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87 lines
3.3 KiB
YAML
87 lines
3.3 KiB
YAML
---
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allOf:
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- $ref: core-event-schema/event.yaml
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description: |-
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This event type is used to indicate that the sender is not sharing room keys
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with the recipient. It is sent as a to-device event.
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Possible values for `code` include:
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* `m.blacklisted`: the user/device was blacklisted.
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* `m.unverified`: the user/device was not verified, and the sender is only
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sharing keys with verified users/devices.
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* `m.unauthorised`: the user/device is not allowed to have the key. For
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example, this could be sent in response to a key request if the user/device
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was not in the room when the original message was sent.
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* `m.unavailable`: sent in reply to a key request if the device that the
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key is requested from does not have the requested key.
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* `m.no_olm`: an olm session could not be established.
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In most cases, this event refers to a specific room key. The one exception to
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this is when the sender is unable to establish an olm session with the
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recipient. When this happens, multiple sessions will be affected. In order
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to avoid filling the recipient\'s device mailbox, the sender should only send
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one `m.room_key.withheld` message with no `room_id` nor `session_id`
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set. If the sender retries and fails to create an olm session again in the
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future, it should not send another `m.room_key.withheld` message with a
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`code` of `m.no_olm`, unless another olm session was previously
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established successfully. In response to receiving an
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`m.room_key.withheld` message with a `code` of `m.no_olm`, the
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recipient may start an olm session with the sender and send an `m.dummy`
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message to notify the sender of the new olm session. The recipient may
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assume that this `m.room_key.withheld` message applies to all encrypted
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room messages sent before it receives the message.
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properties:
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content:
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properties:
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algorithm:
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type: string
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enum: ["m.megolm.v1.aes-sha2"]
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description: |-
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The encryption algorithm for the key that this event is about.
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room_id:
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type: string
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description: |-
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Required if `code` is not `m.no_olm`. The room for the key that
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this event is about.
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session_id:
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type: string
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description: |-
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Required of `code` is not `m.no_olm`. The session ID of the key
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that this event is aboutis for.
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sender_key:
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type: string
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description: |-
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The unpadded base64-encoded device curve25519 key of the event\'s
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sender.
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code:
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type: string
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enum:
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- m.blacklisted
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- m.unverified
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- m.unauthorised
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- m.unavailable
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- m.no_olm
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description: |-
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A machine-readable code for why the key was not sent. Codes beginning
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with `m.` are reserved for codes defined in the Matrix
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specification. Custom codes must use the Java package naming
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convention.
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reason:
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type: string
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description: |-
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A human-readable reason for why the key was not sent. The receiving
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client should only use this string if it does not understand the
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`code`.
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required:
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- algorithm
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- sender_key
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- code
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type: object
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type:
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enum:
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- m.room_key.withheld
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type: string
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type: object
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