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130 lines
3.5 KiB
Markdown
130 lines
3.5 KiB
Markdown
---
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title: Room Version 8
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type: docs
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weight: 80
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---
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This room version builds on [version 7](/rooms/v7) to introduce a new
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join rule that allows members to join the room based on membership in
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another room.
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{{% boxes/warning %}}
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This room version is known to have issues relating to redactions of member
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join events. [Room version 9](/rooms/v9) should be preferred over v8 when
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creating rooms.
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{{% /boxes/warning %}}
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## Client considerations
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Clients are encouraged to expose the option for the join rule in their
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user interface for supported room versions.
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The new join rule, `restricted`, is described in the
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[Client-Server API](/client-server-api/#restricted-rooms).
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Clients which implement the redaction algorithm locally should refer to the
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[redactions](#redactions) section below for a full overview.
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### Redactions
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{{% added-in this=true %}} `m.room.join_rules` events now keep `allow` in addition to other
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keys in `content` when being redacted.
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{{% boxes/warning %}}
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[Room version 9](/rooms/v9) adds additional cases of protected properties for behaviour
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related to restricted rooms (the functionality introduced in v8). v9 is preferred over
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v8 when creating new rooms.
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{{% /boxes/warning %}}
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The full redaction algorithm follows.
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Upon receipt of a redaction event, the server must strip off any keys
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not in the following list:
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- `event_id`
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- `type`
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- `room_id`
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- `sender`
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- `state_key`
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- `content`
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- `hashes`
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- `signatures`
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- `depth`
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- `prev_events`
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- `prev_state`
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- `auth_events`
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- `origin`
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- `origin_server_ts`
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- `membership`
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The content object must also be stripped of all keys, unless it is one
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of one of the following event types:
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- `m.room.member` allows key `membership`.
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- `m.room.create` allows key `creator`.
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- `m.room.join_rules` allows keys `join_rule`, `allow`.
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- `m.room.power_levels` allows keys `ban`, `events`, `events_default`,
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`kick`, `redact`, `state_default`, `users`, `users_default`.
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- `m.room.history_visibility` allows key `history_visibility`.
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## Server implementation components
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{{% boxes/warning %}}
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The information contained in this section is strictly for server
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implementors. Applications which use the Client-Server API are generally
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unaffected by the intricacies contained here. The section above
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regarding client considerations is the resource that Client-Server API
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use cases should reference.
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{{% /boxes/warning %}}
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Room version 8 adds a new join rule to allow members of a room to join another
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room without invite. Otherwise, the room version inherits all properties of
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[Room version 7](/rooms/v7).
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### Authorization rules
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{{< added-in this=true >}} For checks performed upon `m.room.member` events, new
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points for handling `content.join_authorised_via_users_server` are added (Rule 4.2
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and 4.3.5).
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{{< rver-fragment name="v8-auth-rules" withVersioning=true >}}
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### Redactions
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[See above](#redactions).
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## Unchanged from v7
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The following sections have not been modified since v7, but are included for
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completeness.
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### Handling redactions
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{{% rver-fragment name="v3-handling-redactions" %}}
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### Event IDs
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{{% rver-fragment name="v4-event-ids" %}}
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### Event format
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{{% rver-fragment name="v4-event-format" %}}
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#### Deprecated event content schemas
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{{% rver-fragment name="v1-deprecated-formatting-off-spec" %}}
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{{% rver-fragment name="v1-stringy-power-levels" %}}
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### State resolution
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{{% rver-fragment name="v2-state-res" %}}
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### Canonical JSON
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{{% rver-fragment name="v6-canonical-json" %}}
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### Signing key validity period
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{{% rver-fragment name="v5-signing-requirements" %}}
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