{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://git.eeqj.de/sneak/chat/schema/s2s/sync.json",
  "title": "S2S Sync",
  "description": "State synchronization between federated servers. Sent after link establishment to share channel and user state.",
  "type": "object",
  "properties": {
    "id": {
      "type": "string",
      "format": "uuid"
    },
    "type": {
      "const": "sync"
    },
    "ts": {
      "type": "string",
      "format": "date-time"
    },
    "origin": {
      "type": "string",
      "description": "Server sending the sync."
    },
    "channels": {
      "type": "array",
      "description": "Channels on the origin server.",
      "items": {
        "type": "object",
        "properties": {
          "name": {
            "type": "string",
            "pattern": "^#[a-zA-Z0-9_-]+$"
          },
          "topic": {
            "type": "string"
          },
          "modes": {
            "type": "string"
          },
          "members": {
            "type": "array",
            "items": {
              "type": "string"
            },
            "description": "List of nicks in the channel."
          }
        },
        "required": ["name"]
      }
    },
    "users": {
      "type": "array",
      "description": "Users on the origin server.",
      "items": {
        "type": "object",
        "properties": {
          "nick": {
            "type": "string"
          },
          "server": {
            "type": "string",
            "description": "Home server for this user."
          }
        },
        "required": ["nick"]
      }
    }
  },
  "required": ["id", "type", "ts", "origin"]
}