Update WebFlux samples to use Spring Boot

Fixes: gh-5411

samples/boot/hellowebflux-method/src/main/java/sample/HelloWebfluxMethodApplication.java

@@ -0,0 +1,32 @@
+/*
+ * 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.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+/**
+ * @author Rob Winch
+ * @since 5.0
+ */
+@SpringBootApplication
+public class HelloWebfluxMethodApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(HelloWebfluxMethodApplication.class, args);
+	}
+}

samples/boot/hellowebflux-method/src/main/java/sample/HelloWorldMessageService.java

@@ -0,0 +1,33 @@
+/*
+ * 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.security.access.prepost.PreAuthorize;
+import org.springframework.stereotype.Component;
+import reactor.core.publisher.Mono;
+
+/**
+ * @author Rob Winch
+ * @since 5.0
+ */
+@Component
+public class HelloWorldMessageService {
+	@PreAuthorize("hasRole('ADMIN')")
+	public Mono<String> findMessage() {
+		return Mono.just("Hello World!");
+	}
+}

samples/boot/hellowebflux-method/src/main/java/sample/MessageController.java

@@ -0,0 +1,39 @@
+/*
+ * 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.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+import reactor.core.publisher.Mono;
+
+/**
+ * @author Rob Winch
+ * @since 5.0
+ */
+@RestController
+public class MessageController {
+	private final HelloWorldMessageService messages;
+
+	public MessageController(HelloWorldMessageService messages) {
+		this.messages = messages;
+	}
+
+	@GetMapping("/message")
+	public Mono<String> message() {
+		return this.messages.findMessage();
+	}
+}

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

@@ -0,0 +1,56 @@
+/*
+ * 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.MapReactiveUserDetailsService;
+import org.springframework.security.config.annotation.web.reactive.EnableWebFluxSecurity;
+import org.springframework.security.config.web.server.ServerHttpSecurity;
+import org.springframework.security.core.userdetails.User;
+import org.springframework.security.core.userdetails.UserDetails;
+import org.springframework.security.web.server.SecurityWebFilterChain;
+
+/**
+ * @author Rob Winch
+ * @since 5.0
+ */
+@EnableWebFluxSecurity
+@EnableReactiveMethodSecurity
+public class SecurityConfig {
+
+	@Bean
+	SecurityWebFilterChain springWebFilterChain(ServerHttpSecurity http) throws Exception {
+		return http
+			// Demonstrate that method security works
+			// Best practice to use both for defense in depth
+			.authorizeExchange()
+				.anyExchange().permitAll()
+				.and()
+			.httpBasic().and()
+			.build();
+	}
+
+	@Bean
+	public MapReactiveUserDetailsService userDetailsService() {
+		User.UserBuilder userBuilder = User.withDefaultPasswordEncoder();
+		UserDetails rob = userBuilder.username("rob").password("rob").roles("USER").build();
+		UserDetails admin = userBuilder.username("admin").password("admin").roles("USER", "ADMIN").build();
+		return new MapReactiveUserDetailsService(rob, admin);
+	}
+
+}