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/*
* JBoss, Home of Professional Open Source.
* Copyright 2014 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* 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
*
* http://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 io.undertow.server;
import io.undertow.predicate.Predicate;
import io.undertow.server.handlers.ResponseCodeHandler;
import io.undertow.util.CopyOnWriteMap;
import io.undertow.util.HttpString;
import io.undertow.util.Methods;
import io.undertow.util.PathTemplate;
import io.undertow.util.PathTemplateMatch;
import io.undertow.util.PathTemplateMatcher;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.concurrent.CopyOnWriteArrayList;
/**
* A Handler that handles the common case of routing via path template and method name.
*
* @author Stuart Douglas
*/
public class RoutingHandler implements HttpHandler {
// Matcher objects grouped by http methods.
private final Map> matches = new CopyOnWriteMap<>();
// Matcher used to find if this instance contains matches for any http method for a path.
// This matcher is used to report if this instance can match a path for one of the http methods.
private final PathTemplateMatcher allMethodsMatcher = new PathTemplateMatcher<>();
// Handler called when no match was found and invalid method handler can't be invoked.
private volatile HttpHandler fallbackHandler = ResponseCodeHandler.HANDLE_404;
// Handler called when this instance can not match the http method but can match another http method.
// For example: For an exchange the POST method is not matched by this instance but at least one http method is
// matched for the same exchange.
// If this handler is null the fallbackHandler will be used.
private volatile HttpHandler invalidMethodHandler = ResponseCodeHandler.HANDLE_405;
// If this is true then path matches will be added to the query parameters for easy access by later handlers.
private final boolean rewriteQueryParameters;
public RoutingHandler(boolean rewriteQueryParameters) {
this.rewriteQueryParameters = rewriteQueryParameters;
}
public RoutingHandler() {
this.rewriteQueryParameters = true;
}
@Override
public void handleRequest(HttpServerExchange exchange) throws Exception {
PathTemplateMatcher matcher = matches.get(exchange.getRequestMethod());
if (matcher == null) {
handleNoMatch(exchange);
return;
}
PathTemplateMatcher.PathMatchResult match = matcher.match(exchange.getRelativePath());
if (match == null) {
handleNoMatch(exchange);
return;
}
exchange.putAttachment(PathTemplateMatch.ATTACHMENT_KEY, match);
if (rewriteQueryParameters) {
for (Map.Entry entry : match.getParameters().entrySet()) {
exchange.addQueryParam(entry.getKey(), entry.getValue());
}
}
for (HandlerHolder handler : match.getValue().predicatedHandlers) {
if (handler.predicate.resolve(exchange)) {
handler.handler.handleRequest(exchange);
return;
}
}
if (match.getValue().defaultHandler != null) {
match.getValue().defaultHandler.handleRequest(exchange);
} else {
fallbackHandler.handleRequest(exchange);
}
}
/**
* Handles the case in with a match was not found for the http method but might exist for another http method.
* For example: POST not matched for a path but at least one match exists for same path.
*
* @param exchange The object for which its handled the "no match" case.
* @throws Exception
*/
private void handleNoMatch(final HttpServerExchange exchange) throws Exception {
// if invalidMethodHandler is null we fail fast without matching with allMethodsMatcher
if (invalidMethodHandler != null && allMethodsMatcher.match(exchange.getRelativePath()) != null) {
invalidMethodHandler.handleRequest(exchange);
return;
}
fallbackHandler.handleRequest(exchange);
}
public synchronized RoutingHandler add(final String method, final String template, HttpHandler handler) {
return add(new HttpString(method), template, handler);
}
public synchronized RoutingHandler add(HttpString method, String template, HttpHandler handler) {
PathTemplateMatcher matcher = matches.get(method);
if (matcher == null) {
matches.put(method, matcher = new PathTemplateMatcher<>());
}
RoutingMatch res = matcher.get(template);
if (res == null) {
matcher.add(template, res = new RoutingMatch());
}
if (allMethodsMatcher.match(template) == null) {
allMethodsMatcher.add(template, res);
}
res.defaultHandler = handler;
return this;
}
public synchronized RoutingHandler get(final String template, HttpHandler handler) {
return add(Methods.GET, template, handler);
}
public synchronized RoutingHandler post(final String template, HttpHandler handler) {
