From 39c7451664f950e6a5a25f72d1ace0f8dcc060d6 Mon Sep 17 00:00:00 2001
From: Eric Lippmann <eric.lippmann@icinga.com>
Date: Tue, 29 Nov 2016 15:12:33 +0100
Subject: [PATCH] Implement announcements

refs #11198
---
 .../controllers/AnnouncementsController.php   | 100 +++++++++++
 .../ApplicationStateController.php            |  22 ++-
 application/controllers/LayoutController.php  |   5 +
 .../AcknowledgeAnnouncementForm.php           |  79 +++++++++
 .../forms/Announcement/AnnouncementForm.php   | 117 +++++++++++++
 application/forms/Security/RoleForm.php       |   3 +
 application/layouts/scripts/body.phtml        |   3 +
 .../views/scripts/announcements/index.phtml   |  61 +++++++
 .../views/scripts/layout/announcements.phtml  |   1 +
 library/Icinga/Application/Web.php            |   9 +-
 library/Icinga/Web/Announcement.php           | 158 +++++++++++++++++
 .../Web/Announcement/AnnouncementCookie.php   | 137 +++++++++++++++
 .../AnnouncementIniRepository.php             | 159 ++++++++++++++++++
 library/Icinga/Web/Widget/Announcements.php   |  54 ++++++
 public/css/icinga/forms.less                  |   5 +-
 public/css/icinga/widgets.less                |  45 +++++
 public/js/icinga/loader.js                    |   4 +
 17 files changed, 957 insertions(+), 5 deletions(-)
 create mode 100644 application/controllers/AnnouncementsController.php
 create mode 100644 application/forms/Announcement/AcknowledgeAnnouncementForm.php
 create mode 100644 application/forms/Announcement/AnnouncementForm.php
 create mode 100644 application/views/scripts/announcements/index.phtml
 create mode 100644 application/views/scripts/layout/announcements.phtml
 create mode 100644 library/Icinga/Web/Announcement.php
 create mode 100644 library/Icinga/Web/Announcement/AnnouncementCookie.php
 create mode 100644 library/Icinga/Web/Announcement/AnnouncementIniRepository.php
 create mode 100644 library/Icinga/Web/Widget/Announcements.php

diff --git a/application/controllers/AnnouncementsController.php b/application/controllers/AnnouncementsController.php
new file mode 100644
index 000000000..458b9a40a
--- /dev/null
+++ b/application/controllers/AnnouncementsController.php
@@ -0,0 +1,100 @@
+<?php
+/* Icinga Web 2 | (c) 2016 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Controllers;
+
+use Icinga\Exception\NotFoundError;
+use Icinga\Forms\Announcement\AcknowledgeAnnouncementForm;
+use Icinga\Forms\Announcement\AnnouncementForm;
+use Icinga\Web\Announcement\AnnouncementIniRepository;
+use Icinga\Web\Controller;
+use Icinga\Web\Url;
+
+class AnnouncementsController extends Controller
+{
+    /**
+     * List all announcements
+     */
+    public function indexAction()
+    {
+        $this->getTabs()->add(
+            'announcements',
+            array(
+                'active'    => true,
+                'label'     => $this->translate('Announcements'),
+                'title'     => $this->translate('List All Announcements'),
+                'url'       => Url::fromPath('announcements')
+            )
+        );
+
+        $repo = new AnnouncementIniRepository();
+        $this->view->announcements = $repo
+            ->select(array('id', 'author', 'message', 'start', 'end'))
+            ->order('start');
+    }
+
+    /**
+     * Create an announcement
+     */
+    public function newAction()
+    {
+        $this->assertPermission('admin');
+
+        $form = $this->prepareForm()->add();
+        $form->handleRequest();
+        $this->renderForm($form, $this->translate('New Announcement'));
+    }
+
+    /**
+     * Update an announcement
+     */
+    public function updateAction()
+    {
+        $this->assertPermission('admin');
+
+        $form = $this->prepareForm()->edit($this->params->getRequired('id'));
+        try {
+            $form->handleRequest();
+        } catch (NotFoundError $_) {
+            $this->httpNotFound($this->translate('Announcement not found'));
+        }
+        $this->renderForm($form, $this->translate('Update Announcement'));
+    }
+
+    /**
+     * Remove an announcement
+     */
+    public function removeAction()
+    {
+        $this->assertPermission('admin');
+
+        $form = $this->prepareForm()->remove($this->params->getRequired('id'));
+        try {
