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 sm.checkPermission(perm);
50 }
51 } catch (java.io.IOException ioe) {
52 sm.checkConnect(u.getHost(), u.getPort());
53 }
54 }
55 this.url = u;
56
57 }
58
59 public URLImageSource(String href) throws MalformedURLException {
60 this(new URL(null, href));
61 }
62
63 public URLImageSource(URL u, URLConnection uc) {
64 this(u);
65 conn = uc;
66 }
67
68 public URLImageSource(URLConnection uc) {
69 this(uc.getURL(), uc);
70 }
71
72 final boolean checkSecurity(Object context, boolean quiet) {
73 // If actualHost is not null, then the host/port parameters that
74 // the image was actually fetched from were different than the
75 // host/port parameters the original URL specified for at least
76 // one of the download attempts. The original URL security was
77 // checked when the applet got a handle to the image, so we only
78 // need to check for the real host/port.
79 if (actualHost != null) {
80 try {
81 SecurityManager security = System.getSecurityManager();
82 if (security != null) {
83 security.checkConnect(actualHost, actualPort, context);
84 }
85 } catch (SecurityException e) {
86 if (!quiet) {
87 throw e;
88 }
89 return false;
90 }
91 }
92 return true;
93 }
94
95 private synchronized URLConnection getConnection() throws IOException {
96 URLConnection c;
97 if (conn != null) {
98 c = conn;
99 conn = null;
100 } else {
101 c = url.openConnection();
102 }
103 return c;
104 }
105
106 protected ImageDecoder getDecoder() {
107 InputStream is = null;
108 String type = null;
109 URLConnection c = null;
110 try {
111 c = getConnection();
112 is = c.getInputStream();
113 type = c.getContentType();
114 URL u = c.getURL();
115 if (u != url && (!u.getHost().equals(url.getHost()) ||
116 u.getPort() != url.getPort()))
117 {
118 // The image is allowed to come from either the host/port
119 // listed in the original URL, or it can come from one other
120 // host/port that the URL is redirected to. More than that
121 // and we give up and just throw a SecurityException.
122 if (actualHost != null && (!actualHost.equals(u.getHost()) ||
123 actualPort != u.getPort()))
124 {
125 throw new SecurityException("image moved!");
126 }
127 actualHost = u.getHost();
128 actualPort = u.getPort();
129 }
130 } catch (IOException e) {
131 if (is != null) {
132 try {
133 is.close();
134 } catch (IOException e2) {
135 }
136 } else if (c instanceof HttpURLConnection) {
137 ((HttpURLConnection)c).disconnect();
138 }
139 return null;
140 }
141
142 ImageDecoder id = decoderForType(is, type);
143 if (id == null) {
144 id = getDecoder(is);
145 }
146
147 if (id == null) {
148 // probably, no appropriate decoder
149 if (is != null) {
150 try {
151 is.close();
152 } catch (IOException e) {
153 }
154 } else if (c instanceof HttpURLConnection) {
155 ((HttpURLConnection)c).disconnect();
156 }
157 }
158 return id;
159 }
160 }