Fixes how the session interceptor is created and adds redirect url

configuration.

src/main/java/formflow/library/config/SessionContinuityInterceptorConfiguration.java

@@ -1,8 +1,11 @@
 package formflow.library.config;
 
 import formflow.library.interceptors.SessionContinuityInterceptor;
+
 import java.util.List;
+
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Value;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
@@ -17,15 +20,18 @@ public class SessionContinuityInterceptorConfiguration implements WebMvcConfigur
 
   @Autowired
   List<FlowConfiguration> flowConfigurations;
-
-
+
+  @Value("${form-flow.session-continuity-interceptor.redirect-url:/}")
+  private String redirectUrl;
+
   /**
    * Adds the SessionContinuityInterceptor to the Interceptor registry.
+   *
    * @param registry the Interceptor registry.
    */
   @Override
   public void addInterceptors(InterceptorRegistry registry) {
-    registry.addInterceptor(new SessionContinuityInterceptor(flowConfigurations))
+    registry.addInterceptor(new SessionContinuityInterceptor(flowConfigurations, redirectUrl))
         .addPathPatterns(List.of(SessionContinuityInterceptor.FLOW_PATH_FORMAT,
             SessionContinuityInterceptor.NAVIGATION_FLOW_PATH_FORMAT));
   }

src/main/java/formflow/library/interceptors/SessionContinuityInterceptor.java

@@ -22,22 +22,20 @@
 import org.springframework.web.servlet.HandlerInterceptor;
 
 /**
- * This interceptor prevents users from jumping to random pages in a flow.
+ * This interceptor prevents users with an invalid session from jumping to random pages in a flow.
  */
-@Component
 @Slf4j
 @ConditionalOnProperty(name = "form-flow.session-continuity-interceptor.enabled", havingValue = "true")
 public class SessionContinuityInterceptor implements HandlerInterceptor, Ordered {
 
   public static final String FLOW_PATH_FORMAT = ScreenController.FLOW + "/" + ScreenController.FLOW_SCREEN_PATH;
   public static final String NAVIGATION_FLOW_PATH_FORMAT = FLOW_PATH_FORMAT + "/navigation";
-
-  private final String REDIRECT_URL = "/?sessionBad=true";
-
+  private final String redirectUrl;
   public List<FlowConfiguration> flowConfigurations;
 
-  public SessionContinuityInterceptor(List<FlowConfiguration> flowConfigurations) {
+  public SessionContinuityInterceptor(List<FlowConfiguration> flowConfigurations, String redirectUrl) {
     this.flowConfigurations = flowConfigurations;
+    this.redirectUrl = redirectUrl;
   }
 
   /**
@@ -73,7 +71,7 @@ public boolean preHandle(HttpServletRequest request, @NotNull HttpServletRespons
         return true;
       }
       log.error("No active session found for request to {}. Redirecting to landing page.", request.getRequestURI());
-      response.sendRedirect(REDIRECT_URL);
+      response.sendRedirect(redirectUrl);
       return false;
     }
 
@@ -87,7 +85,7 @@ public boolean preHandle(HttpServletRequest request, @NotNull HttpServletRespons
     if (submissionId == null && !parsedUrl.get("screen").equals(firstScreen)) {
       log.error("A submission ID was not found in the session for request to {}. Redirecting to landing page.",
           request.getRequestURI());
-      response.sendRedirect(REDIRECT_URL);
+      response.sendRedirect(redirectUrl);
       return false;
     }
 

src/test/java/formflow/library/interceptors/SpyInterceptorConfig.java

@@ -2,9 +2,12 @@
 
 import formflow.library.config.FormFlowConfigurationProperties;
 import formflow.library.config.FlowConfiguration;
+
 import java.util.List;
+
 import org.mockito.Mockito;
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Value;
 import org.springframework.boot.test.context.TestConfiguration;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Primary;
@@ -15,34 +18,37 @@
 @TestConfiguration
 public class SpyInterceptorConfig implements WebMvcConfigurer {
 
-    @Autowired
-    private List<FlowConfiguration> flowConfigurations;
-
-    @Autowired
-    private FormFlowConfigurationProperties formFlowConfigurationProperties;
-
-    @Bean
-    @Primary
-    public LocaleChangeInterceptor localeChangeInterceptor() {
-        return Mockito.spy(new LocaleChangeInterceptor());
-    }
-
-    @Bean
-    @Primary // Ensure this bean takes precedence over the real one
-    public SessionContinuityInterceptor dataRequiredInterceptor() {
-        return Mockito.spy(new SessionContinuityInterceptor(flowConfigurations));
-    }
-
-    @Bean
-    @Primary
-    public DisabledFlowInterceptor disabledFlowInterceptor() {
-        return Mockito.spy(new DisabledFlowInterceptor(formFlowConfigurationProperties));
-    }
-
-    @Override
-    public void addInterceptors(InterceptorRegistry registry) {
-        registry.addInterceptor(localeChangeInterceptor());
-        registry.addInterceptor(dataRequiredInterceptor());
-        registry.addInterceptor(disabledFlowInterceptor());
-    }
+  @Autowired
+  private List<FlowConfiguration> flowConfigurations;
+
+  @Autowired
+  private FormFlowConfigurationProperties formFlowConfigurationProperties;
+
+  @Value("${form-flow.session-continuity-interceptor.redirect-url:/}")
+  private String redirectUrl;
+
+  @Bean
+  @Primary
+  public LocaleChangeInterceptor localeChangeInterceptor() {
+    return Mockito.spy(new LocaleChangeInterceptor());
+  }
+
+  @Bean
+  @Primary // Ensure this bean takes precedence over the real one
+  public SessionContinuityInterceptor dataRequiredInterceptor() {
+    return Mockito.spy(new SessionContinuityInterceptor(flowConfigurations, redirectUrl));
+  }
+
+  @Bean
+  @Primary
+  public DisabledFlowInterceptor disabledFlowInterceptor() {
+    return Mockito.spy(new DisabledFlowInterceptor(formFlowConfigurationProperties));
+  }
+
+  @Override
+  public void addInterceptors(InterceptorRegistry registry) {
+    registry.addInterceptor(localeChangeInterceptor());
+    registry.addInterceptor(dataRequiredInterceptor());
+    registry.addInterceptor(disabledFlowInterceptor());
+  }
 }