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Always send device_one_time_keys_count (#10457)

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Fixes https://github.com/matrix-org/synapse/issues/10456
See also https://github.com/vector-im/element-android/issues/3725
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David Baker 2021-07-22 15:29:27 +01:00 committed by GitHub
parent 519ec8271f
commit 7da24b975d
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2 changed files with 8 additions and 4 deletions
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changelog.d/10457.bugfix Normal file
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@ -0,0 +1 @@
Always include `device_one_time_keys_count` key in `/sync` response to work around a bug in Element Android that broke encryption for new devices.

11
synapse/rest/client/v2_alpha/sync.py
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@ -252,10 +252,13 @@ class SyncRestServlet(RestServlet):
if sync_result.device_lists.left:
response["device_lists"]["left"] = list(sync_result.device_lists.left)
if sync_result.device_one_time_keys_count:
response[
"device_one_time_keys_count"
] = sync_result.device_one_time_keys_count
# We always include this because https://github.com/vector-im/element-android/issues/3725
# The spec isn't terribly clear on when this can be omitted and how a client would tell
# the difference between "no keys present" and "nothing changed" in terms of whole field
# absent / individual key type entry absent
# Corresponding synapse issue: https://github.com/matrix-org/synapse/issues/10456
response["device_one_time_keys_count"] = sync_result.device_one_time_keys_count
if sync_result.device_unused_fallback_key_types:
response[
"org.matrix.msc2732.device_unused_fallback_key_types"