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Fix membership state table and diagram (#3730)

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* Fix membership state table and diagram

There were 2 missing cases which are legal:
* `invite->knock` (a fairly silly thing to do, but legal under the auth rules)
* `external->leave (via /kick)` (another somewhat silly thing to do, but no different than `external->ban (via /ban)`)

The state table considered the first as illegal, which is untrue.

* Changelog

* Make the graph prettier

* Update changelogs/client_server/newsfragments/3730.clarification

Co-authored-by: Richard van der Hoff <1389908+richvdh@users.noreply.github.com>

Co-authored-by: Richard van der Hoff <1389908+richvdh@users.noreply.github.com>
pull/1054/head
Travis Ralston 3 years ago committed by Travis Ralston
parent b6f2b172a6
commit fd2340a4da
4 changed files with 10 additions and 9 deletions
Show Stats Download Patch File Download Diff File

1
changelogs/client_server/newsfragments/3730.clarification
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@ -0,0 +1 @@
Fix membership state transitions to denote that `invite->knock` and `external->leave` are valid transitions.

16
data/event-schemas/schema/m.room.member.yaml
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@ -31,13 +31,13 @@ description: |-
from the `prev_content` object on an event. If not present, the user's previous membership must be assumed
as `leave`.
| | to `invite` | to `join` | to `leave` | to `ban` | to `knock` |
|-------------------|----------------------|----------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------|-----------------------------|--------------------|
| **from `invite`** | No change. | User joined the room. | If the `state_key` is the same as the `sender`, the user rejected the invite. Otherwise, the `state_key` user had their invite revoked. | User was banned. | Must never happen. |
| **from `join`** | Must never happen. | `displayname` or `avatar_url` changed. | If the `state_key` is the same as the `sender`, the user left. Otherwise, the `state_key` user was kicked. | User was kicked and banned. | Must never happen. |
| **from `leave`** | New invitation sent. | User joined. | No change. | User was banned. | User is knocking. |
| **from `ban`** | Must never happen. | Must never happen. | User was unbanned. | No change. | Must never happen. |
| **from `knock`** | Knock accepted. | Must never happen. | If the `state_key` is the same as the `sender`, the user retracted the knock. Otherwise, the `state_key` user had their knock denied. | User was banned. | No change. |
| | to `invite` | to `join` | to `leave` | to `ban` | to `knock` |
|-------------------|----------------------|----------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------|-----------------------------|----------------------|
| **from `invite`** | No change. | User joined the room. | If the `state_key` is the same as the `sender`, the user rejected the invite. Otherwise, the `state_key` user had their invite revoked. | User was banned. | User is re-knocking. |
| **from `join`** | Must never happen. | `displayname` or `avatar_url` changed. | If the `state_key` is the same as the `sender`, the user left. Otherwise, the `state_key` user was kicked. | User was kicked and banned. | Must never happen. |
| **from `leave`** | New invitation sent. | User joined. | No change. | User was banned. | User is knocking. |
| **from `ban`** | Must never happen. | Must never happen. | User was unbanned. | No change. | Must never happen. |
| **from `knock`** | Knock accepted. | Must never happen. | If the `state_key` is the same as the `sender`, the user retracted the knock. Otherwise, the `state_key` user had their knock denied. | User was banned. | No change. |
properties:
content:
@ -72,7 +72,7 @@ properties:
Client and server implementations should be aware of the [signing implications](/rooms/v8/#authorization-rules) of including this
field in further events: in particular, the event must be signed by the server which
owns the user ID in the field. When copying the membership event's `content`
owns the user ID in the field. When copying the membership event's `content`
(for profile updates and similar) it is therefore encouraged to exclude this
field in the copy, as otherwise the event might fail event authorization.
reason:

2
static/diagrams/membership.drawio
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