122. Developer Guide
TODO: overview of writing custom integrations
TODO: document writing Custom Route Predicate Factories
In order to write a GatewayFilter you will need to implement GatewayFilterFactory
. There is an abstract class called AbstractGatewayFilterFactory
which you can extend.
PreGatewayFilterFactory.java.
public class PreGatewayFilterFactory extends AbstractGatewayFilterFactory<PreGatewayFilterFactory.Config> { public PreGatewayFilterFactory() { super(Config.class); } @Override public GatewayFilter apply(Config config) { // grab configuration from Config object return (exchange, chain) -> { //If you want to build a "pre" filter you need to manipulate the //request before calling chain.filter ServerHttpRequest.Builder builder = exchange.getRequest().mutate(); //use builder to manipulate the request return chain.filter(exchange.mutate().request(request).build()); }; } public static class Config { //Put the configuration properties for your filter here } }
PostGatewayFilterFactory.java.
public class PostGatewayFilterFactory extends AbstractGatewayFilterFactory<PostGatewayFilterFactory.Config> { public PostGatewayFilterFactory() { super(Config.class); } @Override public GatewayFilter apply(Config config) { // grab configuration from Config object return (exchange, chain) -> { return chain.filter(exchange).then(Mono.fromRunnable(() -> { ServerHttpResponse response = exchange.getResponse(); //Manipulate the response in some way })); }; } public static class Config { //Put the configuration properties for your filter here } }