UserGroupBackendForm: add button "Validate Configuration"

refs #3233

application/forms/Config/UserGroup/UserGroupBackendForm.php

@@ -3,6 +3,11 @@
 
 namespace Icinga\Forms\Config\UserGroup;
 
+use Icinga\Authentication\UserGroup\UserGroupBackend;
+use Icinga\Data\ConfigObject;
+use Icinga\Data\Inspectable;
+use Icinga\Data\Inspection;
+use Icinga\Web\Form;
 use InvalidArgumentException;
 use Icinga\Exception\IcingaException;
 use Icinga\Exception\NotFoundError;
@@ -13,6 +18,8 @@ use Icinga\Forms\ConfigForm;
  */
 class UserGroupBackendForm extends ConfigForm
 {
+    protected $validatePartial = true;
+
     /**
      * The backend to load when displaying the form for the first time
      *
@@ -20,6 +27,23 @@ class UserGroupBackendForm extends ConfigForm
      */
     protected $backendToLoad;
 
+    /**
+     * Create a user group backend by using the given form's values and return its inspection results
+     *
+     * Returns null for non-inspectable backends.
+     *
+     * @param   Form    $form
+     *
+     * @return  Inspection|null
+     */
+    public static function inspectUserBackend(Form $form)
+    {
+        $backend = UserGroupBackend::create(null, new ConfigObject($form->getValues()));
+        if ($backend instanceof Inspectable) {
+            return $backend->inspect();
+        }
+    }
+
     /**
      * Initialize this form
      */
@@ -190,4 +214,87 @@ class UserGroupBackendForm extends ConfigForm
             $this->populate($data);
         }
     }
+
+    /**
+     * Run the configured backend's inspection checks and show the result, if necessary
+     *
+     * This will only run any validation if the user pushed the 'backend_validation' button.
+     *
+     * @param   array   $formData
+     *
+     * @return  bool
+     */
+    public function isValidPartial(array $formData)
+    {
+        if (isset($formData['backend_validation']) && parent::isValid($formData)) {
+            $inspection = static::inspectUserBackend($this);
+            if ($inspection !== null) {
+                $join = function ($e) use (& $join) {
+                    return is_string($e) ? $e : join("\n", array_map($join, $e));
+                };
+                $this->addElement(
+                    'note',
+                    'inspection_output',
+                    array(
+                        'order'         => 0,
+                        'value'         => '<strong>' . $this->translate('Validation Log') . "</strong>\n\n"
+                            . join("\n", array_map($join, $inspection->toArray())),
+                        'decorators'    => array(
+                            'ViewHelper',
+                            array('HtmlTag', array('tag' => 'pre', 'class' => 'log-output')),
+                        )
+                    )
+                );
+
+                if ($inspection->hasError()) {
+                    $this->warning(sprintf(
+                        $this->translate('Failed to successfully validate the configuration: %s'),
+                        $inspection->getError()
+                    ));
+                    return false;
+                }
+            }
+
+            $this->info($this->translate('The configuration has been successfully validated.'));
+        }
+
+        return true;
+    }
+
+    /**
+     * Add a submit button to this form and one to manually validate the configuration
+     *
+     * Calls parent::addSubmitButton() to add the submit button.
+     *
+     * @return  $this
+     */
+    public function addSubmitButton()
+    {
+        parent::addSubmitButton()
+            ->getElement('btn_submit')
+            ->setDecorators(array('ViewHelper'));
+
+        $this->addElement(
+            'submit',
+            'backend_validation',
+            array(
+                'ignore'                => true,
+                'label'                 => $this->translate('Validate Configuration'),
+                'data-progress-label'   => $this->translate('Validation In Progress'),
+                'decorators'            => array('ViewHelper')
+            )
+        );
+        $this->addDisplayGroup(
+            array('btn_submit', 'backend_validation'),
+            'submit_validation',
+            array(
+                'decorators' => array(
+                    'FormElements',
+                    array('HtmlTag', array('tag' => 'div', 'class' => 'control-group form-controls'))
+                )
+            )
+        );
+
+        return $this;
+    }
 }