Json Schema validate reference property on same object - json

Question

Using JSON Schema 7 to perform validations
Is the below validation possible using json schema.
{
properties : [{name: "a"}, {name: "b"}, {name: "c"}],
rules : [{ prop : ["a","b"] }, { prop : ["a"] }, {prop: ["c"]}]
}
The "prop" property in object is dependent values in properties.
ie only of "properties.name" exists then that value can be added to the "prop" array
Note:
The "properties" array can have any object of type {name : }
"name" can have any possible string, which i don't know beforehand
I have been going through documentation, but can find a answer.
Is this validation not supported in Json Schema yet?

Answer 1

You can't do it with a static JSON schema.
To archive it you would need a dynamic schema validation, but this could be dangerous to code injection from malicious users:
const Ajv = require('ajv')
const ajv = new Ajv({ allErrors: true, jsonPointers: true })
const data = {
properties: [{ name: 'a' }, { name: 'b' }, { name: 'c' }],
rules: [{ prop: ['a', 'b'] }, { prop: ['a', 'zz'] }, { prop: ['c'] }]
}
const validProp = data.properties.map(_ => _.name)
const schema = {
type: 'object',
required: ['properties', 'rules'],
properties: {
properties: {
type: 'array',
items: {
type: 'object',
required: ['name'],
properties: {
name: { type: 'string' }
}
}
},
rules: {
type: 'array',
items: {
type: 'object',
required: ['prop'],
properties: {
prop: {
type: 'array',
uniqueItems: true,
items: {
type: 'string',
enum: validProp // here happen the validation
}
}
}
}
}
}
}
const isValid = ajv.validate(schema, data)
if (!isValid) {
console.log(ajv.errors)
}