+            $form->handleRequest();
+        } catch (NotFoundError $_) {
+            $this->httpNotFound($this->translate('Announcement not found'));
+        }
+        $this->renderForm($form, $this->translate('Remove Announcement'));
+    }
+
+    public function acknowledgeAction()
+    {
+        $this->assertHttpMethod('POST');
+        $this->getResponse()->setHeader('X-Icinga-Container', 'ignore', true);
+        $form = new AcknowledgeAnnouncementForm();
+        $form->handleRequest();
+    }
+
+    /**
+     * Assert permission admin and return a prepared RepositoryForm
+     *
+     * @return AnnouncementForm
+     */
+    protected function prepareForm()
+    {
+        $form = new AnnouncementForm();
+        return $form
+            ->setRepository(new AnnouncementIniRepository())
+            ->setRedirectUrl(Url::fromPath('announcements'));
+    }
+}
diff --git a/application/controllers/ApplicationStateController.php b/application/controllers/ApplicationStateController.php
index caae26f54..cba019843 100644
--- a/application/controllers/ApplicationStateController.php
+++ b/application/controllers/ApplicationStateController.php
@@ -4,6 +4,8 @@
 namespace Icinga\Controllers;
 
 use Icinga\Application\Icinga;
+use Icinga\Web\Announcement\AnnouncementCookie;
+use Icinga\Web\Announcement\AnnouncementIniRepository;
 use Icinga\Web\Controller;
 use Icinga\Web\Session;
 
@@ -14,6 +16,7 @@ class ApplicationStateController extends Controller
 {
     public function indexAction()
     {
+        $this->_helper->layout()->disableLayout();
         if (isset($_COOKIE['icingaweb2-session'])) {
             $last = (int) $_COOKIE['icingaweb2-session'];
         } else {
@@ -34,6 +37,23 @@ class ApplicationStateController extends Controller
             );
             $_COOKIE['icingaweb2-session'] = $now;
         }
-        Icinga::app()->getResponse()->setHeader('X-Icinga-Container', 'ignore', true);
+        $announcementCookie = new AnnouncementCookie();
+        $announcementRepo = new AnnouncementIniRepository();
+        if ($announcementCookie->getEtag() !== $announcementRepo->getEtag()) {
+            $announcementCookie
+                ->setEtag($announcementRepo->getEtag())
+                ->setNextActive($announcementRepo->findNextActive());
+            $this->getResponse()->setCookie($announcementCookie);
+            $this->getResponse()->setHeader('X-Icinga-Announcements', 'refresh', true);
+        } else {
+            $nextActive = $announcementCookie->getNextActive();
+            if ($nextActive && $nextActive <= $now) {
+                $announcementCookie->setNextActive($announcementRepo->findNextActive());
+                $this->getResponse()->setCookie($announcementCookie);
+                $this->getResponse()->setHeader('X-Icinga-Announcements', 'refresh', true);
+            }
+        }
+
+        $this->getResponse()->setHeader('X-Icinga-Container', 'ignore', true);
     }
 }
diff --git a/application/controllers/LayoutController.php b/application/controllers/LayoutController.php
index f7bbd5102..32295a688 100644
--- a/application/controllers/LayoutController.php
+++ b/application/controllers/LayoutController.php
@@ -20,4 +20,9 @@ class LayoutController extends ActionController
         $this->_helper->layout()->disableLayout();
         $this->view->menuRenderer = Icinga::app()->getMenu()->getRenderer();
     }
+
+    public function announcementsAction()
+    {
+        $this->_helper->layout()->disableLayout();
+    }
 }
diff --git a/application/forms/Announcement/AcknowledgeAnnouncementForm.php b/application/forms/Announcement/AcknowledgeAnnouncementForm.php
new file mode 100644
index 000000000..f4b86fe73
--- /dev/null
+++ b/application/forms/Announcement/AcknowledgeAnnouncementForm.php
@@ -0,0 +1,79 @@
+<?php
+/* Icinga Web 2 | (c) 2016 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Forms\Announcement;
+
+use Icinga\Web\Announcement\AnnouncementCookie;
+use Icinga\Web\Form;
+
+class AcknowledgeAnnouncementForm extends Form
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function init()
+    {
+        $this->setAction('announcements/acknowledge');
+        $this->setAttrib('class', 'form-inline acknowledge-announcement-control');
+        $this->setRedirectUrl('layout/announcements');
