Authenticating with Google OAuth

Question

Im currently working on an OAuth authentication system for my site that allows the login of users via the Google API.

Im working with Codeigniter 2.0.2 and I do not have PECL OAuth compiled on my server, so im having to use raw php to do this.

I have go as far as authenticating the user with Google, and getting back the oauth_token and oauth_token_secret for that user.

But after endless reading of the protocol I still cannot find how that oauth_key and oauth_token_secret to gain access to the other API to collect the following information:

• Email Address
• Profile Picture
• Full Name
• Location

Here is the current code that im using to authenticate:

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

class OAuth extends CI_Controller
{
    public function __construct()
    {
        parent::__construct();

        $this->load->library('google_oauth',array(
            'key'       => '*REMOVED*',
            'secret'    => '*REMOVED*',
            'algorithm' => 'HMAC-SHA1'
        ));
    }

    public function login()
    {
        //Get Request Token
        $response = $this->google_oauth->get_request_token(
            site_url("/oauth/collect"),
            'http://www.google.com/m8/feeds/'
        );

        //Store temp
        $this->session->set_flashdata('g.token.secret', $response['token_secret']);

        //Redirect
        redirect($response['redirect']);
    }

    public function collect()
    {
        $token_s = $this->session->flashdata('g.token.secret');
        if(!$token_s)
        {
            $this->session->set_flashdata('error','Invalid auth session data, please rety your login');
            redirect();
        }

        $oauth = $this->google_oauth->get_access_token(false, $token_s);

        /*Check the data is valid*/
        if(!isset($oauth['oauth_token']) || !isset($oauth['oauth_token_secret']))
        {
            $this->session->set_flashdata('error','Unable to authecticate securly with Google, please try again');
            redirect();
        }

        $token = $oauth['oauth_token'];
        $secret = $oauth['oauth_token_secret'];

        //Will Store Here
    }
}

And im currently using a slightly modified version of this authentication class:

https://github.com/jimdoescode/CodeIgniter-YouTube-API-Library/blob/master/application/libraries/google_oauth.php

Answer 1

Have you tried experimenting with Google OAuth Playground ? Its useful for working out what API Feeds you can access and building valid request strings.

Here's a list of Google APIs you can access: Google API Directory

Hope that helps