OAUTH2 library for Codeigniter:

A Codeigniter library which allows users to authorize your Linkedin, Facebook, Google, Instagram, Foursquare, Stripe, Dropbox or Box applications using OAuth2.

Usage example:

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');

class Test extends CI_Controller {
	private $api_basic_info = array (
		'site' => 'facebook',
		'app_key' => 'APP KEY',
		'app_secret' => 'APP SECRET',
		'redirect_url' => 'REDIRECT URL',
		'scope' => 'SCOPE'
	);

	function connect() {
		$this->load->library('oauth2', $this->api_basic_info);
		$connect_url = $this->oauth2->build_request_url();
		echo '<a href="'.$connect_url.'">connect</a>';
	}

	function after_connect() {
		$this->load->library('oauth2', $this->api_basic_info );
		if (!$this->session->userdata($this->api_basic_info['site'].'_oauth2_access_token')) {
			$this->oauth2->retrieve_access_token();
		}
		var_dump($this->oauth2->api_call());
	}
}

Requirements:

• libcurl.

Version 1.5 - January 27 2014

• Added Box authorization.
• Refactored code.

Version 1.4 - October 10 2013

• Added Stripe and Dropbox authorization.
• Refactored code.

Version 1.3 - July 5 2013

• Added Foursquare authorization.

Version 1.2 - June 20 2013

• Added Instagram authorization.

Version 1.1 - May 17 2013

• Added Google authorization.
• Removed the need for the cURL spark.

Version 1.0 - May 11 2013

• First release.