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function addSubmitButton()
+    {
+        $this->addElement(
+            'button',
+            'btn_submit',
+            array(
+                'class'         => 'link-button spinner',
+                'decorators'    => array(
+                    'ViewHelper',
+                    array('HtmlTag', array('tag' => 'div', 'class' => 'control-group form-controls'))
+                ),
+                'escape'        => false,
+                'ignore'        => true,
+                'label'         => $this->getView()->icon('cancel'),
+                'title'         => $this->translate('Acknowledge this announcement'),
+                'type'          => 'submit'
+            )
+        );
+        return $this;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function createElements(array $formData = array())
+    {
+        $this->addElements(
+            array(
+                array(
+                    'hidden',
+                    'hash',
+                    array(
+                        'required' => true,
+                        'validators' => array('NotEmpty'),
+                        'decorators' => array('ViewHelper')
+                    )
+                )
+            )
+        );
+
+        return $this;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function onSuccess()
+    {
+        $cookie = new AnnouncementCookie();
+        $acknowledged = $cookie->getAcknowledged();
+        $acknowledged[] = $this->getElement('hash')->getValue();
+        $cookie->setAcknowledged($acknowledged);
+        $this->getResponse()->setCookie($cookie);
+        return true;
+    }
+}
diff --git a/application/forms/Announcement/AnnouncementForm.php b/application/forms/Announcement/AnnouncementForm.php
new file mode 100644
index 000000000..2c712337c
--- /dev/null
+++ b/application/forms/Announcement/AnnouncementForm.php
@@ -0,0 +1,117 @@
+<?php
+/* Icinga Web 2 | (c) 2016 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Forms\Announcement;
+
+use Icinga\Authentication\Auth;
+use Icinga\Data\Filter\Filter;
+use Icinga\Forms\RepositoryForm;
+
+/**
+ * Create, update and delete announcements
+ */
+class AnnouncementForm extends RepositoryForm
+{
+    /**
+     * {@inheritDoc}
+     */
+    protected function createInsertElements(array $formData)
+    {
+        $this->addElement(
+            'text',
+            'author',
+            array(
+                'required'  => true,
+                'value'     => Auth::getInstance()->getUser()->getUsername(),
+                'disabled'  => true
+            )
+        );
+        $this->addElement(
+            'textarea',
+            'message',
+            array(
+                'required'      => true,
+                'label'         => $this->translate('Message'),
+                'description'   => $this->translate('The message to display to users')
+            )
+        );
+        $this->addElement(
+            'dateTimePicker',
+            'start',
+            array(
+                'required'      => true,
+                'label'         => $this->translate('Start'),
+                'description'   => $this->translate('The time to display the announcement from')
+            )
+        );
+        $this->addElement(
+            'dateTimePicker',
+            'end',
+            array(
+                'required'      => true,
+                'label'         => $this->translate('End'),
+                'description'   => $this->translate('The time to display the announcement until')
+            )
+        );
+
+        $this->setTitle($this->translate('Create a new announcement'));
+        $this->setSubmitLabel($this->translate('Create'));
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    protected function createUpdateElements(array $formData)
+    {
+        $this->createInsertElements($formData);
+        $this->setTitle(sprintf($this->translate('Edit announcement %s'), $this->getIdentifier()));
+        $this->setSubmitLabel($this->translate('Save'));
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    protected function createDeleteElements(array $formData)
+    {
+        $this->setTitle(sprintf($this->translate('Remove announcement %s?'), $this->getIdentifier()));
