/* * Copyright (c) 1995, 2006, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation.  Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package sun.awt.image; import java.io.InputStream;import java.io.IOException;import java.net.HttpURLConnection;import java.net.URL;import java.net.URLConnection;import java.net.MalformedURLException; public class URLImageSource extends InputStreamImageSource {    URL url;    URLConnection conn;    String actualHost;    int actualPort;     public URLImageSource(URL u) {        SecurityManager sm = System.getSecurityManager();        if (sm != null) {            try {                java.security.Permission perm =                    u.openConnection().getPermission();                if (perm != null) {                    try {                        sm.checkPermission(perm);                    } catch (SecurityException se) {                        // fallback to checkRead/checkConnect for pre 1.2                        // security managers                        if ((perm instanceof java.io.FilePermission) &&                                perm.getActions().indexOf("read") != -1) {                            sm.checkRead(perm.getName());                        } else if ((perm instanceof                                java.net.SocketPermission) &&                                perm.getActions().indexOf("connect") != -1) {                            sm.checkConnect(u.getHost(), u.getPort());                        } else {                            throw se;                        }                    }                }            } catch (java.io.IOException ioe) {                    sm.checkConnect(u.getHost(), u.getPort());            }        }        this.url = u;     }     public URLImageSource(String href) throws MalformedURLException {        this(new URL(null, href));    }     public URLImageSource(URL u, URLConnection uc) {        this(u);        conn = uc;    }     public URLImageSource(URLConnection uc) {        this(uc.getURL(), uc);    }     final boolean checkSecurity(Object context, boolean quiet) {        // If actualHost is not null, then the host/port parameters that        // the image was actually fetched from were different than the        // host/port parameters the original URL specified for at least        // one of the download attempts.  The original URL security was        // checked when the applet got a handle to the image, so we only        // need to check for the real host/port.        if (actualHost != null) {            try {                SecurityManager security = System.getSecurityManager();                if (security != null) {                    security.checkConnect(actualHost, actualPort, context);                }            } catch (SecurityException e) {                if (!quiet) {                    throw e;                }                return false;            }        }        return true;    }     private synchronized URLConnection getConnection() throws IOException {        URLConnection c;        if (conn != null) {            c = conn;            conn = null;        } else {            c = url.openConnection();        }        return c;    }     protected ImageDecoder getDecoder() {        InputStream is = null;        String type = null;        URLConnection c = null;        try {            c = getConnection();            is = c.getInputStream();            type = c.getContentType();            URL u = c.getURL();            if (u != url && (!u.getHost().equals(url.getHost()) ||                             u.getPort() != url.getPort()))            {                // The image is allowed to come from either the host/port                // listed in the original URL, or it can come from one other                // host/port that the URL is redirected to.  More than that                // and we give up and just throw a SecurityException.                if (actualHost != null && (!actualHost.equals(u.getHost()) ||                                           actualPort != u.getPort()))                {                    throw new SecurityException("image moved!");                }                actualHost = u.getHost();                actualPort = u.getPort();            }        } catch (IOException e) {            if (is != null) {                try {                    is.close();                } catch (IOException e2) {                }            } else if (c instanceof HttpURLConnection) {                ((HttpURLConnection)c).disconnect();            }            return null;        }         ImageDecoder id = decoderForType(is, type);        if (id == null) {            id = getDecoder(is);        }         if (id == null) {            // probably, no appropriate decoder            if  (is != null) {                try {                    is.close();                } catch (IOException e) {                }            } else if (c instanceof HttpURLConnection) {                ((HttpURLConnection)c).disconnect();            }        }        return id;    }}