Document signing

2026-07-21 14:35:34 +02:00
parent 56b603aba0
commit 6e726ef34d
18 changed files with 1239 additions and 1 deletions
@@ -0,0 +1,63 @@
+<?php
+
+namespace App\Domains\Unterschrift\Actions\RenderPreview;
+
+use Imagick;
+use ImagickPixel;
+use RuntimeException;
+
+class RenderPreviewCommand
+{
+    /** Aufloesung fuer die Vorschaubilder (klein halten, Platzierung erfolgt relativ). */
+    private const PREVIEW_DPI = 96;
+
+    /** Maximale Seitenzahl, die verarbeitet wird. */
+    public const MAX_PAGES = 30;
+
+    public function __construct(private readonly RenderPreviewRequest $request) {}
+
+    public function execute(): RenderPreviewResponse
+    {
+        $doc = new Imagick();
+        $doc->setResolution(self::PREVIEW_DPI, self::PREVIEW_DPI);
+
+        try {
+            $doc->readImage($this->request->pdfPath);
+        } catch (\ImagickException $e) {
+            throw new RuntimeException('Das PDF konnte nicht gelesen werden.', 0, $e);
+        }
+
+        $pageCount = $doc->getNumberImages();
+
+        if ($pageCount < 1) {
+            throw new RuntimeException('Das PDF enthält keine Seiten.');
+        }
+
+        if ($pageCount > self::MAX_PAGES) {
+            throw new RuntimeException('Das PDF hat zu viele Seiten (max. ' . self::MAX_PAGES . ').');
+        }
+
+        $pages = [];
+
+        for ($i = 0; $i < $pageCount; $i++) {
+            $doc->setIteratorIndex($i);
+            $doc->setImageBackgroundColor(new ImagickPixel('white'));
+
+            if ($doc->getImageAlphaChannel()) {
+                $doc->setImageAlphaChannel(Imagick::ALPHACHANNEL_REMOVE);
+            }
+
+            $doc->setImageFormat('png');
+
+            $pages[] = [
+                'dataUri' => 'data:image/png;base64,' . base64_encode($doc->getImageBlob()),
+                'width'   => $doc->getImageWidth(),
+                'height'  => $doc->getImageHeight(),
+            ];
+        }
+
+        $doc->clear();
+
+        return new RenderPreviewResponse(pages: $pages, pageCount: $pageCount);
+    }
+}
@@ -0,0 +1,10 @@
+<?php
+
+namespace App\Domains\Unterschrift\Actions\RenderPreview;
+
+class RenderPreviewRequest
+{
+    public function __construct(
+        public readonly string $pdfPath,
+    ) {}
+}
@@ -0,0 +1,12 @@
+<?php
+
+namespace App\Domains\Unterschrift\Actions\RenderPreview;
+
+class RenderPreviewResponse
+{
+    public function __construct(
+        /** @var array<int, array{dataUri: string, width: int, height: int}> */
+        public readonly array $pages,
+        public readonly int $pageCount,
+    ) {}
+}