3. Configure Spring Security WebSecurityConfig

WebSecurityConfig

package net.javaguides.springboot.config;

import org.springframework.beans.factory.annotation.Autowired;
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.method.configuration.EnableGlobalMethodSecurity;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
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.SecurityFilterChain;
import org.springframework.security.web.util.matcher.AntPathRequestMatcher;

@Configuration
@EnableWebSecurity
@EnableGlobalMethodSecurity(securedEnabled = true, proxyTargetClass = true)
//@Order(101)
public class SecurityConfig {

    @Autowired
    private UserDetailsService userDetailsService;

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

    @Bean
    public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
        http
                .csrf().disable()
                .authorizeRequests()
                .antMatchers("/resources/**").permitAll()
                .antMatchers("/register/**").permitAll()
                .antMatchers("/admin/**").hasAnyRole("ADMIN", "GUEST")
                //.antMatchers("/admin/users/**").hasRole("ADMIN")
                .and()
                .formLogin()
                .loginPage("/login")
                .loginProcessingUrl("/login")
                .defaultSuccessUrl("/admin/posts")
                .failureUrl("/login?error")
                .permitAll()
                .and()
                .logout()
                .logoutRequestMatcher(new AntPathRequestMatcher("/logout"))
                .permitAll()
                .and()
                .exceptionHandling().accessDeniedPage("/403");
        return http.build();
    }

    @Autowired
    public void configureGlobal(AuthenticationManagerBuilder auth) throws Exception {
        auth
                .userDetailsService(userDetailsService)
                .passwordEncoder(passwordEncoder());
    }
}

Encrypt password for registered user

UserServiceImpl

Inject PasswordEncoder:

    private PasswordEncoder passwordEncoder;

    @Override
    public void saveUser(RegistrationDto registrationDto) {
        User user = new User();
        user.setName(registrationDto.getFirstName() + " " + registrationDto.getLastName());
        user.setEmail(registrationDto.getEmail());
        // use spring security to encrypt the password
        user.setPassword(passwordEncoder.encode(registrationDto.getPassword()));
        Role role = roleRepository.findByName("ROLE_GUEST");
        user.setRoles(Arrays.asList(role));
        userRepository.save(user);
    }

Complete code:

package net.javaguides.springboot.service.impl;

import net.javaguides.springboot.dto.RegistrationDto;
import net.javaguides.springboot.entity.Role;
import net.javaguides.springboot.entity.User;
import net.javaguides.springboot.repository.RoleRepository;
import net.javaguides.springboot.repository.UserRepository;
import net.javaguides.springboot.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.crypto.password.PasswordEncoder;
import org.springframework.stereotype.Service;

import java.util.Arrays;

@Service
public class UserServiceImpl implements UserService {

    private UserRepository userRepository;
    private RoleRepository roleRepository;

    @Autowired
    private PasswordEncoder passwordEncoder;

    public UserServiceImpl(UserRepository userRepository, RoleRepository roleRepository) {
        this.userRepository = userRepository;
        this.roleRepository = roleRepository;
    }

    @Override
    public void saveUser(RegistrationDto registrationDto) {
        User user = new User();
        user.setName(registrationDto.getFirstName() + " " + registrationDto.getLastName());
        user.setEmail(registrationDto.getEmail());
        // use spring security to encrypt the password
        user.setPassword(passwordEncoder.encode(registrationDto.getPassword()));
        Role role = roleRepository.findByName("ROLE_GUEST");
        user.setRoles(Arrays.asList(role));
        userRepository.save(user);
    }

    @Override
    public User findByEmail(String email) {
        return userRepository.findByEmail(email);
    }
}