return add(Methods.POST, template, handler);
}
public synchronized RoutingHandler put(final String template, HttpHandler handler) {
return add(Methods.PUT, template, handler);
}
public synchronized RoutingHandler delete(final String template, HttpHandler handler) {
return add(Methods.DELETE, template, handler);
}
public synchronized RoutingHandler add(final String method, final String template, Predicate predicate, HttpHandler handler) {
return add(new HttpString(method), template, predicate, handler);
}
public synchronized RoutingHandler add(HttpString method, String template, Predicate predicate, HttpHandler handler) {
PathTemplateMatcher matcher = matches.get(method);
if (matcher == null) {
matches.put(method, matcher = new PathTemplateMatcher<>());
}
RoutingMatch res = matcher.get(template);
if (res == null) {
matcher.add(template, res = new RoutingMatch());
}
if (allMethodsMatcher.match(template) == null) {
allMethodsMatcher.add(template, res);
}
res.predicatedHandlers.add(new HandlerHolder(predicate, handler));
return this;
}
public synchronized RoutingHandler get(final String template, Predicate predicate, HttpHandler handler) {
return add(Methods.GET, template, predicate, handler);
}
public synchronized RoutingHandler post(final String template, Predicate predicate, HttpHandler handler) {
return add(Methods.POST, template, predicate, handler);
}
public synchronized RoutingHandler put(final String template, Predicate predicate, HttpHandler handler) {
return add(Methods.PUT, template, predicate, handler);
}
public synchronized RoutingHandler delete(final String template, Predicate predicate, HttpHandler handler) {
return add(Methods.DELETE, template, predicate, handler);
}
public synchronized RoutingHandler addAll(RoutingHandler routingHandler) {
for (Entry> entry : routingHandler.getMatches().entrySet()) {
HttpString method = entry.getKey();
PathTemplateMatcher matcher = matches.get(method);
if (matcher == null) {
matches.put(method, matcher = new PathTemplateMatcher<>());
}
matcher.addAll(entry.getValue());
// If we use allMethodsMatcher.addAll() we can have duplicate
// PathTemplates which we want to ignore here so it does not crash.
for (PathTemplate template : entry.getValue().getPathTemplates()) {
if (allMethodsMatcher.match(template.getTemplateString()) == null) {
allMethodsMatcher.add(template, new RoutingMatch());
}
}
}
return this;
}
/**
*
* Removes the specified route from the handler
*
* @param method The method to remove
* @param path the path tempate to remove
* @return this handler
*/
public RoutingHandler remove(HttpString method, String path) {
PathTemplateMatcher handler = matches.get(method);
if(handler != null) {
handler.remove(path);
}
return this;
}
/**
*
* Removes the specified route from the handler
*
* @param path the path tempate to remove
* @return this handler
*/
public RoutingHandler remove(String path) {
allMethodsMatcher.remove(path);
return this;
}
Map> getMatches() {
return matches;
}
/**
* @return Handler called when no match was found and invalid method handler can't be invoked.
*/
public HttpHandler getFallbackHandler() {
return fallbackHandler;
}
/**
* @param fallbackHandler Handler that will be called when no match was found and invalid method handler can't be
* invoked.
* @return This instance.
*/
public RoutingHandler setFallbackHandler(HttpHandler fallbackHandler) {
this.fallbackHandler = fallbackHandler;
return this;
}
/**
* @return Handler called when this instance can not match the http method but can match another http method.
*/
public HttpHandler getInvalidMethodHandler() {
return invalidMethodHandler;
}
/**
* Sets the handler called when this instance can not match the http method but can match another http method.
* For example: For an exchange the POST method is not matched by this instance but at least one http method matched
* for the exchange.
* If this handler is null the fallbackHandler will be used.
*
* @param invalidMethodHandler Handler that will be called when this instance can not match the http method but can
* match another http method.
* @return This instance.
*/
public RoutingHandler setInvalidMethodHandler(HttpHandler invalidMethodHandler) {
this.invalidMethodHandler = invalidMethodHandler;
return this;
}
private static class RoutingMatch {
final List predicatedHandlers = new CopyOnWriteArrayList<>();
volatile HttpHandler defaultHandler;
}
private static class HandlerHolder {
final Predicate predicate;
final HttpHandler handler;
private HandlerHolder(Predicate predicate, HttpHandler handler) {
this.predicate = predicate;
this.handler = handler;
}
}
}
