From 38ea3f761399d466d4578a25a7faea4e14f386ef Mon Sep 17 00:00:00 2001
From: HorstOeko <horstoeko@erling.com.de>
Date: Sat, 7 Dec 2024 10:36:47 +0100
Subject: [PATCH] [ENH] Add deterministic Mode to
 ZugferdDocumentPdfBuilderAbstract (and derived classes). This mode should
 only used for testing purposes

---
 src/ZugferdDocumentPdfBuilderAbstract.php | 14 +++++
 src/ZugferdPdfWriter.php                  | 67 ++++++++++++++++++-----
 2 files changed, 68 insertions(+), 13 deletions(-)

diff --git a/src/ZugferdDocumentPdfBuilderAbstract.php b/src/ZugferdDocumentPdfBuilderAbstract.php
index 6f238fe..9309904 100644
--- a/src/ZugferdDocumentPdfBuilderAbstract.php
+++ b/src/ZugferdDocumentPdfBuilderAbstract.php
@@ -339,6 +339,20 @@ public function attachAdditionalFileByContent(string $content, string $filename,
         return $this;
     }
 
+    /**
+     * Set the the deterministic mode. This mode should only be used
+     * for testing purposes
+     *
+     * @param  bool $deterministicModeEnabled
+     * @return static
+     */
+    public function setDeterministicModeEnabled(bool $deterministicModeEnabled)
+    {
+        $this->pdfWriter->setDeterministicModeEnabled($deterministicModeEnabled);
+
+        return $this;
+    }
+
     /**
      * Get the content of XML to attach
      *
diff --git a/src/ZugferdPdfWriter.php b/src/ZugferdPdfWriter.php
index c4b43ba..5c0c053 100644
--- a/src/ZugferdPdfWriter.php
+++ b/src/ZugferdPdfWriter.php
@@ -80,11 +80,18 @@ class ZugferdPdfWriter extends PdfFpdi
     protected $openAttachmentPane = false;
 
     /**
-     * Set the PDF version.
+     * Internal flag deterministic mode. This mode should only be used
+     * for testing purposes
      *
-     * @param string $version     Contains the PDF version number.
-     * @param bool   $binary_data This is true for binary data
+     * @var boolean
+     */
+    protected $deterministicModeEnabled = false;
+
+    /**
+     * Set the PDF version.
      *
+     * @param  string $version     Contains the PDF version number.
+     * @param  bool   $binary_data This is true for binary data
      * @return void
      */
     public function setPdfVersion($version = '1.3', $binary_data = false): void
@@ -92,12 +99,11 @@ public function setPdfVersion($version = '1.3', $binary_data = false): void
         $this->PDFVersion = sprintf('%.1F', $version);
 
         if (true == $binary_data) {
-            $this->PDFVersion .=
-                "\n" . '%' .
-                chr(rand(128, 256)) .
-                chr(rand(128, 256)) .
-                chr(rand(128, 256)) .
-                chr(rand(128, 256));
+            if ($this->deterministicModeEnabled === true) {
+                $this->PDFVersion .= "\n" . '%' . chr(128) . chr(129) . chr(130) . chr(131);
+            } else {
+                $this->PDFVersion .= "\n" . '%' . chr(rand(128, 256)) . chr(rand(128, 256)) . chr(rand(128, 256)) . chr(rand(128, 256));
+            }
         }
     }
 
@@ -176,11 +182,28 @@ public function addMetadataDescriptionNode($description): void
      * The array with metadata information applied to the pdf
      * @return void
      */
-    public function setPdfMetadataInfos(array $metaDataInfos): void
+    public function setPdfMetadataInfos(array &$metaDataInfos): void
     {
+        if ($this->deterministicModeEnabled === true) {
+            $metaDataInfos['createdDate'] = date('Y-m-d\TH:i:s', strtotime("2000-01-01 23:59:59"));
+            $metaDataInfos['modifiedDate'] = date('Y-m-d\TH:i:s', strtotime("2000-01-01 23:59:59"));
+        }
+
         $this->metaDataInfos = $metaDataInfos;
     }
 
+    /**
+     * Set the status of the deterministic mode. This mode should only be used
+     * for testing purposes
+     *
+     * @param  bool $deterministicModeEnabled
+     * @return void
+     */
+    public function setDeterministicModeEnabled(bool $deterministicModeEnabled): void
+    {
+        $this->deterministicModeEnabled = $deterministicModeEnabled;
+    }
+
     /**
      * Put files.
      *
@@ -251,10 +274,14 @@ protected function putFileStream(array $file_info): void
         if (false === $fc) {
             $this->Error('Cannot open file: ' . $file_info['file']);
         }
-        if (is_string($file_info['file'])) {
-            $md = @date('YmdHis', filemtime($file_info['file']));
+        if ($this->deterministicModeEnabled === true) {
+            $md = @date('YmdHis', strtotime("2000-01-01 23:59:59"));
         } else {
-            $md = @date('YmdHis');
+            if (is_string($file_info['file'])) {
+                $md = @date('YmdHis', filemtime($file_info['file']));
+            } else {
+                $md = @date('YmdHis');
+            }
         }
         $fc = gzcompress($fc);
         $this->_put('/Length ' . strlen($fc));
@@ -429,6 +456,20 @@ protected function _puttrailer(): void
         $this->_put(sprintf('/ID [<%s><%s>]', $created_id, $modified_id));
     }
 
+    /**
+     * Put general information
+     *
+     * @return void
+     */
+    protected function _putinfo(): void
+    {
+        if ($this->deterministicModeEnabled === true) {
+            $this->CreationDate = strtotime("2000-01-01 23:59:59");
+        }
+
+        parent::_putinfo();
+    }
+
     /**
      * Generate metadata string.
      *