| /**************************************************************** |
| * 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.james.protocols.lib; |
| |
| import java.time.Duration; |
| import java.time.Instant; |
| import java.util.Collections; |
| import java.util.HashMap; |
| import java.util.Iterator; |
| import java.util.Map; |
| |
| /** |
| * Helper class which is used to store ipAddresses and timestamps for pop before |
| * smtp support. |
| */ |
| public class POP3BeforeSMTPHelper { |
| |
| private POP3BeforeSMTPHelper() { |
| } |
| |
| /** |
| * The map in which the ipAddresses and timestamp stored |
| */ |
| public static final Map<String, Instant> ipMap = Collections.synchronizedMap(new HashMap<>()); |
| |
| /** |
| * Default expire time in ms (60 hour) |
| */ |
| public static final Duration EXPIRE_TIME = Duration.ofHours(60); |
| |
| /** |
| * Return true if the ip is authorized to relay |
| * |
| * @param ipAddress |
| * The ipAddress |
| * @return true if authorized. Else false |
| */ |
| public static boolean isAuthorized(String ipAddress) { |
| return ipMap.containsKey(ipAddress); |
| } |
| |
| /** |
| * Add the ipAddress to the authorized ipAddresses |
| * |
| * @param ipAddress |
| * The ipAddress |
| */ |
| public static void addIPAddress(String ipAddress) { |
| ipMap.put(ipAddress, Instant.now()); |
| } |
| |
| /** |
| * @see #removeExpiredIP(Duration) |
| */ |
| public static void removeExpiredIP() { |
| removeExpiredIP(EXPIRE_TIME); |
| } |
| |
| /** |
| * Remove all ipAddress from the authorized map which are older then the |
| * given time |
| * |
| * @param clearTime |
| * The time in milliseconds after which an ipAddress should be |
| * handled as expired |
| */ |
| public static void removeExpiredIP(Duration clearTime) { |
| synchronized (ipMap) { |
| Iterator<String> storedIP = ipMap.keySet().iterator(); |
| |
| while (storedIP.hasNext()) { |
| String key = storedIP.next(); |
| Instant storedTime = ipMap.get(key); |
| |
| // remove the ip from the map when it is expired |
| if (Instant.now().minus(clearTime).isAfter(storedTime)) { |
| // remove the entry from the iterator first to get sure that |
| // we not get |
| // a ConcurrentModificationException |
| storedIP.remove(); |
| |
| ipMap.remove(key); |
| } |
| } |
| } |
| } |
| |
| /** |
| * Remove all ipAddresses from the authorized map |
| */ |
| public static void clearIP() { |
| ipMap.clear(); |
| } |
| } |