Add config to hide/show pplication state messages

refs #2835

application/forms/Config/General/ApplicationConfigForm.php

@@ -43,6 +43,20 @@ class ApplicationConfigForm extends Form
             )
         );
 
+        $this->addElement(
+            'checkbox',
+            'global_show_application_state_messages',
+            array(
+                'required'      => true,
+                'value'         => true,
+                'label'         => $this->translate('Show Application State Messages'),
+                'description'   => $this->translate(
+                    "Set whether to show application state messages."
+                    . " This can also be set in a user's preferences."
+                )
+            )
+        );
+
         $this->addElement(
             'text',
             'global_module_path',

application/forms/PreferenceForm.php

@@ -233,6 +233,23 @@ class PreferenceForm extends Form
             )
         );
 
+        $this->addElement(
+            'select',
+            'show_application_state_messages',
+            array(
+                'required'      => true,
+                'label'         => $this->translate('Show application state messages'),
+                'description'   => $this->translate('Whether to show application state messages.'),
+                'multiOptions'  => [
+                    'system' => (bool) Config::app()->get('global', 'show_application_state_messages', true)
+                        ? $this->translate('System (Yes)')
+                        : $this->translate('System (No)'),
+                    1        => $this->translate('Yes'),
+                    0        => $this->translate('No')],
+                'value'         => 'system'
+            )
+        );
+
         if (Auth::getInstance()->hasPermission('application/stacktraces')) {
             $this->addElement(
                 'checkbox',

library/Icinga/Web/Widget/ApplicationStateMessages.php

@@ -3,7 +3,9 @@
 
 namespace Icinga\Web\Widget;
 
+use Icinga\Application\Config;
 use Icinga\Application\Hook\ApplicationStateHook;
+use Icinga\Authentication\Auth;
 use Icinga\Forms\AcknowledgeApplicationStateMessageForm;
 use Icinga\Web\ApplicationStateCookie;
 use Icinga\Web\Helper\HtmlPurifier;
@@ -33,6 +35,19 @@ class ApplicationStateMessages extends AbstractWidget
 
     public function render()
     {
+        $enabled = Auth::getInstance()
+            ->getUser()
+            ->getPreferences()
+            ->getValue('icingaweb', 'show_application_state_messages', 'system');
+
+        if ($enabled === 'system') {
+            $enabled = Config::app()->get('global', 'show_application_state_messages', true);
+        }
+
+        if (! (bool) $enabled) {
+            return '<div style="display: none;"></div>';
+        }
+
         $active = $this->getMessages();
 
         if (empty($active)) {