phperror/error: provide a failsafe error message

...for PHP 5.3

fixes #1033

application/controllers/PhperrorController.php

@@ -0,0 +1,22 @@
+<?php
+
+namespace Icinga\Module\Director\Controllers;
+
+use Icinga\Web\Controller;
+
+class PhperrorController extends Controller
+{
+    public function errorAction()
+    {
+        $this->getTabs()->add('error', array(
+            'label' => $this->translate('Error'),
+            'url'   => $this->getRequest()->getUrl()
+        ))->activate('error');
+        $msg = $this->translate(
+            "PHP version 5.4.x is required for Director >= 1.4.0, you're running %s."
+            . ' Please either upgrade PHP or downgrade Icinga Director'
+        );
+        $this->view->title = $this->translate('Unsatisfied dependencies');
+        $this->view->message = sprintf($msg, PHP_VERSION);
+    }
+}

application/views/scripts/phperror/error.phtml

@@ -0,0 +1,8 @@
+<div class="controls">
+<?= $this->tabs ?>
+<h1><?= $this->escape($this->title) ?></h1>
+</div>
+
+<div class="content">
+<p class="error"><?= $this->escape($this->message) ?></p>
+</div>

run-php5.3.php

@@ -0,0 +1,26 @@
+<?php
+
+use Icinga\Application\Icinga;
+
+use Icinga\Exception\IcingaException;
+use Icinga\Web\Url;
+
+if (Icinga::app()->isCli()) {
+    throw new IcingaException(
+        "PHP version 5.4.x is required for Director >= 1.4.0, you're running %s."
+        . ' Please either upgrade PHP or downgrade Icinga Director',
+        PHP_VERSION
+    );
+} else {
+    $request = Icinga::app()->getRequest();
+    $path = $request->getPathInfo();
+    if (! preg_match('#^/director#', $path)) {
+        return;
+    }
+    if (preg_match('#^/director/phperror/error#', $path)) {
+        return;
+    }
+
+    header('Location: ' . Url::fromPath('director/phperror/error'));
+    exit;
+}

run.php

@@ -1,10 +1,16 @@
 <?php
 
-use Icinga\Application\Icinga;
+use Icinga\Application\Modules\Module;
 use ipl\Loader\CompatLoader;
 
+if (version_compare(PHP_VERSION, '5.4.0') < 0) {
+    include __DIR__ . '/run-php5.3.php';
+    return;
+}
+
 $prefix = '\\Icinga\\Module\\Director\\';
 
+/** @var Module $this */
 $this->provideHook('monitoring/HostActions');
 $this->provideHook('monitoring/ServiceActions');
 
@@ -51,7 +57,6 @@ $this->provideHook('director/Job', $prefix . 'Job\\SyncJob');
 $this->provideHook('cube/Actions', 'CubeLinks');
 
 // ipl compat, unless it is released:
-
 if (class_exists('ipl\\Html\\ValidHtml')) {
     return;
 }