Refactor CMS UUID factory

[lgpl/argeo-commons.git] / org.argeo.api.uuid / src / org / argeo / api / uuid / NodeIdSupplier.java

diff --git a/org.argeo.api.uuid/src/org/argeo/api/uuid/NodeIdSupplier.java b/org.argeo.api.uuid/src/org/argeo/api/uuid/NodeIdSupplier.java
index 94ec50da4b9ff76d3eb86fe94425d6e1ec9dddce..1a3cd5673e17d1504277c7c1428de4795ed30490 100644 (file)
--- a/org.argeo.api.uuid/src/org/argeo/api/uuid/NodeIdSupplier.java
+++ b/org.argeo.api.uuid/src/org/argeo/api/uuid/NodeIdSupplier.java
@@ -1,13 +1,13 @@
 package org.argeo.api.uuid;
 
+import java.security.SecureRandom;
 import java.util.function.Supplier;
 
 /** A factory for node id base */
 public interface NodeIdSupplier extends Supplier<Long> {
        static long toNodeIdBase(byte[] node) {
                assert node.length == 6;
-               return UuidFactory.LEAST_SIG_RFC4122_VARIANT
-                               | (node[0] & 0xFFL) //
+               return UuidFactory.LEAST_SIG_RFC4122_VARIANT | (node[0] & 0xFFL) //
                                | ((node[1] & 0xFFL) << 8) //
                                | ((node[2] & 0xFFL) << 16) //
                                | ((node[3] & 0xFFL) << 24) //
@@ -19,4 +19,34 @@ public interface NodeIdSupplier extends Supplier<Long> {
                return (nodeId[0] & 1) != 0;
        }
 
+       static byte[] randomNodeId() {
+               SecureRandom random = new SecureRandom();
+               byte[] nodeId = new byte[6];
+               random.nextBytes(nodeId);
+               return nodeId;
+       }
+
+       /**
+        * Force this node id to be identified as no MAC address.
+        * 
+        * @see "https://datatracker.ietf.org/doc/html/rfc4122#section-4.5"
+        */
+       static void forceToNoMacAddress(byte[] nodeId, int offset) {
+               assert nodeId != null && offset < nodeId.length;
+               nodeId[offset] = (byte) (nodeId[offset] | 1);
+       }
+
+       /*
+        * SPI UTILITIES
+        */
+       /** Guarantees that a byte array of length 6 will be returned. */
+       static byte[] toNodeIdBytes(byte[] source, int offset) {
+               if (source == null)
+                       return null;
+               if (offset < 0 || offset + 6 > source.length)
+                       throw new ArrayIndexOutOfBoundsException(offset);
+               byte[] nodeId = new byte[6];
+               System.arraycopy(source, offset, nodeId, 0, 6);
+               return nodeId;
+       }
 }