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.activemq.jaas;
  
  import java.io.File;
  import java.io.FileInputStream;
  import java.io.IOException;
  import java.util.HashMap;
  import java.util.HashSet;
  import java.util.Map;
  import java.util.Properties;
  import java.util.Set;
  import java.util.regex.Pattern;
  import java.util.regex.PatternSyntaxException;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  public class ReloadableProperties {
      private static final Logger LOG = LoggerFactory.getLogger(ReloadableProperties.class);
  
      private Properties props = new Properties();
      private Map<String, String> invertedProps;
      private Map<String, Set<String>> invertedValueProps;
      private Map<String, Pattern> regexpProps;
      private long reloadTime = -1;
      private final PropertiesLoader.FileNameKey key;
  
      public ReloadableProperties(PropertiesLoader.FileNameKey key) {
          this.key = key;
      }
  
      public synchronized Properties getProps() {
          return props;
      }
  
      public synchronized ReloadableProperties obtained() {
          if (reloadTime < 0 || (key.isReload() && hasModificationAfter(reloadTime))) {
              props = new Properties();
              try {
                  load(key.file(), props);
                  invertedProps = null;
                  invertedValueProps = null;
                  regexpProps = null;
                  if (key.isDebug()) {
                      LOG.debug("Load of: " + key);
                  }
              } catch (IOException e) {
                  LOG.error("Failed to load: " + key + ", reason:" + e.getLocalizedMessage());
                  if (key.isDebug()) {
                      LOG.debug("Load of: " + key + ", failure exception" + e);
                  }
              }
              reloadTime = System.currentTimeMillis();
          }
          return this;
      }
  
      public synchronized Map<String, String> invertedPropertiesMap() {
          if (invertedProps == null) {
              invertedProps = new HashMap<>(props.size());
              for (Map.Entry<Object, Object> val : props.entrySet()) {
                  String str = (String) val.getValue();
                  if (!looksLikeRegexp(str)) {
                      invertedProps.put(str, (String) val.getKey());
                  }
              }
          }
          return invertedProps;
      }
  
      public synchronized Map<String, Set<String>> invertedPropertiesValuesMap() {
          if (invertedValueProps == null) {
              invertedValueProps = new HashMap<>(props.size());
              for (Map.Entry<Object, Object> val : props.entrySet()) {
                  String[] userList = ((String)val.getValue()).split(",");
                  for (String user : userList) {
                      Set<String> set = invertedValueProps.get(user);
                      if (set == null) {
                          set = new HashSet<>();
                          invertedValueProps.put(user, set);
                      }
                      set.add((String)val.getKey());
                  }
              }
          }
          return invertedValueProps;
      }
  
      public synchronized Map<String, Pattern> regexpPropertiesMap() {
          if (regexpProps == null) {
              regexpProps = new HashMap<>(props.size());
              for (Map.Entry<Object, Object> val : props.entrySet()) {
                  String str = (String) val.getValue();
                  if (looksLikeRegexp(str)) {
                      try {
                          Pattern p = Pattern.compile(str.substring(1, str.length() - 1));
                          regexpProps.put((String) val.getKey(), p);
                      } catch (PatternSyntaxException e) {
                          LOG.warn("Ignoring invalid regexp: " + str);
                      }
                  }
              }
          }
          return regexpProps;
      }
  
      private void load(final File source, Properties props) throws IOException {
          FileInputStream in = new FileInputStream(source);
          try {
              props.load(in);
              if (key.isDecrypt()) {
                  try {
                      EncryptionSupport.decrypt(this.props, key.getAlgorithm());
                  } catch (NoClassDefFoundError e) {
                      // this Happens whe jasypt is not on the classpath..
                      key.setDecrypt(false);
                      LOG.info("jasypt is not on the classpath: password decryption disabled.");
                  }
              }
  
          } finally {
              in.close();
          }
      }
  
      private boolean hasModificationAfter(long reloadTime) {
          return key.file.lastModified() > reloadTime;
      }
  
      private boolean looksLikeRegexp(String str) {
          int len = str.length();
          return len > 2 && str.charAt(0) == '/' && str.charAt(len - 1) == '/';
      }
  
  }
  