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org.springframework.web.servlet.function.DefaultEntityResponseBuilder Maven / Gradle / Ivy
/*
* Copyright 2002-2020 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.servlet.function;
import java.io.IOException;
import java.lang.reflect.Type;
import java.net.URI;
import java.time.Instant;
import java.time.ZonedDateTime;
import java.util.Arrays;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;
import java.util.concurrent.CompletionStage;
import java.util.function.Consumer;
import java.util.stream.Collectors;
import javax.servlet.AsyncContext;
import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpServletResponseWrapper;
import org.reactivestreams.Publisher;
import org.reactivestreams.Subscriber;
import org.reactivestreams.Subscription;
import org.springframework.core.ParameterizedTypeReference;
import org.springframework.core.io.InputStreamResource;
import org.springframework.core.io.Resource;
import org.springframework.core.io.support.ResourceRegion;
import org.springframework.http.CacheControl;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.http.HttpRange;
import org.springframework.http.HttpStatus;
import org.springframework.http.InvalidMediaTypeException;
import org.springframework.http.MediaType;
import org.springframework.http.converter.GenericHttpMessageConverter;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.server.ServletServerHttpResponse;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
import org.springframework.util.ClassUtils;
import org.springframework.util.LinkedMultiValueMap;
import org.springframework.util.MultiValueMap;
import org.springframework.web.HttpMediaTypeNotAcceptableException;
import org.springframework.web.servlet.ModelAndView;
/**
* Default {@link EntityResponse.Builder} implementation.
*
* @author Arjen Poutsma
* @since 5.2
* @param the entity type
*/
final class DefaultEntityResponseBuilder implements EntityResponse.Builder {
private static final boolean reactiveStreamsPresent = ClassUtils.isPresent(
"org.reactivestreams.Publisher", DefaultEntityResponseBuilder.class.getClassLoader());
private static final Type RESOURCE_REGION_LIST_TYPE =
new ParameterizedTypeReference>() { }.getType();
private final T entity;
private final Type entityType;
private int status = HttpStatus.OK.value();
private final HttpHeaders headers = new HttpHeaders();
private final MultiValueMap cookies = new LinkedMultiValueMap<>();
private DefaultEntityResponseBuilder(T entity, @Nullable Type entityType) {
this.entity = entity;
this.entityType = (entityType != null) ? entityType : entity.getClass();
}
@Override
public EntityResponse.Builder status(HttpStatus status) {
Assert.notNull(status, "HttpStatus must not be null");
this.status = status.value();
return this;
}
@Override
public EntityResponse.Builder status(int status) {
this.status = status;
return this;
}
@Override
public EntityResponse.Builder cookie(Cookie cookie) {
Assert.notNull(cookie, "Cookie must not be null");
this.cookies.add(cookie.getName(), cookie);
return this;
}
@Override
public EntityResponse.Builder cookies(
Consumer> cookiesConsumer) {
cookiesConsumer.accept(this.cookies);
return this;
}
@Override
public EntityResponse.Builder header(String headerName, String... headerValues) {
for (String headerValue : headerValues) {
this.headers.add(headerName, headerValue);
}
return this;
}
@Override
public EntityResponse.Builder headers(Consumer headersConsumer) {
headersConsumer.accept(this.headers);
return this;
}
@Override
public EntityResponse.Builder allow(HttpMethod... allowedMethods) {
this.headers.setAllow(new LinkedHashSet<>(Arrays.asList(allowedMethods)));
return this;
}
@Override
public EntityResponse.Builder allow(Set allowedMethods) {
this.headers.setAllow(allowedMethods);
return this;
}
@Override
public EntityResponse.Builder contentLength(long contentLength) {
this.headers.setContentLength(contentLength);
return this;
}
@Override
public EntityResponse.Builder contentType(MediaType contentType) {
this.headers.setContentType(contentType);
return this;
}
@Override
public EntityResponse.Builder eTag(String etag) {
if (!etag.startsWith("\"") && !etag.startsWith("W/\"")) {
etag = "\"" + etag;
}
if (!etag.endsWith("\"")) {
etag = etag + "\"";
}
this.headers.setETag(etag);
return this;
}
@Override
public EntityResponse.Builder lastModified(ZonedDateTime lastModified) {
this.headers.setLastModified(lastModified);
return this;
}
@Override
public EntityResponse.Builder lastModified(Instant lastModified) {
this.headers.setLastModified(lastModified);
return this;
}
@Override
public EntityResponse.Builder location(URI location) {
this.headers.setLocation(location);
return this;
}
@Override
public EntityResponse.Builder cacheControl(CacheControl cacheControl) {
this.headers.setCacheControl(cacheControl);
return this;
}
@Override
public EntityResponse.Builder varyBy(String... requestHeaders) {
this.headers.setVary(Arrays.asList(requestHeaders));
return this;
}
@SuppressWarnings({"rawtypes", "unchecked"})
@Override
public EntityResponse build() {
if (this.entity instanceof CompletionStage) {
CompletionStage completionStage = (CompletionStage) this.entity;
return new CompletionStageEntityResponse(this.status, this.headers, this.cookies,
completionStage, this.entityType);
}
else if (reactiveStreamsPresent && PublisherEntityResponse.isPublisher(this.entity)) {
Publisher publisher = (Publisher) this.entity;
return new PublisherEntityResponse(this.status, this.headers, this.cookies, publisher, this.entityType);
}
else {
return new DefaultEntityResponse<>(this.status, this.headers, this.cookies, this.entity, this.entityType);
}
}
/**
* Return a new {@link EntityResponse.Builder} from the given object.
