SecurityConfig.java

package com.irum.apigateway.config;

import com.irum.apigateway.filter.JwtAuthenticationFilter;
import com.irum.apigateway.properties.GatewayPathProperties;
import lombok.RequiredArgsConstructor;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.config.annotation.web.reactive.EnableWebFluxSecurity;
import org.springframework.security.config.web.server.SecurityWebFiltersOrder;
import org.springframework.security.config.web.server.ServerHttpSecurity;
import org.springframework.security.web.server.SecurityWebFilterChain;
import org.springframework.web.cors.CorsConfiguration;
import org.springframework.web.cors.reactive.CorsConfigurationSource;
import org.springframework.web.cors.reactive.UrlBasedCorsConfigurationSource;

@Configuration
@EnableWebFluxSecurity
@RequiredArgsConstructor
public class SecurityConfig {

    private final GatewayPathProperties paths;
    private final JwtAuthenticationFilter jwtAuthenticationFilter;

    @Bean
    public SecurityWebFilterChain securityWebFilterChain(ServerHttpSecurity http) {
        http.csrf(ServerHttpSecurity.CsrfSpec::disable)
                .httpBasic(ServerHttpSecurity.HttpBasicSpec::disable)
                .formLogin(ServerHttpSecurity.FormLoginSpec::disable)
                .cors(cors -> cors.configurationSource(corsConfigurationSource()))
                .authorizeExchange(
                        exchange -> {
                            paths.getPublicEndpoints()
                                    .forEach(
                                            route -> {
                                                route.getMethods()
                                                        .forEach(
                                                                httpMethod -> {
                                                                    exchange.pathMatchers(
                                                                                    httpMethod,
                                                                                    route.getPath())
                                                                            .permitAll();
                                                                });
                                            });
                            exchange.anyExchange().denyAll();
                        });
        return http.addFilterAt(jwtAuthenticationFilter, SecurityWebFiltersOrder.AUTHENTICATION)
                .build();
    }

    @Bean
    public CorsConfigurationSource corsConfigurationSource() {
        CorsConfiguration config = new CorsConfiguration();
        config.setAllowCredentials(true);
        config.addAllowedHeader("*");
        config.addAllowedMethod("*");
        config.addExposedHeader("Authorization");
        config.addAllowedOrigin("http://localhost:8080");
        config.setMaxAge(3600L);

        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        source.registerCorsConfiguration("/**", config);
        return source;
    }
}