Migrate client examples

- Build both sec-client-rest-template and sec-server-client-auth
- Migrate HttpClient 4.x to 5.x
- Relates #165

spring-security-kerberos-samples/sec-server-client-auth/sec-server-client-auth.gradle

@@ -0,0 +1,22 @@
+plugins {
+	id 'org.springframework.security.kerberos.sample'
+	id 'org.springframework.boot'
+	id 'io.spring.dependency-management'
+}
+
+description = 'Security Server Client Auth Sample'
+
+dependencies {
+	management platform(project(":spring-security-kerberos-management"))
+	implementation project(':spring-security-kerberos-core')
+	implementation project(':spring-security-kerberos-web')
+	implementation 'org.springframework.security:spring-security-config'
+	implementation 'org.thymeleaf.extras:thymeleaf-extras-springsecurity6'
+	implementation 'org.springframework.boot:spring-boot-starter'
+	implementation 'org.springframework.boot:spring-boot-starter-web'
+	implementation 'org.springframework.boot:spring-boot-starter-thymeleaf'
+	testImplementation 'org.springframework:spring-test'
+	testImplementation 'org.junit.jupiter:junit-jupiter'
+	testImplementation 'org.mockito:mockito-junit-jupiter'
+	testImplementation 'org.assertj:assertj-core'
+}

spring-security-kerberos-samples/sec-server-client-auth/src/main/java/demo/app/Application.java

@@ -1,16 +1,27 @@
+/*
+ * Copyright 2023 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
+ *
+ *      https://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 demo.app;
 
 import org.springframework.boot.SpringApplication;
-import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
-import org.springframework.boot.autoconfigure.security.SecurityAutoConfiguration;
 
 @SpringBootApplication
-@EnableAutoConfiguration(exclude = SecurityAutoConfiguration.class)
 public class Application {
 
     public static void main(String[] args) throws Throwable {
         SpringApplication.run(Application.class, args);
     }
-
 }

spring-security-kerberos-samples/sec-server-client-auth/src/main/java/demo/app/DummyUserDetailsService.java

@@ -0,0 +1,30 @@
+/*
+ * Copyright 2023 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
+ *
+ *      https://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 demo.app;
+
+import org.springframework.security.core.authority.AuthorityUtils;
+import org.springframework.security.core.userdetails.User;
+import org.springframework.security.core.userdetails.UserDetails;
+import org.springframework.security.core.userdetails.UserDetailsService;
+import org.springframework.security.core.userdetails.UsernameNotFoundException;
+
+public class DummyUserDetailsService implements UserDetailsService {
+
+	@Override
+	public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
+		return new User(username, "{noop}notUsed", true, true, true, true, AuthorityUtils.createAuthorityList("ROLE_USER"));
+	}
+}

spring-security-kerberos-samples/sec-server-client-auth/src/main/java/demo/app/MvcConfig.java

@@ -1,11 +1,26 @@
+/*
+ * Copyright 2023 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
+ *
+ *      https://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 demo.app;
 
 import org.springframework.context.annotation.Configuration;
 import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;
-import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
+import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
 
 @Configuration
-public class MvcConfig extends WebMvcConfigurerAdapter {
+public class MvcConfig implements WebMvcConfigurer {
 
     @Override
     public void addViewControllers(ViewControllerRegistry registry) {
@@ -14,5 +29,4 @@ public class MvcConfig extends WebMvcConfigurerAdapter {
         registry.addViewController("/hello").setViewName("hello");
         registry.addViewController("/login").setViewName("login");
     }
-
 }

spring-security-kerberos-samples/sec-server-client-auth/src/main/java/demo/app/WebSecurityConfig.java

@@ -1,38 +1,47 @@
+/*
+ * Copyright 2023 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
+ *
+ *      https://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 demo.app;
 
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
-import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
 import org.springframework.security.config.annotation.web.builders.HttpSecurity;
-import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
-import org.springframework.security.config.annotation.web.servlet.configuration.EnableWebMvcSecurity;
+import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
 import org.springframework.security.kerberos.authentication.KerberosAuthenticationProvider;
 import org.springframework.security.kerberos.authentication.sun.SunJaasKerberosClient;
-
-import demo.DummyUserDetailsService;
+import org.springframework.security.web.SecurityFilterChain;
 
 @Configuration
-@EnableWebMvcSecurity
-public class WebSecurityConfig extends WebSecurityConfigurerAdapter {
+@EnableWebSecurity
+public class WebSecurityConfig {
 
-	@Override
-	protected void configure(HttpSecurity http) throws Exception {
+	@Bean
+	public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
 		http
-			.authorizeRequests()
-				.antMatchers("/", "/home").permitAll()
+			.authorizeHttpRequests((authz) -> authz
+				.requestMatchers("/", "/home").permitAll()
 				.anyRequest().authenticated()
-				.and()
+			)
 			.formLogin()
 				.loginPage("/login").permitAll()
 				.and()
 			.logout()
-				.permitAll();
-	}
-
-	@Override
-	protected void configure(AuthenticationManagerBuilder auth) throws Exception {
-		auth
+				.permitAll()
+				.and()
 			.authenticationProvider(kerberosAuthenticationProvider());
+			return http.build();
 	}
 
 	@Bean