Merging upstream version 1.1.2.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

14 files changed, 121 insertions, 100 deletions

diff --git a/application/forms/Command/CommandForm.php b/application/forms/Command/CommandForm.php
index a535c6d..49a0565 100644
--- a/application/forms/Command/CommandForm.php
+++ b/application/forms/Command/CommandForm.php
@@ -5,8 +5,8 @@
 namespace Icinga\Module\Icingadb\Forms\Command;
 
 use ArrayIterator;
+use Countable;
 use Exception;
-use Generator;
 use Icinga\Application\Logger;
 use Icinga\Module\Icingadb\Command\IcingaCommand;
 use Icinga\Module\Icingadb\Command\Transport\CommandTransport;
@@ -16,6 +16,8 @@ use Icinga\Web\Session;
 use ipl\Html\Form;
 use ipl\Orm\Model;
 use ipl\Web\Common\CsrfCounterMeasure;
+use Iterator;
+use IteratorIterator;
 use Traversable;
 
 abstract class CommandForm extends Form
@@ -25,7 +27,7 @@ abstract class CommandForm extends Form
 
     protected $defaultAttributes = ['class' => 'icinga-form icinga-controls'];
 
-    /** @var mixed */
+    /** @var (Traversable<Model>&Countable)|array<Model> */
     protected $objects;
 
     /** @var bool */
@@ -43,7 +45,7 @@ abstract class CommandForm extends Form
     /**
      * Set the objects to issue the command for
      *
-     * @param mixed $objects A traversable that is also countable
+     * @param (Traversable<Model>&Countable)|array<Model> $objects A traversable that is also countable
      *
      * @return $this
      */
@@ -57,7 +59,7 @@ abstract class CommandForm extends Form
     /**
      * Get the objects to issue the command for
      *
-     * @return mixed
+     * @return (Traversable<Model>&Countable)|array<Model>
      */
     public function getObjects()
     {
@@ -105,11 +107,11 @@ abstract class CommandForm extends Form
     /**
      * Get the commands to issue for the given objects
      *
-     * @param Traversable<Model> $objects
+     * @param Iterator<Model> $objects
      *
      * @return Traversable<IcingaCommand>
      */
-    abstract protected function getCommands(Traversable $objects): Traversable;
+    abstract protected function getCommands(Iterator $objects): Traversable;
 
     protected function assemble()
     {
@@ -123,10 +125,15 @@ abstract class CommandForm extends Form
 
     protected function onSuccess()
     {
-        $errors = [];
         $objects = $this->getObjects();
+        if (is_array($objects)) {
+            $objects = new ArrayIterator($objects);
+        } else {
+            $objects = new IteratorIterator($objects);
+        }
 
-        foreach ($this->getCommands(is_array($objects) ? new ArrayIterator($objects) : $objects) as $command) {
+        $errors = [];
+        foreach ($this->getCommands($objects) as $command) {
             try {
                 $this->sendCommand($command);
             } catch (Exception $e) {
@@ -159,21 +166,4 @@ abstract class CommandForm extends Form
     {
         (new CommandTransport())->send($command);
     }
-
-    /**
-     * Yield the $objects the currently logged in user has the permission $permission for
-     *
-     * @param string      $permission
-     * @param Traversable $objects
-     *
-     * @return Generator
-     */
-    protected function filterGrantedOn(string $permission, Traversable $objects): Generator
-    {
-        foreach ($objects as $object) {
-            if ($this->isGrantedOn($permission, $object)) {
-                yield $object;
-            }
-        }
-    }
 }
diff --git a/application/forms/Command/Instance/ToggleInstanceFeaturesForm.php b/application/forms/Command/Instance/ToggleInstanceFeaturesForm.php
index cf14db8..86c0bd1 100644
--- a/application/forms/Command/Instance/ToggleInstanceFeaturesForm.php
+++ b/application/forms/Command/Instance/ToggleInstanceFeaturesForm.php
@@ -8,6 +8,7 @@ use Icinga\Module\Icingadb\Command\Instance\ToggleInstanceFeatureCommand;
 use Icinga\Module\Icingadb\Forms\Command\CommandForm;
 use Icinga\Web\Notification;
 use ipl\Web\FormDecorator\IcingaFormDecorator;
+use Iterator;
 use Traversable;
 
 class ToggleInstanceFeaturesForm extends CommandForm
@@ -133,7 +134,7 @@ class ToggleInstanceFeaturesForm extends CommandForm
     {
     }
 
