error);
});

var server = app.listen(3000, function() {
  console.log('Listening on port %d', server.address().port);
});