reimplement "fix flow for loggedout checkout" ( b25a9842e4 )

prototype/src/main/java/org/hso/ecommerce/app/RequestController.java

@@ -31,9 +31,14 @@ public class RequestController {
     }
 
     @PostMapping("/login")
-    public String loginPost(HttpServletResponse response) {
-        response.addCookie(new Cookie("login", "true"));
-      return "redirect:/";
+    public String loginPost(HttpServletResponse response, @RequestParam(value = "goto", required = false) String gto) {
+      response.addCookie(new Cookie("login", "true"));
+
+      if (gto != null && gto.startsWith("/")) {
+           return "redirect:" + gto;
+      } else {
+           return "redirect:/";
+      }
     }
 
     @PostMapping("/logout")
@@ -77,8 +82,12 @@ public class RequestController {
     }
 
     @PostMapping("/shop/articles/{id}")
-     public String shopArticlesByIdBuy(HttpServletResponse response) {
-         return "redirect:/shop/checkout";
+     public String shopArticlesByIdBuy(@RequestAttribute("customer") Boolean isCustomer, @PathVariable("id") Integer id) {
+        if (isCustomer) {
+           return "redirect:/shop/checkout";
+        } else {
+           return "redirect:/login?goto=%2Fshop%2Farticles%2F"+id;
+        }
      }
 
     @GetMapping("/user/")

prototype/src/main/java/org/hso/ecommerce/components/LoginIntercepter.java

@@ -21,10 +21,11 @@ public class LoginIntercepter implements HandlerInterceptor {
             for (Cookie c : cookies) {
                 if (c.getName().equals("login")) {
                     request.setAttribute("customer", c.getValue().equals("true"));
+                    return true;
                 }
             }
         }
-
+        request.setAttribute("customer", false);
         return true;
     }
     @Override