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/**
* Copyright 2012 JogAmp Community. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are
* permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this list of
* conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice, this list
* of conditions and the following disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY JogAmp Community ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JogAmp Community OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* The views and conclusions contained in the software and documentation are those of the
* authors and should not be interpreted as representing official policies, either expressed
* or implied, of JogAmp Community.
*/
package com.jogamp.common.util;
import java.security.*;
import java.util.HashSet;
/** Helper routines for accessing properties. */
public class PropertyAccess {
/** trusted build-in property prefix 'jnlp.' */
public static final String jnlp_prefix = "jnlp." ;
/** trusted build-in property prefix 'javaws.' */
public static final String javaws_prefix = "javaws.";
static final HashSet<String> trustedPrefixes;
static {
trustedPrefixes = new HashSet<String>();
trustedPrefixes.add(javaws_prefix);
trustedPrefixes.add(jnlp_prefix);
// 'jogamp.' and maybe other trusted prefixes will be added later via 'addTrustedPrefix()'
}
public static final void addTrustedPrefix(String prefix, Class<?> certClass) {
if(SecurityUtil.equalsLocalCert(certClass)) {
trustedPrefixes.add(prefix);
} else {
throw new SecurityException("Illegal Access - prefix "+prefix+", with cert class "+certClass);
}
}
public static final boolean isTrusted(String propertyKey) {
final int dot1 = propertyKey.indexOf('.');
if(0<=dot1) {
return trustedPrefixes.contains(propertyKey.substring(0, dot1+1));
} else {
return false;
}
}
/** @see #getProperty(String, boolean, AccessControlContext) */
public static final int getIntProperty(final String property, final boolean jnlpAlias, final AccessControlContext acc, int defaultValue) {
int i=defaultValue;
try {
final String sv = PropertyAccess.getProperty(property, jnlpAlias, acc);
if(null!=sv) {
i = Integer.valueOf(sv).intValue();
}
} catch (NumberFormatException nfe) {}
return i;
}
/** @see #getProperty(String, boolean, AccessControlContext) */
public static final long getLongProperty(final String property, final boolean jnlpAlias, final AccessControlContext acc, long defaultValue) {
long l=defaultValue;
try {
final String sv = PropertyAccess.getProperty(property, jnlpAlias, acc);
if(null!=sv) {
l = Long.valueOf(sv).longValue();
}
} catch (NumberFormatException nfe) {}
return l;
}
/** @see #getProperty(String, boolean, AccessControlContext) */
public static final boolean getBooleanProperty(final String property, final boolean jnlpAlias, final AccessControlContext acc) {
return Boolean.valueOf(PropertyAccess.getProperty(property, jnlpAlias, acc)).booleanValue();
}
/** @see #getProperty(String, boolean, AccessControlContext) */
public static final boolean getBooleanProperty(final String property, final boolean jnlpAlias, final AccessControlContext acc, boolean defaultValue) {
final String valueS = PropertyAccess.getProperty(property, jnlpAlias, acc);
if(null != valueS) {
return Boolean.valueOf(valueS).booleanValue();
}
return defaultValue;
}
/** @see #getProperty(String, boolean, AccessControlContext) */
public static final boolean isPropertyDefined(final String property, final boolean jnlpAlias, final AccessControlContext acc) {
return (PropertyAccess.getProperty(property, jnlpAlias, acc) != null) ? true : false;
}
/**
* Query the property with the name <code>propertyKey</code>.
* <p>
* If <code>jnlpAlias</code> is <code>true</code> and the plain <code>propertyKey</code>
* could not be resolved, an attempt to resolve the JNLP aliased <i>trusted property</i> is made.<br>
* Example: For the propertyName <code>OneTwo</code>, the jnlp alias name is <code>jnlp.OneTwo</code>, which is considered trusted.<br>
* </p>
*
* @param propertyKey the property name to query.
* @param jnlpAlias true if a fallback attempt to query the JNLP aliased <i>trusted property</i> shall be made,
* otherwise false.
* @param acc the AccessControlerContext to be used for privileged access to the system property, or null.
*
* @return the property value if exists, or null
*
* @throws NullPointerException if the property name is null
* @throws IllegalArgumentException if the property name is of length 0
* @throws SecurityException if access is not allowed to the given <code>propertyKey</code>
*
* @see System#getProperty(String)
*/
public static final String getProperty(final String propertyKey, final boolean jnlpAlias, final AccessControlContext acc)
throws SecurityException, NullPointerException, IllegalArgumentException {
if(null == propertyKey) {
throw new NullPointerException("propertyKey is NULL");
}
if(0 == propertyKey.length()) {
throw new IllegalArgumentException("propertyKey is empty");
}
String s=null;
// int cause = 0;
if( isTrusted(propertyKey) ) {
// 'trusted' property (jnlp., javaws., jogamp., ..)
s = getTrustedPropKey(propertyKey);
// cause = null != s ? 1 : 0;
} else {
if( null != acc ) {
s = AccessController.doPrivileged(new PrivilegedAction<String>() {
public String run() {
return System.getProperty(propertyKey);
} }, acc);
// cause = null != s ? 2 : 0;
} else {
s = System.getProperty(propertyKey);
// cause = null != s ? 3 : 0;
}
}
if( null == s && jnlpAlias ) {
// Try 'jnlp.' aliased property ..
if( !propertyKey.startsWith(jnlp_prefix) ) {
// Properties within the namespace "jnlp." or "javaws." should be considered trusted,
// i.e. always granted w/o special privileges.
s = getTrustedPropKey(jnlp_prefix + propertyKey);
// cause = null != s ? 4 : 0;
}
}
// System.err.println("Prop: <"+propertyKey+"> = <"+s+">, cause "+cause);
return s;
}
private static final String getTrustedPropKey(final String propertyKey) {
return AccessController.doPrivileged(new PrivilegedAction<String>() {
public String run() {
try {
return System.getProperty(propertyKey);
} catch (SecurityException se) {
throw new SecurityException("Could not access trusted property '"+propertyKey+"'", se);
}
}
});
}
}
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