Add delete button to modify view

The modify view for the process form and edit node form must contain delete button. This allows the user to either
store the modifications or delete the nodes.

Author: raviks789

application/forms/EditNodeForm.php

@@ -12,6 +12,7 @@
 use Icinga\Module\Monitoring\Backend\MonitoringBackend;
 use Icinga\Web\Session\SessionNamespace;
 use ipl\Sql\Connection as IcingaDbConnection;
+use ipl\Web\Url;
 
 class EditNodeForm extends QuickForm
 {
@@ -79,6 +80,20 @@ public function setup()
                 $this->setSubmitLabel($this->translate('Next'));
                 return;
         }
+
+        $this->deleteButtonName = 'delete_node';
+
+        $el = $this->createElement(
+            'submit',
+            $this->deleteButtonName,
+            [
+                'label'             => $this->translate('Delete'),
+                'data-base-target'  => '_main',
+                'decorators'        => ['ViewHelper']
+            ]
+        );
+
+        $this->addElement($el);
     }
 
     protected function isService()
@@ -388,6 +403,24 @@ public function getNode()
         return $this->node;
     }
 
+    protected function onRequest()
+    {
+        $params = Url::fromRequest()->getParams();
+        if ($this->shouldBeDeleted()) {
+            $url = Url::fromRequest();
+
+            $url->setParams([
+                'config' => $params->get('config'),
+                'node' => $params->get('node'),
+                'unlocked' => 1,
+                'action' => 'delete',
+                'deletenode' => $params->get('editmonitorednode')
+            ]);
+
+            $this->redirectAndExit($url);
+        }
+    }
+
     public function onSuccess()
     {
         $changes = ProcessChanges::construct($this->bp, $this->session);
@@ -443,4 +476,14 @@ public function isValid($data)
 
         return parent::isValid($data);
     }
+
+    public function shouldBeDeleted()
+    {
+        if ($this->deleteButtonName === null) {
+            return false;
+        }
+
+        $name = $this->deleteButtonName;
+        return $this->getSentValue($name) === $this->getElement($name)->getLabel();
+    }
 }

application/forms/ProcessForm.php

@@ -11,6 +11,7 @@
 use Icinga\Web\Notification;
 use Icinga\Web\Session\SessionNamespace;
 use ipl\Sql\Connection as IcingaDbConnection;
+use ipl\Web\Url;
 
 class ProcessForm extends QuickForm
 {
@@ -92,6 +93,13 @@ public function setup()
                 $this->getElement('url')->setValue($node->getInfoUrl());
             }
         }
+
+        $label = $this->translate('Delete');
+        $el = $this->createElement('submit', $label, array(
+            'data-base-target' => '_main'
+        ))->setLabel($label)->setDecorators(array('ViewHelper'));
+        $this->deleteButtonName = $el->getName();
+        $this->addElement($el);
     }
 
     /**
@@ -135,6 +143,32 @@ public function setSession(SessionNamespace $session)
         return $this;
     }
 
+    protected function onRequest()
+    {
+        $params = Url::fromRequest()->getParams();
+        if ($this->shouldBeDeleted()) {
+            $url = Url::fromRequest();
+
+            $url->setParams([
+                'config' => $params->get('config'),
+                'unlocked' => 1,
+                'action' => 'delete',
+                'deletenode' => $params->get('editnode')
+            ]);
+
+            $this->redirectAndExit($url);
+        }
+    }
+
+    protected function getNode(BpConfig $bp, $nodeName)
+    {
+        if ($nodeName) {
+            return $bp->getNode($nodeName);
+        } else {
+            return null;
+        }
+    }
+
     public function onSuccess()
     {
         $changes = ProcessChanges::construct($this->bp, $this->session);
@@ -195,4 +229,19 @@ public function onSuccess()
 
         parent::onSuccess();
     }
+
+    public function hasDeleteButton()
+    {
+        return $this->deleteButtonName !== null;
+    }
+
+    public function shouldBeDeleted()
+    {
+        if (! $this->hasDeleteButton()) {
+            return false;
+        }
+
+        $name = $this->deleteButtonName;
+        return $this->getSentValue($name) === $this->getElement($name)->getLabel();
+    }
 }