Gnarly Node.js Balanced Payments client

gistfile1.js

/*

Usage:

// In app.js
var balanced = require('./this-file.js');
balanced.configure({
  secret: '...',
  marketplaceUri: '...'
});

// In response middleware
var balanced = require('./this-file.js');

balanced.get(..., callback);
balanced.post(..., callback);

*/

require('sugar');
var request = require('request');
var winston = require('winston');
var u = require('url');

var config = {
  secret: null,
  marketplaceUri: null
};

function client(method, uri, json, callback) {
  if (!config.secret || !config.marketplaceUri) {
    throw new Error('Missing required API secret or marketplaceUri');
  }

  var url = u.format({
    protocol: 'https',
    host: 'api.balancedpayments.com',
    auth: config.secret + ':',
    pathname: uri,
  });

  request({
    method: method,
    uri: url,
    encoding: 'utf-8',
    followRedirect: false,
    json: json || true
  }, function (err, response, body) {
    if ((method === 'PUT' || method === 'POST') && !json) {
      throw new Error('API call is missing "json" parameter');
    }

    if (response && response.statusCode >= 400) {
      var msg = [
        'Balanced call failed:',
        method,
        uri,
        response.statusCode,
        body.description
      ].join(' ');
      winston.error(msg);

      err = new Error('Balanced call failed: ' + body.description);
    }

    callback(err, response, body);
  });
}

// marketplaceUri is really only for creating new accounts.
// Other REST uris should be available on the stored responses

module.exports = {
  configure: function (theConfig) {
    config = Object.merge(config, theConfig, true);
  },

  get: function (uri, callback) {
    client('GET', uri, null, callback);
  },
  post: function (uri, json, callback) {
    client('POST', uri, json, callback);
  },
  put: function (uri, json, callback) {
    client('PUT', uri, json, callback);
  },
  delete: function (uri, callback) {
    client('DELETE', uri, null, callback);
  },

  // This is for testing only
  createCard: function (card, callback) {
    client('POST', config.marketplaceUri + '/cards', card, callback);
  },
  createBankAccount: function (bankAccount, callback) {
    client('POST', config.marketplaceUri + '/bank_accounts', bankAccount, callback);
  },
  createBuyer: function (email, cardUri, callback) {
    client('POST', config.marketplaceUri + '/accounts', {
      email_address: email,
      card_uri: cardUri
    }, callback);
  },
  createMerchant: function (email, merchant, bankAccountUri, name, callback) {
    client('POST', config.marketplaceUri + '/accounts', {
      email_address: email,
      merchant: merchant,
      bank_account_uri: bankAccountUri,
      name: name
    }, callback);
  }
};