content: /*
   *  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.causeway.commons.internal.hardening;
  
  import org.jsoup.Jsoup;
  import org.jsoup.safety.Safelist;
  
  import org.jspecify.annotations.Nullable;
  
  import org.apache.causeway.commons.internal.base._Strings;
  
  /**
   * Various hardening utilities.
   * <p>
   * Introduced as a consequence of CAUSEWAY-3077.
   */
  public class _Hardening {
  
      /**
       * @see "https://jsoup.org/cookbook/cleaning-html/safelist-sanitizer"
       */
      public static String toSafeHtml(final @Nullable String untrustedHtml) {
          if(_Strings.isEmpty(untrustedHtml)) {
              return untrustedHtml;
          }
          return Jsoup.clean(untrustedHtml, Safelist.basic());
      }
  
  }
  