144 lines
3.6 KiB
Java
144 lines
3.6 KiB
Java
package org.thdl.lex;
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import java.io.IOException;
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import java.util.Enumeration;
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import javax.servlet.Filter;
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import javax.servlet.FilterChain;
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import javax.servlet.FilterConfig;
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import javax.servlet.ServletException;
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import javax.servlet.ServletRequest;
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import javax.servlet.ServletResponse;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import javax.servlet.http.HttpSession;
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import org.thdl.users.*;
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/**
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* Description of the Class
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*
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* @author travis
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* @created October 21, 2003
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*/
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public class AuthenticationFilter implements Filter
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{
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//attributes
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private String loginPage;
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//accessors
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/**
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* Sets the loginPage attribute of the AuthenticationFilter object
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*
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* @param loginPage The new loginPage value
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*/
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public void setLoginPage( String loginPage )
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{
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this.loginPage = loginPage;
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}
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/**
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* Gets the loginPage attribute of the AuthenticationFilter object
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*
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* @return The loginPage value
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*/
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public String getLoginPage()
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{
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return loginPage;
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}
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//contract methods
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/**
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* Description of the Method
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*
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* @param config Description of the Parameter
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* @exception ServletException Description of the Exception
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*/
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public void init( FilterConfig config ) throws ServletException
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{
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setLoginPage( config.getInitParameter( "loginPage" ) );
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if ( null == getLoginPage() )
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{
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throw new ServletException( "The loginPage parameter must be specified" );
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}
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}
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/**
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* Description of the Method
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*
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* @param request Description of the Parameter
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* @param response Description of the Parameter
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* @param chain Description of the Parameter
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* @exception IOException Description of the Exception
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* @exception ServletException Description of the Exception
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*/
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public void doFilter( ServletRequest request, ServletResponse response, FilterChain chain ) throws IOException, ServletException
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{
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if ( request instanceof HttpServletRequest && response instanceof HttpServletResponse )
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{
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HttpServletRequest req = (HttpServletRequest) request;
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Visit visit = UserSessionManager.getInstance().getVisit( req.getSession( true ) );
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ThdlUser user = visit.getUser();
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if ( null == user )
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{
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requireLogin( req, (HttpServletResponse) response, req.getSession( true ) );
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}
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else
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{
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chain.doFilter( request, response );
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}
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}
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else
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{
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throw new ServletException( "Filter only applicable to HTTP and HTTPS requests" );
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}
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}
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/**
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* Description of the Method
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*/
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public void destroy() { }
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//helper methods
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/**
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* Description of the Method
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*
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* @param request Description of the Parameter
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* @param response Description of the Parameter
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* @param session Description of the Parameter
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* @exception IOException Description of the Exception
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*/
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public void requireLogin( HttpServletRequest request, HttpServletResponse response, HttpSession session ) throws IOException
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{
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StringBuffer buffer = request.getRequestURL();
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String query = request.getQueryString();
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Enumeration params = request.getParameterNames();
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boolean paramsExist;
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if ( params.hasMoreElements() )
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{
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paramsExist = true;
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buffer.append( '?' );
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while ( params.hasMoreElements() )
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{
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String temp = (String) params.nextElement();
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buffer.append( temp + "=" + request.getParameter( temp ) );
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if ( params.hasMoreElements() )
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{
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buffer.append( "&" );
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}
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}
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}
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else
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{
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paramsExist = false;
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}
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UserSessionManager.getInstance().setSessionLoginTarget( session, buffer.toString() );
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UserSessionManager.doRedirect( request, response, loginPage );
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}
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}
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