<@U4H0M349G> Is it possible to add the `OpenApiExt...

# http4k

[Elizabeth Thomas]

@dave Is it possible to add the OpenApiExtension for the paths in OpenApi spec through http4k-contract? My scenario is that I want to be able to add a custom attribute with a value to every path in my OpenApi Spec. I was able to add a custom attribute block using OpenApiExtension to the extensions field in OpenApi3. But I am not sure how to do it for each of my path object

apiBaseUrl bind contract {
      renderer = OpenApi3(
        ApiInfo(apiName, apiVersion, apiName),
        WdsHttpJackson,
        listOf(XApiDefinitionExtension),
        OpenApi3ApiRenderer(WdsHttpJackson)
      )
      descriptionPath = swaggerJsonPath
      routes += contractRoutes
    }

[Elizabeth Thomas]

I want my rendered OpenAPI Spec to have the paths object something like this

...
"paths": {
  "/abc": {
    "x-custom-classification": "INTERNAL",
    "get": {
       ...
     }
  },
  "/def": {
    "x-custom-classification": "PUBLIC",
    "get": {
       ...
     }
  }
}
...

[Elizabeth Thomas]

Is there a way for me to inject x-custom-classification attribute to the open api spec for every path using OpenApiExtensions?

[Elizabeth Thomas]

I am seeing that the Path Item Object in OpenAPI3 Spec MAY be extended with OpenAPI Extensions

[dave]

yes - the extensions each receive access to the entire document structure. you can do whatever you like with them.. 🙂

[Elizabeth Thomas]

So when I am defining my route, how do I inject the extension or create a route that extends from the extension?

"/echo" meta {
        summary = "echoes the name and message sent to it"
        receiving(body to NameAndMessage("jim", "hello!"))
        returning(OK, body to NameAndMessage("jim", "hello!"))
    } bindContract POST to { request: Request ->
        val received: NameAndMessage = body(request)
        Response(OK).with(body of received)
    }

[Elizabeth Thomas]

Do you have any example?

[dave]

you can't inject an extension into the routes currrently. you have to inject them into the OpenApi renderer

[dave]

and they operate on the entire node structure of the document

[dave]

the example is in the tests. Look at OpenApi3Test and you can see AddSimpleFieldToRootNode . The output can be seen at http4k-contract/src/test/resources/org/http4k/contract/openapi/v3/OpenApi3AutoTest.renders as expected.approved

[Elizabeth Thomas]

Thank you @dave - taking a look!

[Elizabeth Thomas]

So my example also followed a similar pattern and I was able to see a custom block of object getting added at the root of the node. Do I have to add some conditionals in the extension class if I need the custom block to be added only at certain path levels?

[dave]

yes, you need to implement the entire logic piece to navigate to where you need it

[Elizabeth Thomas]

Oh my, I thought it would be easy 🙂 Now I will have to debug and add the conditionals for the JSON Node