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27 lines
1.3 KiB
Markdown
27 lines
1.3 KiB
Markdown
3 years ago
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# MSC3375: Room Version 9
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A new room version, `9`, is proposed using [room version 8](https://spec.matrix.org/unstable/rooms/v8/)
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as a base and incorporating the following:
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The redaction rules for room version 9 are updated, such that `m.room.member`
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events allow the `join_authorised_via_users_server` key in addition to the
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`membership` key.
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Though other MSCs are capable of being included in this version, they do not have
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sufficient implementation to be considered for this room version. A future room
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version may include them.
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Room version `9` upon being added to the specification shall be considered stable.
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No other room versions are affected by this MSC.
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## Background
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Protecting this key from redaction was missing in [MSC3083](https://github.com/matrix-org/matrix-doc/blob/main/proposals/3083-restricted-rooms.md).
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By redacting it, new servers which join a room are unable to properly authorise
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`m.room.member` events which include the `join_authorised_via_users_server` key
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and have been redacted. This can cause a split-brained room where some servers
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believe a member is joined and other servers do not see the member in the room.
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Note that a new room version is necessary since this will change that event ID
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calculation of the `m.room.member` event (and thus is not backwards compatible).
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