How to prevent additions properties when using oneOf in JSON Schema - json

Question

I have a JSON configuration with an array of "specs", with many different kinds of "path" properties. The "kind" property is the selector of the variant.
I want to restrict the validation to not allow addition properties. In the JSON example, the properties "noAllowedInt" and "notAllowedObject" must report a validation error.
How can I add this rule to the JSON schema?
{
"specs": [
{
"id": 12,
"label": "Serial",
"path": {
"kind": "serial",
"speed": 9600,
"parity": "even"
}
},
{
"id": 13,
"label": "Memory",
"path": {
"kind": "memory",
"storage": "permanent",
"location": "external"
},
"noAllowedInt": 42,
"notAllowedObject": {
"value": 3.1415
}
}
]
}
There are two Json Schema to validate this, a simple one and one with "definitions"
Simple JSON Schema:
{
"$schema": "http://json-schema.org/draft-04/schema#",
"type": "object",
"additionalProperties": false,
"properties": {
"specs": {
"type": "array",
"items": {
"type": "object",
"additionalProperties": true,
"properties": {
"id": {
"type": "integer"
},
"label": {
"type": "string"
}
},
"required": [
"id",
"label"
],
"oneOf": [
{
"type": "object",
"properties": {
"path": {
"type": "object",
"additionalProperties": false,
"properties": {
"kind": {
"type": "string",
"enum": [
"serial"
]
},
"speed": {
"type": "integer"
},
"parity": {
"type": "string"
}
},
"required": [
"kind"
]
}
}
},
{
"type": "object",
"properties": {
"path": {
"type": "object",
"additionalProperties": false,
"properties": {
"kind": {
"type": "string",
"enum": [
"memory"
]
},
"storage": {
"type": "string"
},
"location": {
"type": "string"
}
},
"required": [
"kind"
]
}
}
}
]
}
}
},
"required": [
"specs"
]
}
JSON Schema with "definitions"
{
"$schema": "http://json-schema.org/draft-04/schema#",
"type": "object",
"additionalProperties": false,
"properties": {
"specs": {
"type": "array",
"items": {
"type": "object",
"additionalProperties": true,
"properties": {
"id": {
"type": "integer"
},
"label": {
"type": "string"
}
},
"required": [
"id",
"label"
],
"oneOf": [
{
"$ref": "#/definitions/PathKindSerialType"
},
{
"$ref": "#/definitions/PathKindMemory"
}
]
}
}
},
"required": [
"specs"
],
"definitions": {
"PathKindSerialType": {
"type": "object",
"additionalProperties": true,
"properties": {
"path": {
"type": "object",
"additionalProperties": false,
"properties": {
"kind": {
"type": "string",
"enum": [
"serial"
]
},
"speed": {
"type": "integer"
},
"parity": {
"type": "string"
}
},
"required": [
"kind"
]
}
}
},
"PathKindMemory": {
"type": "object",
"additionalProperties": true,
"properties": {
"path": {
"type": "object",
"additionalProperties": false,
"properties": {
"kind": {
"type": "string",
"enum": [
"memory"
]
},
"storage": {
"type": "string"
},
"location": {
"type": "string"
}
},
"required": [
"kind"
]
}
}
}
}
}

Answer 1

I guess you need to keep the path definition as a property at the specs array level. This would be my proposal:
{
"$schema": "http://json-schema.org/draft-04/schema#",
"description": "JSON schema generated with JSONBuddy https://www.json-buddy.com",
"type": "object",
"additionalProperties": false,
"properties": {
"specs": {
"type": "array",
"items": {
"type": "object",
"additionalProperties": false,
"properties": {
"id": {
"type": "integer"
},
"label": {
"type": "string"
},
"path": {
"oneOf": [
{
"$ref": "#/definitions/PathKindSerialType"
},
{
"$ref": "#/definitions/PathKindMemory"
}
]
}
},
"required": [ "id", "label" ]
}
}
},
"required": [ "specs" ],
"definitions": {
"PathKindSerialType": {
"type": "object",
"additionalProperties": false,
"properties": {
"kind": {
"type": "string",
"enum": [ "serial" ]
},
"speed": {
"type": "integer"
},
"parity": {
"type": "string"
}
},
"required": [ "kind" ]
},
"PathKindMemory": {
"type": "object",
"additionalProperties": false,
"properties": {
"kind": {
"type": "string",
"enum": [ "memory" ]
},
"storage": {
"type": "string"
},
"location": {
"type": "string"
}
},
"required": [ "kind" ]
}
}
}