+        $this->setSubmitLabel($this->translate('Yes'));
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    protected function createFilter()
+    {
+        return Filter::where('id', $this->getIdentifier());
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    protected function getInsertMessage($success)
+    {
+        return $success
+            ? $this->translate('Announcement created')
+            : $this->translate('Failed to create announcement');
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    protected function getUpdateMessage($success)
+    {
+        return $success
+            ? $this->translate('Announcement updated')
+            : $this->translate('Failed to update announcement');
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    protected function getDeleteMessage($success)
+    {
+        return $success
+            ? $this->translate('Announcement removed')
+            : $this->translate('Failed to remove announcement');
+    }
+}
diff --git a/application/forms/Security/RoleForm.php b/application/forms/Security/RoleForm.php
index 1873123c2..28330130f 100644
--- a/application/forms/Security/RoleForm.php
+++ b/application/forms/Security/RoleForm.php
@@ -44,6 +44,9 @@ class RoleForm extends ConfigForm
             ) . ' (application/stacktraces)',
             'application/log'                               => $this->translate('Allow to view the application log')
                 . ' (application/log)',
+            'admin'                                         => $this->translate(
+                'Grant admin permissions, e.g. manage announcements'
+            ) . ' (admin)',
             'config/*'                                      => $this->translate('Allow config access') . ' (config/*)'
         );
 
diff --git a/application/layouts/scripts/body.phtml b/application/layouts/scripts/body.phtml
index 0423fc453..792fa69d9 100644
--- a/application/layouts/scripts/body.phtml
+++ b/application/layouts/scripts/body.phtml
@@ -18,6 +18,9 @@ if ($this->layout()->autorefreshInterval) {
 
 ?>
 <div id="header">
+  <div id="announcements" class="container">
+    <?= $this->widget('announcements') ?>
+  </div>
   <div id="header-logo-container">
     <?= $this->qlink(
       '',
diff --git a/application/views/scripts/announcements/index.phtml b/application/views/scripts/announcements/index.phtml
new file mode 100644
index 000000000..2c368a3a1
--- /dev/null
+++ b/application/views/scripts/announcements/index.phtml
@@ -0,0 +1,61 @@
+<?php if (! $compact): ?>
+<div class="controls">
+    <?= $tabs ?>
+</div>
+<?php endif ?>
+<div class="content">
+<?php if ($this->hasPermission('admin')) {
+    echo $this->qlink(
+        $this->translate('Create a New Announcement') ,
+        'announcements/new',
+        null,
+        array(
+            'class'             => 'button-link',
+            'data-base-target'  => '_next',
+            'icon'              => 'plus',
+            'title'             => $this->translate('Create a new announcement')
+        )
+    );
+} ?>
+<?php if (! $announcements->hasResult()): ?>
+    <p><?= $this->translate('No announcements found.') ?></p>
+</div>
+<?php return; endif ?>
+    <table data-base-target="_next" class="table-row-selectable common-table">
+    <thead>
+        <tr>
+            <th><?= $this->translate('Author') ?></th>
+            <th><?= $this->translate('Message') ?></th>
+            <th><?= $this->translate('Start') ?></th>
+            <th><?= $this->translate('End') ?></th>
+            <th></th>
+        </tr>
+    </thead>
+    <tbody>
+    <?php foreach ($announcements as $announcement): /** @var object $announcement */ ?>
+    <?php if ($this->hasPermission('admin')): ?>
+        <tr href="<?= $this->href('announcements/update', array('id' => $announcement->id)) ?>">
+    <?php else: ?>
+        <tr>
+    <?php endif ?>
+            <td><?= $this->escape($announcement->author) ?></td>
+            <td><?= $this->ellipsis($announcement->message, 100) ?></td>
+            <td><?= $this->formatDateTime($announcement->start->getTimestamp()) ?></td>
+            <td><?= $this->formatDateTime($announcement->end->getTimestamp()) ?></td>
+        <?php if ($this->hasPermission('admin')): ?>
