correction pour conformité complete PDF/A-3

codé avec l'aide de claude IA

routers/factures.py

@@ -159,29 +159,64 @@ def changer_statut_facture(
 
 from generate_facturx_jinja2 import  Invoice, Party, Address, InvoiceLine, filter_amount, filter_datefmt
 
-
-@router.get("/{facture_id}/pdf", response_class=HTMLResponse)
+@router.get("/{facture_id}/pdf")
 def telecharger_pdf(request: Request, facture_id: int, db: Session = Depends(get_db)):
-    from weasyprint import HTML
+    from weasyprint import HTML, Attachment
+    from facturx import generate_from_binary
+    import hashlib
+    import pikepdf
+    from pikepdf import Name
+    import io
+
     facture = db.query(Facture).get(facture_id)
     if not facture:
         raise HTTPException(status_code=404)
 
+    # 1. XML Factur-X
+    invoice = get_invoice_data(facture_id, db)
+    xml_str = generate_facturx_xml(invoice)
+    xml_bytes = xml_str.encode("utf-8")
+
+    # 2. Rendu HTML → PDF simple (pas PDF/A-3 ici)
     html_content = templates.get_template("pdf/facture.html").render({
         "facture": facture,
         "settings": settings,
     })
+    pdf_bytes = HTML(string=html_content, base_url=".").write_pdf(
+        pdf_variant="pdf/a-3b",
+    )
 
-    pdf_bytes = HTML(string=html_content, base_url=".").write_pdf()
+    # 3. generate_from_binary gère :
+    #    - l'intégration du XML
+    #    - les métadonnées XMP Factur-X (DocumentType, DocumentFileName, etc.)
+    #    - la conformité PDF/A-3b
+    pdf_bytes = generate_from_binary(
+        pdf_bytes,
+        xml_bytes,
+        flavor="factur-x",
+        level="BASIC",
+    )
+
+    # 4. Corriger uniquement /EF/F/Subtype → /text/xml avec pikepdf
+    pdf_io = io.BytesIO(pdf_bytes)
+    with pikepdf.open(pdf_io) as pdf:
+        names = pdf.Root.Names.EmbeddedFiles.Names
+        i = 0
+        while i < len(names):
+            i += 1  # sauter la clé (string)
+            if i < len(names):
+                obj = names[i]
+                try:
+                    obj.EF.F.Subtype = Name("/text/xml")
+                except Exception:
+                    pass
+            i += 1
+
+        output = io.BytesIO()
+        pdf.save(output)
+        pdf_bytes = output.getvalue()
 
     filename = f"facture-{facture.numero}.pdf"
-
-    xml_bytes = generate_facturx_xml(get_invoice_data(facture_id, db))
-
-    pdf_bytes = generate_from_binary(pdf_bytes, xml_bytes)
-
-    filename = f"facture-{facture.numero}.pdf"
-
     return Response(
         content=pdf_bytes,
         media_type="application/pdf",