{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://git.eeqj.de/sneak/chat/schema/s2c/message.json",
  "title": "S2C Message",
  "description": "A channel message delivered via the unified message stream.",
  "type": "object",
  "properties": {
    "id": {
      "type": "integer",
      "description": "Server-assigned message ID, monotonically increasing."
    },
    "type": {
      "const": "message"
    },
    "ts": {
      "type": "string",
      "format": "date-time",
      "description": "Server-assigned timestamp (ISO 8601)."
    },
    "from": {
      "type": "string",
      "description": "Sender nick."
    },
    "channel": {
      "type": "string",
      "description": "Channel the message was sent to.",
      "pattern": "^#[a-zA-Z0-9_-]+$"
    },
    "content": {
      "type": "string",
      "description": "Message body."
    },
    "meta": {
      "type": "object",
      "description": "Extensible metadata (signatures, rich content, etc.).",
      "additionalProperties": true
    }
  },
  "required": ["id", "type", "ts", "from", "channel", "content"]
}