package org.exoplatform.platform.welcomescreens.web;
   
   import java.io.IOException;
   
   import javax.servlet.*;
   import javax.servlet.http.HttpServletRequest;
   import javax.servlet.http.HttpServletResponse;
   
   import org.exoplatform.commons.utils.PropertyManager;
  import org.exoplatform.container.ExoContainerContext;
  import org.exoplatform.container.PortalContainer;
  import org.exoplatform.platform.common.software.register.UnlockService;
  import org.exoplatform.platform.welcomescreens.service.TermsAndConditionsService;
  import org.exoplatform.web.filter.Filter;
  
  /**
   * Filter responsible of Terms and conditions displaying.
   * Call TermsAndConditions service to know if TermsAndConditions are checked, if not, forward to TermsAndConditions page
   * <p>
   * 2 conditions to forward to termes and conditions page:
   * <ul>
   * <li>Request URI is not a login URI. In this case we need to execute TermsAndConditions process after login process</li>
   * <li>TermsAndConditions is not checked</li>
   * </ul>
   * 
   * @author Clement
   *
   */
  public class TermsAndConditionsFilter implements Filter {
  
    private static final String PLF_WELCOME_SCREENS_SERVLET_CTX = "/trial";
    private static final String TC_SERVLET_URL = "/terms-and-conditions";
    private static final String INITIAL_URI_PARAM_NAME = "initialURI";
    private static final String LOGIN_URI = "/login";
    private static final String DOLOGIN_URI = "/dologin";
  
    public TermsAndConditionsFilter() {
  
    }
  
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
      HttpServletRequest httpServletRequest = (HttpServletRequest)request;
      HttpServletResponse httpServletResponse = (HttpServletResponse)response;
  
      TermsAndConditionsService termsAndConditionsService = PortalContainer.getInstance().getComponentInstanceOfType(TermsAndConditionsService.class);
      UnlockService unlockService = PortalContainer.getInstance().getComponentInstanceOfType(UnlockService.class);
  
      boolean tcChecked = termsAndConditionsService.isTermsAndConditionsChecked();
      
      String requestUri = httpServletRequest.getRequestURI();
      String loginRequestUri = httpServletRequest.getContextPath() + LOGIN_URI;
      String dologinRequestUri = httpServletRequest.getContextPath() + DOLOGIN_URI;
      boolean isLoginUri = (requestUri.contains(loginRequestUri) || requestUri.contains(dologinRequestUri));
      boolean isRestUri = requestUri.contains(ExoContainerContext.getCurrentContainer().getContext().getRestContextName());
      boolean isDevMod = PropertyManager.isDevelopping();
      if(! isLoginUri && ! isRestUri && ! tcChecked && !isDevMod && unlockService.showTermsAndConditions()) {
        // Get full url
        String reqUri = httpServletRequest.getRequestURI().toString();
        String queryString = httpServletRequest.getQueryString();
        if (queryString != null) {
            reqUri =new StringBuffer(reqUri).append("?").append(queryString).toString();
        }
        
        // Get plf extension servlet context (because TermsAndConditionsFilter and terms-and-conditions servlet declaration are not on same context (webapp))
        ServletContext welcomrScreensContext = httpServletRequest.getSession().getServletContext().getContext(PLF_WELCOME_SCREENS_SERVLET_CTX);
        // Forward to resource from this context: 
        String uriTarget = (new StringBuilder()).append(TC_SERVLET_URL + "?" + INITIAL_URI_PARAM_NAME + "=").append(reqUri).toString();
        welcomrScreensContext.getRequestDispatcher(uriTarget).forward(httpServletRequest, httpServletResponse);
        return;
      }
      chain.doFilter(request, response);
    }
  }