[Question] Custom format validator with constraints

[sitepark-veltrup]

I would like to transfer form data in JSON. The file uploads should be specified in the Data URI schema. My JSON schema looks like this.

{
  "type" : "object",
  "properties" : {
    "upload" : {
      "type" : "string",
      "format" : "data-uri"
    }
  }
}

Here I can create my own validator via Custom Formats, which checks the format.

However, I would like to go even further and also have the validator check a maximum file size, for example, and could extend my schema for this:

{
  "type" : "object",
  "properties" : {
    "upload" : {
      "type" : "string",
      "format" : "data-uri",
      "maxFileSize" : 100000
    }
  }
}

My problem is that only the string is passed to the format validator, but I can't get to the schema and read out maxFileSize.

I have another case where I want to limit HTML to certain elements.

{
  "type" : "object",
  "properties" : {
    "text" : {
      "type" : "string",
      "format" : "html",
      "allowedElements" : ["p", "strong", "em","li", "ul", "ol"]
    }
  }
}

Is there any other way I could solve this? Or would it perhaps be a useful extension to provide the validator with the schema as well?

[sorinsarca]

In this case you should use filters.

https://opis.io/json-schema/2.x/filters.html

https://opis.io/json-schema/2.x/php-filter.html