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package org.bouncycastle.util;
import java.math.BigInteger;
import java.security.AccessControlException;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.security.Security;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.StringTokenizer;
/**
* Utility method for accessing properties values - properties can be set in java.security,
* thread local, and system properties. They are checked for in the same order with
* checking stopped as soon as a value is found.
*/
public class Properties
{
/**
* If set the provider will attempt, where possible, to behave the same way as the oracle one.
*/
public static final String EMULATE_ORACLE = "org.bouncycastle.emulate.oracle";
private Properties()
{
}
private static final ThreadLocal threadProperties = new ThreadLocal();
/**
* Return whether a particular override has been set to true.
*
* @param propertyName the property name for the override.
* @return true if the property is set to "true", false otherwise.
*/
public static boolean isOverrideSet(String propertyName)
{
try
{
return isSetTrue(getPropertyValue(propertyName));
}
catch (AccessControlException e)
{
return false;
}
}
/**
* Return whether a particular override has been set to false.
*
* @param propertyName the property name for the override.
* @param isTrue true if the override should be true, false otherwise.
* @return true if the property is set to the value of isTrue, false otherwise.
*/
public static boolean isOverrideSetTo(String propertyName, boolean isTrue)
{
try
{
String propertyValue = getPropertyValue(propertyName);
if (isTrue)
{
return isSetTrue(propertyValue);
}
return isSetFalse(propertyValue);
}
catch (AccessControlException e)
{
return false;
}
}
/**
* Enable the specified override property for the current thread only.
*
* @param propertyName the property name for the override.
* @param enable true if the override should be enabled, false if it should be disabled.
* @return true if the override was already set true, false otherwise.
*/
public static boolean setThreadOverride(String propertyName, boolean enable)
{
boolean isSet = isOverrideSet(propertyName);
Map localProps = (Map)threadProperties.get();
if (localProps == null)
{
localProps = new HashMap();
threadProperties.set(localProps);
}
localProps.put(propertyName, enable ? "true" : "false");
return isSet;
}
/**
* Remove any value for the specified override property for the current thread only.
*
* @param propertyName the property name for the override.
* @return true if the override was already set true in thread local, false otherwise.
*/
public static boolean removeThreadOverride(String propertyName)
{
Map localProps = (Map)threadProperties.get();
if (localProps != null)
{
String p = (String)localProps.remove(propertyName);
if (p != null)
{
if (localProps.isEmpty())
{
threadProperties.remove();
}
return "true".equals(Strings.toLowerCase(p));
}
}
return false;
}
/**
* Return propertyName as an integer, defaultValue used if not defined.
*
* @param propertyName name of property.
* @param defaultValue integer to return if property not defined.
* @return value of property, or default if not found, as an int.
*/
public static int asInteger(String propertyName, int defaultValue)
{
String p = getPropertyValue(propertyName);
if (p != null)
{
return Integer.parseInt(p);
}
return defaultValue;
}
/**
* Return propertyName as a BigInteger.
*
* @param propertyName name of property.
* @return value of property as a BigInteger, null if not defined.
*/
public static BigInteger asBigInteger(String propertyName)
{
String p = getPropertyValue(propertyName);
if (p != null)
{
return new BigInteger(p);
}
return null;
}
public static Set asKeySet(String propertyName)
{
Set set = new HashSet();
String p = getPropertyValue(propertyName);
if (p != null)
{
StringTokenizer sTok = new StringTokenizer(p, ",");
while (sTok.hasMoreElements())
{
set.add(Strings.toLowerCase(sTok.nextToken()).trim());
}
}
return Collections.unmodifiableSet(set);
}
/**
* Return the String value of the property propertyName. Property valuation
* starts with java.security, then thread local, then system properties.
*
* @param propertyName name of property.
* @return value of property as a String, null if not defined.
*/
public static String getPropertyValue(final String propertyName)
{
String val = (String)AccessController.doPrivileged(new PrivilegedAction()
{
public Object run()
{
return Security.getProperty(propertyName);
}
});
if (val != null)
{
return val;
}
Map localProps = (Map)threadProperties.get();
if (localProps != null)
{
String p = (String)localProps.get(propertyName);
if (p != null)
{
return p;
}
}
return (String)AccessController.doPrivileged(new PrivilegedAction()
{
public Object run()
{
return System.getProperty(propertyName);
}
});
}
public static String getPropertyValue(final String propertyName, String defValue)
{
String rv = getPropertyValue(propertyName);
if (rv == null)
{
return defValue;
}
return rv;
}
private static boolean isSetFalse(String p)
{
if (p == null || p.length() != 5)
{
return false;
}
return (p.charAt(0) == 'f' || p.charAt(0) == 'F')
&& (p.charAt(1) == 'a' || p.charAt(1) == 'A')
&& (p.charAt(2) == 'l' || p.charAt(2) == 'L')
&& (p.charAt(3) == 's' || p.charAt(3) == 'S')
&& (p.charAt(4) == 'e' || p.charAt(4) == 'E');
}
private static boolean isSetTrue(String p)
{
if (p == null || p.length() != 4)
{
return false;
}
return (p.charAt(0) == 't' || p.charAt(0) == 'T')
&& (p.charAt(1) == 'r' || p.charAt(1) == 'R')
&& (p.charAt(2) == 'u' || p.charAt(2) == 'U')
&& (p.charAt(3) == 'e' || p.charAt(3) == 'E');
}
}