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/*
* Copyright © 2019 IBM.
*
* 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.
*/
package org.onap.ccsdk.cds.blueprintsprocessor.grpc.service
import io.grpc.CallOptions
import io.grpc.Channel
import io.grpc.ClientCall
import io.grpc.ClientInterceptor
import io.grpc.ForwardingClientCall
import io.grpc.ManagedChannel
import io.grpc.Metadata
import io.grpc.MethodDescriptor
import io.grpc.internal.DnsNameResolverProvider
import io.grpc.netty.NettyChannelBuilder
import org.onap.ccsdk.cds.blueprintsprocessor.grpc.TokenAuthGrpcClientProperties
import org.onap.ccsdk.cds.blueprintsprocessor.grpc.interceptor.GrpcClientLoggingInterceptor
class TokenAuthGrpcClientService(private val tokenAuthGrpcClientProperties: TokenAuthGrpcClientProperties) :
BlueprintGrpcClientService {
override suspend fun channel(): ManagedChannel {
val target =
if (tokenAuthGrpcClientProperties.port == -1) tokenAuthGrpcClientProperties.host
else "${tokenAuthGrpcClientProperties.host}:${tokenAuthGrpcClientProperties.port}"
val managedChannel = NettyChannelBuilder
.forTarget(target)
.nameResolverFactory(DnsNameResolverProvider())
.intercept(GrpcClientLoggingInterceptor())
.intercept(TokenAuthClientInterceptor(tokenAuthGrpcClientProperties)).usePlaintext().build()
return managedChannel
}
}
class TokenAuthClientInterceptor(private val tokenAuthGrpcClientProperties: TokenAuthGrpcClientProperties) :
ClientInterceptor {
override fun <ReqT, RespT> interceptCall(
method: MethodDescriptor<ReqT, RespT>,
callOptions: CallOptions,
channel: Channel
): ClientCall<ReqT, RespT> {
val authHeader = Metadata.Key.of("Authorization", Metadata.ASCII_STRING_MARSHALLER)
return object : ForwardingClientCall
.SimpleForwardingClientCall<ReqT, RespT>(channel.newCall(method, callOptions)) {
override fun start(responseListener: Listener<RespT>, headers: Metadata) {
headers.put(authHeader, tokenAuthGrpcClientProperties.token)
super.start(responseListener, headers)
}
}
}
}
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