java-tutorials/spring-5-security/src/main/java/com/baeldung/securityextrafields/SecurityConfig.java

package com.baeldung.securityextrafields;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.PropertySource;
import org.springframework.security.authentication.AuthenticationProvider;
import org.springframework.security.authentication.dao.DaoAuthenticationProvider;
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.EnableWebSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.security.crypto.password.PasswordEncoder;
import org.springframework.security.web.authentication.SimpleUrlAuthenticationFailureHandler;
import org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter;

@EnableWebSecurity
@PropertySource("classpath:/application-extrafields.properties")
public class SecurityConfig extends WebSecurityConfigurerAdapter {

    @Autowired
    private UserDetailsService userDetailsService;

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        
        http
            .addFilterBefore(authenticationFilter(), UsernamePasswordAuthenticationFilter.class)
            .authorizeRequests()
                .antMatchers("/css/**", "/index").permitAll()
                .antMatchers("/user/**").authenticated()
            .and()
            .formLogin().loginPage("/login")
            .and()
            .logout()
            .logoutUrl("/logout");
    }

    public CustomAuthenticationFilter authenticationFilter() throws Exception {
        CustomAuthenticationFilter filter = new CustomAuthenticationFilter();
        filter.setAuthenticationManager(authenticationManagerBean());
        filter.setAuthenticationFailureHandler(failureHandler());
        return filter;
    }

    @Autowired
    public void configureGlobal(AuthenticationManagerBuilder auth) throws Exception {
        auth.authenticationProvider(authProvider());
    }

    public AuthenticationProvider authProvider() {
        DaoAuthenticationProvider provider = new DaoAuthenticationProvider();
        provider.setUserDetailsService(userDetailsService);
        provider.setPasswordEncoder(passwordEncoder());
        return provider;
    }

    public SimpleUrlAuthenticationFailureHandler failureHandler() {
        return new SimpleUrlAuthenticationFailureHandler("/login?error=true");
    }

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