Merge pull request #3529 from Icinga/feature/pdfexporthook

Introduce PdfexportHook

library/Icinga/Application/Hook/PdfexportHook.php

@@ -0,0 +1,25 @@
+<?php
+/* Icinga Web 2 | (c) 2018 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Application\Hook;
+
+/**
+ * Base class for the PDF Export Hook
+ */
+abstract class PdfexportHook
+{
+    /**
+     * Get whether PDF export is supported
+     *
+     * @return  bool
+     */
+    abstract public function isSupported();
+
+    /**
+     * Render the specified HTML to PDF and stream it to the client
+     *
+     * @param   string  $html       The HTML to render to PDF
+     * @param   string  $filename   The filename for the generated PDF
+     */
+    abstract public function streamPdfFromHtml($html, $filename);
+}

library/Icinga/File/Pdf.php

@@ -8,6 +8,7 @@ use Dompdf\Dompdf;
 use Dompdf\Options;
 use Icinga\Application\Icinga;
 use Icinga\Exception\ProgrammingError;
+use Icinga\Web\Hook;
 use Icinga\Web\Url;
 
 call_user_func(function () {
@@ -61,12 +62,29 @@ class Pdf
             'src="' . Icinga::app()->getBootstrapDirectory() . '/img/',
             $html
         );
+
+        $request = $controller->getRequest();
+
+        if (Hook::has('Pdfexport')) {
+            $pdfexport = Hook::first('Pdfexport');
+
+            if ($pdfexport->isSupported()) {
+                $pdfexport->streamPdfFromHtml($html, sprintf(
+                    '%s-%s-%d',
+                    $request->getControllerName(),
+                    $request->getActionName(),
+                    time()
+                ));
+
+                return;
+            }
+        }
+
         $options = new Options();
         $options->set('defaultPaperSize', 'A4');
         $dompdf = new Dompdf($options);
         $dompdf->loadHtml($html);
         $dompdf->render();
-        $request = $controller->getRequest();
         $dompdf->stream(
             sprintf(
                 '%s-%s-%d',

library/Icinga/Web/Widget/Tabextension/OutputFormat.php

@@ -4,6 +4,7 @@
 namespace Icinga\Web\Widget\Tabextension;
 
 use Icinga\Application\Platform;
+use Icinga\Application\Hook;
 use Icinga\Web\Url;
 use Icinga\Web\Widget\Tab;
 use Icinga\Web\Widget\Tabs;
@@ -81,7 +82,13 @@ class OutputFormat implements Tabextension
     {
         $supportedTypes = array();
 
-        if (Platform::extensionLoaded('gd')) {
+        $pdfexport = false;
+
+        if (Hook::has('Pdfexport')) {
+            $pdfexport = Hook::first('Pdfexport')->isSupported();
+        }
+
+        if ($pdfexport || Platform::extensionLoaded('gd')) {
             $supportedTypes[self::TYPE_PDF] = array(
                 'name'      => 'pdf',
                 'label'     => 'PDF',