-    protected function getCommands(Traversable $objects): Traversable
+    protected function getCommands(Iterator $objects): Traversable
     {
         foreach ($this->features as $feature => $spec) {
             $featureState = $this->getElement($feature)->isChecked();
diff --git a/application/forms/Command/Object/AcknowledgeProblemForm.php b/application/forms/Command/Object/AcknowledgeProblemForm.php
index 81b93e2..f5e7923 100644
--- a/application/forms/Command/Object/AcknowledgeProblemForm.php
+++ b/application/forms/Command/Object/AcknowledgeProblemForm.php
@@ -4,6 +4,7 @@
 
 namespace Icinga\Module\Icingadb\Forms\Command\Object;
 
+use CallbackFilterIterator;
 use DateInterval;
 use DateTime;
 use Icinga\Application\Config;
@@ -14,9 +15,11 @@ use Icinga\Web\Notification;
 use ipl\Html\Attributes;
 use ipl\Html\HtmlElement;
 use ipl\Html\Text;
+use ipl\Orm\Model;
 use ipl\Validator\CallbackValidator;
 use ipl\Web\FormDecorator\IcingaFormDecorator;
 use ipl\Web\Widget\Icon;
+use Iterator;
 use Traversable;
 
 use function ipl\Stdlib\iterable_value_first;
@@ -186,10 +189,13 @@ class AcknowledgeProblemForm extends CommandForm
         (new IcingaFormDecorator())->decorate($this->getElement('btn_submit'));
     }
 
-    protected function getCommands(Traversable $objects): Traversable
+    protected function getCommands(Iterator $objects): Traversable
     {
-        $granted = $this->filterGrantedOn('icingadb/command/acknowledge-problem', $objects);
+        $granted = new CallbackFilterIterator($objects, function (Model $object): bool {
+            return $this->isGrantedOn('icingadb/command/acknowledge-problem', $object);
+        });
 
+        $granted->rewind(); // Forwards the pointer to the first element
         if ($granted->valid()) {
             $command = new AcknowledgeProblemCommand();
             $command->setObjects($granted);
diff --git a/application/forms/Command/Object/AddCommentForm.php b/application/forms/Command/Object/AddCommentForm.php
index 9cd0754..e991e84 100644
--- a/application/forms/Command/Object/AddCommentForm.php
+++ b/application/forms/Command/Object/AddCommentForm.php
@@ -4,6 +4,7 @@
 
 namespace Icinga\Module\Icingadb\Forms\Command\Object;
 
+use CallbackFilterIterator;
 use DateInterval;
 use DateTime;
 use Icinga\Application\Config;
@@ -14,9 +15,11 @@ use Icinga\Web\Notification;
 use ipl\Html\Attributes;
 use ipl\Html\HtmlElement;
 use ipl\Html\Text;
+use ipl\Orm\Model;
 use ipl\Validator\CallbackValidator;
 use ipl\Web\FormDecorator\IcingaFormDecorator;
 use ipl\Web\Widget\Icon;
+use Iterator;
 use Traversable;
 
 use function ipl\Stdlib\iterable_value_first;
@@ -141,10 +144,13 @@ class AddCommentForm extends CommandForm
         (new IcingaFormDecorator())->decorate($this->getElement('btn_submit'));
     }
 
