Prepend slug to exported filenames (#719)

src/pretix/base/exporters/invoices.py

@@ -26,7 +26,7 @@ class InvoiceExporter(BaseExporter):
                     i.file.close()
 
             with open(os.path.join(d, 'tmp.zip'), 'rb') as zipf:
-                return 'invoices.zip', 'application/zip', zipf.read()
+                return '{}_invoices.zip'.format(self.event.slug), 'application/zip', zipf.read()
 
 
 @receiver(register_data_exporters, dispatch_uid="exporter_invoices")

src/pretix/base/exporters/json.py

@@ -101,7 +101,7 @@ class JSONExporter(BaseExporter):
             }
         }
 
-        return 'pretixdata.json', 'application/json', json.dumps(jo, cls=DjangoJSONEncoder)
+        return '{}_pretixdata.json'.format(self.event.slug), 'application/json', json.dumps(jo, cls=DjangoJSONEncoder)
 
 
 @receiver(register_data_exporters, dispatch_uid="exporter_json")

src/pretix/base/exporters/mail.py

@@ -23,7 +23,7 @@ class MailExporter(BaseExporter):
         ).values('attendee_email')
         data = "\r\n".join(set(a['email'] for a in addrs)
                            | set(a['attendee_email'] for a in pos if a['attendee_email']))
-        return 'pretixemails.txt', 'text/plain', data.encode("utf-8")
+        return '{}_pretixemails.txt'.format(self.event.slug), 'text/plain', data.encode("utf-8")
 
     @property
     def export_form_fields(self):

src/pretix/base/exporters/orderlist.py

@@ -171,7 +171,7 @@ class QuotaListExporter(BaseExporter):
             ]
             writer.writerow(row)
 
-        return 'quotas.csv', 'text/csv', output.getvalue().encode("utf-8")
+        return '{}_quotas.csv'.format(self.event.slug), 'text/csv', output.getvalue().encode("utf-8")
 
 
 @receiver(register_data_exporters, dispatch_uid="exporter_orderlist")