REPO-1305: Delete a group

- restrict delete group to group authority

git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/BRANCHES/DEV/5.2.N/root@134747 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/rest/api/impl/GroupsImpl.java

@@ -528,6 +528,11 @@ public class GroupsImpl implements Groups
 
     public void delete(String groupId, Parameters parameters)
     {
+        if (!isGroupAuthority(groupId))
+        {
+            throw new InvalidArgumentException("Invalid group id: " + groupId);
+        }
+
         // Get cascade param - default false (if not provided).
         boolean cascade = Boolean.valueOf(parameters.getParameter(PARAM_CASCADE));
 
@@ -741,4 +746,10 @@ public class GroupsImpl implements Groups
 
         return (name != null && authorityService.authorityExists(name));
     }
+
+    private boolean isGroupAuthority(String authorityName)
+    {
+        AuthorityType authorityType = AuthorityType.getAuthorityType(authorityName);
+        return AuthorityType.GROUP.equals(authorityType) || AuthorityType.EVERYONE.equals(authorityType);
+    }
 }