-    protected function getCommands(Traversable $objects): Traversable
+    protected function getCommands(Iterator $objects): Traversable
     {
-        $granted = $this->filterGrantedOn('icingadb/command/comment/add', $objects);
+        $granted = new CallbackFilterIterator($objects, function (Model $object): bool {
+            return $this->isGrantedOn('icingadb/command/comment/add', $object);
+        });
 
+        $granted->rewind(); // Forwards the pointer to the first element
         if ($granted->valid()) {
             $command = new AddCommentCommand();
             $command->setObjects($granted);
diff --git a/application/forms/Command/Object/CheckNowForm.php b/application/forms/Command/Object/CheckNowForm.php
index b7a506c..eb1e03b 100644
--- a/application/forms/Command/Object/CheckNowForm.php
+++ b/application/forms/Command/Object/CheckNowForm.php
@@ -4,11 +4,13 @@
 
 namespace Icinga\Module\Icingadb\Forms\Command\Object;
 
-use Generator;
+use CallbackFilterIterator;
 use Icinga\Module\Icingadb\Command\Object\ScheduleCheckCommand;
 use Icinga\Module\Icingadb\Forms\Command\CommandForm;
 use Icinga\Web\Notification;
+use ipl\Orm\Model;
 use ipl\Web\Widget\Icon;
+use Iterator;
 use Traversable;
 
 class CheckNowForm extends CommandForm
@@ -44,22 +46,17 @@ class CheckNowForm extends CommandForm
         );
     }
 
-    protected function getCommands(Traversable $objects): Traversable
+    protected function getCommands(Iterator $objects): Traversable
     {
-        $granted = (function () use ($objects): Generator {
-            foreach ($objects as $object) {
-                if (
-                    $this->isGrantedOn('icingadb/command/schedule-check', $object)
-                    || (
-                        $object->active_checks_enabled
-                        && $this->isGrantedOn('icingadb/command/schedule-check/active-only', $object)
-                    )
-                ) {
-                    yield $object;
-                }
-            }
-        })();
+        $granted = new CallbackFilterIterator($objects, function (Model $object): bool {
+            return $this->isGrantedOn('icingadb/command/schedule-check', $object)
+                || (
+                    $object->active_checks_enabled
+                    && $this->isGrantedOn('icingadb/command/schedule-check/active-only', $object)
+                );
+        });
 
+        $granted->rewind(); // Forwards the pointer to the first element
         if ($granted->valid()) {
             $command = new ScheduleCheckCommand();
             $command->setObjects($granted);
diff --git a/application/forms/Command/Object/DeleteCommentForm.php b/application/forms/Command/Object/DeleteCommentForm.php
index 25275ba..a35fc2e 100644
--- a/application/forms/Command/Object/DeleteCommentForm.php
+++ b/application/forms/Command/Object/DeleteCommentForm.php
@@ -4,12 +4,14 @@
 
 namespace Icinga\Module\Icingadb\Forms\Command\Object;
 
-use Generator;
+use CallbackFilterIterator;
 use Icinga\Module\Icingadb\Command\Object\DeleteCommentCommand;
 use Icinga\Module\Icingadb\Forms\Command\CommandForm;
 use Icinga\Web\Notification;
+use ipl\Orm\Model;
 use ipl\Web\Common\RedirectOption;
 use ipl\Web\Widget\Icon;
+use Iterator;
 use Traversable;
 
 class DeleteCommentForm extends CommandForm
@@ -54,16 +56,13 @@ class DeleteCommentForm extends CommandForm
         );
     }
 
-    protected function getCommands(Traversable $objects): Traversable
+    protected function getCommands(Iterator $objects): Traversable
     {
-        $granted = (function () use ($objects): Generator {
-            foreach ($objects as $object) {
-                if ($this->isGrantedOn('icingadb/command/comment/delete', $object->{$object->object_type})) {
-                    yield $object;
-                }
-            }
-        })();
+        $granted = new CallbackFilterIterator($objects, function (Model $object): bool {
+            return $this->isGrantedOn('icingadb/command/comment/delete', $object->{$object->object_type});
+        });
 
