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/*
* 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.mvc.method;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.http.InvalidMediaTypeException;
import org.springframework.http.MediaType;
import org.springframework.util.CollectionUtils;
import org.springframework.util.MultiValueMap;
import org.springframework.util.StringUtils;
import org.springframework.web.HttpMediaTypeNotAcceptableException;
import org.springframework.web.HttpMediaTypeNotSupportedException;
import org.springframework.web.HttpRequestMethodNotSupportedException;
import org.springframework.web.bind.UnsatisfiedServletRequestParameterException;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerMapping;
import org.springframework.web.servlet.handler.AbstractHandlerMethodMapping;
import org.springframework.web.servlet.mvc.condition.NameValueExpression;
import org.springframework.web.servlet.mvc.condition.ProducesRequestCondition;
import org.springframework.web.util.WebUtils;
/**
* Abstract base class for classes for which {@link RequestMappingInfo} defines
* the mapping between a request and a handler method.
*
* @author Arjen Poutsma
* @author Rossen Stoyanchev
* @since 3.1
*/
public abstract class RequestMappingInfoHandlerMapping extends AbstractHandlerMethodMapping {
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("Failed to retrieve internal handler method for HTTP OPTIONS", ex);
}
}
protected RequestMappingInfoHandlerMapping() {
setHandlerMethodMappingNamingStrategy(new RequestMappingInfoHandlerMethodMappingNamingStrategy());
}
/**
* Get the URL path patterns associated with the supplied {@link RequestMappingInfo}.
*/
@Override
protected Set getMappingPathPatterns(RequestMappingInfo info) {
return info.getPatternsCondition().getPatterns();
}
/**
* 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, HttpServletRequest request) {
return info.getMatchingCondition(request);
}
/**
* Provide a Comparator to sort RequestMappingInfos matched to a request.
*/
@Override
protected Comparator getMappingComparator(final HttpServletRequest request) {
return (info1, info2) -> info1.compareTo(info2, request);
}
@Override
protected HandlerMethod getHandlerInternal(HttpServletRequest request) throws Exception {
request.removeAttribute(PRODUCIBLE_MEDIA_TYPES_ATTRIBUTE);
try {
return super.getHandlerInternal(request);
}
finally {
ProducesRequestCondition.clearMediaTypesAttribute(request);
}
}
/**
* 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, String lookupPath, HttpServletRequest request) {
super.handleMatch(info, lookupPath, request);
String bestPattern;
Map uriVariables;
Set patterns = info.getPatternsCondition().getPatterns();
if (patterns.isEmpty()) {
bestPattern = lookupPath;
uriVariables = Collections.emptyMap();
}
else {
bestPattern = patterns.iterator().next();
uriVariables = getPathMatcher().extractUriTemplateVariables(bestPattern, lookupPath);
}
request.setAttribute(BEST_MATCHING_PATTERN_ATTRIBUTE, bestPattern);
if (isMatrixVariableContentAvailable()) {
Map> matrixVars = extractMatrixVariables(request, uriVariables);
request.setAttribute(HandlerMapping.MATRIX_VARIABLES_ATTRIBUTE, matrixVars);
}
Map decodedUriVariables = getUrlPathHelper().decodePathVariables(request, uriVariables);
request.setAttribute(HandlerMapping.URI_TEMPLATE_VARIABLES_ATTRIBUTE, decodedUriVariables);
if (!info.getProducesCondition().getProducibleMediaTypes().isEmpty()) {
Set mediaTypes = info.getProducesCondition().getProducibleMediaTypes();
request.setAttribute(PRODUCIBLE_MEDIA_TYPES_ATTRIBUTE, mediaTypes);
}
}
private boolean isMatrixVariableContentAvailable() {
return !getUrlPathHelper().shouldRemoveSemicolonContent();
}
private Map> extractMatrixVariables(
HttpServletRequest request, Map uriVariables) {
Map> result = new LinkedHashMap<>();
uriVariables.forEach((uriVarKey, uriVarValue) -> {
int equalsIndex = uriVarValue.indexOf('=');
if (equalsIndex == -1) {
return;
}
int semicolonIndex = uriVarValue.indexOf(';');
if (semicolonIndex != -1 && semicolonIndex != 0) {
uriVariables.put(uriVarKey, uriVarValue.substring(0, semicolonIndex));
}
String matrixVariables;
if (semicolonIndex == -1 || semicolonIndex == 0 || equalsIndex < semicolonIndex) {
matrixVariables = uriVarValue;
}
else {
matrixVariables = uriVarValue.substring(semicolonIndex + 1);
}
MultiValueMap vars = WebUtils.parseMatrixVariables(matrixVariables);
result.put(uriVarKey, getUrlPathHelper().decodeMatrixVariables(request, vars));
});
return result;
}
/**
* Iterate all RequestMappingInfo's once again, look if any match by URL at
* least and raise exceptions according to what doesn't match.
