first commit
This commit is contained in:
Olu Amey
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<?php if (! defined('BASEPATH')) exit('No direct script access allowed');
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/**
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* Name: Facebook Login Library
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*
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* Author: appleboy
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*
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*/
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require 'vendor/autoload.php';
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//require_once 'vendor/facebook/php-sdk-v4/src/Facebook/autoload.php';
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use Facebook\Facebook;
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use Facebook\FacebookRequestException;
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use Facebook\FacebookRedirectLoginHelper;
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class Lib_login
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{
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/**
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* CodeIgniter global
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*
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* @var string
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**/
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protected $ci;
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/**
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* @var FB
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*/
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private $fb;
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private $helper;
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private $facebook_default_scope;
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private $facebook_login_url;
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private $facebook_logout_url;
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/**
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* __construct
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*
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* @return void
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* @author Ben
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**/
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public function __construct()
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{
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if (!session_id()) {
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session_start();
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}
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$this->ci =& get_instance();
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$this->ci->load->library('session');
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$this->ci->config->load('facebook');
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$this->ci->load->helper('url');
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if (! isset($_SESSION)) {
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session_start();
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}
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$this->facebook_default_scope = explode(',', $this->ci->config->item("facebook_default_scope"));
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$facebook_app_id = $this->ci->config->item("facebook_app_id");
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$facebook_app_secret = $this->ci->config->item("facebook_app_secret");
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$this->facebook_login_url = base_url() . $this->ci->config->item("facebook_login_redirect_url").'/';
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$this->facebook_logout_url = base_url() . $this->ci->config->item("facebook_logout_redirect_url").'/';
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// init app with app id and secret
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$this->fb = new Facebook([
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'app_id' => $facebook_app_id, // Replace {app-id} with your app id
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'app_secret' => $facebook_app_secret,
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'default_graph_version' => 'v2.2',
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]);
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$this->helper = $this->fb->getRedirectLoginHelper();
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}
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/**
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* @return FB
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*/
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public function object()
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{
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return $this->fb;
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}
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/**
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* Check if user are logged in by checking if we have a Facebook
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* session active.
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*
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* @return mixed|boolean
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*/
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public function is_authenticated()
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{
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$access_token = $this->authenticate();
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if (isset($access_token))
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{
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return $access_token;
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}
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return false;
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}
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/**
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* Destroy our local Facebook session
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*/
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public function destroy_session()
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{
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$this->session->unset_userdata('fb_access_token');
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}
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public function getLoginUrl() {
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return $this->helper->getLoginUrl($this->facebook_login_url, $this->facebook_default_scope);
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}
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public function getLogoutUrl() {
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return $this->helper->getLogoutUrl($this->get_access_token(), $this->facebook_logout_url);
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}
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public function get_access_token() {
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return $this->session->userdata('fb_access_token');
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}
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/**
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* @return mixed
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*/
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private function get_expire_time()
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{
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return $this->session->userdata('fb_expire');
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}
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/**
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* @param DateTime $time
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*/
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private function set_expire_time(DateTime $time = null)
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{
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if ($time) {
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$this->session->set_userdata('fb_expire', $time->getTimestamp());
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}
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}
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public function authenticate()
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{
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$accessToken = $this->get_access_token();
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if ($accessToken && $this->get_expire_time() > (time() + 30) || $accessToken && !$this->get_expire_time())
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{
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$this->fb->setDefaultAccessToken($accessToken);
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return $accessToken;
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}
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// If we did not have a stored access token or if it has expired, try get a new access token
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try {
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$accessToken = $this->helper->getAccessToken($this->facebook_login_url);
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} catch(Facebook\Exceptions\FacebookResponseException $e) {
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// When Graph returns an error
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return $this->constructResult(NULL, 'Graph returned an error: ' . $e->getMessage());
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} catch(Facebook\Exceptions\FacebookSDKException $e) {
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// When validation fails or other local issues
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return $this->constructResult(NULL, 'Facebook SDK returned an error: ' . $e->getMessage());
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}
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if (! isset($accessToken)) {
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if ($this->helper->getError()) {
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/*header('HTTP/1.0 401 Unauthorized');
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echo "Error: " . $helper->getError() . "\n";
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echo "Error Code: " . $helper->getErrorCode() . "\n";
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echo "Error Reason: " . $helper->getErrorReason() . "\n";
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echo "Error Description: " . $helper->getErrorDescription() . "\n";
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*/
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return $this->constructResult(NULL, 'Unauthorized: '.$this->helper->getErrorDescription());
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} else {
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return $this->constructResult(NULL, 'Bad request');
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}
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}
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// The OAuth 2.0 client handler helps us manage access tokens
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$oAuth2Client = $this->fb->getOAuth2Client();
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// Get the access token metadata from /debug_token
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///$tokenMetadata = $oAuth2Client->debugToken($accessToken);
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if (! $accessToken->isLongLived()) {
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// Exchanges a short-lived access token for a long-lived one
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try {
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$accessToken = $oAuth2Client->getLongLivedAccessToken($accessToken);
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$this->set_expire_time($accessToken->getExpiresAt());
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$this->set_access_token($accessToken);
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$this->fb->setDefaultAccessToken($accessToken);
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} catch (Facebook\Exceptions\FacebookSDKException $e) {
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return $this->constructResult(NULL, "<p>Error getting long-lived access token: " . $this->helper->getMessage() . "</p>\n\n");
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}
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//var_dump($accessToken->getValue());
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}
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$_SESSION['fb_access_token'] = (string) $accessToken;
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return $accessToken;
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}
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public function getData($accessToken) {
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$user = NULL;
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try {
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// Returns a `Facebook\FacebookResponse` object
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if ($accessToken!="") {
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$response = $this->fb->get('/me?fields=id,name,email', $accessToken);
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$user = $response->getGraphUser();
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}
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} catch(Facebook\Exceptions\FacebookResponseException $e) {
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return $this->constructResult(NULL,'Graph returned an error: ' . $e->getMessage());
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} catch(Facebook\Exceptions\FacebookSDKException $e) {
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return $this->constructResult(NULL,'Facebook SDK returned an error: ' . $e->getMessage());
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}
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return $this->constructResult($user, NULL);
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}
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private function constructResult($me,$error) {
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$fb_data = array(
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'me' => $me,
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'error' => $error
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);
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$this->ci->session->set_userdata('fb_data', $fb_data);
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return $fb_data;
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}
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/**
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* Enables the use of CI super-global without having to define an extra variable.
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* I can't remember where I first saw this, so thank you if you are the original author.
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*
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* Borrowed from the Ion Auth library (http://benedmunds.com/ion_auth/)
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*
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* @param $var
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*
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* @return mixed
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*/
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public function __get($var)
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{
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return get_instance()->$var;
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}
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}
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