hapi-auth-facebook/lib/index.js

Simple Facebook Authentication for Hapi.js Apps

var env = require('env2')('.env');
var querystring = require('querystring');
var https = require('https');

var createAccessTokenQuery = function(request, server, options) {
  var query = querystring.stringify({
    client_id: process.env.FACEBOOK_APP_ID,
    redirect_uri: server.info.uri + options.redirectUri,
    client_secret: process.env.FACEBOOK_APP_SECRET,
    code: request.query.code
  });
  return query;
};

var createAccessTokenReqestOpts = function(request, server, options) {
  var accessTokenQuery = createAccessTokenQuery(request, server, options);
  return {
    hostname: 'graph.facebook.com',
    path: '/v2.3/oauth/access_token?' + accessTokenQuery,
    method: 'GET'
  };
}

var getBody = function(response, callback) {
  var body = '';
  response.on('data', function(chunk) {
      body += chunk;
  });
  response.on('end', function() {
    callback(body);
  });
};

var httpsRequest = function(options, callback) {
  var request = https.request(options, function(response) {
    getBody(response, callback);
  });
  request.end();
};

var redirectHandler = function(request, reply, server, options) {
  var requestOpts = createAccessTokenReqestOpts(request, server, options);
  httpsRequest(requestOpts, function(accessTokenData) {
    var token = JSON.parse(accessTokenData).access_token;
    options.handler(request, reply, token);
  });
};

function createFacebookAuthReqUrl(server, redirectUri) {
  host = 'https://www.facebook.com';
  path = '/dialog/oauth?' + querystring.stringify({
    client_id: process.env.FACEBOOK_APP_ID,
    redirect_uri: server.info.uri + redirectUri
  });
  return host + path;
}

var authReqHandler = function(request, reply, server, options) {
  reply.redirect(createFacebookAuthReqUrl(server, options.redirectUri));
};

exports.register = function(server, options, next) {
  server.route([
    {
      method: 'GET',
      path: options.tokenRequestPath,
      handler: function(request, reply) {
        authReqHandler(request, reply, server, options);
      }
    },
    {
      method: 'GET',
      path: options.redirectUri,
      handler: function(request, reply) {
        redirectHandler(request, reply, server, options);
      }
    }
  ]);
  next();
}

exports.register.attributes = {
  name: 'hapi-auth-facebook'
};