JSON schema validation with Map of string with Enum constraints - json

Question

Requesting help with JSON Schema validation, below is sample JSON and Schema. I am trying to figure out how to specify "ppd" schema rule specifically "cfg" is a map of String, String and need to further restrict the entries of the key and value in this map by Enum definition i.e. allowed values for "inputDateTimeFormat" is a valid date time format so rule should encode if key is "inputDateTimeFormat" then allowed value is a pattern matching date time format and similarly if key is "valuemapping" then allowed values is pattern matching k=v (example below).
Could you please suggest a way to achieve this?
JSON Sample -
{
"sm": [
{
"mid": "id-1",
"ppd": [
{
"name": "cc-1",
"cfg": {
"columns": "v-1",
"valueMapping": "B=01;S=02"
}
},
{
"name": "cc-2",
"cfg": {
"columns": "v-2",
"inputDateTimeFormat": "ddMMMyyyy_HH:mm:ss.SSSSSS",
"outputDateTimeFormat": "yyyy-MM-dd'T'HH:mm:Ss.SSSZ"
}
},
{
"name": "cc-3",
"cfg": {
"columns": "v-3;v-4",
"markers": "d=01"
}
}
]
}
]
}
JSON Schema :
{
"type": "object",
"$schema": "http://json-schema.org/draft-06/schema",
"id": "source-mappings-schema",
"required": true,
"properties": {
"sm": {
"type": "array",
"id": "source-mappings-schema/sm",
"required": true,
"items": {
"type": "object",
"id": "source-mappings-schema/sm/0",
"required": true,
"properties": {
"mappingId": {
"type": "string",
"id": "source-mappings-schema/sm/0/mappingId",
"required": true
},
"ppd": {
"type": "array",
"id": "source-mappings-schema/sm/0/ppd",
"required": true,
"items": {
"type": "object",
"id": "source-mappings-schema/sm/0/ppd/0",
"required": true,
"properties": {
"name": {
"type": "string",
"id": "source-mappings-schema/sm/0/ppd/0/name",
"required": true
},
"cfg": {
"type": "array",
"id": "source-mappings-schema/sm/0/ppd/0/cfg",
"required": true,
"items": {
"type": "string"
}
}
}
}
}
}
}
}
}
}

Answer 1

To start with your schema contains a few issue.
The $schema tag is wrong, it should be
"$schema": "http://json-schema.org/draft-06/schema#",
The 'required' property is supposed to be an array of property names that are required (not a bool), so you need to apply this at the level above.
Finally the validation of cfg. By specifying a schema for 'additionalProperties' you can provide validation rules for all unspecified key values (you said it was a map of strings, so I've set it to string, but you could also add other rules here like max length etc).
For the keys you know about you can add a property for each of them with the approrate validation rules (the rules i've added demonstrate the concept and will need tweaking for your use).
"cfg": {
"type": "object",
"additionalProperties": {
"type": "string"
},
"properties": {
"inputDateTimeFormat": {
"type": "string",
"format": "date-time"
},
"valuemapping": {
"type": "string",
"pattern": "[a-z]\\=[a-z]"
}
}
}