PasswordAliasResolverImpl.java

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package org.glassfish.security.common;

import org.glassfish.api.admin.PasswordAliasResolver;
import org.glassfish.api.admin.PasswordAliasStore;

/**
 * Provides password alias resolution, using an internal password alias store
 * to actually resolve an alias if one is specified.
 * 
 * @author tjquinn
 */
public class PasswordAliasResolverImpl implements PasswordAliasResolver {

    private static final String ALIAS_TOKEN = "ALIAS";
    private static final String STARTER = "${" + ALIAS_TOKEN + "="; //no space is allowed in starter
    private static final String ENDER = "}";
    
    private final PasswordAliasStore store;
    public PasswordAliasResolverImpl(final PasswordAliasStore store) {
        this.store = store;
    }
    
    @Override
    public char[] resolvePassword(String aliasExpressionOrPassword) {
        final String alias = getAlias(aliasExpressionOrPassword);
        if (alias != null) {
            return store.get(alias);
        }
        return aliasExpressionOrPassword.toCharArray();
    }
    
    /**
     * 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.
     */    
    private static String getAlias(String pwOrAliasExpression)
    {
       String aliasName=null;

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