CmsUuidFactory.java

   1 package org.argeo.cms.acr;
   2
   3 import java.net.Inet4Address;
   4 import java.net.Inet6Address;
   5 import java.net.InetAddress;
   6 import java.net.InterfaceAddress;
   7 import java.net.NetworkInterface;
   8 import java.net.SocketException;
   9 import java.util.BitSet;
  10 import java.util.Enumeration;
  11
  12 import org.argeo.api.cms.CmsLog;
  13 import org.argeo.api.uuid.ConcurrentUuidFactory;
  14 import org.argeo.api.uuid.NodeIdSupplier;
  15 import org.argeo.api.uuid.UuidBinaryUtils;
  16
  17 public class CmsUuidFactory extends ConcurrentUuidFactory {
  18         private final static CmsLog log = CmsLog.getLog(CmsUuidFactory.class);
  19
  20         public CmsUuidFactory(byte[] nodeId) {
  21                 super(0, nodeId);
  22                 assert createTimeUUID().node() == BitSet.valueOf(toNodeIdBytes(nodeId, 0)).toLongArray()[0];
  23         }
  24
  25         public CmsUuidFactory() {
  26                 this(getIpBytes());
  27         }
  28
  29         /** Returns an SHA1 digest of one of the IP addresses. */
  30         protected static byte[] getIpBytes() {
  31                 Enumeration<NetworkInterface> netInterfaces = null;
  32                 try {
  33                         netInterfaces = NetworkInterface.getNetworkInterfaces();
  34                 } catch (SocketException e) {
  35                         throw new IllegalStateException(e);
  36                 }
  37                 if (netInterfaces == null)
  38                         throw new IllegalStateException("No interfaces");
  39
  40                 InetAddress selectedIpv6 = null;
  41                 InetAddress selectedIpv4 = null;
  42                 netInterfaces: while (netInterfaces.hasMoreElements()) {
  43                         NetworkInterface netInterface = netInterfaces.nextElement();
  44                         byte[] hardwareAddress = null;
  45                         try {
  46                                 hardwareAddress = netInterface.getHardwareAddress();
  47                                 if (hardwareAddress != null) {
  48                                         // first IPv6
  49                                         addr: for (InterfaceAddress addr : netInterface.getInterfaceAddresses()) {
  50                                                 InetAddress ip = addr.getAddress();
  51                                                 if (ip instanceof Inet6Address) {
  52                                                         Inet6Address ipv6 = (Inet6Address) ip;
  53                                                         if (ipv6.isAnyLocalAddress() || ipv6.isLinkLocalAddress() || ipv6.isLoopbackAddress())
  54                                                                 continue addr;
  55                                                         selectedIpv6 = ipv6;
  56                                                         break netInterfaces;
  57                                                 }
  58
  59                                         }
  60                                         // then IPv4
  61                                         addr: for (InterfaceAddress addr : netInterface.getInterfaceAddresses()) {
  62                                                 InetAddress ip = addr.getAddress();
  63                                                 if (ip instanceof Inet4Address) {
  64                                                         Inet4Address ipv4 = (Inet4Address) ip;
  65                                                         if (ipv4.isAnyLocalAddress() || ipv4.isLinkLocalAddress() || ipv4.isLoopbackAddress())
  66                                                                 continue addr;
  67                                                         selectedIpv4 = ipv4;
  68                                                 }
  69
  70                                         }
  71                                 }
  72                         } catch (SocketException e) {
  73                                 throw new IllegalStateException(e);
  74                         }
  75                 }
  76                 InetAddress selectedIp = selectedIpv6 != null ? selectedIpv6 : selectedIpv4;
  77                 if (selectedIp == null) {
  78                         log.warn("No IP address found, using a random node id for UUID generation");
  79                         return NodeIdSupplier.randomNodeId();
  80                 }
  81                 byte[] digest = sha1(selectedIp.getAddress());
  82                 log.info("Use IP " + selectedIp + " hashed as " + UuidBinaryUtils.toHexString(digest) + " as node id");
  83                 byte[] nodeId = toNodeIdBytes(digest, 0);
  84                 // marks that this is not based on MAC address
  85                 forceToNoMacAddress(nodeId, 0);
  86                 return nodeId;
  87         }
  88
  89 }