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-rw-r--r--synapse/app/generic_worker.py7
-rw-r--r--synapse/config/experimental.py2
-rw-r--r--synapse/handlers/presence.py12
3 files changed, 18 insertions, 3 deletions
diff --git a/synapse/app/generic_worker.py b/synapse/app/generic_worker.py
index 236d98a29d..207d5ccd02 100644
--- a/synapse/app/generic_worker.py
+++ b/synapse/app/generic_worker.py
@@ -302,6 +302,8 @@ class GenericWorkerPresence(BasePresenceHandler):
             self.send_stop_syncing, UPDATE_SYNCING_USERS_MS
         )
 
+        self._busy_presence_enabled = hs.config.experimental.msc3026_enabled
+
         hs.get_reactor().addSystemEventTrigger(
             "before",
             "shutdown",
@@ -439,8 +441,11 @@ class GenericWorkerPresence(BasePresenceHandler):
             PresenceState.ONLINE,
             PresenceState.UNAVAILABLE,
             PresenceState.OFFLINE,
-            PresenceState.BUSY,
         )
+
+        if self._busy_presence_enabled:
+            valid_presence += (PresenceState.BUSY,)
+
         if presence not in valid_presence:
             raise SynapseError(400, "Invalid presence state")
 
diff --git a/synapse/config/experimental.py b/synapse/config/experimental.py
index b1c1c51e4d..2f0cd0cfdf 100644
--- a/synapse/config/experimental.py
+++ b/synapse/config/experimental.py
@@ -27,3 +27,5 @@ class ExperimentalConfig(Config):
 
         # MSC2858 (multiple SSO identity providers)
         self.msc2858_enabled = experimental.get("msc2858_enabled", False)  # type: bool
+        # MSC3026 (busy presence state)
+        self.msc3026_enabled = experimental.get("msc3026_enabled", False)  # type: bool
diff --git a/synapse/handlers/presence.py b/synapse/handlers/presence.py
index bcb99f627b..372017590d 100644
--- a/synapse/handlers/presence.py
+++ b/synapse/handlers/presence.py
@@ -104,6 +104,8 @@ class BasePresenceHandler(abc.ABC):
         self.clock = hs.get_clock()
         self.store = hs.get_datastore()
 
+        self._busy_presence_enabled = hs.config.experimental.msc3026_enabled
+
         active_presence = self.store.take_presence_startup_info()
         self.user_to_current_state = {state.user_id: state for state in active_presence}
 
@@ -730,8 +732,11 @@ class PresenceHandler(BasePresenceHandler):
             PresenceState.ONLINE,
             PresenceState.UNAVAILABLE,
             PresenceState.OFFLINE,
-            PresenceState.BUSY,
         )
+
+        if self._busy_presence_enabled:
+            valid_presence += (PresenceState.BUSY,)
+
         if presence not in valid_presence:
             raise SynapseError(400, "Invalid presence state")
 
@@ -745,7 +750,10 @@ class PresenceHandler(BasePresenceHandler):
             msg = status_msg if presence != PresenceState.OFFLINE else None
             new_fields["status_msg"] = msg
 
-        if presence == PresenceState.ONLINE or presence == PresenceState.BUSY:
+        if (
+            presence == PresenceState.ONLINE or
+            (self._busy_presence_enabled and presence == PresenceState.BUSY)
+        ):
             new_fields["last_active_ts"] = self.clock.time_msec()
 
         await self._update_states([prev_state.copy_and_replace(**new_fields)])