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-rw-r--r--synapse/federation/federation_base.py7
1 files changed, 7 insertions, 0 deletions
diff --git a/synapse/federation/federation_base.py b/synapse/federation/federation_base.py
index 6476cea895..7918d3e442 100644
--- a/synapse/federation/federation_base.py
+++ b/synapse/federation/federation_base.py
@@ -18,6 +18,7 @@ from synapse.api.errors import SynapseError
 from synapse.crypto.event_signing import check_event_content_hash
 from synapse.events import FrozenEvent
 from synapse.events.utils import prune_event
+from synapse.http.servlet import assert_params_in_request
 from synapse.util import unwrapFirstError, logcontext
 from twisted.internet import defer
 
@@ -181,7 +182,13 @@ def event_from_pdu_json(pdu_json, outlier=False):
 
     Returns:
         FrozenEvent
+
+    Raises:
+        SynapseError: if the pdu is missing required fields
     """
+    # we could probably enforce a bunch of other fields here (room_id, sender,
+    # origin, etc etc)
+    assert_params_in_request(pdu_json, ('event_id', 'type'))
     event = FrozenEvent(
         pdu_json
     )