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Current File : /home/utripoli/www/journal/lib/pkp/classes/security/authorization/AuthorizationPolicy.inc.php
<?php
/**
 * @file classes/security/authorization/AuthorizationPolicy.inc.php
 *
 * Copyright (c) 2014-2021 Simon Fraser University
 * Copyright (c) 2000-2021 John Willinsky
 * Distributed under the GNU GPL v3. For full terms see the file docs/COPYING.
 *
 * @class AuthorizationPolicy
 * @ingroup security_authorization
 *
 * @brief Class to represent an authorization policy.
 *
 * We use some of the terminology specified in the draft XACML V3.0 standard,
 * please see <http://www.oasis-open.org/committees/tc_home.php?wg_abbrev=xacml>
 * for details.
 *
 * We try to stick closely enough to XACML concepts to make sure that
 * future improvements to the authorization framework can be done in a
 * consistent manner.
 *
 * This of course doesn't mean that we are "XACML compliant" in any way.
 */

define ('AUTHORIZATION_PERMIT', 0x01);
define ('AUTHORIZATION_DENY', 0x02);

define ('AUTHORIZATION_ADVICE_DENY_MESSAGE', 0x01);
define ('AUTHORIZATION_ADVICE_CALL_ON_DENY', 0x02);

class AuthorizationPolicy {
	/** @var array advice to be returned to the decision point */
	var $_advice = array();

	/**
	 * @var array a list of authorized context objects that should be
	 *  returned to the caller
	 */
	var $_authorizedContext = array();


	/**
	 * Constructor
	 * @param $message string
	 */
	function __construct($message = null) {
		if (!is_null($message)) $this->setAdvice(AUTHORIZATION_ADVICE_DENY_MESSAGE, $message);
	}

	//
	// Setters and Getters
	//
	/**
	 * Set an advice
	 * @param $adviceType integer
	 * @param $adviceContent mixed
	 */
	function setAdvice($adviceType, $adviceContent) {
		$this->_advice[$adviceType] = $adviceContent;
	}

	/**
	 * Whether this policy implements
	 * the given advice type.
	 * @param $adviceType integer
	 * @return boolean
	 */
	function hasAdvice($adviceType) {
		return isset($this->_advice[$adviceType]);
	}

	/**
	 * Get advice for the given advice type.
	 * @param $adviceType integer
	 * @return mixed
	 */
	function &getAdvice($adviceType) {
		if ($this->hasAdvice($adviceType)) {
			return $this->_advice[$adviceType];
		} else {
			$nullVar = null;
			return $nullVar;
		}
	}

	/**
	 * Add an object to the authorized context
	 * @param $assocType integer
	 * @param $authorizedObject mixed
	 */
	function addAuthorizedContextObject($assocType, &$authorizedObject) {
		$this->_authorizedContext[$assocType] =& $authorizedObject;
	}

	/**
	 * Check whether an object already exists in the
	 * authorized context.
	 * @param $assocType integer
	 * @return boolean
	 */
	function hasAuthorizedContextObject($assocType) {
		return isset($this->_authorizedContext[$assocType]);
	}

	/**
	 * Retrieve an object from the authorized context
	 * @param $assocType integer
	 * @return mixed will return null if the context
	 *  for the given assoc type does not exist.
	 */
	function &getAuthorizedContextObject($assocType) {
		if ($this->hasAuthorizedContextObject($assocType)) {
			return $this->_authorizedContext[$assocType];
		} else {
			$nullVar = null;
			return $nullVar;
		}
	}

	/**
	 * Set the authorized context
	 * @return array
	 */
	function setAuthorizedContext(&$authorizedContext) {
		$this->_authorizedContext =& $authorizedContext;
	}

	/**
	 * Get the authorized context
	 * @return array
	 */
	function &getAuthorizedContext() {
		return $this->_authorizedContext;
	}

	//
	// Protected template methods to be implemented by sub-classes
	//
	/**
	 * Whether this policy applies.
	 * @return boolean
	 */
	function applies() {
		// Policies apply by default
		return true;
	}

	/**
	 * This method must return a value of either
	 * AUTHORIZATION_DENY or AUTHORIZATION_PERMIT.
	 */
	function effect() {
		// Deny by default.
		return AUTHORIZATION_DENY;
	}
}

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