Node test for Facebook Graph Insights

test_node_facebook_graph_insights.js

const FB = require('fb');
const moment = require('moment');

const options = {
  appId: '',
  version: 'v2.5',
  appSecret: '',
  scope: 'user_about_me,publish_actions,read_insights',
  redirect_uri: 'http://localhost:3000/login/callback'
};

const routes = {
  /**
   * Index
   * @param  {[type]} req [description]
   * @param  {[type]} res [description]
   * @return {[type]}     [description]
   */
  index: (req, res) => {
    var accessToken = req.session.access_token;

    if (!accessToken) {
      res.render('index', {
        title: 'Express',
        loginUrl: getFacebookLoginUrl()
      });
    } else {
      res.render('menu');
    }
  },

  loginCallback: (req, res, next) => {
    var code = req.query.code,
      accessToken = '',
      expires = 0;

    if (req.query.error) {
      // user disallowed the app
      return res.render('login-error');
    } else if (!code) {
      return res.redirect('/');
    }

    // Exchange code for access token
    FB.api('oauth/access_token', {
      client_id: options.appId,
      client_secret: options.appSecret,
      redirect_uri: options.redirect_uri,
      code
    }, result => {
      if (!result || result.error) {
        console.log(!res ? 'error occurred' : res.error);
        return next(result); // todo: handle error
      }

      accessToken = result.access_token;
      expires = result.expires ? result.expires : 0;

      // todo: extend access token
      req.session.access_token = accessToken;
      req.session.expires = expires;
      res.redirect('/');
    });
  },

  logout: (req, res) => {
    req.session = null; // clear session
    res.redirect('/');
  },

  search: (req, res) => {
    var parameters = req.query;
    parameters.access_token = req.session.access_token;

    FB.api('/search', req.query, result => {
      if (!result || result.error) {
        return res.send(500, 'error');
      }

      res.send(result);
    });
  },

  friends: (req, res) => {
    FB.api('me/friends', {
      fields: 'name,picture',
      limit: 250,
      access_token: req.session.access_token
    }, result => {
      if (!result || result.error) {
        return res.send(500, 'error');
      }
      res.send(result);
    });
  },

  announce: (req, res) => {
    var parameters = req.body;
    parameters.access_token = req.session.access_token;

    FB.api('/me/nodescrumptious:eat', 'post', (parameters, result) => {
      if (!result || result.error) {
        return res.send(500, result.error.message);
      }

      res.send(result);
    });
  },

  /**
   * Get info site
   * @param  {[type]} req [description]
   * @param  {[type]} res [description]
   * @return {[type]}     [description]
   */
  pageInfo: (req, res) => {
    FB.api(
      '/343464585724065',
      'GET', {
        access_token: req.session.access_token
      }, result => {
        if (!result && result.error) {
          console.log(result.error);
          return result.send(500, result.error);
        }

        res.send(result);
      }
    );
  },

  /**
   * Get page insights info
   * @param  {[type]} req [description]
   * @param  {[type]} res [description]
   * @return {[type]}     [description]
   */
  pageInsights: (req, res) => {
    const since = moment('23/02/2016 00:00:00', 'DD-MM-YYYY HH:mm:ss').format('X');
    const until = moment('23/02/2016 12:59:00', 'DD-MM-YYYY HH:mm:ss').format('X');

    // day, week, days_28, month, lifetime
    // '270813646278215/insights/page_fan_adds/{day, week, month, lifetime}'

    FB.api(
      '270813646278215/insights',
      'GET', {
        metric: 'page_fan_adds',
        period: 'day',
        since: since,
        until: until,
        locale: 'es_PE',
        access_token: req.session.access_token
      }, result => {
        if (!result && result.error) {
          console.log(result.error);
          return result.send(500, result.error);
        }

        res.send(result);
      }
    );
  }
};

function getFacebookLoginUrl() {
  return `https://www.facebook.com/dialog/oauth?client_id=${options.appId}&redirect_uri=${encodeURIComponent(options.redirect_uri)}&scope=${encodeURIComponent(options.scope)}`;
}

module.exports = routes;