+        $granted->rewind(); // Forwards the pointer to the first element
         if ($granted->valid()) {
             $command = new DeleteCommentCommand();
             $command->setObjects($granted);
diff --git a/application/forms/Command/Object/DeleteDowntimeForm.php b/application/forms/Command/Object/DeleteDowntimeForm.php
index 5f695b9..b13bcc5 100644
--- a/application/forms/Command/Object/DeleteDowntimeForm.php
+++ b/application/forms/Command/Object/DeleteDowntimeForm.php
@@ -4,12 +4,14 @@
 
 namespace Icinga\Module\Icingadb\Forms\Command\Object;
 
-use Generator;
+use CallbackFilterIterator;
 use Icinga\Module\Icingadb\Command\Object\DeleteDowntimeCommand;
 use Icinga\Module\Icingadb\Forms\Command\CommandForm;
 use Icinga\Web\Notification;
+use ipl\Orm\Model;
 use ipl\Web\Common\RedirectOption;
 use ipl\Web\Widget\Icon;
+use Iterator;
 use Traversable;
 
 class DeleteDowntimeForm extends CommandForm
@@ -66,19 +68,14 @@ class DeleteDowntimeForm extends CommandForm
         );
     }
 
-    protected function getCommands(Traversable $objects): Traversable
+    protected function getCommands(Iterator $objects): Traversable
     {
-        $granted = (function () use ($objects): Generator {
-            foreach ($objects as $object) {
-                if (
-                    $this->isGrantedOn('icingadb/command/downtime/delete', $object->{$object->object_type})
-                    && $object->scheduled_by === null
-                ) {
-                    yield $object;
-                }
-            }
-        })();
+        $granted = new CallbackFilterIterator($objects, function (Model $object): bool {
+            return $object->scheduled_by === null
+                && $this->isGrantedOn('icingadb/command/downtime/delete', $object->{$object->object_type});
+        });
 
+        $granted->rewind(); // Forwards the pointer to the first element
         if ($granted->valid()) {
             $command = new DeleteDowntimeCommand();
             $command->setObjects($granted);
diff --git a/application/forms/Command/Object/ProcessCheckResultForm.php b/application/forms/Command/Object/ProcessCheckResultForm.php
index 5764bf8..7c612bf 100644
--- a/application/forms/Command/Object/ProcessCheckResultForm.php
+++ b/application/forms/Command/Object/ProcessCheckResultForm.php
@@ -4,7 +4,7 @@
 
 namespace Icinga\Module\Icingadb\Forms\Command\Object;
 
-use Generator;
+use CallbackFilterIterator;
 use Icinga\Module\Icingadb\Command\Object\ProcessCheckResultCommand;
 use Icinga\Module\Icingadb\Forms\Command\CommandForm;
 use Icinga\Module\Icingadb\Model\Host;
@@ -15,6 +15,7 @@ use ipl\Html\Text;
 use ipl\Orm\Model;
 use ipl\Web\FormDecorator\IcingaFormDecorator;
 use ipl\Web\Widget\Icon;
+use Iterator;
 use Traversable;
 
 use function ipl\Stdlib\iterable_value_first;
@@ -133,16 +134,14 @@ class ProcessCheckResultForm extends CommandForm
         (new IcingaFormDecorator())->decorate($this->getElement('btn_submit'));
     }
 
-    protected function getCommands(Traversable $objects): Traversable
+    protected function getCommands(Iterator $objects): Traversable
     {
-        $granted = (function () use ($objects): Generator {
-            foreach ($this->filterGrantedOn('icingadb/command/process-check-result', $objects) as $object) {
-                if ($object->passive_checks_enabled) {
-                    yield $object;
-                }
-            }
-        })();
+        $granted = new CallbackFilterIterator($objects, function (Model $object): bool {
+            return $object->passive_checks_enabled
+                && $this->isGrantedOn('icingadb/command/process-check-result', $object);
+        });
 
