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   1 /**
   2  * Copyright (c) 2010-2022 Contributors to the openHAB project
   3  *
   4  * See the NOTICE file(s) distributed with this work for additional
   5  * information.
   6  *
   7  * This program and the accompanying materials are made available under the
   8  * terms of the Eclipse Public License 2.0 which is available at
   9  * http://www.eclipse.org/legal/epl-2.0
  10  *
  11  * SPDX-License-Identifier: EPL-2.0
  12  */
  13 package org.openhab.binding.mercedesme.internal.server;
  14
  15 import java.net.InetAddress;
  16 import java.net.NetworkInterface;
  17 import java.net.SocketException;
  18 import java.util.ArrayList;
  19 import java.util.Enumeration;
  20 import java.util.List;
  21
  22 import org.eclipse.jdt.annotation.NonNullByDefault;
  23 import org.openhab.binding.mercedesme.internal.Constants;
  24 import org.slf4j.Logger;
  25 import org.slf4j.LoggerFactory;
  26
  27 /**
  28  * The {@link Utils} class defines an HTTP Server for authentication callbacks
  29  *
  30  * @author Bernd Weymann - Initial contribution
  31  */
  32 @NonNullByDefault
  33 public class Utils {
  34     private static final Logger LOGGER = LoggerFactory.getLogger(Utils.class);
  35     private static final List<Integer> PORTS = new ArrayList<Integer>();
  36     private static int port = 8090;
  37
  38     /**
  39      * Get free port without other Thread interference
  40      *
  41      * @return
  42      */
  43     public static synchronized int getFreePort() {
  44         while (PORTS.contains(port)) {
  45             port++;
  46         }
  47         PORTS.add(port);
  48         return port;
  49     }
  50
  51     public static synchronized void addPort(int portNr) {
  52         if (PORTS.contains(portNr)) {
  53             LOGGER.warn("Port {} already occupied", portNr);
  54         }
  55         PORTS.add(portNr);
  56     }
  57
  58     public static synchronized void removePort(int portNr) {
  59         PORTS.remove(Integer.valueOf(portNr));
  60     }
  61
  62     public static String getCallbackIP() throws SocketException {
  63         // https://stackoverflow.com/questions/1062041/ip-address-not-obtained-in-java
  64         for (Enumeration<NetworkInterface> ifaces = NetworkInterface.getNetworkInterfaces(); ifaces
  65                 .hasMoreElements();) {
  66             NetworkInterface iface = ifaces.nextElement();
  67             try {
  68                 if (!iface.isLoopback()) {
  69                     if (iface.isUp()) {
  70                         for (Enumeration<InetAddress> addresses = iface.getInetAddresses(); addresses
  71                                 .hasMoreElements();) {
  72                             InetAddress address = addresses.nextElement();
  73                             return address.getHostAddress();
  74                         }
  75                     }
  76                 }
  77             } catch (SocketException se) {
  78                 // Calling one network interface failed - continue searching
  79                 LOGGER.trace("Network {} failed {}", iface.getName(), se.getMessage());
  80             }
  81         }
  82         throw new SocketException("IP address not detected");
  83     }
  84
  85     public static String getCallbackAddress(String callbackIP, int callbackPort) {
  86         return "http://" + callbackIP + Constants.COLON + callbackPort + Constants.CALLBACK_ENDPOINT;
  87     }
  88 }