example

'use strict';

var secret = require('./secret.js');
var rest = require('restler');
var crypto = require('crypto');
var querystring = require('querystring');
var fatSecretRestUrl = 'http://platform.fatsecret.com/rest/server.api';
var apiKey = process.env.FATKEY ||secret.fatKey;
var sharedSecret = process.env.FATSECRET ||secret.fatSecret;
var querySecret = sharedSecret + '&';

var parseNumStr = function(out) {
  // handle different types of values
  out = out.replace(/[^0-9\.]+/g,' ').split(' ').filter(function(n){ return !!n; });
  return out;
};

var fatSecret = function(query, next) {
  console.log('infatsecret', query);
  var date = new Date();
  // Note that the keys are in alphabetical order
  var reqObj = {
    format : 'json',
    max_results : 1,
    method: 'foods.search',
    oauth_consumer_key: apiKey,
    oauth_nonce: Math.random().toString(36).replace(/[^a-z]/, '').substr(2),
    oauth_signature_method: 'HMAC-SHA1',
    oauth_timestamp: Math.floor(date.getTime() / 1000),
    oauth_version: '1.0',
    search_expression: query // test query
  };

  // construct a param=value& string and uriEncode
  var paramsStr = querystring.stringify(reqObj, '&', '=');
  var sigBaseStr = 'POST&' + encodeURIComponent(fatSecretRestUrl) + '&' + encodeURIComponent(paramsStr);
  var hashedBaseStr  = crypto.createHmac('sha1', querySecret).update(sigBaseStr).digest('base64');
  reqObj.oauth_signature = hashedBaseStr;

  rest.post(fatSecretRestUrl, {
    data: reqObj,
  }).on('complete', function(data, response) {
    // console.log(query, data);
    // TODO: revisit handling errors
    var out;
    if (data.foods) {
      out = data.foods.food.food_description;
      out = parseNumStr(out);
    }
    next(out);
  });
};

module.exports = exports = {
  fatSecret : fatSecret,
};