From 1a950150a372403a6a6454bc65a2d35b2d3e31a2 Mon Sep 17 00:00:00 2001
From: Gowtham M <gowtham.m@venbainfotech.com>
Date: Tue, 12 May 2026 15:34:27 +0530
Subject: [PATCH] GWM : merge pdf

---
 app/Helpers/merge_pdf_helper.php | 85 +++++++++++++++++++++++++++++---
 1 file changed, 77 insertions(+), 8 deletions(-)

diff --git a/app/Helpers/merge_pdf_helper.php b/app/Helpers/merge_pdf_helper.php
index 4498b9f8..a192e33e 100644
--- a/app/Helpers/merge_pdf_helper.php
+++ b/app/Helpers/merge_pdf_helper.php
@@ -141,14 +141,8 @@ if (! function_exists('merge_ticket_pdfs')) {
                 $src = $sourceFile['path'];
                 try {
                     if ($sourceFile['mime'] === 'application/pdf') {
-                        $pageCount = $mpdf->setSourceFile($src);
-                        for ($p = 1; $p <= $pageCount; $p++) {
-                            $tplId = $mpdf->importPage($p);
-                            $mpdf->AddPage();
-                            // adjustPageSize=true makes the output page match the imported page.
-                            $mpdf->useTemplate($tplId, 0, 0, null, null, true);
-                            $totalPages++;
-                        }
+                        $pageCount = merge_ticket_pdf_add_pdf_pages($mpdf, $src, $tempDir);
+                        $totalPages += $pageCount;
                         log_message('error', "merge_ticket_pdfs | added PDF | file={$src} | pages={$pageCount}");
                     } elseif (in_array($sourceFile['mime'], ['image/jpeg', 'image/png'], true)) {
                         if (merge_ticket_pdf_add_image_page($mpdf, $src)) {
@@ -226,6 +220,81 @@ if (! function_exists('merge_ticket_pdfs')) {
     }
 }
 
+if (! function_exists('merge_ticket_pdf_add_pdf_pages')) {
+    /**
+     * Import PDF pages. If FPDI cannot import the source (commonly encrypted
+     * PDFs), normalize through Ghostscript and retry.
+     */
+    function merge_ticket_pdf_add_pdf_pages(Mpdf $mpdf, string $pdfPath, string $tempDir): int
+    {
+        try {
+            return merge_ticket_pdf_import_pdf_pages($mpdf, $pdfPath);
+        } catch (\Throwable $e) {
+            log_message('error', "merge_ticket_pdfs | direct PDF import failed | file={$pdfPath} | " . $e->getMessage());
+
+            $normalizedPath = merge_ticket_pdf_normalize_with_ghostscript($pdfPath, $tempDir);
+            if ($normalizedPath === null) {
+                throw $e;
+            }
+
+            try {
+                $pageCount = merge_ticket_pdf_import_pdf_pages($mpdf, $normalizedPath);
+                log_message('error', "merge_ticket_pdfs | Ghostscript normalized PDF imported | original={$pdfPath} | normalized={$normalizedPath} | pages={$pageCount}");
+                @unlink($normalizedPath);
+                return $pageCount;
+            } catch (\Throwable $normalizedError) {
+                @unlink($normalizedPath);
+                throw $normalizedError;
+            }
+        }
+    }
+}
+
+if (! function_exists('merge_ticket_pdf_import_pdf_pages')) {
+    function merge_ticket_pdf_import_pdf_pages(Mpdf $mpdf, string $pdfPath): int
+    {
+        $pageCount = $mpdf->setSourceFile($pdfPath);
+        for ($p = 1; $p <= $pageCount; $p++) {
+            $tplId = $mpdf->importPage($p);
+            $mpdf->AddPage();
+            // adjustPageSize=true makes the output page match the imported page.
+            $mpdf->useTemplate($tplId, 0, 0, null, null, true);
+        }
+
+        return $pageCount;
+    }
+}
+
+if (! function_exists('merge_ticket_pdf_normalize_with_ghostscript')) {
+    function merge_ticket_pdf_normalize_with_ghostscript(string $pdfPath, string $tempDir): ?string
+    {
+        $ghostscript = is_executable('/usr/bin/gs') ? '/usr/bin/gs' : trim((string) @shell_exec('command -v gs 2>/dev/null'));
+        if ($ghostscript === '' || ! is_executable($ghostscript)) {
+            log_message('error', "merge_ticket_pdfs | Ghostscript not available for PDF normalization | file={$pdfPath}");
+            return null;
+        }
+
+        $normalizedPath = rtrim($tempDir, '/\\') . DIRECTORY_SEPARATOR . 'normalized_' . uniqid('', true) . '.pdf';
+        $cmd = escapeshellarg($ghostscript)
+            . ' -q -dNOPAUSE -dBATCH -dSAFER -sDEVICE=pdfwrite -dCompatibilityLevel=1.4'
+            . ' -sOutputFile=' . escapeshellarg($normalizedPath)
+            . ' ' . escapeshellarg($pdfPath)
+            . ' 2>&1';
+
+        $output = [];
+        $exitCode = 1;
+        @exec($cmd, $output, $exitCode);
+
+        if ($exitCode !== 0 || ! is_file($normalizedPath) || filesize($normalizedPath) <= 0) {
+            log_message('error', 'merge_ticket_pdfs | Ghostscript normalization failed | file=' . $pdfPath . ' | exit=' . $exitCode . ' | output=' . implode(' ', $output));
+            @unlink($normalizedPath);
+            return null;
+        }
+
+        return $normalizedPath;
+    }
+}
+
 if (! function_exists('merge_ticket_pdf_resolve_mime')) {
     /**
      * Resolve file type from stored MIME, filesystem MIME, and extension.