io.micronaut.web.router.version.resolution.HeaderVersionResolver Maven / Gradle / Ivy
/*
* Copyright 2017-2019 original authors
*
* 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 io.micronaut.web.router.version.resolution;
import io.micronaut.context.annotation.Requires;
import io.micronaut.http.HttpRequest;
import io.micronaut.web.router.version.RoutesVersioningConfiguration;
import javax.inject.Inject;
import javax.inject.Singleton;
import java.util.List;
import java.util.Objects;
import java.util.Optional;
/**
* A {@link RequestVersionResolver} responsible for extracting version from {@link io.micronaut.http.HttpHeaders}.
*
* @author Bogdan Oros
* @since 1.1.0
*/
@Singleton
@Requires(beans = {RoutesVersioningConfiguration.class, HeaderVersionResolverConfiguration.class})
public class HeaderVersionResolver implements RequestVersionResolver {
private final List headerNames;
/**
* Creates a {@link RequestVersionResolver} to extract version from request header.
*
* @param configuration A configuration to pick correct request header names.
*/
@Inject
public HeaderVersionResolver(HeaderVersionResolverConfiguration configuration) {
this.headerNames = configuration.getNames();
}
@Override
public Optional resolve(HttpRequest request) {
return headerNames.stream()
.map(name -> request.getHeaders().get(name))
.filter(Objects::nonNull)
.findFirst();
}
}