【CodeIgniter】Basic認証ライブラリ

Basic_auth.php

<?php
if (!defined('BASEPATH'))
	exit('No direct script access allowed');

class Basic_auth
{
	private $username = "username";
	
	private $password = "password";
	
	private $logged_in_key = 'logged_in';
	
	public function __construct(array $config = array())
	{
		$this->CI = & get_instance();
		$this->CI->load->library('session');
		
		if(count($config))
		{
			$this->initialize($config);
		}
	}
	
	public function initialize($config = array())
	{
		foreach ($config as $key => $val)
		{
			if (isset($this->$key))
			{
				$method = 'set_'.$key;

				if (method_exists($this, $method))
				{
					$this->$method($val);
				}
				else
				{
					$this->$key = $val;
				}
			}
		}
		return $this;
	}
	
	private function set_username($username)
	{
		$this->username = $username;
	}
	
	private function set_password($password)
	{
		$this->password = $password;		
	}
	
	private function get_username()
	{
		return $this->username;
	}
	
	private function get_password()
	{
		return $this->password;
	}
		
	public function login()
	{
		$logged_in = $this->CI->session->userdata($this->logged_in_key);

		if ($logged_in !== true)
		{
			if ($this->auth())
			{
				$this->CI->session->set_userdata($this->logged_in_key, true);
			} else
			{
				header('WWW-Authenticate: Basic realm="Private Page"');
				set_status_header("401");
				die("Please enter a valid username and password");
			}
		}
	}
	
	private function auth()
	{
		if (!$this->CI->input->server('PHP_AUTH_USER'))
		{
			return false;
		} else
		{
			if (($this->CI->input->server('PHP_AUTH_USER') == $this->get_username()) 
				&& ($this->CI->input->server('PHP_AUTH_PW') == $this->get_password()))
			{
				return true;
			} else
			{
				return false;
			}
		}
	}
}

Welcome.php

<?php
defined('BASEPATH') OR exit('No direct script access allowed');

class Welcome extends CI_Controller {


	public function index()
	{
		$this->load->view('welcome_message');
	}
	
	public function basic_auth()
	{
		$this->load->library('Basic_auth', array(
			'username' => 'username',
			'password' => 'password'
		));
		
		$this->basic_auth->login();
		
	}
}