securityhelper.java

一些公用的Java函数

/*
 * SecurityManager.java
 * 
 * Created on 2007-10-30, 10:30:17
 * 
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

package com.s7turn.jaas;

import com.s7turn.sdk.content.ContentException;
import com.s7turn.sdk.content.ContentFactory;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Map;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import javax.servlet.FilterConfig;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;
import com.s7turn.logging.Logger;
/**
 *
 * @author Long
 */
public class SecurityHelper 
{
    //public static final String CONTENT_FACTORY = "com.s7turn.contentFactory";
    private static Logger logger = Logger.getLogger( SecurityHelper.class );
    private Map<String, PageSecurity> securityInstance = new HashMap<String, PageSecurity>();
    private Map<String, PageSecurity> configInstance = new HashMap<String, PageSecurity>();
    private Map<String, String> exceptions = new HashMap<String, String>();
    private ContentFactory factory;
    private Map<String, String> contentPattern = new HashMap<String, String>(); 
    private Map<String, String> editContentTemplate = new HashMap<String, String>(); 
    private SecurityProvider securityProvider = null;
    private static SecurityHelper instance = new SecurityHelper();
    
    private SecurityHelper()
    {
        
    }
    
    public static SecurityHelper getInstance()
    {
        return instance;
    }
    
    public boolean hasPermission(  Identity identity, String page ) throws LoginException
    {
        PageSecurity sec = securityInstance.get( page );
        if( sec == null )
        {
            Iterator<Map.Entry<String, PageSecurity>> iter = configInstance.entrySet().iterator();
            while( iter.hasNext() )
            {
                Map.Entry<String, PageSecurity> entry = iter.next();
                PageSecurity sep = entry.getValue();
                if( matchPattern( page, sep.getPage() ) )
                {
                    List excepts = sep.getExceptPages();
                    Iterator<String> iterExcept = excepts.iterator();
                    boolean excepted = false;
                    while( iterExcept.hasNext() )
                    {
                        String exceptPage = iterExcept.next();
                        if( matchPattern( page, exceptPage ) )
                        {
                            ///wait for next page
                            excepted = true;
                            break;
                        }
                    }
                    
                    if( excepted == false )
                    {
                        sec = new PageSecurity();
                        sep.copyPermissionTo( sec );
                        sec.setPage(page);
                        securityInstance.put(page, sec);
                    }
                }
            }
        }
        
        if( sec != null )
        {
        
        if( sec.isLoginRequired() )
        {
            if( identity == null ||  !identity.isLoggedIn() )
            {
                throw new LoginException( "login-required" );
            }
            
            Map<String, Boolean> allowUsers = sec.getAllowUser();
            //////check the user name match.
            Boolean allowUser = allowUsers.get( identity.getUserName() );
            if( allowUser != null )
            {
                ////process this directly.
                return allowUser.booleanValue();
            }

            ////process users
            Iterator<Map.Entry<String, Boolean>> allowIters = allowUsers.entrySet().iterator();
            boolean allowed = false;
            while( allowIters.hasNext() )
            {
                Map.Entry<String, Boolean> mp = allowIters.next();
                String user = mp.getKey();
                
                if( matchPattern( identity.getUserName(), user ) )
                {
                    if( !mp.getValue().booleanValue() )
                    {
                        return false;
                    }
                    allowed = mp.getValue().booleanValue();
                }
            }
            if ( allowed == true )
            {
                return true;
            }

            //Boolean allowRole = sec.getAllowRoles().get(  );
            Map<String, Boolean> allowRoles = sec.getAllowRoles();
            Iterator<Map.Entry<String, Boolean>> allowRolesIter = allowRoles.entrySet().iterator();
            allowed = false;
            Boolean bl = allowRoles.get("*");

            if( bl != null )
            {
                allowed = bl.booleanValue();
            }

            while( allowRolesIter.hasNext() )
            {
                Map.Entry<String, Boolean> roleSec = allowRolesIter.next();
                if( identity.isUserInRole( roleSec.getKey() ) )
                {
                    allowed = roleSec.getValue().booleanValue();
                }
            }
            return allowed;
        }
        }
        
         return true;
    }
    
    public SecurityProvider getSecurityProvider()
    {
        return securityProvider;
    }
    
    public String getExceptionMappedPage(String emp)
    {
        return exceptions.get(emp);
    }
    

    public void addPageSecurityConfig(PageSecurity page)
    {
        configInstance.put(page.getPage(), page);
    }
    
    public void addPageSecurityConfig( Element element )
    {
        String viewId = element.getAttribute( "view-id" );
        String loginRequired = element.getAttribute("login-required");
        if( viewId != null && viewId.trim().length() > 0 )
        {
            PageSecurity page = new PageSecurity();
            
            page.setPage( viewId );
            
            page.setLoginRequired( "true".equalsIgnoreCase(loginRequired) );
            
            NodeList allows = element.getElementsByTagName("allow");
            if( allows != null )
            {
                for( int i = 0; i < allows.getLength(); i ++ )
                {
                    Element elem = (Element) allows.item(i);
                    String user = elem.getAttribute("user");
                    String role = elem.getAttribute("role");
                    
                    if( user != null && user.trim().length() > 0 )
                    {
                        page.addAllowUser(user);
                    }
                    
                    if( role != null && role.trim().length() > 0 )
                    {
                        page.addAllowRoles(role);
                    }
                    
                }
            }

            NodeList dennieds = element.getElementsByTagName("dennied");
            if( dennieds != null )
            {
                for( int i = 0; i < dennieds.getLength(); i ++ )
                {
                    Element elem = (Element) dennieds.item(i);
                    String user = elem.getAttribute("user");
                    String role = elem.getAttribute("role");
                    if( user != null && user.trim().length() > 0 )
                    {
                        page.addDenniedUser(user);
                    }
                    if( role != null && role.trim().length() > 0 )
                    {
                        page.addDenniedRole(role);
                    }
                    
                }
            }
            
            NodeList excepts = element.getElementsByTagName("except");
            if( excepts != null )
            {
                for( int i = 0; i < excepts.getLength(); i ++ )
                {
                    Element elem = (Element) excepts.item(i);
                    String expId = elem.getAttribute("view-id");
                    if( expId == null || expId.trim().length() == 0 )
                    {
                        expId = elem.getTextContent();
                    }
                    page.addExceptPages(expId);
                }
            }
            
            addPageSecurityConfig(page);
        }
        
    }
    
    private boolean matchPattern( String org, String pattern )