Add hellowebflux-method sample

Fixes gh-4503

samples/javaconfig/hellowebflux-method/src/main/java/sample/SecurityConfig.java

@@ -0,0 +1,59 @@
+/*
+ *
+ *  * Copyright 2002-2017 the original author or authors.
+ *  *
+ *  * Licensed under the Apache License, Version 2.0 (the "License");
+ *  * you may not use this file except in compliance with the License.
+ *  * You may obtain a copy of the License at
+ *  *
+ *  *      http://www.apache.org/licenses/LICENSE-2.0
+ *  *
+ *  * Unless required by applicable law or agreed to in writing, software
+ *  * distributed under the License is distributed on an "AS IS" BASIS,
+ *  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  * See the License for the specific language governing permissions and
+ *  * limitations under the License.
+ *
+ */
+
+package sample;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.security.config.annotation.method.configuration.EnableReactiveMethodSecurity;
+import org.springframework.security.core.userdetails.MapUserDetailsRepository;
+import org.springframework.security.authorization.AuthorizationDecision;
+import org.springframework.security.config.annotation.web.reactive.EnableWebFluxSecurity;
+import org.springframework.security.config.web.server.HttpSecurity;
+import org.springframework.security.core.Authentication;
+import org.springframework.security.core.userdetails.User;
+import org.springframework.security.core.userdetails.UserDetails;
+import org.springframework.security.web.server.SecurityWebFilterChain;
+import org.springframework.security.web.server.authorization.AuthorizationContext;
+import reactor.core.publisher.Mono;
+
+/**
+ * @author Rob Winch
+ * @since 5.0
+ */
+@EnableWebFluxSecurity
+@EnableReactiveMethodSecurity
+public class SecurityConfig {
+
+	@Bean
+	SecurityWebFilterChain springWebFilterChain(HttpSecurity http) throws Exception {
+		return http
+			// we rely on method security
+			.authorizeExchange()
+				.anyExchange().permitAll()
+				.and()
+			.build();
+	}
+
+	@Bean
+	public MapUserDetailsRepository userDetailsRepository() {
+		UserDetails rob = User.withUsername("rob").password("rob").roles("USER").build();
+		UserDetails admin = User.withUsername("admin").password("admin").roles("USER","ADMIN").build();
+		return new MapUserDetailsRepository(rob, admin);
+	}
+
+}