/
RequestMappingInfoHandlerMapping.java
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/
RequestMappingInfoHandlerMapping.java
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/*
* Copyright 2002-2022 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.result.method;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import reactor.core.publisher.Mono;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.http.InvalidMediaTypeException;
import org.springframework.http.MediaType;
import org.springframework.http.server.PathContainer;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.util.Assert;
import org.springframework.util.CollectionUtils;
import org.springframework.util.MultiValueMap;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.filter.reactive.ServerHttpObservationFilter;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.reactive.HandlerMapping;
import org.springframework.web.reactive.result.condition.NameValueExpression;
import org.springframework.web.reactive.result.condition.ProducesRequestCondition;
import org.springframework.web.server.MethodNotAllowedException;
import org.springframework.web.server.NotAcceptableStatusException;
import org.springframework.web.server.ServerWebExchange;
import org.springframework.web.server.ServerWebInputException;
import org.springframework.web.server.UnsatisfiedRequestParameterException;
import org.springframework.web.server.UnsupportedMediaTypeStatusException;
import org.springframework.web.util.pattern.PathPattern;
/**
* Abstract base class for classes for which {@link RequestMappingInfo} defines
* the mapping between a request and a handler method.
*
* @author Rossen Stoyanchev
* @author Sam Brannen
* @since 5.0
*/
public abstract class RequestMappingInfoHandlerMapping extends AbstractHandlerMethodMapping<RequestMappingInfo> {
private static final Method HTTP_OPTIONS_HANDLE_METHOD;
static {
try {
HTTP_OPTIONS_HANDLE_METHOD = HttpOptionsHandler.class.getMethod("handle");
}
catch (NoSuchMethodException ex) {
// Should never happen
throw new IllegalStateException("No handler for HTTP OPTIONS", ex);
}
}
@Override
protected Set<String> getDirectPaths(RequestMappingInfo info) {
return info.getDirectPaths();
}
/**
* Check if the given RequestMappingInfo matches the current request and
* return a (potentially new) instance with conditions that match the
* current request -- for example with a subset of URL patterns.
* @return an info in case of a match; or {@code null} otherwise.
*/
@Override
protected RequestMappingInfo getMatchingMapping(RequestMappingInfo info, ServerWebExchange exchange) {
return info.getMatchingCondition(exchange);
}
/**
* Provide a Comparator to sort RequestMappingInfos matched to a request.
*/
@Override
protected Comparator<RequestMappingInfo> getMappingComparator(final ServerWebExchange exchange) {
return (info1, info2) -> info1.compareTo(info2, exchange);
}
@Override
public Mono<HandlerMethod> getHandlerInternal(ServerWebExchange exchange) {
exchange.getAttributes().remove(HandlerMapping.PRODUCIBLE_MEDIA_TYPES_ATTRIBUTE);
return super.getHandlerInternal(exchange)
.doOnTerminate(() -> ProducesRequestCondition.clearMediaTypesAttribute(exchange));
}
/**
* Expose URI template variables, matrix variables, and producible media types in the request.
* @see HandlerMapping#URI_TEMPLATE_VARIABLES_ATTRIBUTE
* @see HandlerMapping#MATRIX_VARIABLES_ATTRIBUTE
* @see HandlerMapping#PRODUCIBLE_MEDIA_TYPES_ATTRIBUTE
*/
@Override
protected void handleMatch(RequestMappingInfo info, HandlerMethod handlerMethod,
ServerWebExchange exchange) {
super.handleMatch(info, handlerMethod, exchange);
PathContainer lookupPath = exchange.getRequest().getPath().pathWithinApplication();
PathPattern bestPattern;
Map<String, String> uriVariables;
Map<String, MultiValueMap<String, String>> matrixVariables;
Set<PathPattern> patterns = info.getPatternsCondition().getPatterns();
if (patterns.isEmpty()) {
bestPattern = getPathPatternParser().parse(lookupPath.value());
uriVariables = Collections.emptyMap();
matrixVariables = Collections.emptyMap();
}
else {
bestPattern = patterns.iterator().next();
PathPattern.PathMatchInfo result = bestPattern.matchAndExtract(lookupPath);
Assert.notNull(result, () ->
"Expected bestPattern: " + bestPattern + " to match lookupPath " + lookupPath);
uriVariables = result.getUriVariables();
matrixVariables = result.getMatrixVariables();
}
exchange.getAttributes().put(BEST_MATCHING_HANDLER_ATTRIBUTE, handlerMethod);
exchange.getAttributes().put(BEST_MATCHING_PATTERN_ATTRIBUTE, bestPattern);
ServerHttpObservationFilter.findObservationContext(exchange)
.ifPresent(context -> context.setPathPattern(bestPattern.toString()));
exchange.getAttributes().put(URI_TEMPLATE_VARIABLES_ATTRIBUTE, uriVariables);
exchange.getAttributes().put(MATRIX_VARIABLES_ATTRIBUTE, matrixVariables);
ProducesRequestCondition producesCondition = info.getProducesCondition();
if (!producesCondition.isEmpty()) {
Set<MediaType> mediaTypes = producesCondition.getProducibleMediaTypes();
if (!mediaTypes.isEmpty()) {
exchange.getAttributes().put(PRODUCIBLE_MEDIA_TYPES_ATTRIBUTE, mediaTypes);
}
}
}
/**
* Iterate all RequestMappingInfos once again, look if any match by URL at
* least and raise exceptions accordingly.
