org.http4k.contract.JsonErrorResponseRenderer.kt Maven / Gradle / Ivy

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http4k typesafe HTTP contracts and OpenApi support

There is a newer version: 5.31.0.0

package org.http4k.contract

import org.http4k.core.ContentType
import org.http4k.core.Response
import org.http4k.core.Status
import org.http4k.core.with
import org.http4k.format.Json
import org.http4k.lens.Header
import org.http4k.lens.LensFailure
import org.http4k.lens.ParamMeta.ArrayParam

class JsonErrorResponseRenderer(private val json: Json) : ErrorResponseRenderer {
    override fun badRequest(lensFailure: LensFailure) =
        Response(Status.BAD_REQUEST)
            .with(Header.CONTENT_TYPE of ContentType.APPLICATION_JSON)
            .body(
                json {
                    compact(
                        obj("message" to string("Missing/invalid parameters"),
                            "params" to array(lensFailure.failures.map {
                                val paramMeta = it.meta.paramMeta
                                obj(
                                    "name" to string(it.meta.name),
                                    "type" to string(it.meta.location),
                                    "datatype" to string(
                                        if (paramMeta is ArrayParam) "[${paramMeta.itemType().description}]"
                                        else paramMeta.description
                                    ),
                                    "required" to boolean(it.meta.required),
                                    "reason" to string(it.javaClass.simpleName)
                                )
                            })
                        )
                    )
                })

    override fun notFound(): Response = Response(Status.NOT_FOUND)
        .body(json {
            compact(
                obj("message" to string("No route found on this path. Have you used the correct HTTP verb?"))
            )
        })
}