info.lk minal OAuth Client Library

info-lk.php

<?php
	session_start();
	//
	//	Consent denied by user
	if (isset($_SESSION['info-lk']['ra']) && isset($_GET['error']))
		$_SESSION['info-lk']['error'] = 'access denied';
	//
	//	Process received single use token
	else if (isset($_SESSION['info-lk']['ra']) && isset($_GET['code'])){
		if (!isset($_GET['state']) || $_SESSION['info-lk']['nx'] != $_GET['state'])
			$_SESSION['info-lk']['error'] = 'auth spoof detected';
		else{
			$context = stream_context_create(
				array(
					'http' => array(
						'method' => 'POST',
						'header' => 'Content-Type:application/x-www-form-urlencoded'."\r\n",
						'content' => http_build_query(
							array(
								'code' => $_GET['code'],
								'client_id' => $info_lk_settings['app'],
								'client_secret' => $info_lk_settings['secret'],
								'grant_type' => 'authorization_code',
								'redirect_uri'=>$_SESSION['info-lk']['ra']
							)
						)
					),
					'ssl' => array(
						'verify_peer' => $info_lk_settings['ssl_verify_peer']
					)
				)
			);
			$oauth = json_decode(file_get_contents('https://account.info.lk/oauth', false, $context), true);
			if (isset($oauth['access_token'])){
				$oauth = base64_decode($oauth['access_token']);
				$_SESSION['info-lk']['user'] = json_decode(substr($oauth, 0, strrpos($oauth,'}')+1), true);
				$redirect_after = $_SESSION['info-lk']['ra'];
				unset($_SESSION['info-lk']['ra']);
				unset($_SESSION['info-lk']['nx']);
				header('location:'.$redirect_after);
			}
			else
				$_SESSION['info-lk']['error'] = 'auth failed';
		}
	}
	//
	//	Redirect to OAuth consent screen
	else if (!isset($_SESSION['info-lk']) || !isset($_SESSION['info-lk']['user'])){
		$redirect_after = (isset($_SERVER['REQUEST_SCHEME']) ?
						$_SERVER['REQUEST_SCHEME'] :
						(isset($_SERVER['HTTPS']) ? 'https' : 'http')
					).'://'.$_SERVER['SERVER_NAME'].$_SERVER['REQUEST_URI'];
		$nonce = time().rand(100, 999);
		$_SESSION['info-lk'] = array('ra' => $redirect_after, 'nx' => $nonce);
		header('location:https://account.info.lk/#oauth/?response_type=code&'.
			'client_id='.$info_lk_settings['app'].'&'.
			'redirect_uri='.urlencode($redirect_after).'&'.
			'scope='.$info_lk_settings['scope'].
			'&state='.$nonce);
	}
?>

Usage

<?php

 $info_lk_settings = array(
	'app' => '87345923489',
	'secret' => '98xd7s5h9df786sd09',
	'scope' => 'public_profile',
	'ssl_verify_peer' => true
 );

include 'info-lk.php';

print_r($_SESSION['info-lk']);

 ?>