| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. 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. For additional information regarding |
| * copyright in this work, please see the NOTICE file in the top level |
| * directory of this distribution. |
| */ |
| |
| package org.apache.roller.weblogger.util; |
| |
| import java.io.BufferedReader; |
| import java.io.FileReader; |
| import java.io.FileWriter; |
| import java.io.PrintWriter; |
| import java.util.HashSet; |
| import java.util.Set; |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.roller.weblogger.config.WebloggerConfig; |
| |
| |
| /** |
| * Represents a list of banned ip addresses. |
| * |
| * This base implementation gets its list from a file on the filesystem. We |
| * are also aware of when the file changes via some outside source and we will |
| * automatically re-read the file and update the list when that happens. |
| */ |
| public final class IPBanList { |
| |
| private static Log log = LogFactory.getLog(IPBanList.class); |
| |
| // set of ips that are banned, use a set to ensure uniqueness |
| private Set bannedIps = new HashSet(); |
| |
| // file listing the ips that are banned |
| private ModifiedFile bannedIpsFile = null; |
| |
| // reference to our singleton instance |
| private static IPBanList instance = null; |
| |
| |
| static { |
| instance = new IPBanList(); |
| } |
| |
| |
| // private because we are a singleton |
| private IPBanList() { |
| |
| log.debug("INIT"); |
| |
| // load up set of denied ips |
| String banIpsFilePath = WebloggerConfig.getProperty("ipbanlist.file"); |
| if(banIpsFilePath != null) { |
| ModifiedFile banIpsFile = new ModifiedFile(banIpsFilePath); |
| |
| if(banIpsFile.exists() && banIpsFile.canRead()) { |
| this.bannedIpsFile = banIpsFile; |
| this.loadBannedIps(); |
| } |
| } |
| } |
| |
| |
| // access to the singleton instance |
| public static IPBanList getInstance() { |
| return instance; |
| } |
| |
| |
| public boolean isBanned(String ip) { |
| |
| // update the banned ips list if needed |
| this.loadBannedIpsIfNeeded(false); |
| |
| if(ip != null) { |
| return this.bannedIps.contains(ip); |
| } else { |
| return false; |
| } |
| } |
| |
| |
| public void addBannedIp(String ip) { |
| |
| if(ip == null) { |
| return; |
| } |
| |
| // update the banned ips list if needed |
| this.loadBannedIpsIfNeeded(false); |
| |
| if(!this.bannedIps.contains(ip) && |
| (bannedIpsFile != null && bannedIpsFile.canWrite())) { |
| |
| try { |
| synchronized(this) { |
| // add to file |
| PrintWriter out = new PrintWriter(new FileWriter(this.bannedIpsFile, true)); |
| out.println(ip); |
| out.close(); |
| this.bannedIpsFile.clearChanged(); |
| |
| // add to Set |
| this.bannedIps.add(ip); |
| } |
| |
| log.debug("ADDED "+ip); |
| } catch(Exception e) { |
| log.error("Error adding banned ip to file", e); |
| } |
| } |
| } |
| |
| |
| /** |
| * Check if the banned ips file has changed and needs to be reloaded. |
| */ |
| private void loadBannedIpsIfNeeded(boolean forceLoad) { |
| |
| if(bannedIpsFile != null && |
| (bannedIpsFile.hasChanged() || forceLoad)) { |
| |
| // need to reload |
| this.loadBannedIps(); |
| } |
| } |
| |
| |
| /** |
| * Load the list of banned ips from a file. This clears the old list and |
| * loads exactly what is in the file. |
| */ |
| private synchronized void loadBannedIps() { |
| |
| if(bannedIpsFile != null) { |
| |
| try { |
| HashSet newBannedIpList = new HashSet(); |
| |
| // TODO: optimize this |
| BufferedReader in = new BufferedReader(new FileReader(this.bannedIpsFile)); |
| |
| String ip = null; |
| while((ip = in.readLine()) != null) { |
| newBannedIpList.add(ip); |
| } |
| |
| in.close(); |
| |
| // list updated, reset modified file |
| this.bannedIps = newBannedIpList; |
| this.bannedIpsFile.clearChanged(); |
| |
| log.info(this.bannedIps.size()+" banned ips loaded"); |
| } catch(Exception ex) { |
| log.error("Error loading banned ips from file", ex); |
| } |
| |
| } |
| } |
| |
| |
| // a simple extension to the File class which tracks if the file has |
| // changed since the last time we checked |
| private class ModifiedFile extends java.io.File { |
| |
| private long myLastModified = 0; |
| |
| public ModifiedFile(String filePath) { |
| super(filePath); |
| |
| this.myLastModified = lastModified(); |
| } |
| |
| public boolean hasChanged() { |
| return lastModified() != myLastModified; |
| } |
| |
| public void clearChanged() { |
| myLastModified = lastModified(); |
| } |
| } |
| |
| } |