META-INF.modules.java.desktop.classes.com.sun.media.sound.JSSecurityManager Maven / Gradle / Ivy
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package com.sun.media.sound;
import java.io.Reader;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Properties;
import java.util.ServiceLoader;
import javax.sound.sampled.AudioPermission;
/** Managing security in the Java Sound implementation.
* This class contains all code that uses and is used by
* SecurityManager.doPrivileged().
*
* @author Matthias Pfisterer
*/
final class JSSecurityManager {
/** Prevent instantiation.
*/
private JSSecurityManager() {
}
static void checkRecordPermission() throws SecurityException {
@SuppressWarnings("removal")
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
sm.checkPermission(new AudioPermission("record"));
}
}
/**
* Load properties from a file.
*
* This method tries to load properties from the filename give into the
* passed properties object. If the file cannot be found or something else
* goes wrong, the method silently fails.
*
* If the file referenced in "javax.sound.config.file" property exists and
* the user has an access to it, then it will be loaded, otherwise default
* configuration file "JAVA_HOME/conf/sound.properties" will be loaded.
*
* @param properties the properties bundle to store the values of the
* properties file
*/
@SuppressWarnings("removal")
static void loadProperties(final Properties properties) {
final String customFile = AccessController.doPrivileged(
(PrivilegedAction) () -> System.getProperty(
"javax.sound.config.file"));
if (customFile != null) {
if (loadPropertiesImpl(properties, customFile)) {
return;
}
}
AccessController.doPrivileged((PrivilegedAction) () -> {
final String home = System.getProperty("java.home");
if (home == null) {
throw new Error("Can't find java.home ??");
}
loadPropertiesImpl(properties, home, "conf", "sound.properties");
return null;
});
}
private static boolean loadPropertiesImpl(final Properties properties,
String first, String... more) {
final Path fname = Paths.get(first, more);
try (final Reader reader = Files.newBufferedReader(fname)) {
properties.load(reader);
return true;
} catch (final Throwable t) {
return false;
}
}
/** Create a Thread in the current ThreadGroup.
*/
static Thread createThread(final Runnable runnable,
final String threadName,
final boolean isDaemon, final int priority,
final boolean doStart)
{
Thread thread = new Thread(null, runnable, threadName, 0, false);
thread.setDaemon(isDaemon);
if (priority >= 0) {
thread.setPriority(priority);
}
if (doStart) {
thread.start();
}
return thread;
}
@SuppressWarnings("removal")
static synchronized List getProviders(final Class providerClass) {
List p = new ArrayList<>(7);
// ServiceLoader creates "lazy" iterator instance, but it ensures that
// next/hasNext run with permissions that are restricted by whatever
// creates the ServiceLoader instance, so it requires to be called from
// privileged section
final PrivilegedAction> psAction =
new PrivilegedAction>() {
@Override
public Iterator run() {
return ServiceLoader.load(providerClass).iterator();
}
};
final Iterator ps = AccessController.doPrivileged(psAction);
// the iterator's hasNext() method looks through classpath for
// the provider class names, so it requires read permissions
PrivilegedAction hasNextAction = new PrivilegedAction() {
@Override
public Boolean run() {
return ps.hasNext();
}
};
while (AccessController.doPrivileged(hasNextAction)) {
try {
// the iterator's next() method creates instances of the
// providers and it should be called in the current security
// context
T provider = ps.next();
if (providerClass.isInstance(provider)) {
// $$mp 2003-08-22
// Always adding at the beginning reverses the
// order of the providers. So we no longer have
// to do this in AudioSystem and MidiSystem.
p.add(0, provider);
}
} catch (Throwable t) {
//$$fb 2002-11-07: do not fail on SPI not found
if (Printer.err) t.printStackTrace();
}
}
return p;
}
}