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/*

* Copyright © 2012 The Feign Authors (feign@commonhaus.dev)

*

* 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 feign;

import java.lang.reflect.ParameterizedType;

import java.lang.reflect.Type;

import java.util.Collection;

/**

* An implementation of {@link ResponseInterceptor} the returns the value of the location header

* when appropriate.

*/

public class RedirectionInterceptor implements ResponseInterceptor {

@Override

public Object intercept(InvocationContext invocationContext, Chain chain) throws Exception {

Response response = invocationContext.response();

int status = response.status();

Object returnValue = null;

if (300 <= status && status < 400 && response.headers().containsKey("Location")) {

Type returnType = rawType(invocationContext.returnType());

Collection<String> locations = response.headers().get("Location");

if (Collection.class.equals(returnType)) {

returnValue = locations;

} else if (String.class.equals(returnType)) {

if (locations.isEmpty()) {

returnValue = "";

} else {

returnValue = locations.stream().findFirst().orElse("");

}

}

}

if (returnValue == null) {

return chain.next(invocationContext);

} else {

response.close();

return returnValue;

}

}

private Type rawType(Type type) {

return type instanceof ParameterizedType ? ((ParameterizedType) type).getRawType() : type;

}

}