+            <td class="icon-col"><?= $this->qlink(
+                null,
+                'announcements/remove',
+                array('id' => $announcement->id),
+                array(
+                    'class' => 'action-link',
+                    'icon'  => 'cancel',
+                    'title' => $this->translate('Remove this announcement')
+                )
+            ) ?></td>
+        <?php endif ?>
+        </tr>
+    <?php endforeach ?>
+    </tbody>
+    </table>
+</div>
diff --git a/application/views/scripts/layout/announcements.phtml b/application/views/scripts/layout/announcements.phtml
new file mode 100644
index 000000000..3be6b834a
--- /dev/null
+++ b/application/views/scripts/layout/announcements.phtml
@@ -0,0 +1 @@
+<?= $this->widget('announcements') ?>
diff --git a/library/Icinga/Application/Web.php b/library/Icinga/Application/Web.php
index 1d8097af1..ad1ce30c3 100644
--- a/library/Icinga/Application/Web.php
+++ b/library/Icinga/Application/Web.php
@@ -304,7 +304,12 @@ class Web extends EmbeddedWeb
                         'about' => array(
                             'label'     => t('About'),
                             'url'       => 'about',
-                            'priority'  => 701
+                            'priority'  => 700
+                        ),
+                        'announcements' => array(
+                            'label'      => t('Announcements'),
+                            'url'        => 'announcements',
+                            'priority'   => 710
                         )
                     )
                 ),
@@ -366,7 +371,7 @@ class Web extends EmbeddedWeb
                     'label'      => t('Application Log'),
                     'url'        => 'list/applicationlog',
                     'permission' => 'application/log',
-                    'priority'   => 710
+                    'priority'   => 900
                 );
             }
         } else {
diff --git a/library/Icinga/Web/Announcement.php b/library/Icinga/Web/Announcement.php
new file mode 100644
index 000000000..9835ce0ca
--- /dev/null
+++ b/library/Icinga/Web/Announcement.php
@@ -0,0 +1,158 @@
+<?php
+/* Icinga Web 2 | (c) 2016 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web;
+
+/**
+ * An announcement to be displayed prominently in the web UI
+ */
+class Announcement
+{
+    /**
+     * @var string
+     */
+    protected $author;
+
+    /**
+     * @var string
+     */
+    protected $message;
+
+    /**
+     * @var int
+     */
+    protected $start;
+
+    /**
+     * @var int
+     */
+    protected $end;
+
+    /**
+     * Hash of the message
+     *
+     * @var string|null
+     */
+    protected $hash = null;
+
+    /**
+     * Announcement constructor
+     *
+     * @param array $properties
+     */
+    public function __construct(array $properties = array())
+    {
+        foreach ($properties as $key => $value) {
+            $method = 'set' . ucfirst($key);
+            if (method_exists($this, $method)) {
+                $this->$method($value);
+            }
+        }
+    }
+
+    /**
+     * Get the author of the acknowledged
+     *
+     * @return string
+     */
+    public function getAuthor()
+    {
+        return $this->author;
+    }
+
+    /**
+     * Set the author of the acknowledged
+     *
+     * @param   string $author
+     *
+     * @return  $this
+     */
+    public function setAuthor($author)
+    {
+        $this->author = $author;
+        return $this;
+    }
+
+    /**
+     * Get the message of the acknowledged
+     *
+     * @return string
+     */
+    public function getMessage()
+    {
+        return $this->message;
+    }
+
+    /**
+     * Set the message of the acknowledged
+     *
+     * @param   string $message
+     *
+     * @return  $this
+     */
+    public function setMessage($message)
+    {
+        $this->message = $message;
+        $this->hash = null;
+        return $this;
+    }
+
+    /**
+     * Get the start date and time of the acknowledged
+     *
+     * @return int
+     */
+    public function getStart()
+    {
+        return $this->start;
+    }
+
+    /**
+     * Set the start date and time of the acknowledged
+     *
+     * @param   int $start
