juplo.de Git - demos/spring-boot/blob - src/main/java/de/juplo/demo/BackendVersionInterceptor.java

   1 package de.juplo.demo;
   2
   3 import jakarta.servlet.http.HttpServletRequest;
   4 import jakarta.servlet.http.HttpServletResponse;
   5 import lombok.RequiredArgsConstructor;
   6 import org.springframework.http.HttpStatus;
   7 import org.springframework.web.servlet.HandlerInterceptor;
   8
   9 import java.io.IOException;
  10
  11
  12 @RequiredArgsConstructor
  13 public class BackendVersionInterceptor implements HandlerInterceptor
  14 {
  15   public final static String BACKEND_VERSION = "X-Backend-Version";
  16
  17
  18   private final String backendVersion;
  19
  20
  21   @Override
  22   public boolean preHandle(
  23       HttpServletRequest request,
  24       HttpServletResponse response,
  25       Object handler) throws IOException
  26   {
  27     String requstedVersion = request.getHeader(BACKEND_VERSION);
  28     if (requstedVersion != null && !requstedVersion.equals(backendVersion))
  29     {
  30       response.sendError(HttpStatus.GONE.value());
  31       return false;
  32     }
  33     else
  34     {
  35       return true;
  36     }
  37   }
  38 }