matrix-org/synapse

Federation: /rooms/.../members fails for the invites received from a federated server

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#4,985 opened on Apr 1, 2019

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 (5 comments) (0 reactions) (0 assignees)Python (11,713 stars) (2,196 forks)batch import
A-FederationA-InviteA-Spec-ComplianceO-UncommonS-TolerableT-Defectgood first issue

Description

Description get /_matrix/client/r0/rooms/{roomId}/members on an invite received from another federated server fails with the following error:

errcode = "M_NOT_FOUND";
error = "Can't find event for token Token(room_key=u'xxx', presence_key=u'xxx', typing_key=u'x', receipt_key=u'xxx', account_data_key=u'xxx', push_rules_key=u'xx', to_device_key=u'xxx', device_list_key=u'xxx', groups_key=u'xx')";

Steps to reproduce Consider 2 users userA and userB, created on 2 different Homeservers. userA creates a room and invites userB When userB requests for the members of this room, he gets an error

Contributor guide

Tech stack
python
Domain
backend
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Matrix federation knowledgePython developmentSynapse server internals
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
30
Research direction
Investigate the `M NOT FOUND` error when fetching room members for a federated invite. The error likely originates from token handling in the federation endpoint. Look at the `/ matrix/client/r0/rooms/{roomId}/members` handler and the federation module for event token validation. Check related discussions in other issues or PRs for similar fixes.