[PHP] CodeIgniter 與 Facebook PHP SDK v4 整合筆記 @ Ubuntu 14.04

整個流程並主要是把 Facebook PHP sdk v4 source code 下載到 ci_proj/application/libraries 中，接著撰寫一隻 ci library: facebook.php 來橋接一下，就差不多可以收工了。在此謹驗證收到的 facebook token 是否有效，其他部分並不實作：

$ cd /path/ci_proj/application/libraries
$ git clone https://github.com/facebook/facebook-php-sdk-v4.git
$ ln -s facebook-php-sdk-v4 facebook

建立 Facebook 相關 config:

$ vim /path/ci_proj/application/config/facebook.php
<?php defined('BASEPATH') OR exit('No direct script access allowed');
$config['facebook']['api_id'] = 'FACEBOOK APP ID';
$config['facebook']['app_secret'] = 'FACEBOOK APP SECRET KEY';

編輯橋接的 library 用法:

$ vim /path/ci_proj/application/libraries/facebook.php

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
require_once APPPATH . 'libraries/facebook/autoload.php';

use Facebook\FacebookRedirectLoginHelper;
use Facebook\FacebookSession;
use Facebook\FacebookRequest;
use Facebook\GraphUser;
use Facebook\FacebookRequestException;

class Facebook {
var $ci;
var $helper;
var $session;
var $permissions;

public function __construct() {
$this->ci =& get_instance();
$this->ci->load->config('facebook');
$this->permissions = $this->ci->config->item('permissions', 'facebook');
FacebookSession::setDefaultApplication( $this->ci->config->item('api_id', 'facebook'), $this->ci->config->item('app_secret', 'facebook') );
        }
public function token_validation($token) {
try {
$this->session = new FacebookSession( $token );
if ( $this->session->validate() )
return true;
} catch ( Exception $e ) {
}
$this->session = null;
return false;
}
public function get_user($token = NULL) {
if ( $this->session || (!empty($token) && $this->token_validation($token)) ) {
$request = ( new FacebookRequest( $this->session, 'GET', '/me' ) )->execute();
$user = $request->getGraphObject()->asArray();
return $user;
}
return false;
}
}

使用方式：

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
class Test extends CI_Controller {
public function index()
{
$this->load->config('facebook');
$this->load->library('facebook');
$output = array(
'reqeusts' => $_REQUEST,
'app_id' => $this->config->item('api_id', 'facebook'),
'user_id' => $this->facebook->get_user($_REQUEST['token'])
);
$this->output->set_content_type('application/json')->set_output(json_encode($output));
        }
}