Can I add specification extensions to my schema?

ServiceStack Open API
1

The spec allows x- prefixed extensions to the schema objects - sometimes called vendor extensions. I have been using the ApiDeclarationFilter to modify the JSON as needed but I’ve started looking at using ReDoc and noticed that since the .net objects are simple classes, I can’t add properties on the fly. Do you have have recommendations on how I can accomplish this?

Thanks!

2

That’s a question for ReDoc, do they support it?

3

Sorry, I probably wasn’t specific enough/very clear in what I was asking. ReDoc has a set of vendor extensions to the open api 2.0 spec. For example they have a property in the info JSON which is x-logo. Is there a way I can add this to the JSON returned from the ~/openapi endpoint?

For example:

{
  "info": {
    "version": "1.0.0",
    "title": "Swagger Petstore",
    "x-logo": {
      "url": "https://rebilly.github.io/ReDoc/petstore-logo.png",
      "backgroundColor": "#FFFFFF"
    }
  }
}

I can’t just add the property in the ApiDeclarationFilter because I can’t add the property to the OpenApiInfo class without creating a custom build. There are other extensions listed here if that helps clarify: https://github.com/Rebilly/ReDoc/blob/master/docs/redoc-vendor-extensions.md

Edit - I’m not asking for added support - I’m looking for whether I can manipulate the openapi response outside of the rigid class structure used in the plug-in, more something like a Json Object before it’s returned to the caller.

4

No, the typed DTOs are what’s serialized to generate the Open API JSON specification. You would need to capture the generated output and manually modify the JSON out-of-band to add the vendor extensions.

5

In case this is helpful to anyone else - I came up with a work around by exposing the extended schema for ReDoc as a separate endpoint and calling the open api service within that endpoint. I.e.

        public HttpResult Get(ReDocReq req)
        {
            using (var service = base.ResolveService<OpenApiService>())
            {
                var resp = service.Get(new OpenApiSpecification());
                var res = resp as HttpResult;
                var oApiObj = res?.Response as OpenApiDeclaration;

                var json = JsonObject.Parse(oApiObj.ToJson());

                ... add vendor extensions  ...
                
                return new HttpResult(json, "application/json");
            }
            
        }

Thanks!

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