<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-security</artifactId>
</dependency>

<dependencies>
  // ...省略其他依賴
  <dependency>
      <groupId>org.springframework.security</groupId>
      <artifactId>spring-security-config</artifactId>
  </dependency>
  <dependency>
      <groupId>org.springframework.security</groupId>
      <artifactId>spring-security-core</artifactId>
  </dependency>
  <dependency>
      <groupId>org.springframework.security</groupId>
      <artifactId>spring-security-web</artifactId>
  </dependency>
</dependencies>
<dependencyManagement>
  <dependencies>
    <!--配置SecurityBom-->
    <dependency>
        <groupId>org.springframework.security</groupId>
        <artifactId>spring-security-bom</artifactId>
        <version>5.4.1</version>
        <type>pom</type>
        <scope>import</scope>
    </dependency>
  </dependencies>
</dependencyManagement>

public interface PasswordEncoder {
    /**
     * Encode the raw password. Generally, a good encoding algorithm applies a SHA-1 or
     * greater hash combined with an 8-byte or greater randomly generated salt.
     */
    String encode(CharSequence rawPassword);
    /**
     * Verify the encoded password obtained from storage matches the submitted raw
     * password after it too is encoded. Returns true if the passwords match, false if
     * they do not. The stored password itself is never decoded.
     *
     * @param rawPassword the raw password to encode and match
     * @param encodedPassword the encoded password from storage to compare with
     * @return true if the raw password, after encoding, matches the encoded password from
     * storage
     */
    boolean matches(CharSequence rawPassword, String encodedPassword);
    /**
     * Returns true if the encoded password should be encoded again for better security,
     * else false. The default implementation always returns false.
     * @param encodedPassword the encoded password to check
     * @return true if the encoded password should be encoded again for better security,
     * else false.
     */
    default boolean upgradeEncoding(String encodedPassword) {
        return false;
    }
}

// {bcrypt}格式會委托給BCryptPasswordEncoder加密類
{bcrypt}$2a$10$iMz8sMVMiOgRgXRuREF/f.ChT/rpu2ZtitfkT5CkDbZpZlFhLxO3y
// {pbkdf2}格式會委托給Pbkdf2PasswordEncoder加密類
{pbkdf2}cc409867e39f011f6332bbb6634f58e98d07be7fceefb4cc27e62501594d6ed0b271a25fd9f7fc2e
// {MD5}格式會委托給MessageDigestPasswordEncoder加密類
{MD5}e10adc3949ba59abbe56e057f20f883e
// {noop}明文方式，委托給NoOpPasswordEncoder
{noop}123456
// ...

@Configuration
@EnableWebSecurity
public class WebSecurityConfiguration extends WebSecurityConfigurerAdapter {
    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http
                .formLogin()
                .and()
                .csrf()
                .disable()
                .authorizeRequests()
                .antMatchers("/**")
                .authenticated();
    }
    @Bean
    public UserDetailsService users() {
        // {MD5}value必須大寫，value值必須是32位小寫
        // admin
        UserDetails admin = User.builder()
                //.passwordEncoder(encoder::encode)
                .username("admin").password(
                        "{MD5}e10adc3949ba59abbe56e057f20f883e"
                ).roles("admin").build();
        // hengboy
        UserDetails hengboy = User.builder()
                .username("hengboy")
                .password("{bcrypt}$2a$10$iMz8sMVMiOgRgXRuREF/f.ChT/rpu2ZtitfkT5CkDbZpZlFhLxO3y")
                .roles("admin")
                .build();
        // yuqiyu
        UserDetails yuqiyu = User.builder().username("yuqiyu")
                //.password("{noop}123456")
                .password("{pbkdf2}cc409867e39f011f6332bbb6634f58e98d07be7fceefb4cc27e62501594d6ed0b271a25fd9f7fc2e")
                .roles("user").build();
        return new InMemoryUserDetailsManager(admin, yuqiyu, hengboy);
    }
}

public static PasswordEncoder createDelegatingPasswordEncoder() {
  String encodingId = "bcrypt";
  Map<String, PasswordEncoder> encoders = new HashMap<>();
  encoders.put(encodingId, new BCryptPasswordEncoder());
  // 省略...
  return new DelegatingPasswordEncoder(encodingId, encoders);
}

@Bean
public PasswordEncoder passwordEncoder() {
  return new BCryptPasswordEncoder();
}