gataway断言源码剖析

public class CookieRoutePredicateFactory

        extends AbstractRoutePredicateFactory<CookieRoutePredicateFactory.Config> {

    /**

     * Name key.

     */

    public static final String NAME_KEY = "name";

    /**

     * Regexp key.

     */

    public static final String REGEXP_KEY = "regexp";

    public CookieRoutePredicateFactory() {

        super(Config.class);

    }

    /*

      通过shortcutFieldOrder方法设置Config配置类中的属性,需要根据具体的规则来设置

      通过shortcutType方法获取具体规则，具体参看：org.springframework.cloud.gateway.support.ShortcutConfigurable.ShortcutType

      规则包括以下几种：

        DEFAULT : 按照shortcutFieldOrder顺序依次赋值

    */

    @Override

    public List<String> shortcutFieldOrder() {

        return Arrays.asList(NAME_KEY, REGEXP_KEY);

    }

    @Override

    public Predicate<ServerWebExchange> apply(Config config) {

        return new GatewayPredicate() {

            @Override

            public boolean test(ServerWebExchange exchange) {

                List<HttpCookie> cookies = exchange.getRequest().getCookies()

                        .get(config.name);

                if (cookies == null) {

                    return false;

                }

                for (HttpCookie cookie : cookies) {

                    if (cookie.getValue().matches(config.regexp)) {

                        return true;

                    }

                }

                return false;

            }

            @Override

            public String toString() {

                return String.format("Cookie: name=%s regexp=%s", config.name,

                        config.regexp);

            }

        };

    }

    /*

     内部配置类是用来接收在配置文件中配置的参数的

      routes:

        #唯一标识符

        - id: hailtaxi-driver

          uri: lb://hailtaxi-driver

          #路由断言

          predicates:

            - Cookie=username,itheima

    */

    @Validated

    public static class Config {

        @NotEmpty

        private String name;

        @NotEmpty

        private String regexp;

        public String getName() {

            return name;

        }

        public Config setName(String name) {

            this.name = name;

            return this;

        }

        public String getRegexp() {

            return regexp;

        }

        public Config setRegexp(String regexp) {

            this.regexp = regexp;

            return this;

        }

    }

}

 gateway:

      #路由配置

      routes:

        #唯一标识符

        - id: hailtaxi-driver

          uri: lb://hailtaxi-driver

          #路由断言

          predicates:

            # 自定义一个Token断言,如果请求包含Authorization的token信息则通过

            - Token=Authorization

@Slf4j

@Component // 要交给spring容器管理

public class TokenRoutePredicateFactory extends AbstractRoutePredicateFactory<TokenRoutePredicateFactory.Config> {

    public TokenRoutePredicateFactory() {

        super(Config.class);

    }

    public Predicate<ServerWebExchange> apply(Config config) {

        return exchange -> {

            // 打印配置文件参数值

            String headerName = config.getHeaderName();

            HttpHeaders headers = exchange.getRequest().getHeaders();

            List<String> header = headers.get(headerName);

            log.info("Token Predicate headers:{}", header);

            // 断言返回的是boolean值

            return header!=null && header.size()>0;

        };

    }

    @Override

    public List<String> shortcutFieldOrder() {

        return Arrays.asList("headerName");//指定配置文件中加载到的配置信息应填充到Config的哪个属性上

    }

    @Override

    public ShortcutType shortcutType() {

        return ShortcutType.DEFAULT;

    }

    @Data

    public static class Config { //static class

        private String headerName;//存储从配置文件中加载的配置

    }

}