Json validation oneof validation-CodePudding

So I had this json

{
"f1":"John", 
"f2":"whatever",
"f3":"abc"
}

I wanted to validate it as only one of f1, f2, f3 should be present. If neither f1, f2 and f3 are present then it should pass.

Something like,

{
"f1":"John", 
}

PASS

{
"f1":"John", 
"f2":"whatever",
}

FAIL

{
"f1":"John", 
"f2":"whatever",
"f3":"abc"
}

FAIL

{}

PASS

Here is the code I wrote but it is failing

{
  "allOf": [
    {
      "if": {
        "required": [
          "f1"
        ]
      },
      "then": {
        "not": {
          "required": [
            "f2", "f3"
          ]
        }
      }
    },
    {
      "if": {
        "required": [
          "f3"
        ]
      },
      "then": {
        "not": {
          "required": [
            "f2", "f1"
          ]
        }
      }
    },
    {
      "if": {
        "required": [
          "f2"
        ]
      },
      "then": {
        "not": {
          "required": [
            "f3", "f1"
          ]
        }
      }
    }
  ]
}

EDIT: snippet of schema https://jsonschema.dev/s/eN6Db

CodePudding user response：

From your requirements as given, you don't need to check against the other properties as they are defined. A schema like this would be sufficient:

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "description": "JSON schema generated with JSONBuddy https://www.json-buddy.com",
  "properties": {
    "f1": {
      "type": "string"
    },
    "f2": {
      "type": "string"
    },
    "f3": {
      "type": "string"
    }
  },
  "minProperties": 0,
  "maxProperties": 1,
  "additionalProperties": false
}

However, this does not work if you also need other properties at this level.

CodePudding user response：

You have two options here. You can add else: false to each of your subschemas (demo) OR, remove the conditional checks and use oneOf. You'd have to also add a subschema to allow for empty objects. The second approach may be preferable.

Here's the schema and a demo.

{
  "oneOf": [
    {
      "additionalProperties": false
    },
    {
      "required": [
        "f1"
      ],
      "not": {
        "required": [
          "f2",
          "f3"
        ]
      }
    },
    {
      "required": [
        "f3"
      ],
      "not": {
        "required": [
          "f2",
          "f1"
        ]
      }
    },
    {
      "required": [
        "f2"
      ],
      "not": {
        "required": [
          "f3",
          "f1"
        ]
      }
    }
  ]
}