/*
* @(#)URLImageSource.java 1.11 95/12/08 Jim Graham
*
* Copyright (c) 1994 Sun Microsystems, Inc. All Rights Reserved.
*
* Permission to use, copy, modify, and distribute this software
* and its documentation for NON-COMMERCIAL purposes and without
* fee is hereby granted provided that this copyright notice
* appears in all copies. Please refer to the file "copyright.html"
* for further important copyright and licensing information.
*
* SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF
* THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
* TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR
* ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
* DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES.
*/
package sun.awt.image;
import java.io.InputStream;
import java.io.IOException;
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) {
sm.checkConnect(u.getHost(), u.getPort());
}
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 {
System.getSecurityManager().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;
try {
URLConnection c = getConnection();
is = c.getInputStream();
type = c.getContentType();
URL u = c.getURL();
if (u != url && (u.getHost() != 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 != 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) {
}
}
return null;
}
ImageDecoder id = decoderForType(is, type);
if (id == null) {
id = getDecoder(is);
}
return id;
}
}