Switch from fpdi/fpdf to pdftk to be able to use more recent/secure p…

…df protection algorithm

composer.json

@@ -21,9 +21,9 @@
         "doctrine/migrations": "^3.0",
         "doctrine/orm": "^2.7",
         "knplabs/knp-gaufrette-bundle": "^0.7.2",
+        "mikehaertl/php-pdftk": "^0.13.1",
         "richcongress/bundle-toolbox": "^1.1",
         "sensio/framework-extra-bundle": "^5.4|^6.0",
-        "setasign/fpdi-protection": "^2.0",
         "symfony/translation": "^5.4",
         "symfony/twig-bundle": "^5.4"
     },

src/Domain/Pdf/Trait/PdfMergerTrait.php

@@ -4,31 +4,30 @@
 
 namespace RichId\PdfTemplateBundle\Domain\Pdf\Trait;
 
-use setasign\Fpdi\Fpdi;
-use setasign\Fpdi\PdfParser\StreamReader;
+use mikehaertl\pdftk\Pdf;
 
 trait PdfMergerTrait
 {
-    /** @param string[] $pdfs */
-    private function mergePdfs(array $pdfs): string
-    {
-        $encoder = new Fpdi();
+    use PdfTempFileTrait;
 
-        foreach ($pdfs as $pdf) {
-            $pageCount = $encoder->setSourceFile(StreamReader::createByString($pdf));
+    /** @param string[] $sources */
+    private function mergePdfs(array $sources): string
+    {
+        return $this->withTempDir(function (string $tempDir) use ($sources) {
+            $pdf = new Pdf();
+            $pdf->ignoreWarnings = true;
 
-            for ($i = 1; $i <= $pageCount; $i++) {
-                $tplidx = $encoder->importPage($i);
-                $specs = $encoder->getTemplateSize($tplidx);
+            foreach ($sources as $index => $source) {
+                $pdf->addFile($this->copySource($source, $tempDir, $index + 1));
+            }
 
-                if (\is_array($specs)) {
-                    $encoder->addPage($specs['orientation'], [$specs['width'], $specs['height']]);
-                }
+            $result = $pdf->toString();
 
-                $encoder->useTemplate($tplidx);
+            if (\is_bool($result)) {
+                throw new \Exception('Failed to generate pdf file');
             }
-        }
 
-        return $encoder->Output('S');
+            return $result;
+        });
     }
 }