# AuthFilter.java

    /*
    ** Module   : AuthFilter.css
    ** Abstract : Authentication servlet filter
    **
    ** Copyright (c) 2017-2023, Golden Code Development Corporation.
    **
    ** -#- -I- --Date-- ------------------------------Description----------------------------------
    ** 001 HC  20170612 Initial version.
    ** 002 GBB 20230825 SecurityManager context methods calls updated.
    */
    /*
    ** This program is free software: you can redistribute it and/or modify
    ** it under the terms of the GNU Affero General Public License as
    ** published by the Free Software Foundation, either version 3 of the
    ** License, or (at your option) any later version.
    **
    ** This program is distributed in the hope that it will be useful,
    ** but WITHOUT ANY WARRANTY; without even the implied warranty of
    ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    ** GNU Affero General Public License for more details.
    **
    ** You may find a copy of the GNU Affero GPL version 3 at the following
    ** location: https://www.gnu.org/licenses/agpl-3.0.en.html
    **
    ** Additional terms under GNU Affero GPL version 3 section 7:
    **
    **   Under Section 7 of the GNU Affero GPL version 3, the following additional
    **   terms apply to the works covered under the License.  These additional terms
    **   are non-permissive additional terms allowed under Section 7 of the GNU
    **   Affero GPL version 3 and may not be removed by you.
    **
    **   0. Attribution Requirement.
    **
    **     You must preserve all legal notices or author attributions in the covered
    **     work or Appropriate Legal Notices displayed by works containing the covered
    **     work.  You may not remove from the covered work any author or developer
    **     credit already included within the covered work.
    **
    **   1. No License To Use Trademarks.
    **
    **     This license does not grant any license or rights to use the trademarks
    **     Golden Code, FWD, any Golden Code or FWD logo, or any other trademarks
    **     of Golden Code Development Corporation. You are not authorized to use the
    **     name Golden Code, FWD, or the names of any author or contributor, for
    **     publicity purposes without written authorization.
    **
    **   2. No Misrepresentation of Affiliation.
    **
    **     You may not represent yourself as Golden Code Development Corporation or FWD.
    **
    **     You may not represent yourself for publicity purposes as associated with
    **     Golden Code Development Corporation, FWD, or any author or contributor to
    **     the covered work, without written authorization.
    **
    **   3. No Misrepresentation of Source or Origin.
    **
    **     You may not represent the covered work as solely your work.  All modified
    **     versions of the covered work must be marked in a reasonable way to make it
    **     clear that the modified work is not originating from Golden Code Development
    **     Corporation or FWD.  All modified versions must contain the notices of
    **     attribution required in this license.
    */
    package com.goldencode.p2j.admin.server;

    import com.goldencode.p2j.security.*;
    import com.goldencode.p2j.security.SecurityManager;

    import javax.servlet.*;
    import javax.servlet.http.*;
    import java.io.*;

    /**
     * Authentication servlet filter. The class intercepts all HTTP requests and returns
     * 401 in case the request is not authenticated.
     */
    public class AuthFilter
    implements Filter
    {
       /**
        * Filter initialization.
        *
        * @param   filterConfig
        *          Filter configuration.
        *
        * @throws  ServletException
        *          The servlet exception
        */
       @Override
       public void init(FilterConfig filterConfig)
       throws ServletException
       {
       }

       /**
        * Main filter logic.
        *
        * @param   servletRequest
        *          Servlet request.
        * @param   servletResponse
        *          Servlet response.
        * @param   filterChain
        *          Filter chain.
        *
        * @throws  IOException
        *          The IO exception
        * @throws  ServletException
        *          The servlet exception
        */
       @Override
       public void doFilter(ServletRequest servletRequest,
                            ServletResponse servletResponse,
                            FilterChain filterChain)
       throws IOException,
              ServletException
       {
          HttpServletRequest httpReq = (HttpServletRequest) servletRequest;
          HttpServletResponse httpResp = (HttpServletResponse) servletResponse;
          HttpSession session = httpReq.getSession();

          if (AuthServiceImpl.isAuthenticated(httpReq))
          {
             SecurityManager sm = SecurityManager.getInstance();
             try
             {
                sm.contextSm.setUniqueInitialSecurityContext();
                sm.contextSm.pushAndSwitchSecurityContextBySessionId(session.getId());
                try
                {
                   filterChain.doFilter(servletRequest, servletResponse);
                }
                finally
                {
                   sm.contextSm.popAndRestoreSecurityContext();
                   sm.contextSm.dropInitialSecurityContext();
                }
             }
             catch (RestrictedUseException e)
             {
                throw new RuntimeException(e);
             }
          }
          else
          {
             httpResp.setStatus(401);
          }
       }

       /**
        * Filter finalization.
        */
       @Override
       public void destroy()
       {
          // no-op
       }
    }