{
    "$schema": "http://json-schema.org/draft-04/schema#",
    "id": "https://choria.io/schemas/choria/protocol/v1/transport.json",
    "description": "Choria Transport version 1",
    "title": "TransportV1",
    "type":"object",
    "required":[
        "protocol",
        "data",
        "headers"
    ],
    "properties": {
        "protocol": {
            "type":"string",
            "enum": [
                "choria:transport:1"
            ]
        },
        "data": {
            "type":"string",
            "description": "Base64 encoded JSON representation of the SecureRequestV1 or SecureReplyV1"
        },
        "headers": {
            "type":"object",
            "properties": {
                "reply-to": {
                    "type":"string",
                    "description": "NATS destination where replies should be sent if this is a request",
                    "minLength": 1
                },
                "mc_sender": {
                    "type":"string",
                    "description": "The configured identity of the sender",
                    "minLength": 1
                },
                "seen-by": {
                    "type":"array",
                    "description": "Tracks nodes this message travelled through",
                    "items": [
                        {
                            "type":"array",
                            "description": "Triplet of from, via and to",
                            "items": [
                                {
                                    "type":"string",
                                    "description": "The incoming end point - typically a NATS server name. Blank string if this is where a message starts like a request"
                                },
                                {
                                    "type":"string",
                                    "description": "The processing node - the identity of a server, client or broker processing this message"
                                },
                                {
                                    "type":"string",
                                    "description": "The outgoing end point - typically a NATS server name. Blank string if this is where the message ends like a client receiving a reply"
                                }
                            ]
                        }
                    ]
                },
                "federation": {
                    "description": "Optional headers set to support Federation.",
                    "type":"object",
                    "required":[
                        "req"
                    ],
                    "properties": {
                        "req": {
                            "type":"string",
                            "description": "The request ID of the contained Secure Request or Secure Reply.  Used for logging mainly",
                            "minLength": 32,
                            "maxLength": 32
                        },
                        "reply-to": {
                            "type":"string",
                            "description": "Used by Federation to record the original reply-to header",
                            "minLength": 1
                        },
                        "targets": {
                            "type":"array",
                            "description": "List of targets the message should be sent to, these are mcollective identities",
                            "items": {
                                "type":"string",
                                "description": "Node identities this message should be dispatched to"
                            }
                        }
                    }
                }
            }
        }
    }
}