Added support for administrator group (can access all nodes)

src/main/java/it/inaf/oats/vospace/datamodel/NodeUtils.java

@@ -165,6 +165,10 @@ public class NodeUtils {
                 return false;
             }
 
+            if (userGroups.contains("VOSpace.ADMIN")) {
+                return true;
+            }
+
             List<String> groupAccessPropValues
                     = NodeProperties.getNodePropertyAsListByURI(myNode,
                             accessPropertyName);

src/test/java/it/inaf/oats/vospace/datamodel/NodeUtilsTest.java

@@ -248,6 +248,20 @@ public class NodeUtilsTest {
         assertFalse(NodeUtils.checkIfWritable(node, "user2", List.of()));
     }
 
+    @Test
+    public void testCheckWritableNoProperty() {
+
+        Node node = new DataNode();
+        assertFalse(NodeUtils.checkIfWritable(node, "user2", List.of("group1")));
+    }
+
+    @Test
+    public void testCheckAdminCanAlwaysAccess() {
+
+        Node node = new DataNode();
+        assertTrue(NodeUtils.checkIfWritable(node, "user2", List.of("VOSpace.ADMIN")));
+    }
+
     @Test
     public void testGetVosPath() {