/**
    * This file Copyright (c) 2020 Magnolia International
    * Ltd.  (http://www.magnolia-cms.com). All rights reserved.
    *
    *
    * This file is dual-licensed under both the Magnolia
    * Network Agreement and the GNU General Public License.
    * You may elect to use one or the other of these licenses.
    *
   * This file is distributed in the hope that it will be
   * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the
   * implied warranty of MERCHANTABILITY or FITNESS FOR A
   * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT.
   * Redistribution, except as permitted by whichever of the GPL
   * or MNA you select, is prohibited.
   *
   * 1. For the GPL license (GPL), you can redistribute and/or
   * modify this file under the terms of the GNU General
   * Public License, Version 3, as published by the Free Software
   * Foundation.  You should have received a copy of the GNU
   * General Public License, Version 3 along with this program;
   * if not, write to the Free Software Foundation, Inc., 51
   * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * 2. For the Magnolia Network Agreement (MNA), this file
   * and the accompanying materials are made available under the
   * terms of the MNA which accompanies this distribution, and
   * is available at http://www.magnolia-cms.com/mna.html
   *
   * Any modifications to this file must keep this entire header
   * intact.
   *
   */
  package info.magnolia.setup;
  
  import info.magnolia.cms.filters.AddHeadersFilter;
  import info.magnolia.cors.AbstractCorsFilter;
  import info.magnolia.jcr.util.NodeUtil;
  import info.magnolia.jcr.wrapper.JCRMgnlPropertiesFilteringNodeWrapper;
  import info.magnolia.module.InstallContext;
  import info.magnolia.module.delta.AbstractRepositoryTask;
  import info.magnolia.module.delta.TaskExecutionException;
  
  import javax.jcr.Node;
  import javax.jcr.Property;
  import javax.jcr.PropertyIterator;
  import javax.jcr.RepositoryException;
  
  import com.machinezoo.noexception.Exceptions;
  
  /**
   * Task that will output warn message if any previous CORS configuration added with AddHeadersFilter found.
   */
  public class WarnOnCorsAddedByAddHeadersFilter extends AbstractRepositoryTask {
  
      private static final String WARN_MESSAGE = "A custom CORS configuration has been detected via the AddHeadersFilter. " +
              "Please either disable or remove this configuration, and use the out-of-the-box Magnolia CORS configuration. For more information, see the CORS section on https://documentation.magnolia-cms.com/display/DOCS/Filters.";
  
      public WarnOnCorsAddedByAddHeadersFilter() {
          super("Warn on CORS filter configuration", "Warn if CORS filter configuration added using AddHeadersFilter is present");
      }
  
      @Override
      protected void doExecute(final InstallContext installContext) throws RepositoryException, TaskExecutionException {
          final Node filtersNode = installContext.getConfigJCRSession().getNode("/server/filters");
          final boolean shouldWarn = NodeUtil.asList(NodeUtil.getNodes(filtersNode)).stream()
                  .filter(Exceptions.wrap().predicate(this::isAddHeadersFilter))
                  .filter(Exceptions.wrap().predicate(this::isFilterEnabled))
                  .anyMatch(Exceptions.wrap().predicate(this::hasCorsHeaders));
          if (shouldWarn) {
              installContext.warn(WARN_MESSAGE);
          }
      }
  
      private boolean hasCorsHeaders(final Node node) throws RepositoryException {
          if (node.hasNode("headers")) {
              final PropertyIterator properties = new JCRMgnlPropertiesFilteringNodeWrapper(node.getNode("headers")).getProperties();
              while (properties.hasNext()) {
                  final Property property = properties.nextProperty();
                  if (property.getName().equalsIgnoreCase(AbstractCorsFilter.Headers.ACCESS_CONTROL_ALLOW_ORIGIN.getName())) {
                      return true;
                  }
              }
          }
          return false;
      }
  
      private boolean isAddHeadersFilter(final Node node) throws RepositoryException {
          return node.hasProperty("class") && node.getProperty("class").getString().equals(AddHeadersFilter.class.getName());
      }
  
      private boolean isFilterEnabled(final Node node) throws RepositoryException {
          return !node.hasProperty("enabled") || (node.hasProperty("enabled") && node.getProperty("enabled").getBoolean());
      }
  }