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RedirectionInterceptor.java
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executable file
·56 lines (53 loc) · 1.94 KB
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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;
}
}