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authorWill Hunt <will@half-shot.uk>2021-08-05 13:22:14 +0100
committerGitHub <noreply@github.com>2021-08-05 08:22:14 -0400
commita8a27b2b8bac2995c3edd20518680366eb543ac9 (patch)
tree7d20f9684cfc8353fcba9ee50c530a76e9115631 /synapse/handlers/appservice.py
parentAdd documentation for configuring a forward proxy. (#10443) (diff)
downloadsynapse-a8a27b2b8bac2995c3edd20518680366eb543ac9.tar.xz
Only return an appservice protocol if it has a service providing it. (#10532)
If there are no services providing a protocol, omit it completely
instead of returning an empty dictionary.

This fixes a long-standing spec compliance bug.
Diffstat (limited to 'synapse/handlers/appservice.py')
-rw-r--r--synapse/handlers/appservice.py7
1 files changed, 3 insertions, 4 deletions
diff --git a/synapse/handlers/appservice.py b/synapse/handlers/appservice.py
index 21a17cd2e8..4ab4046650 100644
--- a/synapse/handlers/appservice.py
+++ b/synapse/handlers/appservice.py
@@ -392,9 +392,6 @@ class ApplicationServicesHandler:
                     protocols[p].append(info)
 
         def _merge_instances(infos: List[JsonDict]) -> JsonDict:
-            if not infos:
-                return {}
-
             # Merge the 'instances' lists of multiple results, but just take
             # the other fields from the first as they ought to be identical
             # copy the result so as not to corrupt the cached one
@@ -406,7 +403,9 @@ class ApplicationServicesHandler:
 
             return combined
 
-        return {p: _merge_instances(protocols[p]) for p in protocols.keys()}
+        return {
+            p: _merge_instances(protocols[p]) for p in protocols.keys() if protocols[p]
+        }
 
     async def _get_services_for_event(
         self, event: EventBase