Swappable invoice renderers

src/pretix/base/models/event.py

@@ -326,6 +326,24 @@ class Event(LoggedModel):
                 providers[pp.identifier] = pp
         return providers
 
+    def get_invoice_renderers(self) -> dict:
+        from ..signals import register_invoice_renderers
+
+        responses = register_invoice_renderers.send(self)
+        renderers = {}
+        for receiver, response in responses:
+            if not isinstance(response, list):
+                response = [response]
+            for p in response:
+                pp = p(self)
+                renderers[pp.identifier] = pp
+        return renderers
+
+    @property
+    def invoice_renderer(self):
+        irs = self.get_invoice_renderers()
+        return irs[self.settings.invoice_renderer]
+
 
 def generate_invite_token():
     return get_random_string(length=32, allowed_chars=string.ascii_lowercase + string.digits)

src/pretix/base/models/invoices.py

@@ -9,9 +9,10 @@ from django.utils.functional import cached_property
 
 def invoice_filename(instance, filename: str) -> str:
     secret = get_random_string(length=16, allowed_chars=string.ascii_letters + string.digits)
-    return 'invoices/{org}/{ev}/{no}-{code}-{secret}.pdf'.format(
+    return 'invoices/{org}/{ev}/{no}-{code}-{secret}.{ext}'.format(
         org=instance.event.organizer.slug, ev=instance.event.slug,
-        no=instance.number, code=instance.order.code, secret=secret
+        no=instance.number, code=instance.order.code, secret=secret,
+        ext=filename.split('.')[-1]
     )