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/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2019 Bell Canada.
* Modifications Copyright (C) 2019 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* 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.policy.cds.client;
import io.grpc.CallOptions;
import io.grpc.Channel;
import io.grpc.ClientCall;
import io.grpc.ClientInterceptor;
import io.grpc.ForwardingClientCall;
import io.grpc.Metadata;
import io.grpc.Metadata.Key;
import io.grpc.MethodDescriptor;
import org.onap.policy.cds.properties.CdsServerProperties;
/**
* An interceptor to insert the client authHeader.
*
* <p>The {@link BasicAuthClientHeaderInterceptor} implements {@link ClientInterceptor} to insert authorization
* header data provided by {@link CdsServerProperties#getBasicAuth()} to all the outgoing calls.</p>
*
* <p>On the client context, we add metadata with "Authorization" as the key and "Basic" followed by base64 encoded
* username:password as its value.
* On the server side, CDS BasicAuthServerInterceptor (1) gets the client metadata from the server context, (2) extract
* the "Authorization" header key and finally (3) decodes the username and password from the authHeader.</p>
*/
public class BasicAuthClientHeaderInterceptor implements ClientInterceptor {
static final String BASIC_AUTH_HEADER_KEY = "Authorization";
private CdsServerProperties props;
BasicAuthClientHeaderInterceptor(CdsServerProperties props) {
this.props = props;
}
@Override
public <Q, P> ClientCall<Q, P> interceptCall(MethodDescriptor<Q, P> method,
CallOptions callOptions, Channel channel) {
Key<String> authHeader = Key.of(BASIC_AUTH_HEADER_KEY, Metadata.ASCII_STRING_MARSHALLER);
return new ForwardingClientCall.SimpleForwardingClientCall<Q, P>(channel.newCall(method, callOptions)) {
@Override
public void start(Listener<P> responseListener, Metadata headers) {
headers.put(authHeader, props.getBasicAuth());
super.start(responseListener, headers);
}
};
}
}
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