+     *
+     * @return  $this
+     */
+    public function setStart($start)
+    {
+        $this->start = $start;
+        return $this;
+    }
+
+    /**
+     * Get the end date and time of the acknowledged
+     *
+     * @return int
+     */
+    public function getEnd()
+    {
+        return $this->end;
+    }
+
+    /**
+     * Set the end date and time of the acknowledged
+     *
+     * @param   int $end
+     *
+     * @return  $this
+     */
+    public function setEnd($end)
+    {
+        $this->end = $end;
+        return $this;
+    }
+
+    /**
+     * Get the hash of the acknowledgement
+     *
+     * @return string
+     */
+    public function getHash()
+    {
+        if ($this->hash === null) {
+            $this->hash = md5($this->message);
+        }
+        return $this->hash;
+    }
+}
diff --git a/library/Icinga/Web/Announcement/AnnouncementCookie.php b/library/Icinga/Web/Announcement/AnnouncementCookie.php
new file mode 100644
index 000000000..e1f4d479d
--- /dev/null
+++ b/library/Icinga/Web/Announcement/AnnouncementCookie.php
@@ -0,0 +1,137 @@
+<?php
+/* Icinga Web 2 | (c) 2016 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Announcement;
+
+use Icinga\Web\Cookie;
+
+/**
+ * Handle acknowledged announcements via cookie
+ */
+class AnnouncementCookie extends Cookie
+{
+    /**
+     * Array of hashes representing acknowledged announcements
+     *
+     * @var string[]
+     */
+    protected $acknowledged = array();
+
+    /**
+     * ETag of the last known announcements.ini
+     *
+     * @var string
+     */
+    protected $etag;
+
+    /**
+     * Timestamp of the next active acknowledgement, if any
+     *
+     * @var int|null
+     */
+    protected $nextActive;
+
+    /**
+     * AnnouncementCookie constructor
+     */
+    public function __construct()
+    {
+        parent::__construct('icingaweb2-announcements');
+        $this->setExpire(2147483648);
+        if (isset($_COOKIE['icingaweb2-announcements'])) {
+            $cookie = json_decode($_COOKIE['icingaweb2-announcements'], true);
+            if ($cookie !== null) {
+                if (isset($cookie['acknowledged'])) {
+                    $this->setAcknowledged($cookie['acknowledged']);
+                }
+                if (isset($cookie['etag'])) {
+                    $this->setEtag($cookie['etag']);
+                }
+                if (isset($cookie['next'])) {
+                    $this->setNextActive($cookie['next']);
+                }
+            }
+        }
+    }
+
+    /**
+     * Get the hashes of the acknowledged announcements
+     *
+     * @return  string[]
+     */
+    public function getAcknowledged()
+    {
+        return $this->acknowledged;
+    }
+
+    /**
+     * Set the hashes of the acknowledged announcements
+     *
+     * @param   string[] $acknowledged
+     *
+     * @return  $this
+     */
+    public function setAcknowledged(array $acknowledged)
+    {
+        $this->acknowledged = $acknowledged;
+        return $this;
+    }
+
+    /**
+     * Get the ETag
+     *
+     * @return  string
+     */
+    public function getEtag()
+    {
+        return $this->etag;
+    }
+
+    /**
+     * Set the ETag
+     *
+     * @param   string $etag
+     *
+     * @return  $this
+     */
+    public function setEtag($etag)
+    {
+        $this->etag = $etag;
+        return $this;
+    }
+
+    /**
+     * Get the timestamp of the next active announcement
+     *
+     * @return  int
+     */
+    public function getNextActive()
+    {
+        return $this->nextActive;
+    }
+
+    /**
+     * Set the timestamp of the next active announcement
+     *
+     * @param   int $nextActive
+     *
+     * @return  $this
+     */
+    public function setNextActive($nextActive)
+    {
+        $this->nextActive = $nextActive;
+        return $this;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getValue()
+    {
+        return json_encode(array(
+            'acknowledged'  => $this->getAcknowledged(),
+            'etag'          => $this->getEtag(),
+            'next'          => $this->getNextActive()
+        ));
+    }
+}
diff --git a/library/Icinga/Web/Announcement/AnnouncementIniRepository.php b/library/Icinga/Web/Announcement/AnnouncementIniRepository.php
