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Enforce the max length for per-room display names / avatar URLs. (#10654)

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To match the maximum lengths allowed for profile data.
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Azrenbeth 2021-08-23 16:25:33 +01:00 committed by GitHub
parent 3e83f97154
commit 0c1d6f65d7
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2 changed files with 17 additions and 1 deletions
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1
changelog.d/10654.bugfix Normal file
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@ -0,0 +1 @@
Enforce the maximum length for per-room display names and avatar URLs.

17
synapse/handlers/room_member.py
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@ -36,6 +36,7 @@ from synapse.api.ratelimiting import Ratelimiter
from synapse.event_auth import get_named_level, get_power_level_event
from synapse.events import EventBase
from synapse.events.snapshot import EventContext
from synapse.handlers.profile import MAX_AVATAR_URL_LEN, MAX_DISPLAYNAME_LEN
from synapse.types import (
JsonDict,
Requester,
@ -79,7 +80,7 @@ class RoomMemberHandler(metaclass=abc.ABCMeta):
self.account_data_handler = hs.get_account_data_handler()
self.event_auth_handler = hs.get_event_auth_handler()
self.member_linearizer = Linearizer(name="member")
self.member_linearizer: Linearizer = Linearizer(name="member")
self.clock = hs.get_clock()
self.spam_checker = hs.get_spam_checker()
@ -556,6 +557,20 @@ class RoomMemberHandler(metaclass=abc.ABCMeta):
content.pop("displayname", None)
content.pop("avatar_url", None)
if len(content.get("displayname") or "") > MAX_DISPLAYNAME_LEN:
raise SynapseError(
400,
f"Displayname is too long (max {MAX_DISPLAYNAME_LEN})",
errcode=Codes.BAD_JSON,
)
if len(content.get("avatar_url") or "") > MAX_AVATAR_URL_LEN:
raise SynapseError(
400,
f"Avatar URL is too long (max {MAX_AVATAR_URL_LEN})",
errcode=Codes.BAD_JSON,
)
effective_membership_state = action
if action in ["kick", "unban"]:
effective_membership_state = "leave"