Simple function to generate a basic profile for users that log into your Mobile Service via Twitter and Facebook. This is great for pre-completing a default profile and/or getting profile images for your users. Includes simple mocha tests.

fetchBasicProfile.js

function fetchBasicProfile(user, callback) {
  var req = require('request');
	var util = require('util');

	var sep = user.userId.indexOf(':');
	var profile = {};
	profile.source = user.userId.substring(0, sep).toLowerCase();
	profile.id = user.userId.substring(sep + 1);

	var createError = function(e, r) {
		var newError = {};
		newError.message = e ? e.toString() : r.body;
		newError.statusCode = r.statusCode;
		newError.responseText = r.body;
		return newError;
	}

	switch (profile.source) {
		case 'facebook':
			var url = util.format('https://graph.facebook.com/%s', profile.id);
			req.get(url, function(error, response, body) {
				if (error || response.statusCode != 200) callback(createError(error, response));
				else {
					var rmt = JSON.parse(body);
					profile.name = rmt.name;
					profile.firstName = rmt.first_name;
					profile.lastName = rmt.last_name;
					profile.userName = rmt.username;
					profile.smallImageUrl = url + '/picture?type=small';
					profile.largeImageUrl = url + '/picture?type=large';
					callback(null, profile);
					return;
				}
			});
			break;
		case 'twitter':
			var url = util.format('https://api.twitter.com/1/users/show.json?user_id=%s', profile.id);
			req.get(url, function(error, response, body) {
				if (error || response.statusCode != 200) callback(createError(error, response));
				else {
					var rmt = JSON.parse(body);
					profile.name = rmt.name;
					profile.userName = rmt.screen_name;
					profile.smallImageUrl = util.format('http://api.twitter.com/1/users/profile_image/%s.normal', profile.userName);
					profile.largeImageUrl = util.format('http://api.twitter.com/1/users/profile_image/%s.bigger', profile.userName);
					callback(null, profile);
				}
			});
			break;
		default:
			callback(null, profile);
	}
}

mocha_test.js

var u1 = { userId: "Facebook:753472068" };
var u2 = { userId: "Twitter:23967168" };

var assert = require('assert');
var req = require('request');

function loadAndVerifyImage(url, callback) {
  req.get(url, function(error, response, body) {
		assert.equal(200, response.statusCode);
		assert.equal(0, response.headers['content-type'].indexOf('image/'));
		callback();
	})
}

suite('fetchBasicProfile', function() {
	test('source and id OK', function(done) {
		fetchBasicProfile(u1, function(error, profile) {
			assert.equal('facebook', profile.source);
			assert.equal('753472068', profile.id);
			done();
		});
	});

	test('facebook basics', function(done) {
		fetchBasicProfile(u1, function(error, profile) {
			assert.equal('Josh Twist', profile.name);
			assert.equal('Josh', profile.firstName);
			assert.equal('Twist', profile.lastName);
			assert.equal('joshtwist', profile.userName);
			done();
		});
	});

	test('facebook small image', function(done) {
		fetchBasicProfile(u1, function(error, profile) {
			loadAndVerifyImage(profile.smallImageUrl, function() {
				done();
			});
		});
	});

	test('facebook large image', function(done) {
		fetchBasicProfile(u1, function(error, profile) {
			loadAndVerifyImage(profile.largeImageUrl, function() {
				done();
			});
		});
	});

	test('twitter basics', function(done) {
		fetchBasicProfile(u2, function(error, profile) {
			assert.equal('Josh Twist', profile.name);
			assert.equal('joshtwist', profile.userName);
			done();
		});
	});

	test('twitter small image', function(done) {
		fetchBasicProfile(u2, function(error, profile) {
			loadAndVerifyImage(profile.smallImageUrl, function() {
				done();
			});
		});
	});

	test('twitter large image', function(done) {
		fetchBasicProfile(u2, function(error, profile) {
			loadAndVerifyImage(profile.largeImageUrl, function() {
				done();
			});
		});
	});

	test('test bad user', function(done) {
		fetchBasicProfile({ userId: 'Facebook:1nons2ense3' }, function(err, profile) {
			assert.equal(null, profile);
			assert.notEqual(null, err);
			done();
		});
	});
});