How to get user info directly at JPA level in rest

Question

I am using REST api with JPA, and getting the user information in the header section . For audit purpose need to save the user detail with each request. How to directly get the user info at JPA level (@Prepersist and @PreUpdate hooks) from rest header.

I don't want to pass the details though service layer Is there any generic way to do it ?

Note-I am not using spring.

Thanks in advance.

Answer 1

I had the similar problem with spring framework. Following idea may help you.

1. Create AppContext using ThreadLocal

   public class AppContext {
   
   private static final ThreadLocal<User> currentUser = new ThreadLocal<>();
   
   public static void setCurrentUser(String tenant) {
       currentUser.set(tenant);
   }
   
   public static String getCurrentUser() {
       return currentUser.get();
   }
   
   public static void clear() {
       currentUser.remove();
   }
   

   }

2. Use filter or similar to get user from http header and set to the AppContext

   @Override
   public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
       HttpServletRequest httpRequest = (HttpServletRequest) request;
   
        // Your code to extract user info from header
        // Build user object and set to the AppContext
        AppContext.setCurrentUser(user);
   
       //doFilter
       chain.doFilter(httpRequest, response);
   }
   

3. Use AppContext on the repository. It should available on request scope.

     @PrePersist
     public void onPrePersist() {
       if(AppContext.getCurrentUser() != null){
           this.user = AppContext.getCurrentUser();
        }
   }
   

   }