jakarta.mail.internet.MimeUtil Maven / Gradle / Ivy
/*
* Copyright (c) 2010, 2023 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package jakarta.mail.internet;
import java.lang.reflect.Method;
import java.security.AccessController;
import java.security.PrivilegedAction;
/**
* General MIME-related utility methods.
*
* @author Bill Shannon
* @since JavaMail 1.4.4
*/
class MimeUtil {
private static final Method cleanContentType;
static {
Method meth = null;
try {
String cth = System.getProperty("mail.mime.contenttypehandler");
if (cth != null) {
ClassLoader cl = getContextClassLoader();
Class clsHandler = null;
if (cl != null) {
try {
clsHandler = Class.forName(cth, false, cl);
} catch (ClassNotFoundException cex) {
}
}
if (clsHandler == null)
clsHandler = Class.forName(cth);
meth = clsHandler.getMethod("cleanContentType",
MimePart.class, String.class);
}
} catch (ClassNotFoundException | RuntimeException | NoSuchMethodException ex) {
// ignore it
} finally {
cleanContentType = meth;
}
}
// No one should instantiate this class.
private MimeUtil() {
}
/**
* If a Content-Type handler has been specified,
* call it to clean up the Content-Type value.
*
* @param mp the MimePart
* @param contentType the Content-Type value
* @return the cleaned Content-Type value
*/
public static String cleanContentType(MimePart mp, String contentType) {
if (cleanContentType != null) {
try {
return (String) cleanContentType.invoke(null,
new Object[]{mp, contentType});
} catch (Exception ex) {
return contentType;
}
} else
return contentType;
}
/**
* Convenience method to get our context class loader.
* Assert any privileges we might have and then call the
* Thread.getContextClassLoader method.
*/
private static ClassLoader getContextClassLoader() {
return
AccessController.doPrivileged(new PrivilegedAction() {
@Override
public ClassLoader run() {
ClassLoader cl = null;
try {
cl = Thread.currentThread().getContextClassLoader();
} catch (SecurityException ex) {
}
return cl;
}
});
}
}