Allow "unavailable" presence status for /sync (#4592)

* Allow "unavailable" presence status for /sync

Closes #3772, closes #3779

Signed-off-by: Valentin Anger <valentin.an.1999@gmail.com>

* Add changelog for PR 4592

changelog.d/4592.feature

+Allow the "unavailable" presence status for /sync.
+This change makes Synapse compliant with r0.4.0 of the Client-Server specification.

synapse/rest/client/v2_alpha/sync.py

@@ -75,7 +75,7 @@ class SyncRestServlet(RestServlet):
     """
 
     PATTERNS = client_v2_patterns("/sync$")
-    ALLOWED_PRESENCE = set(["online", "offline"])
+    ALLOWED_PRESENCE = set(["online", "offline", "unavailable"])
 
     def __init__(self, hs):
         super(SyncRestServlet, self).__init__()

synapse/rest/client/versions.py

@@ -38,6 +38,7 @@ class VersionsRestServlet(RestServlet):
                 "r0.1.0",
                 "r0.2.0",
                 "r0.3.0",
+                "r0.4.0",
             ],
             # as per MSC1497:
             "unstable_features": {