ms/blueprintsprocessor/modules/commons/grpc-lib/src/main/kotlin/org/onap/ccsdk/cds/blueprintsprocessor/grpc/service/TokenAuthGrpcClientService.kt

   1 /*
   2  *  Copyright © 2019 IBM.
   3  *
   4  *  Licensed under the Apache License, Version 2.0 (the "License");
   5  *  you may not use this file except in compliance with the License.
   6  *  You may obtain a copy of the License at
   7  *
   8  *      http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  *  Unless required by applicable law or agreed to in writing, software
  11  *  distributed under the License is distributed on an "AS IS" BASIS,
  12  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  *  See the License for the specific language governing permissions and
  14  *  limitations under the License.
  15  */
  16
  17 package org.onap.ccsdk.cds.blueprintsprocessor.grpc.service
  18
  19 import io.grpc.*
  20 import io.grpc.internal.DnsNameResolverProvider
  21 import io.grpc.internal.PickFirstLoadBalancerProvider
  22 import io.grpc.netty.NettyChannelBuilder
  23 import org.onap.ccsdk.cds.blueprintsprocessor.grpc.TokenAuthGrpcClientProperties
  24
  25 class TokenAuthGrpcClientService(private val tokenAuthGrpcClientProperties: TokenAuthGrpcClientProperties)
  26     : BluePrintGrpcClientService {
  27
  28     override suspend fun channel(): ManagedChannel {
  29         val managedChannel = NettyChannelBuilder
  30                 .forAddress(tokenAuthGrpcClientProperties.host, tokenAuthGrpcClientProperties.port)
  31                 .nameResolverFactory(DnsNameResolverProvider())
  32                 .loadBalancerFactory(PickFirstLoadBalancerProvider())
  33                 .intercept(TokenAuthClientInterceptor(tokenAuthGrpcClientProperties)).usePlaintext().build()
  34         return managedChannel
  35     }
  36 }
  37
  38 class TokenAuthClientInterceptor(private val tokenAuthGrpcClientProperties: TokenAuthGrpcClientProperties) : ClientInterceptor {
  39
  40     override fun <ReqT, RespT> interceptCall(method: MethodDescriptor<ReqT, RespT>,
  41                                              callOptions: CallOptions, channel: Channel): ClientCall<ReqT, RespT> {
  42
  43         val authHeader = Metadata.Key.of("Authorization", Metadata.ASCII_STRING_MARSHALLER)
  44
  45         return object : ForwardingClientCall
  46         .SimpleForwardingClientCall<ReqT, RespT>(channel.newCall(method, callOptions)) {
  47
  48             override fun start(responseListener: Listener<RespT>, headers: Metadata) {
  49                 headers.put(authHeader, tokenAuthGrpcClientProperties.token)
  50                 super.start(responseListener, headers)
  51             }
  52         }
  53     }
  54 }