Small security improvements (#1412)

Typos fixed

Disables empty string gateway token for sure. Test if the gateway token is not empty string ecplicitly.
Empty string is the default value and if accepted could be a security vulnerability (e.g. enabling gateway token
authentication and using empty string as token). According to https://datatracker.ietf.org/doc/html/rfc7230#section-3.2.4
the header value shall not have trailing spaces and the http server shall already have trimmed them. So if execution passes
start with "GatewayToken " then token shall not be empty. But but let's check anyway

In UI first set key then enable the gateway token authentication. Otherwise the key might be left empty (default). This however
shall not be really problem since (because of token trimming) the empty token will be rejected anyway.

Signed-off-by: Marinov Avgustin <Avgustin.Marinov@bosch.com>

hawkbit-ui/src/main/java/org/eclipse/hawkbit/ui/tenantconfiguration/AuthenticationConfigurationView.java

@@ -165,6 +165,11 @@ public class AuthenticationConfigurationView extends BaseConfigurationView<Proxy
 
     @Override
     public void save() {
+        if (getBinderBean().isGatewaySecToken()) {
+            writeConfigOption(TenantConfigurationKey.AUTHENTICATION_MODE_GATEWAY_SECURITY_TOKEN_KEY,
+                    getBinderBean().getGatewaySecurityToken());
+        }
+
         writeConfigOption(TenantConfigurationKey.AUTHENTICATION_MODE_TARGET_SECURITY_TOKEN_ENABLED,
                 getBinderBean().isTargetSecToken());
         writeConfigOption(TenantConfigurationKey.AUTHENTICATION_MODE_GATEWAY_SECURITY_TOKEN_ENABLED,
@@ -172,11 +177,6 @@ public class AuthenticationConfigurationView extends BaseConfigurationView<Proxy
         writeConfigOption(TenantConfigurationKey.ANONYMOUS_DOWNLOAD_MODE_ENABLED,
                 getBinderBean().isDownloadAnonymous());
 
-        if (getBinderBean().isGatewaySecToken()) {
-            writeConfigOption(TenantConfigurationKey.AUTHENTICATION_MODE_GATEWAY_SECURITY_TOKEN_KEY,
-                    getBinderBean().getGatewaySecurityToken());
-        }
-
         writeConfigOption(TenantConfigurationKey.AUTHENTICATION_MODE_HEADER_ENABLED,
                 getBinderBean().isCertificateAuth());
         if (getBinderBean().isCertificateAuth()) {