1 /* |
|
2 * Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved. |
|
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
|
4 * |
|
5 * This code is free software; you can redistribute it and/or modify it |
|
6 * under the terms of the GNU General Public License version 2 only, as |
|
7 * published by the Free Software Foundation. Oracle designates this |
|
8 * particular file as subject to the "Classpath" exception as provided |
|
9 * by Oracle in the LICENSE file that accompanied this code. |
|
10 * |
|
11 * This code is distributed in the hope that it will be useful, but WITHOUT |
|
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
|
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
|
14 * version 2 for more details (a copy is included in the LICENSE file that |
|
15 * accompanied this code). |
|
16 * |
|
17 * You should have received a copy of the GNU General Public License version |
|
18 * 2 along with this work; if not, write to the Free Software Foundation, |
|
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
|
20 * |
|
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
|
22 * or visit www.oracle.com if you need additional information or have any |
|
23 * questions. |
|
24 */ |
|
25 |
|
26 package java.net.http.internal; |
|
27 |
|
28 import java.io.IOException; |
|
29 import java.io.UncheckedIOException; |
|
30 import java.net.URI; |
|
31 import java.net.http.HttpClient; |
|
32 import java.net.http.HttpHeaders; |
|
33 import java.net.http.internal.common.Utils; |
|
34 |
|
35 class RedirectFilter implements HeaderFilter { |
|
36 |
|
37 HttpRequestImpl request; |
|
38 HttpClientImpl client; |
|
39 HttpClient.Redirect policy; |
|
40 String method; |
|
41 MultiExchange<?> exchange; |
|
42 static final int DEFAULT_MAX_REDIRECTS = 5; |
|
43 URI uri; |
|
44 |
|
45 static final int max_redirects = Utils.getIntegerNetProperty( |
|
46 "jdk.httpclient.redirects.retrylimit", DEFAULT_MAX_REDIRECTS |
|
47 ); |
|
48 |
|
49 // A public no-arg constructor is required by FilterFactory |
|
50 public RedirectFilter() {} |
|
51 |
|
52 @Override |
|
53 public synchronized void request(HttpRequestImpl r, MultiExchange<?> e) throws IOException { |
|
54 this.request = r; |
|
55 this.client = e.client(); |
|
56 this.policy = client.followRedirects(); |
|
57 |
|
58 this.method = r.method(); |
|
59 this.uri = r.uri(); |
|
60 this.exchange = e; |
|
61 } |
|
62 |
|
63 @Override |
|
64 public synchronized HttpRequestImpl response(Response r) throws IOException { |
|
65 return handleResponse(r); |
|
66 } |
|
67 |
|
68 /** |
|
69 * checks to see if new request needed and returns it. |
|
70 * Null means response is ok to return to user. |
|
71 */ |
|
72 private HttpRequestImpl handleResponse(Response r) { |
|
73 int rcode = r.statusCode(); |
|
74 if (rcode == 200 || policy == HttpClient.Redirect.NEVER) { |
|
75 return null; |
|
76 } |
|
77 if (rcode >= 300 && rcode <= 399) { |
|
78 URI redir = getRedirectedURI(r.headers()); |
|
79 if (canRedirect(redir) && ++exchange.numberOfRedirects < max_redirects) { |
|
80 //System.out.println("Redirecting to: " + redir); |
|
81 return new HttpRequestImpl(redir, method, request); |
|
82 } else { |
|
83 //System.out.println("Redirect: giving up"); |
|
84 return null; |
|
85 } |
|
86 } |
|
87 return null; |
|
88 } |
|
89 |
|
90 private URI getRedirectedURI(HttpHeaders headers) { |
|
91 URI redirectedURI; |
|
92 redirectedURI = headers.firstValue("Location") |
|
93 .map(URI::create) |
|
94 .orElseThrow(() -> new UncheckedIOException( |
|
95 new IOException("Invalid redirection"))); |
|
96 |
|
97 // redirect could be relative to original URL, but if not |
|
98 // then redirect is used. |
|
99 redirectedURI = uri.resolve(redirectedURI); |
|
100 return redirectedURI; |
|
101 } |
|
102 |
|
103 private boolean canRedirect(URI redir) { |
|
104 String newScheme = redir.getScheme(); |
|
105 String oldScheme = uri.getScheme(); |
|
106 switch (policy) { |
|
107 case ALWAYS: |
|
108 return true; |
|
109 case NEVER: |
|
110 return false; |
|
111 case SECURE: |
|
112 return newScheme.equalsIgnoreCase("https"); |
|
113 case SAME_PROTOCOL: |
|
114 return newScheme.equalsIgnoreCase(oldScheme); |
|
115 default: |
|
116 throw new InternalError(); |
|
117 } |
|
118 } |
|
119 } |
|