{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://schemas.apievangelist.com/amazon-iot-core/thing-definition",
  "title": "Amazon IoT Core Thing Definition",
  "description": "Schema defining the structure of an Amazon IoT Core thing resource, including attributes, thing type, thing group membership, certificates, and shadow state.",
  "type": "object",
  "required": [
    "thingName"
  ],
  "properties": {
    "thingName": {
      "type": "string",
      "description": "The name of the thing.",
      "minLength": 1,
      "maxLength": 128,
      "pattern": "^[a-zA-Z0-9:_-]+$"
    },
    "thingId": {
      "type": "string",
      "description": "The unique identifier of the thing."
    },
    "thingArn": {
      "type": "string",
      "description": "The ARN of the thing."
    },
    "thingTypeName": {
      "type": "string",
      "description": "The name of the thing type, if assigned."
    },
    "attributes": {
      "type": "object",
      "additionalProperties": {
        "type": "string"
      },
      "description": "A list of thing attributes as name-value pairs."
    },
    "version": {
      "type": "integer",
      "description": "The current version of the thing record."
    },
    "billingGroupName": {
      "type": "string",
      "description": "The name of the billing group the thing belongs to."
    },
    "defaultClientId": {
      "type": "string",
      "description": "The default MQTT client ID."
    },
    "shadow": {
      "$ref": "#/$defs/Shadow"
    },
    "certificates": {
      "type": "array",
      "items": {
        "$ref": "#/$defs/Certificate"
      },
      "description": "Certificates attached to the thing."
    },
    "policies": {
      "type": "array",
      "items": {
        "$ref": "#/$defs/Policy"
      },
      "description": "Policies attached to the thing's certificates."
    },
    "thingGroups": {
      "type": "array",
      "items": {
        "type": "string"
      },
      "description": "The thing groups the thing belongs to."
    }
  },
  "$defs": {
    "Shadow": {
      "type": "object",
      "description": "The device shadow state for the thing.",
      "properties": {
        "state": {
          "type": "object",
          "properties": {
            "desired": {
              "type": "object",
              "additionalProperties": true,
              "description": "The desired state of the thing."
            },
            "reported": {
              "type": "object",
              "additionalProperties": true,
              "description": "The reported state of the thing."
            },
            "delta": {
              "type": "object",
              "additionalProperties": true,
              "description": "The difference between desired and reported state."
            }
          }
        },
        "metadata": {
          "type": "object",
          "description": "Metadata about the shadow state."
        },
        "version": {
          "type": "integer",
          "description": "The shadow version."
        },
        "timestamp": {
          "type": "integer",
          "description": "The shadow timestamp."
        }
      }
    },
    "Certificate": {
      "type": "object",
      "description": "An X.509 certificate for device authentication.",
      "properties": {
        "certificateId": {
          "type": "string",
          "description": "The unique identifier of the certificate."
        },
        "certificateArn": {
          "type": "string",
          "description": "The ARN of the certificate."
        },
        "status": {
          "type": "string",
          "enum": [
            "ACTIVE",
            "INACTIVE",
            "REVOKED",
            "PENDING_TRANSFER",
            "REGISTER_INACTIVE",
            "PENDING_ACTIVATION"
          ],
          "description": "The status of the certificate."
        },
        "creationDate": {
          "type": "string",
          "format": "date-time",
          "description": "The date the certificate was created."
        }
      }
    },
    "Policy": {
      "type": "object",
      "description": "An IoT policy that defines allowed operations.",
      "properties": {
        "policyName": {
          "type": "string",
          "description": "The name of the policy."
        },
        "policyArn": {
          "type": "string",
          "description": "The ARN of the policy."
        },
        "policyDocument": {
          "type": "string",
          "description": "The JSON document that describes the policy."
        },
        "defaultVersionId": {
          "type": "string",
          "description": "The default version of the policy."
        }
      }
    }
  }
}