Class CorsGatewayFilterApplicationListener

java.lang.Object

org.springframework.cloud.gateway.filter.cors.CorsGatewayFilterApplicationListener

All Implemented Interfaces:

EventListener, org.springframework.context.ApplicationListener<RefreshRoutesResultEvent>

public class CorsGatewayFilterApplicationListener
extends Object
implements org.springframework.context.ApplicationListener<RefreshRoutesResultEvent>

For each Route, this listener inspects its predicates and looks for an instance of PathRoutePredicateFactory. If a path predicate is found, the first defined path pattern is extracted and used as the key for associating the route-specific CorsConfiguration.

After collecting all route-level CORS configurations, the listener merges them with globally defined configurations from GlobalCorsProperties, ensuring that route-specific configurations take precedence over global ones in case of conflicts (e.g., both defining CORS rules for /**).

The merged configuration map is then applied to the RoutePredicateHandlerMapping via setCorsConfigurations.

Note: A LinkedHashMap is used to store the merged configurations to preserve insertion order, which ensures predictable CORS resolution when multiple path patterns could match a request.

Author:

Fredrich Ombico, Abel Salgado Romero, Yavor Chamov

Constructor Summary

Constructors

Constructor	Description
CorsGatewayFilterApplicationListener(GlobalCorsProperties globalCorsProperties, RoutePredicateHandlerMapping routePredicateHandlerMapping, RouteLocator routeLocator)

Method Summary

Modifier and Type	Method	Description
void	onApplicationEvent(RefreshRoutesResultEvent event)

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.springframework.context.ApplicationListener

supportsAsyncExecution

Constructor Details

CorsGatewayFilterApplicationListener

public CorsGatewayFilterApplicationListener(GlobalCorsProperties globalCorsProperties,
 RoutePredicateHandlerMapping routePredicateHandlerMapping,
 RouteLocator routeLocator)

Method Details

onApplicationEvent

public void onApplicationEvent(RefreshRoutesResultEvent event)

Specified by:

onApplicationEvent in interface org.springframework.context.ApplicationListener<RefreshRoutesResultEvent>