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PhabricatorExtendedPolicyInterface.php
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Sat, Nov 30, 03:27

PhabricatorExtendedPolicyInterface.php
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<?php
/**
* Allows an object to define a more complex policy than it can with
* @{interface:PhabricatorPolicyInterface} alone.
*
* Some objects have complex policies which depend on the policies of other
* objects. For example, users can generally only see a Revision in
* Differential if they can also see the Repository it belongs to.
*
* These policies are normally enforced implicitly in the Query layer, by
* discarding objects which have related objects that can not be loaded. In
* most cases this has the same effect as really applying these policy checks
* would.
*
* However, in some cases an object's policies are later checked by a different
* viewer. For example, before we execute Herald rules, we check that the rule
* owners can see the object we are about to evaluate.
*
* In these cases, we need to account for these complex policies. We could do
* this by reloading the object over and over again for each viewer, but this
* implies a large performance cost. Instead, extended policies make it
* efficient to check policies against an object for multiple viewers.
*/
interface PhabricatorExtendedPolicyInterface {
/**
* Get the extended policy for an object.
*
* Return a list of additional policy checks that the viewer must satisfy
* in order to have the specified capability. This allows you to encode rules
* like "to see a revision, the viewer must also be able to see the repository
* it belongs to".
*
* For example, to specify that the viewer must be able to see some other
* object in order to see this one, you could return:
*
* return array(
* array($other_object, PhabricatorPolicyCapability::CAN_VIEW),
* // ...
* );
*
* If you don't have the actual object you want to check, you can return its
* PHID instead:
*
* return array(
* array($other_phid, PhabricatorPolicyCapability::CAN_VIEW),
* // ...
* );
*
* You can return a list of capabilities instead of a single capability if
* you want to require multiple capabilities on a single object:
*
* return array(
* array(
* $other_object,
* array(
* PhabricatorPolicyCapability::CAN_VIEW,
* PhabricatorPolicyCapability::CAN_EDIT,
* ),
* ),
* // ...
* );
*
* @param const Capability being tested.
* @param PhabricatorUser Viewer whose capabilities are being tested.
* @return list<pair<wild, wild>> List of extended policies.
*/
public function getExtendedPolicy($capability, PhabricatorUser $viewer);
}
// TEMPLATE IMPLEMENTATION /////////////////////////////////////////////////////
/* -( PhabricatorExtendedPolicyInterface )--------------------------------- */
/*
public function getExtendedPolicy($capability, PhabricatorUser $viewer) {
$extended = array();
switch ($capability) {
case PhabricatorPolicyCapability::CAN_VIEW:
// ...
break;
}
return $extended;
}
*/

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