GitHub OAuth + API test

github-oauth.php

<?php
/**
 * Github v3 API and OAuth classes
 */
class GitHubAuth
{
	const AUTH_URL = 'https://github.com/login/oauth/authorize';
	const ACCESS_TOKEN_URL = 'https://github.com/login/oauth/access_token';

	private $app_id;
	private $app_secret;

	public function __construct($app_id, $app_secret)
	{
		$this->app_id = $app_id;
		$this->app_secret = $app_secret;
	}

	public function authorize($redirect_uri)
	{
		$url = self::AUTH_URL . '?' . http_build_query(array(
			'client_id' => $this->app_id,
			'redirect_uri' => $redirect_uri
		));

		// 307 Temporary Redirect
		header("Location: $url", TRUE, 307);
		die();
	}

	public function exchange_access_token($code)
	{
		$url = self::ACCESS_TOKEN_URL . '?' . http_build_query(array(
			'client_id' => $this->app_id,
			'client_secret' => $this->app_secret,
			'code' => $code
		));

		parse_str(file_get_contents($url), $pieces);

		if(isset($pieces['access_token']))
		{
			return $pieces['access_token'];
		}
	}
}



class GitHub
{
	const API_URL = 'https://api.github.com/';

	private $access_token;
	public $rate_limit = 0;

	public function __construct($access_token)
	{
		$this->access_token = $access_token;
	}

	public function request($url, array $params = NULL)
	{
		// Add our OAuth token and increase the response from 30 to 100
		$params['access_token'] = $this->access_token;
		$params['per_page'] = 100;

		$url = self::API_URL . $url . '?' . http_build_query($params);

		$response = json_decode(file_get_contents($url));

		// Also find out how many calls are left
		preg_match('~Remaining: (\d+)~', join(" ", $http_response_header), $match);
		$this->rate_limit = (int) $match[1];

		return $response;
	}

	public function rateLimit()
	{
		$response = $this->request('rate_limit');

		if($response AND isset($response->rate) AND isset($response->rate->remaining))
		{
			return $response->rate->remaining;
		}
	}

	public function gists($user = null)
	{
		return $this->request($user ? "users/$user/gists" : 'gists');
	}

	public function user($user = null)
	{
		return $this->request($user ? "users/$user" : 'user');
	}
}

request.php

<?php

require('github-oauth.php');

$app_id = '...';
$app_secret = '...';

$githubAuth = new GitHubAuth($app_id, $app_secret);

$githubAuth->authorize('http://localhost/path/response.php');

response.php

<?php

require('github-oauth.php');

$app_id = '...';
$app_secret = '...';

$githubAuth = new GitHubAuth($app_id, $app_secret);

$token = $githubAuth->exchange_access_token($_GET['code']);

// Now use the token
$github = new Github($token);

print_r($github->user());

var_dump($github->rate_limit);