1 /*
2 * Copyright (c) 1995, 2006, 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 sun.awt.image;
27
28 import java.io.InputStream;
29 import java.io.IOException;
30 import java.net.HttpURLConnection;
31 import java.net.URL;
32 import java.net.URLConnection;
33 import java.net.MalformedURLException;
34 import sun.net.util.URLUtil;
35
36 public class URLImageSource extends InputStreamImageSource {
37 URL url;
38 URLConnection conn;
39 String actualHost;
40 int actualPort;
41
42 public URLImageSource(URL u) {
43 SecurityManager sm = System.getSecurityManager();
44 if (sm != null) {
45 try {
46 java.security.Permission perm =
47 URLUtil.getConnectPermission(u);
48 if (perm != null) {
49 try {
50 sm.checkPermission(perm);
51 } catch (SecurityException se) {
52 // fallback to checkRead/checkConnect for pre 1.2
53 // security managers
54 if ((perm instanceof java.io.FilePermission) &&
55 perm.getActions().indexOf("read") != -1) {
56 sm.checkRead(perm.getName());
57 } else if ((perm instanceof
58 java.net.SocketPermission) &&
59 perm.getActions().indexOf("connect") != -1) {
60 sm.checkConnect(u.getHost(), u.getPort());
61 } else {
62 throw se;
63 }
64 }
65 }
66 } catch (java.io.IOException ioe) {
67 sm.checkConnect(u.getHost(), u.getPort());
68 }
69 }
70 this.url = u;
71
72 }
73
74 public URLImageSource(String href) throws MalformedURLException {
75 this(new URL(null, href));
76 }
77
78 public URLImageSource(URL u, URLConnection uc) {
79 this(u);
80 conn = uc;
81 }
82
83 public URLImageSource(URLConnection uc) {
84 this(uc.getURL(), uc);
85 }
86
87 final boolean checkSecurity(Object context, boolean quiet) {
88 // If actualHost is not null, then the host/port parameters that
89 // the image was actually fetched from were different than the
90 // host/port parameters the original URL specified for at least
91 // one of the download attempts. The original URL security was
92 // checked when the applet got a handle to the image, so we only
93 // need to check for the real host/port.
94 if (actualHost != null) {
95 try {
96 SecurityManager security = System.getSecurityManager();
97 if (security != null) {
98 security.checkConnect(actualHost, actualPort, context);
99 }
100 } catch (SecurityException e) {
101 if (!quiet) {
102 throw e;
103 }
104 return false;
105 }
106 }
107 return true;
108 }
109
110 private synchronized URLConnection getConnection() throws IOException {
111 URLConnection c;
112 if (conn != null) {
113 c = conn;
114 conn = null;
115 } else {
116 c = url.openConnection();
117 }
118 return c;
119 }
120
121 protected ImageDecoder getDecoder() {
122 InputStream is = null;
123 String type = null;
124 URLConnection c = null;
125 try {
126 c = getConnection();
127 is = c.getInputStream();
128 type = c.getContentType();
129 URL u = c.getURL();
130 if (u != url && (!u.getHost().equals(url.getHost()) ||
131 u.getPort() != url.getPort()))
132 {
133 // The image is allowed to come from either the host/port
134 // listed in the original URL, or it can come from one other
135 // host/port that the URL is redirected to. More than that
136 // and we give up and just throw a SecurityException.
137 if (actualHost != null && (!actualHost.equals(u.getHost()) ||
138 actualPort != u.getPort()))
139 {
140 throw new SecurityException("image moved!");
141 }
142 actualHost = u.getHost();
143 actualPort = u.getPort();
144 }
145 } catch (IOException e) {
146 if (is != null) {
147 try {
148 is.close();
149 } catch (IOException e2) {
150 }
151 } else if (c instanceof HttpURLConnection) {
152 ((HttpURLConnection)c).disconnect();
153 }
154 return null;
155 }
156
157 ImageDecoder id = decoderForType(is, type);
158 if (id == null) {
159 id = getDecoder(is);
160 }
161
162 if (id == null) {
163 // probably, no appropriate decoder
164 if (is != null) {
165 try {
166 is.close();
167 } catch (IOException e) {
168 }
169 } else if (c instanceof HttpURLConnection) {
170 ((HttpURLConnection)c).disconnect();
171 }
172 }
173 return id;
174 }
175 }