* @throws HttpRequestMethodNotSupportedException if there are matches by URL
* but not by HTTP method
* @throws HttpMediaTypeNotAcceptableException if there are matches by URL
* but not by consumable/producible media types
*/
@Override
protected HandlerMethod handleNoMatch(
Set infos, String lookupPath, HttpServletRequest request) throws ServletException {
PartialMatchHelper helper = new PartialMatchHelper(infos, request);
if (helper.isEmpty()) {
return null;
}
if (helper.hasMethodsMismatch()) {
Set methods = helper.getAllowedMethods();
if (HttpMethod.OPTIONS.matches(request.getMethod())) {
HttpOptionsHandler handler = new HttpOptionsHandler(methods);
return new HandlerMethod(handler, HTTP_OPTIONS_HANDLE_METHOD);
}
throw new HttpRequestMethodNotSupportedException(request.getMethod(), methods);
}
if (helper.hasConsumesMismatch()) {
Set mediaTypes = helper.getConsumableMediaTypes();
MediaType contentType = null;
if (StringUtils.hasLength(request.getContentType())) {
try {
contentType = MediaType.parseMediaType(request.getContentType());
}
catch (InvalidMediaTypeException ex) {
throw new HttpMediaTypeNotSupportedException(ex.getMessage());
}
}
throw new HttpMediaTypeNotSupportedException(contentType, new ArrayList<>(mediaTypes));
}
if (helper.hasProducesMismatch()) {
Set mediaTypes = helper.getProducibleMediaTypes();
throw new HttpMediaTypeNotAcceptableException(new ArrayList<>(mediaTypes));
}
if (helper.hasParamsMismatch()) {
List conditions = helper.getParamConditions();
throw new UnsatisfiedServletRequestParameterException(conditions, request.getParameterMap());
}
return null;
}
/**
* Aggregate all partial matches and expose methods checking across them.
*/
private static class PartialMatchHelper {
private final List partialMatches = new ArrayList<>();
public PartialMatchHelper(Set infos, HttpServletRequest request) {
for (RequestMappingInfo info : infos) {
if (info.getPatternsCondition().getMatchingCondition(request) != null) {
this.partialMatches.add(new PartialMatch(info, request));
}
}
}
/**
* Whether there any partial matches.
*/
public boolean isEmpty() {
return this.partialMatches.isEmpty();
}
/**
* Any partial matches for "methods"?
*/
public boolean hasMethodsMismatch() {
for (PartialMatch match : this.partialMatches) {
if (match.hasMethodsMatch()) {
return false;
}
}
return true;
}
/**
* Any partial matches for "methods" and "consumes"?
*/
public boolean hasConsumesMismatch() {
for (PartialMatch match : this.partialMatches) {
if (match.hasConsumesMatch()) {
return false;
}
}
return true;
}
/**
* Any partial matches for "methods", "consumes", and "produces"?
*/
public boolean hasProducesMismatch() {
for (PartialMatch match : this.partialMatches) {
if (match.hasProducesMatch()) {
return false;
}
}
return true;
}
/**
* Any partial matches for "methods", "consumes", "produces", and "params"?
*/
public boolean hasParamsMismatch() {
for (PartialMatch match : this.partialMatches) {
if (match.hasParamsMatch()) {
return false;
}
}
return true;
}
/**
* Return declared HTTP methods.
*/
public Set getAllowedMethods() {
Set result = new LinkedHashSet<>();
for (PartialMatch match : this.partialMatches) {
for (RequestMethod method : match.getInfo().getMethodsCondition().getMethods()) {
result.add(method.name());
}
}
return result;
}
/**
* Return declared "consumable" types but only among those that also
* match the "methods" condition.
*/
public Set getConsumableMediaTypes() {
Set result = new LinkedHashSet<>();
for (PartialMatch match : this.partialMatches) {
if (match.hasMethodsMatch()) {
result.addAll(match.getInfo().getConsumesCondition().getConsumableMediaTypes());
}
}
return result;
}
/**
* Return declared "producible" types but only among those that also
* match the "methods" and "consumes" conditions.
*/
public Set getProducibleMediaTypes() {
Set result = new LinkedHashSet<>();
for (PartialMatch match : this.partialMatches) {
if (match.hasConsumesMatch()) {
result.addAll(match.getInfo().getProducesCondition().getProducibleMediaTypes());
}
}
return result;
}
/**
* Return declared "params" conditions but only among those that also
* match the "methods", "consumes", and "params" conditions.
*/
public List getParamConditions() {
List result = new ArrayList<>();
for (PartialMatch match : this.partialMatches) {
if (match.hasProducesMatch()) {
Set> set = match.getInfo().getParamsCondition().getExpressions();
if (!CollectionUtils.isEmpty(set)) {
int i = 0;
String[] array = new String[set.size()];
for (NameValueExpression expression : set) {
array[i++] = expression.toString();
}
result.add(array);
}
}
}
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 request the current request
*/
public PartialMatch(RequestMappingInfo info, HttpServletRequest request) {
this.info = info;
this.methodsMatch = (info.getMethodsCondition().getMatchingCondition(request) != null);
this.consumesMatch = (info.getConsumesCondition().getMatchingCondition(request) != null);
this.producesMatch = (info.getProducesCondition().getMatchingCondition(request) != null);
this.paramsMatch = (info.getParamsCondition().getMatchingCondition(request) != 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 declaredMethods) {
this.headers.setAllow(initAllowedHttpMethods(declaredMethods));
}
private static Set initAllowedHttpMethods(Set declaredMethods) {
Set result = new LinkedHashSet<>(declaredMethods.size());
if (declaredMethods.isEmpty()) {
for (HttpMethod method : HttpMethod.values()) {
if (method != HttpMethod.TRACE) {
result.add(method);
}
}
}
else {
for (String method : declaredMethods) {
HttpMethod httpMethod = HttpMethod.valueOf(method);
result.add(httpMethod);
if (httpMethod == HttpMethod.GET) {
result.add(HttpMethod.HEAD);
}
}
result.add(HttpMethod.OPTIONS);
}
return result;
}
@SuppressWarnings("unused")
public HttpHeaders handle() {
return this.headers;
}
}
}
