Facebook login

Hello guys, sorry for the question, which I have already tried immensely on google but I could not make it with any tutorial present. I would like to create a facebook login, but it seems that every tutorial is not fully functional.

Can you give me a guide or a small example of this? I would simply like a login with an obvious system of permissions (if logged in or not). I've tried a lot of guides, but it seems to always miss something or always make a mistake.

I used this library:
https://github.com/facebook/php-graph-sdk/contributors

and put it to application/third_party folder

usage:
1. I created Facebook.php library in appication/library:

PHP Code:

class Facebook {

    public function __construct($config =  array()) {

        require_once APPPATH.'third_party/facebook/vendor/autoload.php';
        $this->fb = new Facebook\Facebook($config);
        $this->permissions = ['public_profile','email'];
        $this->fb_helper = $this->fb->getRedirectLoginHelper();

    }
    
    public function loginURL($url) {
        return $this->fb_helper->getLoginUrl($url, $this->permissions);
    }
    
    public function authenticate($code = null) {
        return $this->client->authenticate($code);
    }
    
    public function getAccessToken() {
        try{
            $token = $this->fb_helper->getAccessToken();
            return array('token' => $token, 'message' => '');

        }catch(Facebook\Exceptions\FacebookResponseException $e)
        {
            // When Graph returns an error
            return array('token' => false,
                'message' => 'There was an error while trying to login using Facebook: ' . $e->getMessage()
                );
        }catch(Facebook\Exceptions\FacebookSDKException $e)
        {
            // When validation fails or other local issues
            return array('token' => false,
                'message' => 'Facebook SDK returned an error: ' . $e->getMessage()
                );
        }
    }
    
    public function setAccessToken($token) {
        if (!empty($token)) {
            $this->fb->setDefaultAccessToken($token);
        }
    }
    
    public function revokeToken() {
        return $this->client->revokeToken();
    }
    
    public function getUserInfo() {
        try{
            $response = $this->fb->get('/me?fields=id,first_name,last_name,name,email,verified');
            return array('user_info' => $response->getGraphUser(), 'message' => '');

        }catch(Facebook\Exceptions\FacebookResponseException $e)
        {
          // When Graph returns an error
            return array('user_info' => false,
                'message' => 'Could not retrieve user data: ' . $e->getMessage()
                );
        }
        catch(Facebook\Exceptions\FacebookSDKException $e)
        {
          // When validation fails or other local issues
            return array('user_info' => false,
                'message' => 'Facebook SDK returned an error: ' . $e->getMessage()
                );
        }
    }
    
} 


 
2. In login controller:

PHP Code:

   public function index(){
        //...
        $this->load->library('facebook', $this->config->item('fb_config'));
$callbackurltoyourwebsite = base_url() . 'login/facebookLogin';
        $data['facebook_login_link'] = $this->facebook->loginURL($callbackurltoyourwebsite);
        //facebook_login_link will be used in view as a facebook login button 
    } 


3. in login controller:

PHP Code:

   public function facebookLogin() 
    {
        $this->load->library('facebook', $this->config->item('fb_config'));
        $response = $this->facebook->getAccessToken();
        if($response['token'])
        {
            $token = $response['token'];
            $this->facebook->setAccessToken($token);
        }else{
            error_log($response['message']);
        }
        if(!empty($token))
        {
            $response = $this->facebook->getUserInfo();
            if($response['user_info']){
                $fbuser = $response['user_info'];
                $member_data = array();
                if ($fbuser['id'] && $fbuser['verified']) 
                {
                    $login_data['email'] = $fbuser['email'];
                    $member_data = $this->member_model->getmember($login_data);
                    if (empty($member_data)) //if there is no member with the same email address
                    {
                        //insert new member 
                        //then:
                        $this->_set_session_data($member_data);
                    }
                    else{
                        $this->_set_session_data($member_data);
                            redirect();
                    }
                }else{

                }
            }else{
            }
        }
    } 


your facebook configs in applicaton/config/config.php:

PHP Code:

$config['fb_config'] = array(
    'app_id'  => '',
    'app_secret' => '',
    'default_graph_version' => 'v2.5'); 


Thanks for your help, can you tell me where to upload the facebook sdk? And how to call the folder?

Thanks for your help, can you tell me where to upload the facebook sdk? And how to call the folder?

Everything is in my answer read carefully

Hello,

You can use my library : https://github.com/bvrignaud/ci-fb-ion-auth

Hi guys, I tried with a library but this error appears. It does not find the class. I inserted the Facebook "Facebook" SDK folder inside the Library. Where am I wrong?

An uncaught Exception was encountered

Type: Error

Message: Class 'Facebook\Facebook' not found

Filename: /home/mhd-01/www.augustani.it/htdocs/application/libraries/Facebook.php
Line Number: 65