diff --git a/synapse/push/push_rule_evaluator.py b/synapse/push/push_rule_evaluator.py
index 8e0d3a416d..2d79ada189 100644
--- a/synapse/push/push_rule_evaluator.py
+++ b/synapse/push/push_rule_evaluator.py
@@ -16,7 +16,7 @@
import logging
import re
-from typing import Pattern
+from typing import Any, Dict, List, Pattern, Union
from synapse.events import EventBase
from synapse.types import UserID
@@ -72,13 +72,36 @@ def _test_ineq_condition(condition, number):
return False
-def tweaks_for_actions(actions):
+def tweaks_for_actions(actions: List[Union[str, Dict]]) -> Dict[str, Any]:
+ """
+ Converts a list of actions into a `tweaks` dict (which can then be passed to
+ the push gateway).
+
+ This function ignores all actions other than `set_tweak` actions, and treats
+ absent `value`s as `True`, which agrees with the only spec-defined treatment
+ of absent `value`s (namely, for `highlight` tweaks).
+
+ Args:
+ actions: list of actions
+ e.g. [
+ {"set_tweak": "a", "value": "AAA"},
+ {"set_tweak": "b", "value": "BBB"},
+ {"set_tweak": "highlight"},
+ "notify"
+ ]
+
+ Returns:
+ dictionary of tweaks for those actions
+ e.g. {"a": "AAA", "b": "BBB", "highlight": True}
+ """
tweaks = {}
for a in actions:
if not isinstance(a, dict):
continue
- if "set_tweak" in a and "value" in a:
- tweaks[a["set_tweak"]] = a["value"]
+ if "set_tweak" in a:
+ # value is allowed to be absent in which case the value assumed
+ # should be True.
+ tweaks[a["set_tweak"]] = a.get("value", True)
return tweaks
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