So a few days ago, you said you'd suggest applying...

# http4k

[Sean Abbott]

So a few days ago, you said you'd suggest applying the correct filter to the correct route. Is that possible with a ContractRoute?

I have

fun partnerAccountTaskRoute(): ContractRoute {
    return spec to ::partnerAccountTaskHandler
}
fun partnerAccountTaskHandler(partnerAccountId: Long, task: String, taskType: String): HttpHandler = { request: Request ->
...
}
and
fun validTaskTypeFilter() = Filter { next ->
...
}

but I can't figure out how to compose the spec to ::function with the filter on it

[Sean Abbott]

I suppose I should expend that al the contract routes are getting added like

"/" bind contract {
        renderer = OpenApi3(ApiInfo("Thing API", "v1.0"), Jackson)

        // Return Swagger API definition under /swagger.json
        // This does not include the swagger UI, but apparently we could add it
        // <https://stackoverflow.com/questions/61729113/how-to-expose-swagger-ui-with-http4k>
        descriptionPath = "/swagger.json"

        // Add contract routes
        routes += ExampleContractRoute()
        routes += HealthRoute()
        routes += partnerAccountRoute()
        routes += partnerAccountTaskRoute()
    },

but right now I only want to put the filter on that last one; it's got a dynamic endpoing and I'd like to validate that endpoint with the filter, rather than as part of the handler.

[dave]

The bound route function returns an HttpHandler a you just need to.ensure the filter wraps that handler when it's "created"

[Sean Abbott]

Not sure if htis is ideal, but this works (in case other new folks happen to be lurking and curious)

fun partnerAccountTaskHandler(
    partnerAccountId: Long,
    task: String,
    taskType: String): HttpHandler = validTaskTypeFilter().then(){ request: Request ->
        filteredPartnerAccountTaskHandler(partnerAccountId, taskType, request)
}

[Sean Abbott]

(task is a static placeholder in the route, so it's not actually necessary to pass it into the function where the work happens)

[Sean Abbott]

Thank you again for the pointer! Took me awhile to grok the function composition element of this.