new file mode 100644
index 000000000..86ac88571
--- /dev/null
+++ b/library/Icinga/Web/Announcement/AnnouncementIniRepository.php
@@ -0,0 +1,159 @@
+<?php
+/* Icinga Web 2 | (c) 2016 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Announcement;
+
+use DateTime;
+use Icinga\Data\ConfigObject;
+use Icinga\Data\Filter\Filter;
+use Icinga\Data\Filter\FilterAnd;
+use Icinga\Data\SimpleQuery;
+use Icinga\Repository\IniRepository;
+use Icinga\Web\Announcement;
+
+/**
+ * A collection of announcements stored in an INI file
+ */
+class AnnouncementIniRepository extends IniRepository
+{
+    /**
+     * {@inheritdoc}
+     */
+    protected $queryColumns = array('announcement' => array('id', 'author', 'message', 'hash', 'start', 'end'));
+
+    /**
+     * {@inheritdoc}
+     */
+    protected $triggers = array('announcement');
+
+    /**
+     * {@inheritDoc}
+     */
+    protected $configs = array('announcement' => array(
+        'name'      => 'announcements',
+        'keyColumn' => 'id'
+    ));
+
+    /**
+     * {@inheritDoc}
+     */
+    protected $conversionRules = array('announcement' => array(
+        'start' => 'timestamp',
+        'end'   => 'timestamp'
+    ));
+
+    /**
+     * Create a DateTime from a timestamp
+     *
+     * @param   string  $timestamp
+     *
+     * @return  DateTime|null
+     */
+    protected function retrieveTimestamp($timestamp)
+    {
+        if ($timestamp !== null) {
+            $dateTime = new DateTime();
+            $dateTime->setTimestamp($timestamp);
+            return $dateTime;
+        }
+        return null;
+    }
+
+    /**
+     * Get a DateTime's timestamp
+     *
+     * @param   DateTime    $datetime
+     *
+     * @return  int|null
+     */
+    protected function persistTimestamp(DateTime $datetime)
+    {
+        return $datetime === null ? null : $datetime->getTimestamp();
+    }
+
+    /**
+     * Before-insert trigger (per row)
+     *
+     * @param   ConfigObject    $new    The original data to insert
+     *
+     * @return  ConfigObject            The eventually modified data to insert
+     */
+    protected function onInsertAnnouncement(ConfigObject $new)
+    {
+        if (! isset($new->id)) {
+            $new->id = uniqid();
+        }
+        if (! isset($new->hash)) {
+            $announcement = new Announcement($new->toArray());
+            $new->hash = $announcement->getHash();
+        }
+
+        return $new;
+    }
+
+    /**
+     * Before-update trigger (per row)
+     *
+     * @param   ConfigObject    $old    The original data as currently stored
+     * @param   ConfigObject    $new    The original data to update
+     *
+     * @return  ConfigObject            The eventually modified data to update
+     */
+    protected function onUpdateAnnouncement(ConfigObject $old, ConfigObject $new)
+    {
+        if ($new->message !== $old->message) {
+            $announcement = new Announcement($new->toArray());
+            $new->hash = $announcement->getHash();
+        }
+
+        return $new;
+    }
+
+    /**
+     * Get the ETag of the announcements.ini file
+     *
+     * @return  string
+     */
+    public function getEtag()
+    {
+        $file = $this->getDataSource('announcement')->getConfigFile();
+        $mtime = filemtime($file);
+        $size = filesize($file);
+        return hash('crc32', $mtime . $size);
+    }
+
+    /**
+     * Get the query for all active announcements
+     *
+     * @return  SimpleQuery
+     */
+    public function findActive()
+    {
+        $now = new DateTime();
+        $query = $this
+            ->select(array('hash', 'message'))
+            ->setFilter(new FilterAnd(array(
+                Filter::expression('start', '<=', $now),
+                Filter::expression('end', '>=', $now)
+            )))
+            ->order('start');
+        return $query;
+    }
+
+    /**
+     * Get the timestamp of the next active announcement
+     *
+     * @return  int|null
+     */
+    public function findNextActive()
+    {
+        $now = new DateTime();
+        $query = $this
+            ->select(array('start'))
+            ->setFilter(Filter::expression('start', '>', $now))
+            ->order('start')
+            ->limit(1);
+        $nextActive = $query->fetchRow();