* @throws MethodNotAllowedException for matches by URL but not by HTTP method
* @throws UnsupportedMediaTypeStatusException if there are matches by URL
* and HTTP method but not by consumable media types
* @throws NotAcceptableStatusException if there are matches by URL and HTTP
* method but not by producible media types
* @throws ServerWebInputException if there are matches by URL and HTTP
* method but not by query parameter conditions
*/
@Override
protected HandlerMethod handleNoMatch(Set<RequestMappingInfo> infos,
ServerWebExchange exchange) throws Exception {
if (CollectionUtils.isEmpty(infos)) {
return null;
}
PartialMatchHelper helper = new PartialMatchHelper(infos, exchange);
if (helper.isEmpty()) {
return null;
}
ServerHttpRequest request = exchange.getRequest();
if (helper.hasMethodsMismatch()) {
HttpMethod httpMethod = request.getMethod();
Set<HttpMethod> methods = helper.getAllowedMethods();
if (HttpMethod.OPTIONS.equals(httpMethod)) {
Set<MediaType> mediaTypes = helper.getConsumablePatchMediaTypes();
HttpOptionsHandler handler = new HttpOptionsHandler(methods, mediaTypes);
return new HandlerMethod(handler, HTTP_OPTIONS_HANDLE_METHOD);
}
throw new MethodNotAllowedException(httpMethod, methods);
}
if (helper.hasConsumesMismatch()) {
Set<MediaType> mediaTypes = helper.getConsumableMediaTypes();
MediaType contentType;
try {
contentType = request.getHeaders().getContentType();
}
catch (InvalidMediaTypeException ex) {
throw new UnsupportedMediaTypeStatusException(ex.getMessage());
}
throw new UnsupportedMediaTypeStatusException(
contentType, new ArrayList<>(mediaTypes), exchange.getRequest().getMethod());
}
if (helper.hasProducesMismatch()) {
Set<MediaType> mediaTypes = helper.getProducibleMediaTypes();
throw new NotAcceptableStatusException(new ArrayList<>(mediaTypes));
}
if (helper.hasParamsMismatch()) {
throw new UnsatisfiedRequestParameterException(
helper.getParamConditions().stream().map(Object::toString).toList(),
request.getQueryParams());
}
return null;
}
/**
* Aggregate all partial matches and expose methods checking across them.
*/
private static final class PartialMatchHelper {
private final List<PartialMatch> partialMatches = new ArrayList<>();
PartialMatchHelper(Set<RequestMappingInfo> infos, ServerWebExchange exchange) {
for (RequestMappingInfo info : infos) {
if (info.getPatternsCondition().getMatchingCondition(exchange) != null) {
this.partialMatches.add(new PartialMatch(info, exchange));
}
}
}
/**
* Whether there are any partial matches.
*/
public boolean isEmpty() {
return this.partialMatches.isEmpty();
}
/**
* Any partial matches for "methods"?
*/
public boolean hasMethodsMismatch() {
return this.partialMatches.stream().noneMatch(PartialMatch::hasMethodsMatch);
}
/**
* Any partial matches for "methods" and "consumes"?
*/
public boolean hasConsumesMismatch() {
return this.partialMatches.stream().noneMatch(PartialMatch::hasConsumesMatch);
}
/**
* Any partial matches for "methods", "consumes", and "produces"?
*/
public boolean hasProducesMismatch() {
return this.partialMatches.stream().noneMatch(PartialMatch::hasProducesMatch);
}
/**
* Any partial matches for "methods", "consumes", "produces", and "params"?
*/
public boolean hasParamsMismatch() {
return this.partialMatches.stream().noneMatch(PartialMatch::hasParamsMatch);
}
/**
* Return declared HTTP methods.
