Improve unit tests and sonar fixes

Add more test to CryptoUtilsTest and JsonUtilsTest.
Correct sonar issue in CldsServiceItCase test - checking if stream is not null.
Remove unused import in CldsHealthcheckServiceItCase.
Remove unused field in DocumentBuilderTest.
Add private constructor in PrincipalUtils and XmlTools.
Add FEATURE_SECURE_PROCESSING feature to TransformerFactory.

Change-Id: Ieeb561352697c131ebf11bc43162f63ea7096e81
Issue-ID: CLAMP-355
Signed-off-by: Krystian Kedron <k.kedron@partner.samsung.com>

3 files changed, 15 insertions, 1 deletions

diff --git a/src/main/java/org/onap/clamp/clds/util/CryptoUtils.java b/src/main/java/org/onap/clamp/clds/util/CryptoUtils.java
index f08bf7b28..85aae0a5d 100644
--- a/src/main/java/org/onap/clamp/clds/util/CryptoUtils.java
+++ b/src/main/java/org/onap/clamp/clds/util/CryptoUtils.java
@@ -162,7 +162,7 @@ public final class CryptoUtils {
     private static SecretKeySpec readSecretKeySpec(String propertiesFileName) {
         Properties props = new Properties();
         try {
-            //Workaround fix to make encryption key configurable
+            // Workaround fix to make encryption key configurable
             // System environment variable takes precedence for over clds/key.properties
             String encryptionKey = System.getenv(AES_ENCRYPTION_KEY);
             if(encryptionKey != null && encryptionKey.trim().length() > 0) {
diff --git a/src/main/java/org/onap/clamp/clds/util/XmlTools.java b/src/main/java/org/onap/clamp/clds/util/XmlTools.java
index a812fa127..a7d4ed9fb 100644
--- a/src/main/java/org/onap/clamp/clds/util/XmlTools.java
+++ b/src/main/java/org/onap/clamp/clds/util/XmlTools.java
@@ -24,6 +24,7 @@
 package org.onap.clamp.clds.util;
 
 import java.io.StringWriter;
+import javax.xml.XMLConstants;
 import javax.xml.transform.OutputKeys;
 import javax.xml.transform.Transformer;
 import javax.xml.transform.TransformerException;
@@ -39,6 +40,12 @@ import org.w3c.dom.Document;
 public class XmlTools {
 
     /**
+     * Private constructor to avoid creating instances of util class.
+     */
+    private XmlTools(){
+    }
+
+    /**
      * Transforms document to XML string.
      *
      * @param doc XML document
@@ -47,6 +54,7 @@ public class XmlTools {
     public static String exportXmlDocumentAsString(Document doc) {
         try {
             TransformerFactory tf = TransformerFactory.newInstance();
+            tf.setFeature(XMLConstants.FEATURE_SECURE_PROCESSING, true);
             Transformer transformer = tf.newTransformer();
             transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
             StringWriter writer = new StringWriter();
diff --git a/src/main/java/org/onap/clamp/util/PrincipalUtils.java b/src/main/java/org/onap/clamp/util/PrincipalUtils.java
index d6b20f30b..d6dfacbdb 100644
--- a/src/main/java/org/onap/clamp/util/PrincipalUtils.java
+++ b/src/main/java/org/onap/clamp/util/PrincipalUtils.java
@@ -38,6 +38,12 @@ public class PrincipalUtils {
     private static SecurityContext securityContext = SecurityContextHolder.getContext();
 
     /**
+     * Private constructor to avoid creating instances of util class.
+     */
+    private PrincipalUtils(){
+    }
+
+    /**
      * Get the Full name.
      *
      * @return The user name