restaurants/services/yelp.js

Search a service and get a list of restaurants.

/**
 * Dependencies
 */

var OAuth = require('oauth').OAuth
  , stringify = require('querystring').stringify
  , findAll = require('./find-all');

/**
 * Yelp Constants
 */

var CONSUMER_KEY = process.env.YELP_CONSUMER_KEY
  , COMSUMER_SECRET = process.env.YELP_CONSUMER_SECRET
  , TOKEN = process.env.YELP_TOKEN
  , TOKEN_SECRET = process.env.YELP_TOKEN_SECRET
  , ENDPOINT = 'http://api.yelp.com/v2/search'
  , oauth = null
  , MAX_LIMIT = 20
  , MAX_OFFSET = 480;

/**
 * Expose `search`
 */

module.exports = function(lat, lng, radius, all, callback) {
  if (!CONSUMER_KEY) throw new Error('Environment variable YELP_CONSUMER_KEY must be set.');
  if (!COMSUMER_SECRET) throw new Error('Environment variable YELP_CONSUMER_SECRET must be set.');
  if (!TOKEN) throw new Error('Environment variable YELP_TOKEN must be set.');
  if (!TOKEN_SECRET) throw new Error('Environment variable YELP_TOKEN_SECRET must be set.');

  var query = {
    term: 'restaurants'
  , radius_filter: radius
  , ll: lat + ',' + lng
  };

  oauth = new OAuth(null, null, CONSUMER_KEY, COMSUMER_SECRET, '1.0', null, 'HMAC-SHA1');

  if (all) {
    findAll(query, MAX_LIMIT, MAX_OFFSET, getRestaurants, callback);
  } else {
    getRestaurants(query, 10, 0, callback);
  }
};

/**
 * Get the restaurants
 */

function getRestaurants(query, limit, offset, callback) {
  query.limit = limit;
  query.offset = offset;

  oauth.get(ENDPOINT + '?' + stringify(query), TOKEN, TOKEN_SECRET, function(err, data, res) {
    callback(err, JSON.parse(data).businesses);
  });
}