*/
public Set<HttpMethod> getAllowedMethods() {
return this.partialMatches.stream()
.flatMap(m -> m.getInfo().getMethodsCondition().getMethods().stream())
.map(requestMethod -> HttpMethod.valueOf(requestMethod.name()))
.collect(Collectors.toSet());
}
/**
* Return declared "consumable" types but only among those that also
* match the "methods" condition.
*/
public Set<MediaType> getConsumableMediaTypes() {
return this.partialMatches.stream()
.filter(PartialMatch::hasMethodsMatch)
.flatMap(m -> m.getInfo().getConsumesCondition().getConsumableMediaTypes().stream())
.collect(Collectors.toCollection(LinkedHashSet::new));
}
/**
* Return declared "producible" types but only among those that also
* match the "methods" and "consumes" conditions.
*/
public Set<MediaType> getProducibleMediaTypes() {
return this.partialMatches.stream()
.filter(PartialMatch::hasConsumesMatch)
.flatMap(m -> m.getInfo().getProducesCondition().getProducibleMediaTypes().stream())
.collect(Collectors.toCollection(LinkedHashSet::new));
}
/**
* Return declared "params" conditions but only among those that also
* match the "methods", "consumes", and "params" conditions.
*/
public List<Set<NameValueExpression<String>>> getParamConditions() {
return this.partialMatches.stream()
.filter(PartialMatch::hasProducesMatch)
.map(match -> match.getInfo().getParamsCondition().getExpressions())
.toList();
}
/**
* Return declared "consumable" types but only among those that have
* PATCH specified, or that have no methods at all.
*/
public Set<MediaType> getConsumablePatchMediaTypes() {
Set<MediaType> result = new LinkedHashSet<>();
for (PartialMatch match : this.partialMatches) {
Set<RequestMethod> methods = match.getInfo().getMethodsCondition().getMethods();
if (methods.isEmpty() || methods.contains(RequestMethod.PATCH)) {
result.addAll(match.getInfo().getConsumesCondition().getConsumableMediaTypes());
}
}
return result;
}
/**
* Container for a RequestMappingInfo that matches the URL path at least.
*/
private static class PartialMatch {
private final RequestMappingInfo info;
private final boolean methodsMatch;
private final boolean consumesMatch;
private final boolean producesMatch;
private final boolean paramsMatch;
/**
* Create a new {@link PartialMatch} instance.
* @param info the RequestMappingInfo that matches the URL path
* @param exchange the current exchange
*/
public PartialMatch(RequestMappingInfo info, ServerWebExchange exchange) {
this.info = info;
this.methodsMatch = info.getMethodsCondition().getMatchingCondition(exchange) != null;
this.consumesMatch = info.getConsumesCondition().getMatchingCondition(exchange) != null;
this.producesMatch = info.getProducesCondition().getMatchingCondition(exchange) != null;
this.paramsMatch = info.getParamsCondition().getMatchingCondition(exchange) != null;
}
public RequestMappingInfo getInfo() {
return this.info;
}
public boolean hasMethodsMatch() {
return this.methodsMatch;
}
public boolean hasConsumesMatch() {
return hasMethodsMatch() && this.consumesMatch;
}
public boolean hasProducesMatch() {
return hasConsumesMatch() && this.producesMatch;
}
public boolean hasParamsMatch() {
return hasProducesMatch() && this.paramsMatch;
}
@Override
public String toString() {
return this.info.toString();
}
}
}
/**
* Default handler for HTTP OPTIONS.
*/
private static class HttpOptionsHandler {
private final HttpHeaders headers = new HttpHeaders();
public HttpOptionsHandler(Set<HttpMethod> declaredMethods, Set<MediaType> acceptPatch) {
this.headers.setAllow(initAllowedHttpMethods(declaredMethods));
this.headers.setAcceptPatch(new ArrayList<>(acceptPatch));
}
private static Set<HttpMethod> initAllowedHttpMethods(Set<HttpMethod> declaredMethods) {
if (declaredMethods.isEmpty()) {
return Stream.of(HttpMethod.values())
.filter(method -> !HttpMethod.TRACE.equals(method))
.collect(Collectors.toSet());
}
else {
Set<HttpMethod> result = new LinkedHashSet<>(declaredMethods);
if (result.contains(HttpMethod.GET)) {
result.add(HttpMethod.HEAD);
}
result.add(HttpMethod.OPTIONS);
return result;
}
}
@SuppressWarnings("unused")
public HttpHeaders handle() {
return this.headers;
}
}
}