1 /*
2 * JBoss, Home of Professional Open Source.
3 * Copyright 2019 Red Hat, Inc., and individual contributors
4 * as indicated by the @author tags.
5 *
6 * Licensed under the Apache License, Version 2.0 (the "License");
7 * you may not use this file except in compliance with the License.
8 * You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 */
18
19 package io.undertow.servlet.handlers;
20
21 import io.undertow.server.HttpHandler;
22 import io.undertow.server.HttpServerExchange;
23 import io.undertow.util.Headers;
24 import io.undertow.util.Methods;
25 import io.undertow.util.RedirectBuilder;
26 import io.undertow.util.StatusCodes;
27
28 /**
29 * Handler that redirects the directory requests without trailing slash to the one append trailing slash.
30 *
31 * @author Lin Gao
32 */
33 public class RedirectDirHandler implements HttpHandler {
34
35 private static final String HTTP2_UPGRADE_PREFIX = "h2";
36
37 private final HttpHandler next;
38 private final ServletPathMatches paths;
39
40 public RedirectDirHandler(HttpHandler next, ServletPathMatches paths) {
41 this.next = next;
42 this.paths = paths;
43 }
44
45 @Override
46 public void handleRequest(HttpServerExchange exchange) throws Exception {
47 final String path = exchange.getRelativePath();
48 final ServletPathMatch info = paths.getServletHandlerByPath(path);
49 // https://issues.jboss.org/browse/WFLY-3439
50 // if the request is an upgrade request then we don't want to redirect
51 // as there is a good chance the web socket client won't understand the redirect
52 // we make an exception for HTTP2 upgrade requests, as this would have already be handled at
53 // the connector level if it was going to be handled.
54 String upgradeString = exchange.getRequestHeaders().getFirst(Headers.UPGRADE);
55 boolean isUpgradeRequest = upgradeString != null && !upgradeString.startsWith(HTTP2_UPGRADE_PREFIX);
56 if (info.getType() == ServletPathMatch.Type.REDIRECT && !isUpgradeRequest) {
57 // UNDERTOW-89
58 // we redirect on GET requests to the root context to add an / to the end
59 if (exchange.getRequestMethod().equals(Methods.GET) || exchange.getRequestMethod().equals(Methods.HEAD)) {
60 exchange.setStatusCode(StatusCodes.FOUND);
61 } else {
62 exchange.setStatusCode(StatusCodes.TEMPORARY_REDIRECT);
63 }
64 exchange.getResponseHeaders().put(Headers.LOCATION,
65 RedirectBuilder.redirect(exchange, exchange.getRelativePath() + "/", true));
66 return;
67 }
68 next.handleRequest(exchange);
69 }
70
71 }
72