PropertyModifierGetHostByName: new modifier

library/Director/PropertyModifier/PropertyModifierGetHostByName.php

@@ -0,0 +1,50 @@
+<?php
+
+namespace Icinga\Module\Director\PropertyModifier;
+
+use Icinga\Exception\InvalidPropertyException;
+use Icinga\Module\Director\Hook\PropertyModifierHook;
+use Icinga\Module\Director\Web\Form\QuickForm;
+
+class PropertyModifierGetHostByName extends PropertyModifierHook
+{
+    public static function addSettingsFormFields(QuickForm $form)
+    {
+        $form->addElement('select', 'on_failure', array(
+            'label'        => 'On failure',
+            'description'  => $form->translate('What should we do if the host (DNS) lookup fails?'),
+            'multiOptions' => $form->optionalEnum(array(
+                'null' => $form->translate('Set no value (null)'),
+                'keep' => $form->translate('Keep the property (hostname) as is'),
+                'fail' => $form->translate('Let the whole import run fail'),
+            )),
+            'required'    => true,
+        ));
+    }
+
+    public function getName()
+    {
+        return 'Get host by name (DNS lookup)';
+    }
+
+    public function transform($value)
+    {
+        $host = gethostbyname($value);
+        if (strlen(@inet_pton($host)) !== 4) {
+            switch($this->getSetting('on_failure')) {
+                case 'null':
+                    return null;
+                case 'keep':
+                    return $value;
+                case 'fail':
+                default:
+                    throw new InvalidPropertyException(
+                        'Host lookup failed for "%s"',
+                        $value
+                    );
+            }
+        }
+
+        return $host;
+    }
+}

run.php

@@ -22,3 +22,4 @@ $this->provideHook('director/PropertyModifier', $prefix . 'PropertyModifier\\Pro
 $this->provideHook('director/PropertyModifier', $prefix . 'PropertyModifier\\PropertyModifierStripDomain');
 $this->provideHook('director/PropertyModifier', $prefix . 'PropertyModifier\\PropertyModifierSubstring');
 $this->provideHook('director/PropertyModifier', $prefix . 'PropertyModifier\\PropertyModifierUppercase');
+$this->provideHook('director/PropertyModifier', $prefix . 'PropertyModifier\\PropertyModifierGetHostByName');