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/*
* ============LICENSE_START=======================================================
* dcaegen2-collectors-veshv
* ================================================================================
* Copyright (C) 2019 NOKIA
* ================================================================================
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* ============LICENSE_END=========================================================
*/
package org.onap.dcae.collectors.veshv.impl
import arrow.core.Option
import arrow.core.Try
import arrow.syntax.collections.firstOption
import io.netty.handler.ssl.SslHandler
import io.netty.util.concurrent.Future
import org.onap.dcae.collectors.veshv.domain.logging.ClientContext
import reactor.core.publisher.Mono
import reactor.netty.ByteBufFlux
import reactor.netty.Connection
import reactor.netty.NettyInbound
import reactor.netty.NettyOutbound
import java.net.InetAddress
import java.security.cert.X509Certificate
import javax.net.ssl.SSLSession
internal fun InetAddress.isLocalClientAddress() = hostAddress == "127.0.0.1" || hostName == "localhost"
internal fun Connection.getSslSession(): Option<SSLSession> =
Option.fromNullable(
channel()
.pipeline()
.get(SslHandler::class.java)
?.engine()
?.session
)
internal fun SSLSession.findClientCert(): Option<X509Certificate> =
peerCertificates
.firstOption()
.flatMap { Option.fromNullable(it as? X509Certificate) }
internal fun withConnectionFrom(nettyInboud: NettyInbound, task: (Connection) -> Unit) =
nettyInboud.withConnection(task)
internal fun Connection.closeChannel() = channel().close()
internal fun Connection.closeChannelAndThen(task: (Future<in Void>) -> Unit) =
closeChannel().addListener { task(it) }
internal fun <T> NettyInbound.closeConnectionAndReturn(returnValue: T): T =
withConnectionFrom(this) { it.closeChannel() }.let { returnValue }
internal fun NettyInbound.createDataStream(): ByteBufFlux = receive().retain()
//
// ClientContext related
//
internal inline fun withNewClientContextFrom(nettyInbound: NettyInbound,
nettyOutbound: NettyOutbound,
reactiveTask: (ClientContext) -> Mono<Void>) =
ClientContext(nettyOutbound.alloc())
.also { populateClientContextFromInbound(it, nettyInbound) }
.run(reactiveTask)
internal fun populateClientContextFromInbound(clientContext: ClientContext, nettyInbound: NettyInbound) =
withConnectionFrom(nettyInbound) { connection ->
clientContext.clientAddress = Try { connection.address().address }.toOption()
clientContext.clientCert = connection.getSslSession().flatMap { it.findClientCert() }
}
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