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<?php
namespace Drupal\Core\Access;
/**
* Interface for access result value objects.
*
* IMPORTANT NOTE: You have to call isAllowed() when you want to know whether
* someone has access. Just using
* @code
* if ($access_result) {
* // The user has access!
* }
* else {
* // The user doesn't have access!
* }
* @endcode
* would never enter the else-statement and hence introduce a critical security
* issue.
*/
interface AccessResultInterface {
/**
* Checks whether this access result indicates access is explicitly allowed.
*
* @return bool
* When TRUE then isForbidden() and isNeutral() are FALSE.
*/
public function isAllowed();
/**
* Checks whether this access result indicates access is explicitly forbidden.
*
* This is a kill switch — both orIf() and andIf() will result in
* isForbidden() if either results are isForbidden().
*
* @return bool
* When TRUE then isAllowed() and isNeutral() are FALSE.
*/
public function isForbidden();
/**
* Checks whether this access result indicates access is not yet determined.
*
* @return bool
* When TRUE then isAllowed() and isForbidden() are FALSE.
*/
public function isNeutral();
/**
* Combine this access result with another using OR.
*
* When OR-ing two access results, the result is:
* - isForbidden() in either ⇒ isForbidden()
* - otherwise if isAllowed() in either ⇒ isAllowed()
* - otherwise both must be isNeutral() ⇒ isNeutral()
*
* Truth table:
* @code
* |A N F
* --+-----
* A |A A F
* N |A N F
* F |F F F
* @endcode
*
* @param \Drupal\Core\Access\AccessResultInterface $other
* The other access result to OR this one with.
*
* @return static
*/
public function orIf(AccessResultInterface $other);
/**
* Combine this access result with another using AND.
*
* When AND-ing two access results, the result is:
* - isForbidden() in either ⇒ isForbidden()
* - otherwise, if isAllowed() in both ⇒ isAllowed()
* - otherwise, one of them is isNeutral() ⇒ isNeutral()
*
* Truth table:
* @code
* |A N F
* --+-----
* A |A N F
* N |N N F
* F |F F F
* @endcode
*
* @param \Drupal\Core\Access\AccessResultInterface $other
* The other access result to AND this one with.
*
* @return static
*/
public function andIf(AccessResultInterface $other);
}