+        $granted->rewind(); // Forwards the pointer to the first element
         if ($granted->valid()) {
             $command = new ProcessCheckResultCommand();
             $command->setObjects($granted);
diff --git a/application/forms/Command/Object/RemoveAcknowledgementForm.php b/application/forms/Command/Object/RemoveAcknowledgementForm.php
index 8697985..d81fe7f 100644
--- a/application/forms/Command/Object/RemoveAcknowledgementForm.php
+++ b/application/forms/Command/Object/RemoveAcknowledgementForm.php
@@ -4,11 +4,14 @@
 
 namespace Icinga\Module\Icingadb\Forms\Command\Object;
 
+use CallbackFilterIterator;
 use Icinga\Module\Icingadb\Command\Object\RemoveAcknowledgementCommand;
 use Icinga\Module\Icingadb\Forms\Command\CommandForm;
 use Icinga\Module\Icingadb\Model\Host;
 use Icinga\Web\Notification;
+use ipl\Orm\Model;
 use ipl\Web\Widget\Icon;
+use Iterator;
 use Traversable;
 
 use function ipl\Stdlib\iterable_value_first;
@@ -62,10 +65,13 @@ class RemoveAcknowledgementForm extends CommandForm
         );
     }
 
-    protected function getCommands(Traversable $objects): Traversable
+    protected function getCommands(Iterator $objects): Traversable
     {
-        $granted = $this->filterGrantedOn('icingadb/command/remove-acknowledgement', $objects);
+        $granted = new CallbackFilterIterator($objects, function (Model $object): bool {
+            return $this->isGrantedOn('icingadb/command/remove-acknowledgement', $object);
+        });
 
+        $granted->rewind(); // Forwards the pointer to the first element
         if ($granted->valid()) {
             $command = new RemoveAcknowledgementCommand();
             $command->setObjects($granted);
diff --git a/application/forms/Command/Object/ScheduleCheckForm.php b/application/forms/Command/Object/ScheduleCheckForm.php
index 9b32ea1..bdeba53 100644
--- a/application/forms/Command/Object/ScheduleCheckForm.php
+++ b/application/forms/Command/Object/ScheduleCheckForm.php
@@ -4,9 +4,9 @@
 
 namespace Icinga\Module\Icingadb\Forms\Command\Object;
 
+use CallbackFilterIterator;
 use DateInterval;
 use DateTime;
-use Generator;
 use Icinga\Module\Icingadb\Command\Object\ScheduleCheckCommand;
 use Icinga\Module\Icingadb\Forms\Command\CommandForm;
 use Icinga\Module\Icingadb\Model\Host;
@@ -14,8 +14,10 @@ use Icinga\Web\Notification;
 use ipl\Html\Attributes;
 use ipl\Html\HtmlElement;
 use ipl\Html\Text;
+use ipl\Orm\Model;
 use ipl\Web\FormDecorator\IcingaFormDecorator;
 use ipl\Web\Widget\Icon;
+use Iterator;
 use Traversable;
 
 use function ipl\Stdlib\iterable_value_first;
@@ -109,22 +111,17 @@ class ScheduleCheckForm extends CommandForm
         (new IcingaFormDecorator())->decorate($this->getElement('btn_submit'));
     }
 
-    protected function getCommands(Traversable $objects): Traversable
+    protected function getCommands(Iterator $objects): Traversable
     {
-        $granted = (function () use ($objects): Generator {
-            foreach ($objects as $object) {
-                if (
-                    $this->isGrantedOn('icingadb/command/schedule-check', $object)
-                    || (
-                        $object->active_checks_enabled
-                        && $this->isGrantedOn('icingadb/command/schedule-check/active-only', $object)
-                    )
-                ) {
-                    yield $object;
-                }
-            }
-        })();
+        $granted = new CallbackFilterIterator($objects, function (Model $object): bool {
+            return $this->isGrantedOn('icingadb/command/schedule-check', $object)
+                || (
+                    $object->active_checks_enabled
+                    && $this->isGrantedOn('icingadb/command/schedule-check/active-only', $object)
+                );
+        });
 
