refactored UserService to reuse functionality

application/src/main/java/org/thingsboard/server/service/entitiy/user/DefaultUserService.java

@@ -90,16 +90,10 @@ public class DefaultUserService extends AbstractTbEntityService implements TbUse
     public UserActivationLink getActivationLink(TenantId tenantId, CustomerId customerId, UserId userId, HttpServletRequest request) throws ThingsboardException {
         UserCredentials userCredentials = userService.findUserCredentialsByUserId(tenantId, userId);
         if (!userCredentials.isEnabled() && userCredentials.getActivateToken() != null) {
-            long ttl = userCredentials.getActivationTokenTtl();
+            userCredentials = userService.refreshUserActivationToken(tenantId, userCredentials);
-            if (ttl < TimeUnit.MINUTES.toMillis(15)) { // renew link if less than 15 minutes before expiration
-                userCredentials = userService.generateUserActivationToken(userCredentials);
-                userCredentials = userService.saveUserCredentials(tenantId, userCredentials);
-                ttl = userCredentials.getActivationTokenTtl();
-                log.debug("[{}][{}] Regenerated expired user activation token", tenantId, userId);
-            }
             String baseUrl = systemSecurityService.getBaseUrl(tenantId, customerId, request);
             String link = baseUrl + "/api/noauth/activate?activateToken=" + userCredentials.getActivateToken();
-            return new UserActivationLink(link, ttl);
+            return new UserActivationLink(link, userCredentials.getActivationTokenTtl());
         } else {
             throw new ThingsboardException("User is already activated!", ThingsboardErrorCode.BAD_REQUEST_PARAMS);
         }

common/dao-api/src/main/java/org/thingsboard/server/dao/user/UserService.java

@@ -63,6 +63,8 @@ public interface UserService extends EntityDaoService {
 
     UserCredentials generateUserActivationToken(UserCredentials userCredentials);
 
+    UserCredentials refreshUserActivationToken(TenantId tenantId, UserCredentials userCredentials);
+
     UserCredentials replaceUserCredentials(TenantId tenantId, UserCredentials userCredentials);
 
     void deleteUser(TenantId tenantId, User user);

dao/src/main/java/org/thingsboard/server/dao/user/UserServiceImpl.java

@@ -300,6 +300,16 @@ public class UserServiceImpl extends AbstractCachedEntityService<UserCacheKey, U
         return userCredentials;
     }
 
+    @Override
+    public UserCredentials refreshUserActivationToken(TenantId tenantId, UserCredentials userCredentials) {
+        if (userCredentials.getActivationTokenTtl() < TimeUnit.MINUTES.toMillis(15)) { // renew link if less than 15 minutes before expiration
+            userCredentials = generateUserActivationToken(userCredentials);
+            userCredentials = saveUserCredentials(tenantId, userCredentials);
+        }
+        log.debug("[{}][{}] Regenerated expired user activation token", tenantId, userCredentials.getUserId());
+        return userCredentials;
+    }
+
     @Override
     public UserCredentials replaceUserCredentials(TenantId tenantId, UserCredentials userCredentials) {
         log.trace("Executing replaceUserCredentials [{}]", userCredentials);