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<?php /** * Joomla! Content Management System * * @copyright (C) 2009 Open Source Matters, Inc. <https://www.joomla.org> * @license GNU General Public License version 2 or later; see LICENSE.txt */ namespace Joomla\CMS\Access; \defined('JPATH_PLATFORM') or die; /** * Rule class. * * @since 2.5.0 */ class Rule { /** * A named array * * @var array * @since 1.7.0 */ protected $data = array(); /** * Constructor. * * The input array must be in the form: array(-42 => true, 3 => true, 4 => false) * or an equivalent JSON encoded string. * * @param mixed $identities A JSON format string (probably from the database) or a named array. * * @since 1.7.0 */ public function __construct($identities) { // Convert string input to an array. if (\is_string($identities)) { $identities = json_decode($identities, true); } $this->mergeIdentities($identities); } /** * Get the data for the action. * * @return array A named array * * @since 1.7.0 */ public function getData() { return $this->data; } /** * Merges the identities * * @param mixed $identities An integer or array of integers representing the identities to check. * * @return void * * @since 1.7.0 */ public function mergeIdentities($identities) { if ($identities instanceof Rule) { $identities = $identities->getData(); } if (\is_array($identities)) { foreach ($identities as $identity => $allow) { $this->mergeIdentity($identity, $allow); } } } /** * Merges the values for an identity. * * @param integer $identity The identity. * @param boolean $allow The value for the identity (true == allow, false == deny). * * @return void * * @since 1.7.0 */ public function mergeIdentity($identity, $allow) { $identity = (int) $identity; $allow = (int) ((boolean) $allow); // Check that the identity exists. if (isset($this->data[$identity])) { // Explicit deny always wins a merge. if ($this->data[$identity] !== 0) { $this->data[$identity] = $allow; } } else { $this->data[$identity] = $allow; } } /** * Checks that this action can be performed by an identity. * * The identity is an integer where +ve represents a user group, * and -ve represents a user. * * @param mixed $identities An integer or array of integers representing the identities to check. * * @return mixed True if allowed, false for an explicit deny, null for an implicit deny. * * @since 1.7.0 */ public function allow($identities) { // Implicit deny by default. $result = null; // Check that the inputs are valid. if (!empty($identities)) { if (!\is_array($identities)) { $identities = array($identities); } foreach ($identities as $identity) { // Technically the identity just needs to be unique. $identity = (int) $identity; // Check if the identity is known. if (isset($this->data[$identity])) { $result = (boolean) $this->data[$identity]; // An explicit deny wins. if ($result === false) { break; } } } } return $result; } /** * Convert this object into a JSON encoded string. * * @return string JSON encoded string * * @since 1.7.0 */ public function __toString() { return json_encode($this->data); } }