Bearer.php
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Bearer.php
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	<?php

	namespace Sabre\HTTP\Auth;

	/**
	* HTTP Bearer authentication utility.
	*
	* This class helps you setup bearer auth. The process is fairly simple:
	*
	* 1. Instantiate the class.
	* 2. Call getToken (this will return null or a token as string)
	* 3. If you didn't get a valid token, call 'requireLogin'
	*
	* @copyright Copyright (C) 2009-2015 fruux GmbH (https://fruux.com/).
	* @author François Kooman (fkooman@tuxed.net)
	* @license http://sabre.io/license/ Modified BSD License
	*/
	class Bearer extends AbstractAuth {

	/**
	* This method returns a string with an access token.
	*
	* If no token was found, this method returns null.
	*
	* @return null\|string
	*/
	function getToken() {

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

	if (!$auth) {
	return null;
	}

	if (strtolower(substr($auth, 0, 7)) !== 'bearer ') {
	return null;
	}

	return substr($auth, 7);

	}

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

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

	}

	}