/*
    * 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.ui.commons.resources.saml2sp4ui;
  
  import javax.servlet.http.Cookie;
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  import javax.ws.rs.HttpMethod;
  import org.apache.syncope.client.ui.commons.BaseSession;
  import org.apache.syncope.client.ui.commons.SAML2SP4UIConstants;
  import org.apache.syncope.common.lib.saml2.SAML2Constants;
  import org.apache.syncope.common.lib.saml2.SAML2Request;
  import org.apache.syncope.common.lib.saml2.SAML2Response;
  import org.apache.syncope.common.rest.api.service.SAML2SP4UIService;
  import org.apache.wicket.RestartResponseException;
  import org.apache.wicket.Session;
  import org.apache.wicket.markup.html.WebPage;
  import org.apache.wicket.request.mapper.parameter.PageParameters;
  
  public abstract class LogoutResource extends AbstractSAML2SP4UIResource {
  
      private static final long serialVersionUID = 4865223550672539533L;
  
      protected abstract Class<? extends WebPage> getLogoutPageClass();
  
      protected ResourceResponse doLogout(final SAML2Response saml2Response) {
          SAML2SP4UIService service = BaseSession.class.cast(Session.get()).getAnonymousService(SAML2SP4UIService.class);
          service.validateLogoutResponse(saml2Response);
  
          throw new RestartResponseException(getLogoutPageClass(), new PageParameters());
      }
  
      @Override
      protected ResourceResponse newResourceResponse(final Attributes attributes) {
          HttpServletRequest request = (HttpServletRequest) attributes.getRequest().getContainerRequest();
          HttpServletResponse response = (HttpServletResponse) attributes.getResponse().getContainerResponse();
  
          switch (request.getMethod()) {
              case HttpMethod.GET:
                  String samlResponse = request.getParameter(SAML2Constants.SAML_RESPONSE);
                  String relayState = request.getParameter(SAML2Constants.RELAY_STATE);
                  if (samlResponse == null) {
                      // create logout request
                      Cookie idpEntityID = new Cookie(
                              SAML2SP4UIConstants.SAML2SP4UI_IDP_ENTITY_ID,
                              request.getParameter(SAML2SP4UIConstants.SAML2SP4UI_IDP_ENTITY_ID));
                      idpEntityID.setMaxAge(-1);
                      response.addCookie(idpEntityID);
  
                      SAML2SP4UIService service =
                              BaseSession.class.cast(Session.get()).getService(SAML2SP4UIService.class);
                      SAML2Request logoutRequest = service.createLogoutRequest(
                              spEntityID(attributes), SAML2SP4UIConstants.URL_CONTEXT);
  
                      Session.get().invalidate();
  
                      return send(logoutRequest);
                  } else {
                      // process REDIRECT binding logout response
                      return doLogout(buildResponse(attributes, samlResponse, relayState));
                  }
  
              case HttpMethod.POST:
                  return doLogout(extract(attributes));
  
              default:
                  throw new UnsupportedOperationException("Only GET and POST are supported");
          }
      }
  }