/*
* 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
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*/
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;
}
}