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InitializeUserDetailsBeanManagerConfigurer.java
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InitializeUserDetailsBeanManagerConfigurer.java
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/*
* Copyright 2002-2019 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 org.springframework.security.config.annotation.authentication.configuration;
import org.springframework.context.ApplicationContext;
import org.springframework.core.Ordered;
import org.springframework.core.annotation.Order;
import org.springframework.security.authentication.dao.DaoAuthenticationProvider;
import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
import org.springframework.security.core.userdetails.UserDetailsPasswordService;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.crypto.password.PasswordEncoder;
/**
* Lazily initializes the global authentication with a {@link UserDetailsService} if it is
* not yet configured and there is only a single Bean of that type. Optionally, if a
* {@link PasswordEncoder} is defined will wire this up too.
*
* @author Rob Winch
* @since 4.1
*/
@Order(InitializeUserDetailsBeanManagerConfigurer.DEFAULT_ORDER)
class InitializeUserDetailsBeanManagerConfigurer extends GlobalAuthenticationConfigurerAdapter {
static final int DEFAULT_ORDER = Ordered.LOWEST_PRECEDENCE - 5000;
private final ApplicationContext context;
/**
* @param context
*/
InitializeUserDetailsBeanManagerConfigurer(ApplicationContext context) {
this.context = context;
}
@Override
public void init(AuthenticationManagerBuilder auth) throws Exception {
auth.apply(new InitializeUserDetailsManagerConfigurer());
}
class InitializeUserDetailsManagerConfigurer extends GlobalAuthenticationConfigurerAdapter {
@Override
public void configure(AuthenticationManagerBuilder auth) throws Exception {
if (auth.isConfigured()) {
return;
}
UserDetailsService userDetailsService = getBeanOrNull(UserDetailsService.class);
if (userDetailsService == null) {
return;
}
PasswordEncoder passwordEncoder = getBeanOrNull(PasswordEncoder.class);
UserDetailsPasswordService passwordManager = getBeanOrNull(UserDetailsPasswordService.class);
DaoAuthenticationProvider provider = new DaoAuthenticationProvider();
provider.setUserDetailsService(userDetailsService);
if (passwordEncoder != null) {
provider.setPasswordEncoder(passwordEncoder);
}
if (passwordManager != null) {
provider.setUserDetailsPasswordService(passwordManager);
}
provider.afterPropertiesSet();
auth.authenticationProvider(provider);
}
/**
* @return a bean of the requested class if there's just a single registered
* component, null otherwise.
*/
private <T> T getBeanOrNull(Class<T> type) {
String[] beanNames = InitializeUserDetailsBeanManagerConfigurer.this.context.getBeanNamesForType(type);
if (beanNames.length != 1) {
return null;
}
return InitializeUserDetailsBeanManagerConfigurer.this.context.getBean(beanNames[0], type);
}
}
}