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
26package sun.awt.image;
27
28import java.io.InputStream;
29import java.io.IOException;
30import java.net.HttpURLConnection;
31import java.net.URL;
32import java.net.URLConnection;
33import java.net.MalformedURLException;
34import sun.net.util.URLUtil;
35
36public 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}
176