Mail: Fix stuck state when tickets are not available (Z#23225229)

This reverts commit fbd8bbbeaa.

src/pretix/base/services/mail.py

@@ -389,7 +389,7 @@ def mail_send_task(self, **kwargs) -> bool:
         # mail_send_task(self, *, outgoing_mail)
         with scopes_disabled():
             mail_send(**kwargs)
-        return
+        return False
     else:
         raise ValueError("Unknown arguments")
 
@@ -443,15 +443,24 @@ def mail_send_task(self, **kwargs) -> bool:
                         content = ct.file.read()
                         args.append((name, content, ct.type))
                         attach_size += len(content)
-                    except Exception:
+                    except Exception as e:
                         # This sometimes fails e.g. with FileNotFoundError. We haven't been able to figure out
                         # why (probably some race condition with ticket cache invalidation?), so retry later.
                         try:
-                            self.retry(max_retries=5, countdown=60)
+                            logger.exception(f'Could not attach tickets to email {outgoing_mail.guid}, will retry')
+                            retry_after = 60
+                            outgoing_mail.error = "Tickets not ready"
+                            outgoing_mail.error_detail = str(e)
+                            outgoing_mail.sent = now()
+                            outgoing_mail.status = OutgoingMail.STATUS_AWAITING_RETRY
+                            outgoing_mail.retry_after = now() + timedelta(seconds=retry_after)
+                            outgoing_mail.save(update_fields=["status", "error", "error_detail", "sent", "retry_after",
+                                                              "actual_attachments"])
+                            self.retry(max_retries=5, countdown=retry_after)
                         except MaxRetriesExceededError:
                             # Well then, something is really wrong, let's send it without attachment before we
                             # don't send at all
-                            logger.exception(f'Could not attach tickets to email {outgoing_mail.guid}')
+                            logger.exception(f'Too many retries attaching tickets to email {outgoing_mail.guid}, skip attachment')
                             pass
 
                 if attach_size * 1.37 < settings.FILE_UPLOAD_MAX_SIZE_EMAIL_ATTACHMENT - 1024 * 1024:

src/pretix/helpers/cookies.py

@@ -34,10 +34,7 @@ def set_cookie_without_samesite(request, response, key, *args, **kwargs):
     if not is_secure:
         # https://www.chromestatus.com/feature/5633521622188032
         return
-
-    useragent = request.headers.get('User-Agent', '')
-
-    if should_send_same_site_none(useragent):
+    if should_send_same_site_none(request.headers.get('User-Agent', '')):
         # Chromium is rolling out SameSite=Lax as a default
         # https://www.chromestatus.com/feature/5088147346030592
         # This however breaks all pretix-in-an-iframe things, such as the pretix Widget.
@@ -47,29 +44,8 @@ def set_cookie_without_samesite(request, response, key, *args, **kwargs):
         # This will only work on secure cookies as well
         # https://www.chromestatus.com/feature/5633521622188032
         response.cookies[key]['secure'] = is_secure
-
-        if can_send_partitioned_cookie(useragent):
-            # CHIPS
-            response.cookies[key]['Partitioned'] = True
-
-
-def can_send_partitioned_cookie(useragent):
-    # Safari currently exhibits a bug where Partitioned cookies (CHIPS) are not
-    # sent back to the originating site after multi-hop cross-site redirects,
-    # breaking SSO login flows in pretix.
-    #
-    # Partitioned cookies were initially introduced in Safari 18.4, removed
-    # again in 18.5 due to a bug, and reintroduced in Safari 26.2, where the
-    # current issue is present.
-    #
-    # Once the Safari issue is fixed, this check should be refined to be
-    # conditional on the affected versions only.
-    #
-    # WebKit issues:
-    #
-    #   - https://bugs.webkit.org/show_bug.cgi?id=292975
-    #   - https://bugs.webkit.org/show_bug.cgi?id=306194
-    return not is_safari(useragent)
+        # CHIPS
+        response.cookies[key]['Partitioned'] = True
 
 
 # Based on https://www.chromium.org/updates/same-site/incompatible-clients