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DefaultClientResponseBuilder.java
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DefaultClientResponseBuilder.java
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/*
* Copyright 2002-2024 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;
import java.net.URI;
import java.nio.charset.StandardCharsets;
import java.util.function.Consumer;
import java.util.function.Function;
import reactor.core.publisher.Flux;
import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.core.io.buffer.DataBufferUtils;
import org.springframework.core.io.buffer.DefaultDataBufferFactory;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.http.HttpRequest;
import org.springframework.http.HttpStatus;
import org.springframework.http.HttpStatusCode;
import org.springframework.http.ResponseCookie;
import org.springframework.http.client.reactive.ClientHttpResponse;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
import org.springframework.util.CollectionUtils;
import org.springframework.util.LinkedMultiValueMap;
import org.springframework.util.MultiValueMap;
/**
* Default implementation of {@link ClientResponse.Builder}.
*
* @author Arjen Poutsma
* @since 5.0.5
*/
final class DefaultClientResponseBuilder implements ClientResponse.Builder {
private static final HttpRequest EMPTY_REQUEST = new HttpRequest() {
private final URI empty = URI.create("");
@Override
public HttpMethod getMethod() {
return HttpMethod.valueOf("UNKNOWN");
}
@Override
public URI getURI() {
return this.empty;
}
@Override
public HttpHeaders getHeaders() {
return HttpHeaders.EMPTY;
}
};
private final ExchangeStrategies strategies;
private HttpStatusCode statusCode = HttpStatus.OK;
@Nullable
private HttpHeaders headers;
@Nullable
private MultiValueMap<String, ResponseCookie> cookies;
private Flux<DataBuffer> body = Flux.empty();
@Nullable
private ClientResponse originalResponse;
private HttpRequest request;
DefaultClientResponseBuilder(ExchangeStrategies strategies) {
Assert.notNull(strategies, "ExchangeStrategies must not be null");
this.strategies = strategies;
this.headers = new HttpHeaders();
this.cookies = new LinkedMultiValueMap<>();
this.request = EMPTY_REQUEST;
}
DefaultClientResponseBuilder(ClientResponse other, boolean mutate) {
Assert.notNull(other, "ClientResponse must not be null");
this.strategies = other.strategies();
this.statusCode = other.statusCode();
if (mutate) {
this.body = other.bodyToFlux(DataBuffer.class);
}
else {
this.headers = new HttpHeaders();
this.headers.addAll(other.headers().asHttpHeaders());
}
this.originalResponse = other;
this.request = (other instanceof DefaultClientResponse defaultClientResponse ?
defaultClientResponse.request() : EMPTY_REQUEST);
}
@Override
public DefaultClientResponseBuilder statusCode(HttpStatusCode statusCode) {
Assert.notNull(statusCode, "HttpStatusCode must not be null");
this.statusCode = statusCode;
return this;
}
@Override
public DefaultClientResponseBuilder rawStatusCode(int statusCode) {
return statusCode(HttpStatusCode.valueOf(statusCode));
}
@Override
public ClientResponse.Builder header(String headerName, String... headerValues) {
for (String headerValue : headerValues) {
getHeaders().add(headerName, headerValue);
}
return this;
}
@Override
public ClientResponse.Builder headers(Consumer<HttpHeaders> headersConsumer) {
headersConsumer.accept(getHeaders());
return this;
}
@SuppressWarnings("ConstantConditions")
private HttpHeaders getHeaders() {
if (this.headers == null) {
this.headers = HttpHeaders.writableHttpHeaders(this.originalResponse.headers().asHttpHeaders());
}
return this.headers;
}
@Override
public DefaultClientResponseBuilder cookie(String name, String... values) {
for (String value : values) {
getCookies().add(name, ResponseCookie.from(name, value).build());
}
return this;
}
@Override
public ClientResponse.Builder cookies(Consumer<MultiValueMap<String, ResponseCookie>> cookiesConsumer) {
cookiesConsumer.accept(getCookies());
return this;
}
@SuppressWarnings("ConstantConditions")
private MultiValueMap<String, ResponseCookie> getCookies() {
if (this.cookies == null) {
this.cookies = new LinkedMultiValueMap<>(this.originalResponse.cookies());
}
return this.cookies;
}
@Override
public ClientResponse.Builder body(Function<Flux<DataBuffer>, Flux<DataBuffer>> transformer) {
this.body = transformer.apply(this.body);
return this;
}
@Override
public ClientResponse.Builder body(Flux<DataBuffer> body) {
Assert.notNull(body, "Body must not be null");
releaseBody();
this.body = body;
return this;
}
@Override
public ClientResponse.Builder body(String body) {
Assert.notNull(body, "Body must not be null");
releaseBody();
this.body = Flux.just(body).
map(s -> {
byte[] bytes = body.getBytes(StandardCharsets.UTF_8);
return DefaultDataBufferFactory.sharedInstance.wrap(bytes);
});
return this;
}
private void releaseBody() {
this.body.subscribe(DataBufferUtils.releaseConsumer());
}
@Override
public ClientResponse.Builder request(HttpRequest request) {
Assert.notNull(request, "Request must not be null");
this.request = request;
return this;
}
@Override
public ClientResponse build() {
ClientHttpResponse httpResponse = new BuiltClientHttpResponse(
this.statusCode, this.headers, this.cookies, this.body, this.originalResponse);
return new DefaultClientResponse(httpResponse, this.strategies,
this.originalResponse != null ? this.originalResponse.logPrefix() : "",
WebClientUtils.getRequestDescription(this.request.getMethod(), this.request.getURI()),
() -> this.request);
}
private static class BuiltClientHttpResponse implements ClientHttpResponse {
private final HttpStatusCode statusCode;
@Nullable
private final HttpHeaders headers;
@Nullable
private final MultiValueMap<String, ResponseCookie> cookies;
private final Flux<DataBuffer> body;
@Nullable
private final ClientResponse originalResponse;
BuiltClientHttpResponse(HttpStatusCode statusCode, @Nullable HttpHeaders headers,
@Nullable MultiValueMap<String, ResponseCookie> cookies, Flux<DataBuffer> body,
@Nullable ClientResponse originalResponse) {
Assert.isTrue(headers != null || originalResponse != null,
"Expected either headers or an original response with headers.");
Assert.isTrue(cookies != null || originalResponse != null,
"Expected either cookies or an original response with cookies.");
this.statusCode = statusCode;
this.headers = (headers != null ? HttpHeaders.readOnlyHttpHeaders(headers) : null);
this.cookies = (cookies != null ? CollectionUtils.unmodifiableMultiValueMap(cookies) : null);
this.body = body;
this.originalResponse = originalResponse;
}
@Override
public HttpStatusCode getStatusCode() {
return this.statusCode;
}
@Override
@SuppressWarnings("ConstantConditions")
public HttpHeaders getHeaders() {
return (this.headers != null ? this.headers : this.originalResponse.headers().asHttpHeaders());
}
@Override
@SuppressWarnings("ConstantConditions")
public MultiValueMap<String, ResponseCookie> getCookies() {
return (this.cookies != null ? this.cookies : this.originalResponse.cookies());
}
@Override
public Flux<DataBuffer> getBody() {
return this.body;
}
}
}