*/
public static EntityResponse.Builder fromObject(T t) {
return new DefaultEntityResponseBuilder<>(t, null);
}
/**
* Return a new {@link EntityResponse.Builder} from the given object and type reference.
*/
public static EntityResponse.Builder fromObject(T t, ParameterizedTypeReference bodyType) {
return new DefaultEntityResponseBuilder<>(t, bodyType.getType());
}
/**
* Default {@link EntityResponse} implementation for synchronous bodies.
*/
private static class DefaultEntityResponse extends DefaultServerResponseBuilder.AbstractServerResponse
implements EntityResponse {
private final T entity;
private final Type entityType;
public DefaultEntityResponse(int statusCode, HttpHeaders headers,
MultiValueMap cookies, T entity, Type entityType) {
super(statusCode, headers, cookies);
this.entity = entity;
this.entityType = entityType;
}
private static boolean isResource(T entity) {
return !(entity instanceof InputStreamResource) &&
(entity instanceof Resource);
}
@Override
public T entity() {
return this.entity;
}
@Override
protected ModelAndView writeToInternal(HttpServletRequest servletRequest,
HttpServletResponse servletResponse, Context context)
throws ServletException, IOException {
writeEntityWithMessageConverters(this.entity, servletRequest,servletResponse, context);
return null;
}
@SuppressWarnings({ "unchecked", "resource" })
protected void writeEntityWithMessageConverters(Object entity, HttpServletRequest request,
HttpServletResponse response, ServerResponse.Context context)
throws ServletException, IOException {
ServletServerHttpResponse serverResponse = new ServletServerHttpResponse(response);
MediaType contentType = getContentType(response);
Class entityClass = entity.getClass();
Type entityType = this.entityType;
if (entityClass != InputStreamResource.class && Resource.class.isAssignableFrom(entityClass)) {
serverResponse.getHeaders().set(HttpHeaders.ACCEPT_RANGES, "bytes");
String rangeHeader = request.getHeader(HttpHeaders.RANGE);
if (rangeHeader != null) {
Resource resource = (Resource) entity;
try {
List httpRanges = HttpRange.parseRanges(rangeHeader);
serverResponse.getServletResponse().setStatus(HttpStatus.PARTIAL_CONTENT.value());
entity = HttpRange.toResourceRegions(httpRanges, resource);
entityClass = entity.getClass();
entityType = RESOURCE_REGION_LIST_TYPE;
}
catch (IllegalArgumentException ex) {
serverResponse.getHeaders().set(HttpHeaders.CONTENT_RANGE, "bytes */" + resource.contentLength());
serverResponse.getServletResponse().setStatus(HttpStatus.REQUESTED_RANGE_NOT_SATISFIABLE.value());
}
}
}
for (HttpMessageConverter messageConverter : context.messageConverters()) {
if (messageConverter instanceof GenericHttpMessageConverter) {
GenericHttpMessageConverter genericMessageConverter =
(GenericHttpMessageConverter) messageConverter;
if (genericMessageConverter.canWrite(entityType, entityClass, contentType)) {
genericMessageConverter.write(entity, entityType, contentType, serverResponse);
return;
}
}
if (messageConverter.canWrite(entityClass, contentType)) {
((HttpMessageConverter)messageConverter).write(entity, contentType, serverResponse);
return;
}
}
List producibleMediaTypes = producibleMediaTypes(context.messageConverters(), entityClass);
throw new HttpMediaTypeNotAcceptableException(producibleMediaTypes);
}
@Nullable
private static MediaType getContentType(HttpServletResponse response) {
try {
return MediaType.parseMediaType(response.getContentType()).removeQualityValue();
}
catch (InvalidMediaTypeException ex) {
return null;
}
}
protected void tryWriteEntityWithMessageConverters(Object entity, HttpServletRequest request,
HttpServletResponse response, ServerResponse.Context context) {
try {
writeEntityWithMessageConverters(entity, request, response, context);
}
catch (IOException | ServletException ex) {
handleError(ex, request, response, context);
}
}
private static List producibleMediaTypes(
List> messageConverters,
Class entityClass) {
return messageConverters.stream()
.filter(messageConverter -> messageConverter.canWrite(entityClass, null))
.flatMap(messageConverter -> messageConverter.getSupportedMediaTypes().stream())
.collect(Collectors.toList());
}
}
/**
* {@link EntityResponse} implementation for asynchronous {@link CompletionStage} bodies.