+        $granted->rewind(); // Forwards the pointer to the first element
         if ($granted->valid()) {
             $command = new ScheduleCheckCommand();
             $command->setObjects($granted);
diff --git a/application/forms/Command/Object/ScheduleHostDowntimeForm.php b/application/forms/Command/Object/ScheduleHostDowntimeForm.php
index bc21114..a09b00d 100644
--- a/application/forms/Command/Object/ScheduleHostDowntimeForm.php
+++ b/application/forms/Command/Object/ScheduleHostDowntimeForm.php
@@ -4,13 +4,16 @@
 
 namespace Icinga\Module\Icingadb\Forms\Command\Object;
 
+use CallbackFilterIterator;
 use DateInterval;
 use DateTime;
 use Icinga\Application\Config;
 use Icinga\Module\Icingadb\Command\Object\PropagateHostDowntimeCommand;
 use Icinga\Module\Icingadb\Command\Object\ScheduleHostDowntimeCommand;
 use Icinga\Web\Notification;
+use ipl\Orm\Model;
 use ipl\Web\FormDecorator\IcingaFormDecorator;
+use Iterator;
 use Traversable;
 
 class ScheduleHostDowntimeForm extends ScheduleServiceDowntimeForm
@@ -87,10 +90,13 @@ class ScheduleHostDowntimeForm extends ScheduleServiceDowntimeForm
         $decorator->decorate($this->getElement('child_options'));
     }
 
-    protected function getCommands(Traversable $objects): Traversable
+    protected function getCommands(Iterator $objects): Traversable
     {
-        $granted = $this->filterGrantedOn('icingadb/command/downtime/schedule', $objects);
+        $granted = new CallbackFilterIterator($objects, function (Model $object): bool {
+            return $this->isGrantedOn('icingadb/command/downtime/schedule', $object);
+        });
 
+        $granted->rewind(); // Forwards the pointer to the first element
         if ($granted->valid()) {
             if (($childOptions = (int) $this->getValue('child_options'))) {
                 $command = new PropagateHostDowntimeCommand();
diff --git a/application/forms/Command/Object/ScheduleServiceDowntimeForm.php b/application/forms/Command/Object/ScheduleServiceDowntimeForm.php
index 184a4e8..b237408 100644
--- a/application/forms/Command/Object/ScheduleServiceDowntimeForm.php
+++ b/application/forms/Command/Object/ScheduleServiceDowntimeForm.php
@@ -4,6 +4,7 @@
 
 namespace Icinga\Module\Icingadb\Forms\Command\Object;
 
+use CallbackFilterIterator;
 use DateInterval;
 use DateTime;
 use Icinga\Application\Config;
@@ -13,9 +14,11 @@ use Icinga\Web\Notification;
 use ipl\Html\Attributes;
 use ipl\Html\HtmlElement;
 use ipl\Html\Text;
+use ipl\Orm\Model;
 use ipl\Validator\CallbackValidator;
 use ipl\Web\FormDecorator\IcingaFormDecorator;
 use ipl\Web\Widget\Icon;
+use Iterator;
 use Traversable;
 
 class ScheduleServiceDowntimeForm extends CommandForm
@@ -242,10 +245,13 @@ class ScheduleServiceDowntimeForm extends CommandForm
         (new IcingaFormDecorator())->decorate($this->getElement('btn_submit'));
     }
 
-    protected function getCommands(Traversable $objects): Traversable
+    protected function getCommands(Iterator $objects): Traversable
     {
-        $granted = $this->filterGrantedOn('icingadb/command/downtime/schedule', $objects);
+        $granted = new CallbackFilterIterator($objects, function (Model $object): bool {
+            return $this->isGrantedOn('icingadb/command/downtime/schedule', $object);
+        });
 
