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<?php
namespace Drupal\workflows;
use Drupal\Core\Access\AccessResult;
use Drupal\Core\Routing\Access\AccessInterface;
use Drupal\Core\Routing\RouteMatchInterface;
use Drupal\Core\Session\AccountInterface;
/**
* Provides an access check for state and transition operations.
*/
class WorkflowStateTransitionOperationsAccessCheck implements AccessInterface {
/**
* Checks access for operations of workflow states and transitions.
*
* The value of '_workflow_access' is used to check to kind of access that
* should be applied to a route in the context of a workflow and a state or
* transition. States and transitions can individually have access control
* applied to them for 'add', 'update' and 'delete'. By default workflows will
* use the admin permission 'administer workflows' for all of these
* operations, except for delete-state which checks there is at least one
* state, a state does not have data and it's not a required state.
*
* For the update and delete operations, a workflow and a state or transition
* is required in the route for the access check to be applied. For the "add"
* operation, only a workflow is required. The '_workflow_access' requirement
* translates into access checks on the workflow entity type in the formats:
* - "$operation-state:$state_id"
* - "$operation-transition:$transition_id"
*
* For example the following route definition with the path
* "/test-workflow/foo-state/delete" the 'delete-state:foo-state' operation
* will be checked:
* @code
* path: '/{workflow}/{workflow_state}/delete'
* requirements:
* _workflow_access: 'delete-state'
* @endcode
*
* @param \Drupal\Core\Routing\RouteMatchInterface $route_match
* The parametrized route.
* @param \Drupal\Core\Session\AccountInterface $account
* The currently logged in account.
*
* @return \Drupal\Core\Access\AccessResultInterface
* An access result.
*
* @throws \Exception
* Throws an exception when a route is defined with an invalid operation.
*/
public function access(RouteMatchInterface $route_match, AccountInterface $account) {
$workflow_operation = $this->getOperation($route_match);
if (!preg_match('/^(?<operation>add|update|delete)-(?<type>state|transition)$/', $workflow_operation, $matches)) {
throw new \Exception("Invalid _workflow_access operation '$workflow_operation' specified for route '{$route_match->getRouteName()}'.");
}
$parameters = $route_match->getParameters();
$workflow = $parameters->get('workflow');
if ($workflow && $matches['operation'] === 'add') {
return $workflow->access($workflow_operation, $account, TRUE);
}
if ($workflow && $type = $parameters->get(sprintf('workflow_%s', $matches['type']))) {
return $workflow->access(sprintf('%s:%s', $workflow_operation, $type), $account, TRUE);
}
return AccessResult::neutral();
}
/**
* Get the operation that will be used for the access check.
*
* @param \Drupal\Core\Routing\RouteMatchInterface $route_match
* The parametrized route.
*
* @return string
* The access operation.
*/
protected function getOperation(RouteMatchInterface $route_match) {
return $route_match->getRouteObject()->getRequirement('_workflow_access');
}
}
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