From b297ab231cd20dfe31a6b49b30f6f1dfff67207d Mon Sep 17 00:00:00 2001
From: nickAS21 <nick@thingsboard.io>
Date: Thu, 16 Sep 2021 08:43:28 +0300
Subject: [PATCH] Lwm2m Fix bug  create new Device with X509 Trust / update
 credential to X509 trust

---
 .../org/thingsboard/server/common/data/StringUtils.java   | 8 ++++++++
 .../server/dao/device/DeviceCredentialsServiceImpl.java   | 4 ++--
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/common/data/src/main/java/org/thingsboard/server/common/data/StringUtils.java b/common/data/src/main/java/org/thingsboard/server/common/data/StringUtils.java
index cbe7094715..6e96893c22 100644
--- a/common/data/src/main/java/org/thingsboard/server/common/data/StringUtils.java
+++ b/common/data/src/main/java/org/thingsboard/server/common/data/StringUtils.java
@@ -21,7 +21,15 @@ public class StringUtils {
         return source == null || source.isEmpty();
     }
 
+    public static boolean isBlank(String source) {
+        return source == null || source.isEmpty() || source.trim().isEmpty();
+    }
+
     public static boolean isNotEmpty(String source) {
         return source != null && !source.isEmpty();
     }
+
+    public static boolean isNotBlank(String source) {
+        return source != null && !source.isEmpty() && !source.trim().isEmpty();
+    }
 }
diff --git a/dao/src/main/java/org/thingsboard/server/dao/device/DeviceCredentialsServiceImpl.java b/dao/src/main/java/org/thingsboard/server/dao/device/DeviceCredentialsServiceImpl.java
index f62d25dcec..969745ae31 100644
--- a/dao/src/main/java/org/thingsboard/server/dao/device/DeviceCredentialsServiceImpl.java
+++ b/dao/src/main/java/org/thingsboard/server/dao/device/DeviceCredentialsServiceImpl.java
@@ -183,7 +183,7 @@ public class DeviceCredentialsServiceImpl extends AbstractEntityService implemen
                 break;
             case X509:
                 X509ClientCredentials x509Config = (X509ClientCredentials) clientCredentials;
-                if (x509Config.getCert() != null) {
+                if ((StringUtils.isNotBlank(x509Config.getCert()))) {
                     String cert = EncryptionUtil.trimNewLines(x509Config.getCert());
                     String sha3Hash = EncryptionUtil.getSha3Hash(cert);
                     x509Config.setCert(cert);
@@ -272,7 +272,7 @@ public class DeviceCredentialsServiceImpl extends AbstractEntityService implemen
                 break;
             case X509:
                 X509ClientCredentials x509CCredentials = (X509ClientCredentials) clientCredentials;
-                if (x509CCredentials.getCert() != null) {
+                if (StringUtils.isNotBlank(x509CCredentials.getCert())) {
                     try {
                         SecurityUtil.certificate.decode(Base64.decodeBase64(x509CCredentials.getCert()));
                     } catch (Exception e) {