diff options
Diffstat (limited to 'synapse/rest/client/sync.py')
| -rw-r--r-- | synapse/rest/client/sync.py | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/synapse/rest/client/sync.py b/synapse/rest/client/sync.py index 2b103ca6a8..d19aaf0e22 100644 --- a/synapse/rest/client/sync.py +++ b/synapse/rest/client/sync.py @@ -47,6 +47,7 @@ from synapse.http.site import SynapseRequest from synapse.logging.opentracing import trace_with_opname from synapse.types import JsonDict, Requester, StreamToken from synapse.util import json_decoder +from synapse.util.caches.lrucache import LruCache from ._base import client_patterns, set_timeline_upper_limit @@ -110,6 +111,11 @@ class SyncRestServlet(RestServlet): self._msc2654_enabled = hs.config.experimental.msc2654_enabled self._msc3773_enabled = hs.config.experimental.msc3773_enabled + self._json_filter_cache: LruCache[str, bool] = LruCache( + max_size=1000, + cache_name="sync_valid_filter", + ) + async def on_GET(self, request: SynapseRequest) -> Tuple[int, JsonDict]: # This will always be set by the time Twisted calls us. assert request.args is not None @@ -177,7 +183,13 @@ class SyncRestServlet(RestServlet): filter_object = json_decoder.decode(filter_id) except Exception: raise SynapseError(400, "Invalid filter JSON", errcode=Codes.NOT_JSON) - self.filtering.check_valid_filter(filter_object) + + # We cache the validation, as this can get quite expensive if people use + # a literal json blob as a query param. + if not self._json_filter_cache.get(filter_id): + self.filtering.check_valid_filter(filter_object) + self._json_filter_cache[filter_id] = True + set_timeline_upper_limit( filter_object, self.hs.config.server.filter_timeline_limit ) |