*/
private static class CompletionStageEntityResponse extends DefaultEntityResponse> {
public CompletionStageEntityResponse(int statusCode, HttpHeaders headers,
MultiValueMap cookies, CompletionStage entity, Type entityType) {
super(statusCode, headers, cookies, entity, entityType);
}
@Override
protected ModelAndView writeToInternal(HttpServletRequest servletRequest,
HttpServletResponse servletResponse, Context context) {
AsyncContext asyncContext = servletRequest.startAsync(servletRequest, servletResponse);
entity().whenComplete((entity, throwable) -> {
try {
if (entity != null) {
tryWriteEntityWithMessageConverters(entity,
(HttpServletRequest) asyncContext.getRequest(),
(HttpServletResponse) asyncContext.getResponse(),
context);
}
else if (throwable != null) {
handleError(throwable, servletRequest, servletResponse, context);
}
}
finally {
asyncContext.complete();
}
});
return null;
}
}
private static class PublisherEntityResponse extends DefaultEntityResponse> {
public PublisherEntityResponse(int statusCode, HttpHeaders headers,
MultiValueMap cookies, Publisher entity, Type entityType) {
super(statusCode, headers, cookies, entity, entityType);
}
@Override
protected ModelAndView writeToInternal(HttpServletRequest servletRequest,
HttpServletResponse servletResponse, Context context) {
AsyncContext asyncContext = servletRequest.startAsync(servletRequest,
new NoContentLengthResponseWrapper(servletResponse));
entity().subscribe(new ProducingSubscriber(asyncContext, context));
return null;
}
public static boolean isPublisher(Object entity) {
return (entity instanceof Publisher);
}
@SuppressWarnings("SubscriberImplementation")
private class ProducingSubscriber implements Subscriber {
private final AsyncContext asyncContext;
private final Context context;
@Nullable
private Subscription subscription;
public ProducingSubscriber(AsyncContext asyncContext, Context context) {
this.asyncContext = asyncContext;
this.context = context;
}
@Override
public void onSubscribe(Subscription s) {
if (this.subscription == null) {
this.subscription = s;
this.subscription.request(Long.MAX_VALUE);
}
else {
s.cancel();
}
}
@Override
public void onNext(T element) {
HttpServletRequest servletRequest = (HttpServletRequest) this.asyncContext.getRequest();
HttpServletResponse servletResponse = (HttpServletResponse) this.asyncContext.getResponse();
tryWriteEntityWithMessageConverters(element, servletRequest, servletResponse, this.context);
}
@Override
public void onError(Throwable t) {
handleError(t, (HttpServletRequest) this.asyncContext.getRequest(),
(HttpServletResponse) this.asyncContext.getResponse(), this.context);
this.asyncContext.complete();
}
@Override
public void onComplete() {
this.asyncContext.complete();
}
}
private static class NoContentLengthResponseWrapper extends HttpServletResponseWrapper {
public NoContentLengthResponseWrapper(HttpServletResponse response) {
super(response);
}
@Override
public void addIntHeader(String name, int value) {
if (!HttpHeaders.CONTENT_LENGTH.equals(name)) {
super.addIntHeader(name, value);
}
}
@Override
public void addHeader(String name, String value) {
if (!HttpHeaders.CONTENT_LENGTH.equals(name)) {
super.addHeader(name, value);
}
}
@Override
public void setContentLength(int len) {
}
@Override
public void setContentLengthLong(long len) {
}
}
}
}
