{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://git.eeqj.de/sneak/chat/schema/s2s/ping.json",
  "title": "S2S Ping",
  "description": "Inter-server keepalive.",
  "type": "object",
  "properties": {
    "id": {
      "type": "string",
      "format": "uuid"
    },
    "type": {
      "const": "ping"
    },
    "ts": {
      "type": "string",
      "format": "date-time"
    },
    "origin": {
      "type": "string",
      "description": "Pinging server."
    },
    "token": {
      "type": "string",
      "description": "Opaque token to be echoed in pong."
    }
  },
  "required": ["id", "type", "ts", "origin"]
}