<?php
  
  /**
  * ownCloud
  *
  * @author Frank Karlitschek
  * @copyright 2012 Robin Appelman icewind@owncloud.com
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
  * License as published by the Free Software Foundation; either
  * version 3 of the License, or any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU AFFERO GENERAL PUBLIC LICENSE for more details.
  *
  * You should have received a copy of the GNU Affero General Public
  * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
  *
  */
  
  /**
   * user backend using http auth requests
   */
  class OC_User_HTTP extends OC_User_Backend {
  	/**
  	 * split http://user@host/path into a user and url part

  	 * @param string $url

  	 * @return array
  	 */
  	private function parseUrl($url) {
  		$parts=parse_url($url);
  		$url=$parts['scheme'].'://'.$parts['host'];
  		if(isset($parts['port'])) {
  			$url.=':'.$parts['port'];
  		}
  		$url.=$parts['path'];
  		if(isset($parts['query'])) {
  			$url.='?'.$parts['query'];
  		}
  		return array($parts['user'], $url);
  
  	}
  
  	/**
  	 * check if an url is a valid login

  	 * @param string $url

  	 * @return boolean
  	 */
  	private function matchUrl($url) {
  		return ! is_null(parse_url($url, PHP_URL_USER));
  	}
  
  	/**

  	 * Check if the password is correct
  	 * @param string $uid The username
  	 * @param string $password The password
  	 * @return string

  	 *
  	 * Check if the password is correct without logging in the user
  	 * returns the user id or false
  	 */
  	public function checkPassword($uid, $password) {
  		if(!$this->matchUrl($uid)) {
  			return false;
  		}
  		list($user, $url)=$this->parseUrl($uid);
  
  		$ch = curl_init();
  		curl_setopt($ch, CURLOPT_URL, $url);
  		curl_setopt($ch, CURLOPT_USERPWD, $user.':'.$password);
  		curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
  
  		curl_exec($ch);
  
  		$status = curl_getinfo($ch, CURLINFO_HTTP_CODE);
  
  		curl_close($ch);

  		if($status === 200) {
  			return $uid;
  		}
  
  		return false;

  	}
  
  	/**

  	 * check if a user exists

  	 * @param string $uid the username
  	 * @return boolean
  	 */
  	public function userExists($uid) {
  		return $this->matchUrl($uid);
  	}
  
  	/**

  	* get the user's home directory

  	* @param string $uid the username

  	* @return string|false

  	*/
  	public function getHome($uid) {
  		if($this->userExists($uid)) {
  			return OC_Config::getValue( "datadirectory", OC::$SERVERROOT."/data" ) . '/' . $uid;
  		}else{
  			return false;
  		}
  	}

  }