Linkedin login / Signup in codeigniter php framework with mysql

Linkedin login or signup script is for easy way login in your website instead of login process registration. this linkedin login script is very simple, in this linkedin login script they are providing email aslo to check exsiting users in mysql database. lets see the step by step process to make linkedin app and step process. 

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FLOW DIAGRAM OF LINKEDIN LOGIN

CONFIG AND INSTALLATION 

STEP 1 : We need to create linkedin app to clientid / api id and clientsecret key. CREATE APP LINK 

STEP 2 : Then we need to configure all the callback redirecting url's while creating app.

STEP 3 : After successfully creation of linkedin app, We have to configure our codeigniter files in your local machine. 

STEP 4 : Then configure all the config file while are important. like autoload, config, database etc.

STEP 5 : Add linkedin.php file in application -> config folder.

STEP 6 : Change clientid and clientsecret key + redirect url as we have given demo video. 

STEP 7 : Add lnkedin library files in application -> libraries folder.

STEP 8 : CONTROLLER

<?php
defined('BASEPATH') OR exit('No direct script access allowed');
error_reporting(0);
class Welcome extends CI_Controller {

public function __construct()
{
parent::__construct();
$this->load->library('linkedin');
$this->load->config('linkedin');
$this->load->helper('url');
$this->load->model('welcome_model','welcome'); 
}


public function index()
{

$this->load->view('login');

}




public function linkedin_login() {

$user = array();
$ci = get_instance(); // CI_Loader instance
$ci->load->config('linkedin');

//Include the linkedin api php libraries
include_once APPPATH."libraries/Linkedin/http.php";
include_once APPPATH."libraries/Linkedin/oauth_client.php";

$linkedin_api_key = $ci->config->item('linkedin_api_key');
$linkedin_api_secret = $ci->config->item('linkedin_api_secret');
$linkedin_redirect_url = $ci->config->item('linkedin_redirect_url');
$linkedin_scope = $ci->config->item('linkedin_scope');

if((isset($_REQUEST["oauth_init"]) && $_REQUEST["oauth_init"] == '1' ) || 
(isset($_GET["oauth_init"]) && $_GET["oauth_init"] == '1' ) || 
(isset($_REQUEST['oauth_token']) && isset($_REQUEST['oauth_verifier'])) || 
(isset($_GET['oauth_token']) && isset($_GET['oauth_verifier'])) ){


$client = new oauth_client_class;
$client->client_id = $linkedin_api_key;
$client->client_secret = $linkedin_api_secret;
$client->redirect_uri = base_url().$linkedin_redirect_url;
$client->scope = $linkedin_scope;
$client->debug = false;
$client->debug_http = true;
$application_line = __LINE__;

//If authentication returns success
if($success = $client->Initialize()){
if(($success = $client->Process())){
if(strlen($client->authorization_error)){
$client->error = $client->authorization_error;
$success = false;
}elseif(strlen($client->access_token)){
$success = $client->CallAPI('http://api.linkedin.com/v1/people/~:(id,
email-address,first-name,last-name,location,picture-urls::(original),
public-profile-url,formatted-name)', 
'GET',
array('format'=>'json'),
array('FailOnAccessError'=>true), $user);
}
}
$success = $client->Finalize($success);
}

if($client->exit) exit;


$checkemail = $this->db->query('select id,email 
from users where email = "'.$user->emailAddress.'"');
$emailresult = $checkemail->result_array();
if($emailresult[0]['email'] != $user->emailAddress){
$user_information  = array(
'name'           => $user->formattedName,
'first_name'     => $user->firstName,
'last_name'      => $user->lastName,
'location'       => $user->location->name,
'email'          => $user->emailAddress,
'gender'         => '',
'source_id'      => $user->id,
'source'         => 'LinkedIn',
'profilepicture' => $user->pictureUrls->values[0],
);
$this->welcome->insert_user($user_information);
$insert_id = $this->db->insert_id();
$fetchuser = $this->db->query('select * 
        from users where id = "'.$insert_id.'"');
$userdata = $fetchuser->result_array();
$this->session->set_userdata ( 'user_id', $userdata[0]['id'] );
$this->session->set_userdata ( 'user_name', $userdata[0]['name'] );
$this->session->set_userdata ( 'user_email', $userdata[0]['email'] );
$this->session->set_userdata ( 'user_gender', $userdata[0]['gender'] );
$this->session->set_userdata ( 'user_source', $userdata[0]['source'] );
$this->session->set_userdata ( 'user_source_id', $userdata[0]['source_id'] );
}else if($emailresult[0]['email'] == $user->emailAddress){
$update_id = array('source_id'  => $user->id,
            'source'  => 'LinkedIn',
            'profilepicture'=>$user->pictureUrls->values[0],
            'location'=>$user->location->name);
$this->db->where('id', $emailresult[0]['id']);
$this->db->update('users', $update_id);
$fetchuser = $this->db->query('select * 
    from users where id = "'.$emailresult[0]['id'].'"');
$userdata = $fetchuser->result_array();
$this->session->set_userdata ( 'user_id', $userdata[0]['id'] );
$this->session->set_userdata ( 'user_name', $userdata[0]['name'] );
$this->session->set_userdata ( 'user_email', $userdata[0]['email'] );
$this->session->set_userdata ( 'user_gender', $userdata[0]['gender'] );
$this->session->set_userdata ( 'user_source', $userdata[0]['source'] );
$this->session->set_userdata ( 'user_source_id', $userdata[0]['source_id'] );
}
$data['userprofile'] = $this->session->userdata();
redirect('welcome/profile', $data);

}else{
echo 'We are unable fetch your Linkedin information.'; exit;
}



}






public function profile()
{
if($this->session->userdata('user_id') != ''){
$this->data['userprofile']= $this->welcome->fetch_user();
$this->load->view('profile', $this->data, FALSE);
}else{
redirect('welcome', $data);
}
}





public function logout()
{
$this->session->sess_destroy();
redirect(base_url(), redirect);
}


}

STEP 9 : MODEL

Welcome_model.php

<?php
class Welcome_model extends CI_Model
{
public function __construct()
{
parent::__construct();
}


public function insert_user($data){
$this->db->insert('users', $data); 
return TRUE;
}

public function fetch_user(){
$query=$this->db->query("SELECT *
 FROM users
 WHERE id = '".$this->session->userdata('user_id')."' ");
//return $query->result();
return $query->row(0);
}






}

STEP 10 : VIEW

1. profile.php 

2. login.php / welcome_message.php

PROFILE.PHP file to display user information after successfull login.

LOGIN.PHP for give login link url as the below code.

<a href="<?php echo $this->linkedin->loginURL(); ?>">
<span class="fa fa-linkedin"></span> Sign in with LinkedIn
</a>

i hope you like this post, this will be very useful to you to make linkedin login to make reigistration easy. For video demo and installation configuration see the link.