4 files changed, 6 insertions, 1 deletions
diff --git a/synapse/api/constants.py b/synapse/api/constants.py
index 691f8f9adf..cc8541bc16 100644
--- a/synapse/api/constants.py
+++ b/synapse/api/constants.py
@@ -51,6 +51,7 @@ class PresenceState:
     OFFLINE = "offline"
     UNAVAILABLE = "unavailable"
     ONLINE = "online"
+    BUSY = "org.matrix.msc3026.busy"
 
 
 class JoinRules:
diff --git a/synapse/app/generic_worker.py b/synapse/app/generic_worker.py
index 274d582d07..236d98a29d 100644
--- a/synapse/app/generic_worker.py
+++ b/synapse/app/generic_worker.py
@@ -439,6 +439,7 @@ class GenericWorkerPresence(BasePresenceHandler):
             PresenceState.ONLINE,
             PresenceState.UNAVAILABLE,
             PresenceState.OFFLINE,
+            PresenceState.BUSY,
         )
         if presence not in valid_presence:
             raise SynapseError(400, "Invalid presence state")
diff --git a/synapse/handlers/presence.py b/synapse/handlers/presence.py
index 54631b4ee2..bcb99f627b 100644
--- a/synapse/handlers/presence.py
+++ b/synapse/handlers/presence.py
@@ -730,6 +730,7 @@ class PresenceHandler(BasePresenceHandler):
             PresenceState.ONLINE,
             PresenceState.UNAVAILABLE,
             PresenceState.OFFLINE,
+            PresenceState.BUSY,
         )
         if presence not in valid_presence:
             raise SynapseError(400, "Invalid presence state")
@@ -744,7 +745,7 @@ class PresenceHandler(BasePresenceHandler):
             msg = status_msg if presence != PresenceState.OFFLINE else None
             new_fields["status_msg"] = msg
 
-        if presence == PresenceState.ONLINE:
+        if presence == PresenceState.ONLINE or presence == PresenceState.BUSY:
             new_fields["last_active_ts"] = self.clock.time_msec()
 
         await self._update_states([prev_state.copy_and_replace(**new_fields)])
diff --git a/synapse/rest/client/versions.py b/synapse/rest/client/versions.py
index d24a199318..f387d29b57 100644
--- a/synapse/rest/client/versions.py
+++ b/synapse/rest/client/versions.py
@@ -81,6 +81,8 @@ class VersionsRestServlet(RestServlet):
                     "io.element.e2ee_forced.public": self.e2ee_forced_public,
                     "io.element.e2ee_forced.private": self.e2ee_forced_private,
                     "io.element.e2ee_forced.trusted_private": self.e2ee_forced_trusted_private,
+                    # Supports the busy presence state described in MSC3026.
+                    "org.matrix.msc3026.busy_presence": True,
                 },
             },
         )