Glassfish example source code file (TranslatedConfigView.java)

This example Glassfish source code file (TranslatedConfigView.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Glassfish tags/keywords

alias, alias_token, class, configbeanproxy, configview, configview, file, io, log, logging, object, object, reflection, regex, security, string, string, t, t, translatedconfigview

The Glassfish TranslatedConfigView.java source code

/*
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 *
 * Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
 *
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 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
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 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
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 * and therefore, elected the GPL Version 2 license, then the option applies
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 */

package org.glassfish.config.support;

import org.jvnet.hk2.config.ConfigView;
import org.jvnet.hk2.config.ConfigBeanProxy;
import org.jvnet.hk2.component.Habitat;
import org.jvnet.hk2.annotations.Service;
import org.jvnet.hk2.annotations.Inject;
//import org.glassfish.security.common.RelativePathResolver;
import org.glassfish.security.common.MasterPassword;

import java.util.regex.Pattern;
import java.util.regex.Matcher;
import java.util.logging.Logger;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.UnrecoverableKeyException;
import java.security.cert.CertificateException;
import java.io.IOException;

import com.sun.enterprise.security.store.PasswordAdapter;


/**
 * View that translate configured attributes containing properties like ${foo.bar}
 * into system properties values.
 *
 * @author Jerome Dochez
 */
public class TranslatedConfigView implements ConfigView {

    final static Pattern p = Pattern.compile("([^\\$]*)\\$\\{([^\\}]*)\\}([^\\$]*)");

    private static final String ALIAS_TOKEN = "ALIAS";
    
    public static Object getTranslatedValue(Object value) {
        if (value!=null && value instanceof String) {
            String stringValue = value.toString();
            if (stringValue.indexOf('$')==-1) {
                return value;
            }
            MasterPassword masterpasswd =  habitat.getByContract(MasterPassword.class);
            if (masterpasswd!= null) {
                if (getAlias(stringValue) != null) {
                    try{
                        return getRealPasswordFromAlias(masterpasswd,stringValue);
                    } catch (Exception e) {
                        Logger.getAnonymousLogger().severe("Error in dealiasing the password " +e.getLocalizedMessage());
                        return stringValue;
                    }
                }
            }
           

            Matcher m = p.matcher(stringValue);
            while (m.find()) {
                String newValue = System.getProperty(m.group(2).trim());
                if (newValue!=null) {
                    stringValue = m.replaceFirst(m.quoteReplacement(m.group(1)+
                            System.getProperty(m.group(2).trim())+m.group(3)));
                    m.reset(stringValue);
                }
            }
            return stringValue;
        }
        return value;
    }

    final ConfigView masterView;

    
    TranslatedConfigView(ConfigView master ) {
        this.masterView = master;

    }

    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
        return getTranslatedValue(masterView.invoke(proxy, method, args));
    }


    public ConfigView getMasterView() {
        return masterView;  //To change body of implemented methods use File | Settings | File Templates.
    }

    public void setMasterView(ConfigView view) {
        // immutable implementation
    }

    public <T extends ConfigBeanProxy> Class getProxyType() {
        return masterView.getProxyType();
    }

    public <T extends ConfigBeanProxy> T getProxy(Class proxyType) {
        return proxyType.cast(Proxy.newProxyInstance(proxyType.getClassLoader(), new Class[]{proxyType},
                 this));
    }
    static Habitat habitat;
    public static void setHabitat(Habitat h) {
         habitat = h;
    }

   /**
     * check if a given property name matches AS alias pattern ${ALIAS=aliasname}.
     * if so, return the aliasname, otherwise return null.
     * @param propName The property name to resolve. ex. ${ALIAS=aliasname}.
     * @return The aliasname or null.
     */
    static public String getAlias(String propName)
    {
       String aliasName=null;
       String starter = "${" + ALIAS_TOKEN + "="; //no space is allowed in starter
       String ender   = "}";

       propName = propName.trim();
       if (propName.startsWith(starter) && propName.endsWith(ender) ) {
           propName = propName.substring(starter.length() );
           int lastIdx = propName.length() - 1;
           if (lastIdx > 1) {
              propName = propName.substring(0,lastIdx);
              if (propName!=null)
                 aliasName = propName.trim();
           }
       }
       return aliasName;
    }

    public static String getRealPasswordFromAlias(MasterPassword masterPasswordHelper,final String at) throws
               KeyStoreException, CertificateException, IOException, NoSuchAlgorithmException,
               UnrecoverableKeyException {

           final String          an = getAlias(at);
           final PasswordAdapter pa = masterPasswordHelper.getMasterPasswordAdapter(); // use default password store
           final boolean     exists = pa.aliasExists(an);
           if (!exists) {

               final String msg = String.format("Alias  %s does not exist",an);
               throw new IllegalArgumentException(msg);
           }
           final String real = pa.getPasswordForAlias(an);
           return ( real );
       }

    
}