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<?php
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/**
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 * CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
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 * Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
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 *
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 * Licensed under The MIT License
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 * For full copyright and license information, please see the LICENSE.txt
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 * Redistributions of files must retain the above copyright notice.
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 *
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 * @copyright     Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
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 * @link          http://cakephp.org CakePHP(tm) Project
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 * @package       Cake.Controller.Component.Acl
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 * @since         CakePHP(tm) v 0.10.0.1076
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 * @license       http://www.opensource.org/licenses/mit-license.php MIT License
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 */
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App::uses('AclInterface', 'Controller/Component/Acl');
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/**
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 * IniAcl implements an access control system using an INI file. An example
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 * of the ini file used can be found in /config/acl.ini.php.
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 *
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 * @package       Cake.Controller.Component.Acl
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 */
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class IniAcl extends Object implements AclInterface {
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/**
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 * Array with configuration, parsed from ini file
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 *
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 * @var array
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 */
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	public $config = null;
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/**
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 * The Hash::extract() path to the user/aro identifier in the
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 * acl.ini file. This path will be used to extract the string
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 * representation of a user used in the ini file.
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 *
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 * @var string
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 */
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	public $userPath = 'User.username';
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/**
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 * Initialize method
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 *
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 * @param AclBase $component
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 * @return void
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 */
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	public function initialize(Component $component) {
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	}
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/**
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 * No op method, allow cannot be done with IniAcl
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 *
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 * @param string $aro ARO The requesting object identifier.
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 * @param string $aco ACO The controlled object identifier.
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 * @param string $action Action (defaults to *)
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 * @return boolean Success
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 */
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	public function allow($aro, $aco, $action = "*") {
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	}
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/**
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 * No op method, deny cannot be done with IniAcl
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 *
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 * @param string $aro ARO The requesting object identifier.
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 * @param string $aco ACO The controlled object identifier.
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 * @param string $action Action (defaults to *)
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 * @return boolean Success
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 */
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	public function deny($aro, $aco, $action = "*") {
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	}
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/**
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 * No op method, inherit cannot be done with IniAcl
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 *
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 * @param string $aro ARO The requesting object identifier.
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 * @param string $aco ACO The controlled object identifier.
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 * @param string $action Action (defaults to *)
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 * @return boolean Success
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 */
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	public function inherit($aro, $aco, $action = "*") {
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	}
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/**
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 * Main ACL check function. Checks to see if the ARO (access request object) has access to the
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 * ACO (access control object).Looks at the acl.ini.php file for permissions
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 * (see instructions in /config/acl.ini.php).
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 *
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 * @param string $aro ARO
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 * @param string $aco ACO
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 * @param string $action Action
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 * @return boolean Success
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 */
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	public function check($aro, $aco, $action = null) {
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		if (!$this->config) {
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			$this->config = $this->readConfigFile(APP . 'Config' . DS . 'acl.ini.php');
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		}
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		$aclConfig = $this->config;
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		if (is_array($aro)) {
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			$aro = Hash::get($aro, $this->userPath);
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		}
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		if (isset($aclConfig[$aro]['deny'])) {
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			$userDenies = $this->arrayTrim(explode(",", $aclConfig[$aro]['deny']));
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			if (array_search($aco, $userDenies)) {
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				return false;
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			}
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		}
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		if (isset($aclConfig[$aro]['allow'])) {
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			$userAllows = $this->arrayTrim(explode(",", $aclConfig[$aro]['allow']));
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			if (array_search($aco, $userAllows)) {
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				return true;
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			}
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		}
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		if (isset($aclConfig[$aro]['groups'])) {
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			$userGroups = $this->arrayTrim(explode(",", $aclConfig[$aro]['groups']));
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			foreach ($userGroups as $group) {
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				if (array_key_exists($group, $aclConfig)) {
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					if (isset($aclConfig[$group]['deny'])) {
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						$groupDenies = $this->arrayTrim(explode(",", $aclConfig[$group]['deny']));
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						if (array_search($aco, $groupDenies)) {
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							return false;
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						}
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					}
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					if (isset($aclConfig[$group]['allow'])) {
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						$groupAllows = $this->arrayTrim(explode(",", $aclConfig[$group]['allow']));
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						if (array_search($aco, $groupAllows)) {
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							return true;
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						}
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					}
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				}
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			}
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		}
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		return false;
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	}
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/**
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 * Parses an INI file and returns an array that reflects the
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 * INI file's section structure. Double-quote friendly.
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 *
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 * @param string $filename File
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 * @return array INI section structure
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 */
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	public function readConfigFile($filename) {
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		App::uses('IniReader', 'Configure');
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		$iniFile = new IniReader(dirname($filename) . DS);
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		return $iniFile->read(basename($filename));
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	}
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/**
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 * Removes trailing spaces on all array elements (to prepare for searching)
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 *
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 * @param array $array Array to trim
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 * @return array Trimmed array
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 */
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	public function arrayTrim($array) {
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		foreach ($array as $key => $value) {
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			$array[$key] = trim($value);
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		}
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		array_unshift($array, "");
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		return $array;
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	}
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}