generayion du XML a partir d'un template

template_helper.py

@@ -3,7 +3,7 @@ Helper pour injecter automatiquement current_user dans le contexte Jinja2.
 """
 from fastapi import Request
 from fastapi.templating import Jinja2Templates
-from starlette.responses import HTMLResponse
+from starlette.responses import HTMLResponse, Response
 
 
 def render(templates: Jinja2Templates, template_name: str,
@@ -17,3 +17,20 @@ def render(templates: Jinja2Templates, template_name: str,
     response = templates.TemplateResponse(template_name, ctx)
     response.status_code = status_code
     return response
+
+def render_xml(templates: Jinja2Templates, template_name: str,
+               request: Request, invoice: "Invoice",
+               filename: str = "factur-x.xml") -> Response:
+
+    xml_content = templates.env.get_template(template_name).render(
+        request=request,
+        invoice=invoice,
+        seller=invoice.seller,
+        buyer=invoice.buyer,
+    )
+
+    return Response(
+        content=xml_content,
+        media_type="application/xml",
+        headers={"Content-Disposition": f'attachment; filename="{filename}"'}
+    )