/*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you under the Apache License, Version 2.0 (the
    * "License"); you may not use this file except in compliance
    * with the License.  You may obtain a copy of the License at
    *
   *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   * KIND, either express or implied.  See the License for the
   * specific language governing permissions and limitations
   * under the License.
   */
  package org.apache.syncope.client.enduser;
  
  import java.security.AccessControlException;
  import javax.ws.rs.BadRequestException;
  import javax.ws.rs.ForbiddenException;
  import javax.xml.ws.WebServiceException;
  import org.apache.commons.lang3.StringUtils;
  import org.apache.syncope.client.enduser.pages.Login;
  import org.apache.syncope.common.lib.SyncopeClientException;
  import org.apache.wicket.authorization.UnauthorizedInstantiationException;
  import org.apache.wicket.core.request.handler.PageProvider;
  import org.apache.wicket.core.request.handler.RenderPageRequestHandler;
  import org.apache.wicket.markup.html.pages.ExceptionErrorPage;
  import org.apache.wicket.protocol.http.PageExpiredException;
  import org.apache.wicket.request.IRequestHandler;
  import org.apache.wicket.request.component.IRequestablePage;
  import org.apache.wicket.request.cycle.IRequestCycleListener;
  import org.apache.wicket.request.cycle.RequestCycle;
  import org.apache.wicket.request.mapper.parameter.PageParameters;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  public class SyncopeEnduserRequestCycleListener implements IRequestCycleListener {
  
      private static final Logger LOG = LoggerFactory.getLogger(SyncopeEnduserRequestCycleListener.class);
  
      private Throwable instanceOf(final Exception e, final Class<? extends Exception> clazz) {
          return clazz.isAssignableFrom(e.getClass())
                  ? e
                  : e.getCause() != null && clazz.isAssignableFrom(e.getCause().getClass())
                  ? e.getCause()
                  : e.getCause() != null && e.getCause().getCause() != null
                  && clazz.isAssignableFrom(e.getCause().getCause().getClass())
                  ? e.getCause().getCause()
                  : null;
      }
  
      @Override
      public IRequestHandler onException(final RequestCycle cycle, final Exception e) {
          LOG.error("Exception found", e);
  
          PageParameters errorParameters = new PageParameters();
  
          IRequestablePage errorPage;
          if (instanceOf(e, UnauthorizedInstantiationException.class) != null) {
              errorParameters.add("errorMessage", SyncopeEnduserSession.Error.AUTHORIZATION.fallback());
              errorPage = new Login(errorParameters);
          } else if (instanceOf(e, AccessControlException.class) != null) {
              if (StringUtils.containsIgnoreCase(instanceOf(e, AccessControlException.class).getMessage(), "expired")) {
                  errorParameters.add("errorMessage", SyncopeEnduserSession.Error.SESSION_EXPIRED.fallback());
              } else {
                  errorParameters.add("errorMessage", SyncopeEnduserSession.Error.AUTHORIZATION.fallback());
              }
              errorPage = new Login(errorParameters);
          } else if (instanceOf(e, PageExpiredException.class) != null || !SyncopeEnduserSession.get().isSignedIn()) {
              errorParameters.add("errorMessage", SyncopeEnduserSession.Error.SESSION_EXPIRED.fallback());
              errorPage = new Login(errorParameters);
          } else if (instanceOf(e, BadRequestException.class) != null
                  || instanceOf(e, WebServiceException.class) != null
                  || instanceOf(e, SyncopeClientException.class) != null) {
  
              errorParameters.add("errorMessage", SyncopeEnduserSession.Error.REST.fallback());
              errorPage = new Login(errorParameters);
          } else {
              Throwable cause = instanceOf(e, ForbiddenException.class);
              if (cause == null) {
                  // redirect to default Wicket error page
                  errorPage = new ExceptionErrorPage(e, null);
              } else {
                  errorParameters.add("errorMessage", cause.getMessage());
                  errorPage = new Login(errorParameters);
              }
          }
  
          if (errorPage instanceof Login) {
              try {
                  SyncopeEnduserSession.get().invalidate();
              } catch (Throwable t) {
                  // ignore
                  LOG.debug("Unexpected error while forcing logout after error", t);
              }
         }
 
         return new RenderPageRequestHandler(new PageProvider(errorPage));
     }
 }