Allow to disable stack traces globally

refs #9113

application/forms/Config/General/ApplicationConfigForm.php

@@ -25,6 +25,20 @@ class ApplicationConfigForm extends Form
      */
     public function createElements(array $formData)
     {
+        $this->addElement(
+            'checkbox',
+            'global_show_stacktraces',
+            array(
+                'required'      => true,
+                'value'         => true,
+                'label'         => $this->translate('Show Stacktraces'),
+                'description'   => $this->translate(
+                    'Set whether to show an exception\'s stacktrace by default. This can also'
+                    . ' be set in a user\'s preferences with the appropriate permission.'
+                )
+            )
+        );
+
         $this->addElement(
             'text',
             'global_module_path',

library/Icinga/Application/Web.php

@@ -212,9 +212,12 @@ class Web extends EmbeddedWeb
         $this->frontController = Zend_Controller_Front::getInstance();
         $this->frontController->setRequest($this->getRequest());
         $this->frontController->setControllerDirectory($this->getApplicationDir('/controllers'));
+
+        $displayExceptions = $this->config->get('global', 'show_stacktraces', true);
+
         $this->frontController->setParams(
             array(
-                'displayExceptions' => true
+                'displayExceptions' => $displayExceptions
             )
         );
         return $this;

modules/setup/library/Setup/Steps/GeneralConfigStep.php

@@ -53,6 +53,10 @@ class GeneralConfigStep extends Step
 
         $generalHtml = ''
             . '<ul>'
+            . '<li>' . ($this->data['generalConfig']['global_show_stacktraces']
+                ? t('An exception\'s stacktrace is shown to every user by default.')
+                : t('An exception\'s stacktrace is hidden from every user by default.')
+            ) . '</li>'
             . '<li>' . sprintf(
                 $this->data['generalConfig']['global_config_backend'] === 'ini' ? sprintf(
                     t('Preferences will be stored per user account in INI files at: %s'),