{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://meshcognition.org/spec/mmp/schema/handshake.schema.json",
  "title": "MMP v2.0 authenticated handshake frames",
  "oneOf": [
    { "$ref": "#/$defs/clientHello" },
    { "$ref": "#/$defs/serverHello" },
    { "$ref": "#/$defs/clientFinish" }
  ],
  "$defs": {
    "nodeOffer": {
      "type": "object",
      "required": [
        "protocolVersion", "room", "nodeId", "name", "identityPublicKey",
        "e2ePublicKey", "nonce", "implementation", "extensions"
      ],
      "properties": {
        "protocolVersion": { "const": "2.0" },
        "room": { "type": "string", "minLength": 1 },
        "nodeId": { "type": "string", "format": "uuid" },
        "name": { "type": "string", "minLength": 1 },
        "identityPublicKey": { "type": "string", "pattern": "^[A-Za-z0-9_-]{43}$" },
        "e2ePublicKey": { "type": "string", "pattern": "^[A-Za-z0-9_-]{43}$" },
        "nonce": { "type": "string", "pattern": "^[A-Za-z0-9_-]{43}$" },
        "implementation": {
          "type": "object",
          "required": ["name", "version"],
          "additionalProperties": false,
          "properties": {
            "name": { "type": "string", "minLength": 1 },
            "version": { "type": "string", "minLength": 1 }
          }
        },
        "extensions": {
          "type": "array",
          "uniqueItems": true,
          "items": { "type": "string", "pattern": "^[a-z0-9][a-z0-9._-]*$" }
        }
      }
    },
    "clientHello": {
      "allOf": [
        { "$ref": "#/$defs/nodeOffer" },
        {
          "type": "object",
          "required": ["type"],
          "additionalProperties": false,
          "properties": {
            "type": { "const": "client-hello" },
            "protocolVersion": true,
            "room": true,
            "nodeId": true,
            "name": true,
            "identityPublicKey": true,
            "e2ePublicKey": true,
            "nonce": true,
            "implementation": true,
            "extensions": true
          }
        }
      ]
    },
    "serverHello": {
      "allOf": [
        { "$ref": "#/$defs/nodeOffer" },
        {
          "type": "object",
          "required": ["type", "clientNonce", "selectedExtensions", "proof", "keyConfirmation"],
          "additionalProperties": false,
          "properties": {
            "type": { "const": "server-hello" },
            "protocolVersion": true,
            "room": true,
            "nodeId": true,
            "name": true,
            "identityPublicKey": true,
            "e2ePublicKey": true,
            "nonce": true,
            "implementation": true,
            "extensions": true,
            "clientNonce": { "type": "string", "pattern": "^[A-Za-z0-9_-]{43}$" },
            "selectedExtensions": {
              "type": "array",
              "uniqueItems": true,
              "items": { "type": "string", "pattern": "^[a-z0-9][a-z0-9._-]*$" }
            },
            "proof": { "type": "string", "pattern": "^[A-Za-z0-9_-]{86}$" },
            "keyConfirmation": { "type": "string", "pattern": "^[A-Za-z0-9_-]{43}$" }
          }
        }
      ]
    },
    "clientFinish": {
      "type": "object",
      "required": ["type", "transcriptHash", "proof", "keyConfirmation"],
      "additionalProperties": false,
      "properties": {
        "type": { "const": "client-finish" },
        "transcriptHash": { "type": "string", "pattern": "^[0-9a-f]{64}$" },
        "proof": { "type": "string", "pattern": "^[A-Za-z0-9_-]{86}$" },
        "keyConfirmation": { "type": "string", "pattern": "^[A-Za-z0-9_-]{43}$" }
      }
    }
  }
}