+        return $nextActive !== false ? $nextActive->start->getTimestamp() : null;
+    }
+}
diff --git a/library/Icinga/Web/Widget/Announcements.php b/library/Icinga/Web/Widget/Announcements.php
new file mode 100644
index 000000000..8481a2856
--- /dev/null
+++ b/library/Icinga/Web/Widget/Announcements.php
@@ -0,0 +1,54 @@
+<?php
+/* Icinga Web 2 | (c) 2016 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Widget;
+
+use Icinga\Application\Icinga;
+use Icinga\Data\Filter\Filter;
+use Icinga\Forms\Announcement\AcknowledgeAnnouncementForm;
+use Icinga\Web\Announcement\AnnouncementCookie;
+use Icinga\Web\Announcement\AnnouncementIniRepository;
+
+/**
+ * Render announcements
+ */
+class Announcements extends AbstractWidget
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function render()
+    {
+        $repo = new AnnouncementIniRepository();
+        $etag = $repo->getEtag();
+        $cookie = new AnnouncementCookie();
+        if ($cookie->getEtag() !== $etag) {
+            $cookie->setEtag($etag);
+            $cookie->setNextActive($repo->findNextActive());
+            Icinga::app()->getResponse()->setCookie($cookie);
+        }
+        $acked = array();
+        foreach ($cookie->getAcknowledged() as $hash) {
+            $acked[] = Filter::expression('hash', '!=', $hash);
+        }
+        $acked = Filter::matchAll($acked);
+        $announcements = $repo->findActive();
+        $announcements->applyFilter($acked);
+        if ($announcements->hasResult()) {
+            $html = '<ul role="alert" id="announcements">';
+            foreach ($announcements as $announcement) {
+                $ackForm = new AcknowledgeAnnouncementForm();
+                $ackForm->populate(array('hash' => $announcement->hash));
+                $html .= '<li><div>'
+                    . $this->view()->escape($announcement->message)
+                    . '</div>'
+                    . $ackForm
+                    . '</li>';
+            }
+            $html .= '</ul>';
+            return $html;
+        }
+        // Force container update on XHR
+        return '<div style="display: none;"></div>';
+    }
+}
diff --git a/public/css/icinga/forms.less b/public/css/icinga/forms.less
index 5b65945c5..0ac312314 100644
--- a/public/css/icinga/forms.less
+++ b/public/css/icinga/forms.less
@@ -64,8 +64,9 @@ input.search {
   }
 }
 
-// TODO(el): .form-inline control-group { display: inline-block; }
-form.inline {
+// TODO(el): .form-controls-inline control-group { display: inline-block; }
+form.inline,
+.form-inline {
   .control-group {
     padding: 0;
   }
diff --git a/public/css/icinga/widgets.less b/public/css/icinga/widgets.less
index 55257e89d..ad5fd7432 100644
--- a/public/css/icinga/widgets.less
+++ b/public/css/icinga/widgets.less
@@ -1,5 +1,50 @@
 /*! Icinga Web 2 | (c) 2014 Icinga Development Team | GPLv2+ */
 
+#announcements > ul {
+  background-color: @body-bg-color;
+  font-size: @font-size;
+  list-style: none;
+  margin: 0;
+  padding: 0;
+
+  > li:before {
+    color: @icinga-blue;
+    content: "\e811";
+    font-family: 'ifont';
+    left: 1em;
+    margin-top: -0.8em;
+    padding: 0.3em;
+    position: absolute;
+    text-align: center;
+    top: 50%;
+  }
+
+  > li {
+    border-bottom: 1px solid @gray-lighter;
+    padding: 1em 3em;
+    position: relative;
+  }
+
+  > li .message {
+    display: inline-block;
+    vertical-align: middle;
+  }
+
+  > li:last-child {
+    border-bottom: none;
+  }
+
+  .acknowledge-announcement-control {
+    background: none;
+    border: none;
+    display: block;
+    margin-top: -0.6em;
+    position: absolute;
+    right: 1em;
+    top: 50%;
+  }
+}
+
 table.historycolorgrid {
   font-size: 1.5em;
 }
diff --git a/public/js/icinga/loader.js b/public/js/icinga/loader.js
index 096606291..45ea6e85e 100644
--- a/public/js/icinga/loader.js
+++ b/public/js/icinga/loader.js
@@ -445,6 +445,10 @@
                 return;
             }
 
+            if (req.getResponseHeader('X-Icinga-Announcements') === 'refresh') {
+                _this.loadUrl(_this.url('/layout/announcements'), $('#announcements'));
+            }
+
             // div helps getting an XML tree
             var $resp = $('<div>' + req.responseText + '</div>');
             var active = false;