org.http4k.lens.cloudEventsExtensions.kt Maven / Gradle / Ivy

Go to download
package org.http4k.lens

import io.cloudevents.CloudEvent
import io.cloudevents.CloudEventData
import io.cloudevents.rw.CloudEventDataMapper
import org.http4k.core.Body
import org.http4k.core.CLOUD_EVENT_JSON
import org.http4k.core.ContentType
import org.http4k.lens.ParamMeta.ObjectParam

/**
 * Lens to get/set a cloud event into an HttpMessage
 */
fun Body.Companion.cloudEvent(contentType: ContentType = ContentType.CLOUD_EVENT_JSON) = BiDiBodyLensSpec(
    listOf(Meta(true, "body", ObjectParam, "Cloud Event", "Cloud Event", emptyMap())),
    contentType,
    LensGet { _, target -> listOf(target.toCloudEventReader().toEvent()) },
    LensSet { _, values, target ->
        values.fold(target) { memo, next ->
            memo.header("content-type", contentType.toHeaderValue()).write(next)
        }
    }
)

object CloudEvent {
    fun  data(mapper: CloudEventDataMapper): Lens =
        object : LensSpec(
            "Cloud Event",
            ObjectParam,
            LensGet { _, target -> target.data?.let { listOf(mapper.map(it)) }.orEmpty() }
        ) {}.required("data")
}