From d1604b038875dc0ccd1012b4b7b1453a3c222594 Mon Sep 17 00:00:00 2001
From: dfuhrmann3 <dfuhrmann3@wbsedu.de>
Date: Fri, 3 Jul 2026 13:25:51 +0200
Subject: [PATCH] ZUGFeRD fix 3

---
 main.py | 61 +++++++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 59 insertions(+), 2 deletions(-)

diff --git a/main.py b/main.py
index e7ea1a7..f822153 100644
--- a/main.py
+++ b/main.py
@@ -583,15 +583,72 @@ with col2:
             )
         else:
             try:
-                # 🔥 FIX: mime-Parameter entfernt, da von PyMuPDF nicht unterstützt
                 original_pdf_bytes = uploaded_file.getvalue()
                 doc = fitz.open(stream=original_pdf_bytes, filetype="pdf")
+                
+                # 🔥 OPTIMIERUNG 1: Setze das zwingend erforderliche PDF/A-3 Beziehungs-Flag 'Alternative'
                 doc.embfile_add(
                     "factur-x.xml",
                     xml_string.encode("utf-8"),
                     filename="factur-x.xml",
-                    desc="Factur-X/ZUGFeRD E-Invoice"
+                    desc="Factur-X/ZUGFeRD E-Invoice",
+                    relationship="Alternative"
                 )
+                
+                # 🔥 OPTIMIERUNG 2: Injiziere das offizielle Factur-X / ZUGFeRD 2.x XMP-Schema in den PDF-Header
+                xmp_xml = """<?xpacket begin="" id="W5M0MpCehiHzreSzNTczkc9d"?>
+<x:xmpmeta xmlns:x="adobe:ns:meta/">
+   <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
+      <rdf:Description rdf:about="" xmlns:pdfaExtension="http://www.aiim.org/pdfa/ns/extension/" xmlns:pdfaSchema="http://www.aiim.org/pdfa/ns/schema/" xmlns:pdfaProperty="http://www.aiim.org/pdfa/ns/property#">
+         <pdfaExtension:schemas>
+            <rdf:Bag>
+               <rdf:li rdf:parseType="Resource">
+                  <pdfaSchema:schema>Factur-X PDFA Extension Schema</pdfaSchema:schema>
+                  <pdfaSchema:prefix>fx</pdfaSchema:prefix>
+                  <pdfaSchema:namespace>urn:factur-x:pdfa:CrossIndustryDocument:invoice:1p0#</pdfaSchema:namespace>
+                  <pdfaSchema:properties>
+                     <rdf:Seq>
+                        <rdf:li rdf:parseType="Resource">
+                           <pdfaProperty:name>DocumentType</pdfaProperty:name>
+                           <pdfaProperty:valueType>Text</pdfaProperty:valueType>
+                           <pdfaProperty:category>external</pdfaProperty:category>
+                           <pdfaProperty:description>The type of the document, usually INVOICE</pdfaProperty:description>
+                        </rdf:li>
+                        <rdf:li rdf:parseType="Resource">
+                           <pdfaProperty:name>DocumentFileName</pdfaProperty:name>
+                           <pdfaProperty:valueType>Text</pdfaProperty:valueType>
+                           <pdfaProperty:category>external</pdfaProperty:category>
+                           <pdfaProperty:description>The name of the embedded file</pdfaProperty:description>
+                        </rdf:li>
+                        <rdf:li rdf:parseType="Resource">
+                           <pdfaProperty:name>Version</pdfaProperty:name>
+                           <pdfaProperty:valueType>Text</pdfaProperty:valueType>
+                           <pdfaProperty:category>external</pdfaProperty:category>
+                           <pdfaProperty:description>The version of the document type schema</pdfaProperty:description>
+                        </rdf:li>
+                        <rdf:li rdf:parseType="Resource">
+                           <pdfaProperty:name>ConformanceLevel</pdfaProperty:name>
+                           <pdfaProperty:valueType>Text</pdfaProperty:valueType>
+                           <pdfaProperty:category>external</pdfaProperty:category>
+                           <pdfaProperty:description>The conformance level of the document</pdfaProperty:description>
+                        </rdf:li>
+                     </rdf:Seq>
+                  </pdfaSchema:properties>
+               </rdf:li>
+            </rdf:Bag>
+         </pdfaExtension:schemas>
+      </rdf:Description>
+      <rdf:Description rdf:about="" xmlns:fx="urn:factur-x:pdfa:CrossIndustryDocument:invoice:1p0#">
+         <fx:DocumentType>INVOICE</fx:DocumentType>
+         <fx:DocumentFileName>factur-x.xml</fx:DocumentFileName>
+         <fx:Version>1.0</fx:Version>
+         <fx:ConformanceLevel>XRECHNUNG</fx:ConformanceLevel>
+      </rdf:Description>
+   </rdf:RDF>
+</x:xmpmeta>
+<?xpacket end="w"?>"""
+                
+                doc.set_xmp_metadata(xmp_xml)
                 zugferd_pdf_bytes = doc.tobytes()
                 doc.close()