"format" should accept any value

[yohanboniface]

Hi,

According to the spec, "format" should accept any value:

However, to support documentation needs, the format property is an open string-valued property, and can have any value. Formats such as "email", "uuid", and so on, MAY be used even though undefined by this specification. Types that are not accompanied by a format property follow the type definition in the JSON Schema. Tools that do not recognize a specific format MAY default back to the type alone, as if the format is not specified.

However, this will raise: ValueError: 'custom' is not a valid SchemaFormat

from openapi_core import create_spec


schema = {
    "components": {
        "schemas": {
            "Foo": {
                "type": "object",
                "properties": {
                    "propname": {
                        "type": "string",
                        "format": "custom"
                    }
                }
            }
        }
    },
    "info": {
        "title": "xxx",
        "version": "1.0.0"
    },
    "openapi": "3.0.0",
    "paths": {
        "/simulate": {
            "get": {
                "responses": {
                    "200": {
                        "content": {
                            "application/json": {
                                "schema": {
                                    "$ref": "#/components/schemas/Foo"
                                }
                            }
                        },
                        "description": "OK"
                    }
                }
            }
        }
    }
}


spec = create_spec(schema)

Am I missing something?

Thanks! :)

[p1c2u]

@yohanboniface Yup, you're right. Thanks for the report.

[yohanboniface]

Thanks!