Basic Http Authentication

httpauth.php

<?php

/**
 * Attempt to wrap Http Authentication into a separate class... 
 * 
 * Ideas and some code from FuelPHP Controller_Rest
 * https://github.com/fuel/fuel/blob/develop/fuel/core/classes/controller/rest.php
 *  
 */

class Cambiata_HttpAuth {

	// BASIC SECURITY FUNCTIONS ---------------------------------------------------------

	static public function basic_http_auth($callback_class, $callback_method) 
	{
		$username = NULL;
		$password = NULL;
		
		if (isset($_SERVER['PHP_AUTH_USER'])) 
		{ //Apache mod_php...
			$username = $_SERVER['PHP_AUTH_USER'];
			$password = $_SERVER['PHP_AUTH_PW'];
		} 
		elseif (isset($_SERVER['HTTP_AUTHENTICATION']))
		{ // Other servers...
			if (strpos(strtolower($_SERVER['HTTP_AUTHENTICATION']), 'basic') === 0) 
			{
				list($username, $password) = explode(':', base64_decode(substr($_SERVER['HTTP_AUTHENTICATION'], 6)));
			}
		}
		
		// check login result from callback function...
		$login_check = call_user_func(array($callback_class, $callback_method), $username, $password);
		
		// if not, use browser dialog
		if (!$login_check) self::http_auth_login_dialog();
		
	}

	
	
	
	
	const X_AUTH_TOKEN = "HTTP_X_AUTH_TOKEN";
	
	static public function header_token_auth($callback_class, $callback_method, $token_header_tag) 
	{
		// If token header isn't set, return false
		if (!isset($_SERVER[$token_header_tag])) self::login_fail();
		// Get the token
		$token = $_SERVER[$token_header_tag];
		// Check if token is valid from callback function...
		$login_check = call_user_func(array($callback_class, $callback_method), $token);
		if (!$login_check) self::login_fail();
	}

	
	//------------------------------------------------------------------------
	//------------------------------------------------------------------------
	//------------------------------------------------------------------------
	
	static private function http_auth_login_dialog() 
	{
		header('WWW-Authenticate: Basic realm="REST API"');
		self::login_fail();
	}

	static private function login_fail() 
	{
		header('HTTP/1.0 401 Unauthorized');
		header('HTTP/1.1 401 Unauthorized');
		exit('Not authorized.');
	}

}