Basic.php
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Basic.php
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	<?php

	namespace Sabre\HTTP\Auth;

	/**
	* HTTP Basic authentication utility.
	*
	* This class helps you setup basic auth. The process is fairly simple:
	*
	* 1. Instantiate the class.
	* 2. Call getCredentials (this will return null or a user/pass pair)
	* 3. If you didn't get valid credentials, call 'requireLogin'
	*
	* @copyright Copyright (C) 2009-2015 fruux GmbH (https://fruux.com/).
	* @author Evert Pot (http://evertpot.com/)
	* @license http://sabre.io/license/ Modified BSD License
	*/
	class Basic extends AbstractAuth {

	/**
	* This method returns a numeric array with a username and password as the
	* only elements.
	*
	* If no credentials were found, this method returns null.
	*
	* @return null\|array
	*/
	function getCredentials() {

	$auth = $this->request->getHeader('Authorization');

	if (!$auth) {
	return null;
	}

	if (strtolower(substr($auth, 0, 6)) !== 'basic ') {
	return null;
	}

	$credentials = explode(':', base64_decode(substr($auth, 6)), 2);

	if (2 !== count($credentials)) {
	return null;
	}

	return $credentials;

	}

	/**
	* This method sends the needed HTTP header and statuscode (401) to force
	* the user to login.
	*
	* @return void
	*/
	function requireLogin() {

	$this->response->addHeader('WWW-Authenticate', 'Basic realm="' . $this->realm . '"');
	$this->response->setStatus(401);

	}

	}