# Copyright 2019 New Vector Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
type: object
title: Persistent Data Unit
description: A persistent data unit (event) for room version 3 and beyond.
example:
  $ref: "../examples/pdu_v3.json"
allOf:
  - $ref: "unsigned_pdu_base.yaml"
  - type: object
    properties:
      redacts:
        type: string
        description: For redaction events, the ID of the event being redacted.
        example: "$def/456+oldevent"
      auth_events:
        type: array
        items:
          type: string
          description: Event ID.
        description: |-
          Event IDs for the authorization events that would
          allow this event to be in the room.

          Must contain less than or equal to 10 events. Note that if the relevant
          auth event selection rules are used, this restriction should never be
          encountered.
        example: ["$base64EncodedHash", "$AnotherEvent"]
      prev_events:
        type: array
        items:
          type: string
          description: Event ID.
        description: |-
          Event IDs for the most recent events in the room
          that the homeserver was aware of when it made this event.

          Must contain less than or equal to 20 events.
        example: ["$base64EncodedHash", "$AnotherEvent"]
      hashes:
        $ref: "event_hash.yaml"
      signatures:
        type: object
        description: |-
          Signatures for the PDU, following the algorithm specified in [Signing Events](/server-server-api/#signing-events).
        example: {
          "example.com": {
            "ed25519:key_version:": "86BytesOfSignatureOfTheRedactedEvent"
          }
        }
        additionalProperties:
          type: object
          title: Server Signatures
          additionalProperties:
            type: string
    required:
      - auth_events
      - prev_events
      - hashes
      - signatures