+        $granted->rewind(); // Forwards the pointer to the first element
         if ($granted->valid()) {
             $command = new ScheduleServiceDowntimeCommand();
             $command->setObjects($granted);
diff --git a/application/forms/Command/Object/SendCustomNotificationForm.php b/application/forms/Command/Object/SendCustomNotificationForm.php
index dfb1e96..4b0539e 100644
--- a/application/forms/Command/Object/SendCustomNotificationForm.php
+++ b/application/forms/Command/Object/SendCustomNotificationForm.php
@@ -4,6 +4,7 @@
 
 namespace Icinga\Module\Icingadb\Forms\Command\Object;
 
+use CallbackFilterIterator;
 use Icinga\Application\Config;
 use Icinga\Module\Icingadb\Command\Object\SendCustomNotificationCommand;
 use Icinga\Module\Icingadb\Forms\Command\CommandForm;
@@ -12,8 +13,10 @@ use Icinga\Web\Notification;
 use ipl\Html\Attributes;
 use ipl\Html\HtmlElement;
 use ipl\Html\Text;
+use ipl\Orm\Model;
 use ipl\Web\FormDecorator\IcingaFormDecorator;
 use ipl\Web\Widget\Icon;
+use Iterator;
 use Traversable;
 
 use function ipl\Stdlib\iterable_value_first;
@@ -108,10 +111,13 @@ class SendCustomNotificationForm extends CommandForm
         (new IcingaFormDecorator())->decorate($this->getElement('btn_submit'));
     }
 
-    protected function getCommands(Traversable $objects): Traversable
+    protected function getCommands(Iterator $objects): Traversable
     {
-        $granted = $this->filterGrantedOn('icingadb/command/send-custom-notification', $objects);
+        $granted = new CallbackFilterIterator($objects, function (Model $object): bool {
+            return $this->isGrantedOn('icingadb/command/send-custom-notification', $object);
+        });
 
+        $granted->rewind(); // Forwards the pointer to the first element
         if ($granted->valid()) {
             $command = new SendCustomNotificationCommand();
             $command->setObjects($granted);
diff --git a/application/forms/Command/Object/ToggleObjectFeaturesForm.php b/application/forms/Command/Object/ToggleObjectFeaturesForm.php
index 50767da..63530f6 100644
--- a/application/forms/Command/Object/ToggleObjectFeaturesForm.php
+++ b/application/forms/Command/Object/ToggleObjectFeaturesForm.php
@@ -4,12 +4,14 @@
 
 namespace Icinga\Module\Icingadb\Forms\Command\Object;
 
+use CallbackFilterIterator;
 use Icinga\Module\Icingadb\Command\Object\ToggleObjectFeatureCommand;
 use Icinga\Module\Icingadb\Forms\Command\CommandForm;
 use Icinga\Web\Notification;
 use ipl\Html\FormElement\CheckboxElement;
 use ipl\Orm\Model;
 use ipl\Web\FormDecorator\IcingaFormDecorator;
+use Iterator;
 use Traversable;
 
 class ToggleObjectFeaturesForm extends CommandForm
@@ -156,7 +158,7 @@ class ToggleObjectFeaturesForm extends CommandForm
     {
     }
 
-    protected function getCommands(Traversable $objects): Traversable
+    protected function getCommands(Iterator $objects): Traversable
     {
         foreach ($this->features as $feature => $spec) {
             if ($this->getElement($feature) instanceof CheckboxElement) {
@@ -169,8 +171,11 @@ class ToggleObjectFeaturesForm extends CommandForm
                 continue;
             }
 
-            $granted = $this->filterGrantedOn($spec['permission'], $objects);
+            $granted = new CallbackFilterIterator($objects, function (Model $object) use ($spec): bool {
+                return $this->isGrantedOn($spec['permission'], $object);
+            });
 
+            $granted->rewind(); // Forwards the pointer to the first element
             if ($granted->valid()) {
                 $command = new ToggleObjectFeatureCommand();
                 $command->setObjects($granted);