/*
* Copyright 2002-2025 the original author or 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
*
* https://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 org.springframework.web.reactive.function.client.support;
import java.net.URI;
import org.reactivestreams.Publisher;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
import org.springframework.core.ParameterizedTypeReference;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.http.ResponseEntity;
import org.springframework.util.Assert;
import org.springframework.web.reactive.function.client.WebClient;
import org.springframework.web.service.invoker.AbstractReactorHttpExchangeAdapter;
import org.springframework.web.service.invoker.HttpRequestValues;
import org.springframework.web.service.invoker.HttpServiceProxyFactory;
import org.springframework.web.service.invoker.ReactiveHttpRequestValues;
import org.springframework.web.service.invoker.ReactorHttpExchangeAdapter;
import org.springframework.web.util.UriBuilderFactory;
/**
* {@link ReactorHttpExchangeAdapter} that enables an {@link HttpServiceProxyFactory}
* to use {@link WebClient} for request execution.
*
*
Use static factory methods in this class to create an
* {@code HttpServiceProxyFactory} configured with a given {@code WebClient}.
*
* @author Rossen Stoyanchev
* @since 6.0
*/
public final class WebClientAdapter extends AbstractReactorHttpExchangeAdapter {
private final WebClient webClient;
/**
* Package private constructor. See static factory methods.
*/
private WebClientAdapter(WebClient webClient) {
this.webClient = webClient;
}
@Override
public boolean supportsRequestAttributes() {
return true;
}
@Override
public Mono<Void> exchangeForMono(HttpRequestValues requestValues) {
return newRequest(requestValues).retrieve().toBodilessEntity().then();
}
@Override
public Mono<HttpHeaders> exchangeForHeadersMono(HttpRequestValues requestValues) {
return newRequest(requestValues).retrieve().toBodilessEntity().map(ResponseEntity::getHeaders);
}
@Override
public <T> Mono<T> exchangeForBodyMono(HttpRequestValues requestValues, ParameterizedTypeReference<T> bodyType) {
return newRequest(requestValues).retrieve().bodyToMono(bodyType);
}
@Override
public <T> Flux<T> exchangeForBodyFlux(HttpRequestValues requestValues, ParameterizedTypeReference<T> bodyType) {
return newRequest(requestValues).retrieve().bodyToFlux(bodyType);
}
@Override
public Mono<ResponseEntity<Void>> exchangeForBodilessEntityMono(HttpRequestValues requestValues) {
return newRequest(requestValues).retrieve().toBodilessEntity();
}
@Override
public <T> Mono<ResponseEntity<T>> exchangeForEntityMono(HttpRequestValues requestValues, ParameterizedTypeReference<T> bodyType) {
return newRequest(requestValues).retrieve().toEntity(bodyType);
}
@Override
public <T> Mono<ResponseEntity<Flux<T>>> exchangeForEntityFlux(HttpRequestValues requestValues, ParameterizedTypeReference<T> bodyType) {
return newRequest(requestValues).retrieve().toEntityFlux(bodyType);
}
@SuppressWarnings({"ReactiveStreamsUnusedPublisher", "unchecked"})
private WebClient.RequestBodySpec newRequest(HttpRequestValues values) {
HttpMethod httpMethod = values.getHttpMethod();
Assert.notNull(httpMethod, "HttpMethod is required");
WebClient.RequestBodyUriSpec uriSpec = this.webClient.method(httpMethod);
WebClient.RequestBodySpec bodySpec;
if (values.getUri() != null) {
bodySpec = uriSpec.uri(values.getUri());
}
else if (values.getUriTemplate() != null) {
UriBuilderFactory uriBuilderFactory = values.getUriBuilderFactory();
if(uriBuilderFactory != null){
URI uri = uriBuilderFactory.expand(values.getUriTemplate(), values.getUriVariables());
bodySpec = uriSpec.uri(uri);
}
else {
bodySpec = uriSpec.uri(values.getUriTemplate(), values.getUriVariables());
}
}
else {
throw new IllegalStateException("Neither full URL nor URI template");
}
bodySpec.headers(headers -> headers.putAll(values.getHeaders()));
bodySpec.cookies(cookies -> cookies.putAll(values.getCookies()));
bodySpec.attributes(attributes -> attributes.putAll(values.getAttributes()));
if (values.getBodyValue() != null) {
if (values.getBodyValueType() != null) {
B body = (B) values.getBodyValue();
bodySpec.bodyValue(body, (ParameterizedTypeReference) values.getBodyValueType());
}
else {
bodySpec.bodyValue(values.getBodyValue());
}
}
else if (values instanceof ReactiveHttpRequestValues rhrv) {
Publisher<?> body = rhrv.getBodyPublisher();
if (body != null) {
ParameterizedTypeReference<?> elementType = rhrv.getBodyPublisherElementType();
Assert.notNull(elementType, "Publisher body element type is required");
bodySpec.body(body, elementType);
}
}
return bodySpec;
}
/**
* Create a {@link WebClientAdapter} for the given {@code WebClient} instance.
* @param webClient the client to use
* @return the created adapter instance
* @since 6.1
*/
public static WebClientAdapter create(WebClient webClient) {
return new WebClientAdapter(webClient);
}
}
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