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

implementation 'org.springframework.boot:spring-boot-starter-security'

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.EnableWebSecurity;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.security.crypto.password.PasswordEncoder;
import org.springframework.security.web.SecurityFilterChain;

@Configuration
@EnableWebSecurity
public class SecurityConfig {

    @Bean
    public SecurityFilterChain securityFilterChain(HttpSecurity http) throws Exception {
        http
            .csrf().disable()  // Отключение CSRF для упрощения
            .authorizeHttpRequests(auth -> auth
                .requestMatchers("/public/**").permitAll()  // Доступ к публичным ресурсам
                .requestMatchers("/admin/**").hasRole("ADMIN")  // Доступ только для ADMIN
                .anyRequest().authenticated()  // Остальные запросы требуют аутентификации
            )
            .formLogin(form -> form
                .loginPage("/login")  // Кастомная страница логина
                .permitAll()
            )
            .logout(logout -> logout
                .permitAll()
            );

        return http.build();
    }

    @Bean
    public PasswordEncoder passwordEncoder() {
        return new BCryptPasswordEncoder();  // Для кодирования паролей
    }

    // Пример встроенной аутентификации
    @Bean
    public void configure(AuthenticationManagerBuilder auth) throws Exception {
        auth
            .inMemoryAuthentication()
            .withUser("user")
            .password(passwordEncoder().encode("password"))
            .roles("USER")
            .and()
            .withUser("admin")
            .password(passwordEncoder().encode("admin"))
            .roles("ADMIN");
    }
}

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;
import org.springframework.stereotype.Service;

@Service
public class CustomUserDetailsService implements UserDetailsService {

    @Override
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
        // Заглушка для загрузки пользователя из базы данных
        if ("admin".equals(username)) {
            return User.builder()
                .username("admin")
                .password("$2a$10$7b4/uWVqOKu8.cQeMEjCE.Oz7w9f5qL4uLcyuKkKJ7TzPByHOfy92")  // Зашифрованный пароль "password"
                .roles("ADMIN")
                .build();
        } else {
            throw new UsernameNotFoundException("Пользователь не найден");
        }
    }
}

import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;
import io.jsonwebtoken.security.Keys;
import org.springframework.stereotype.Service;

import java.security.Key;
import java.util.Date;

@Service
public class JwtService {

    private final String secretKey = "mysecretkeymysecretkeymysecretkeymysecretkey"; // 256 бит

    public String generateToken(String username) {
        Key key = Keys.hmacShaKeyFor(secretKey.getBytes());
        return Jwts.builder()
                   .setSubject(username)
                   .setIssuedAt(new Date())
                   .setExpiration(new Date(System.currentTimeMillis() + 86400000))  // 1 день
                   .signWith(key, SignatureAlgorithm.HS256)
                   .compact();
    }
}

import io.jsonwebtoken.Claims;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.security.Keys;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.web.authentication.WebAuthenticationDetailsSource;
import org.springframework.stereotype.Component;
import org.springframework.web.filter.OncePerRequestFilter;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.security.Key;
import java.util.Collections;

@Component
public class JwtAuthenticationFilter extends OncePerRequestFilter {

    private final String secretKey = "mysecretkeymysecretkeymysecretkeymysecretkey";

    @Override
    protected void doFilterInternal(HttpServletRequest request, 
                                    HttpServletResponse response, 
                                    FilterChain filterChain) 
                                    throws ServletException, IOException {
        String authHeader = request.getHeader("Authorization");

        if (authHeader == null || !authHeader.startsWith("Bearer ")) {
            filterChain.doFilter(request, response);
            return;
        }

        String token = authHeader.substring(7);
        try {
            Key key = Keys.hmacShaKeyFor(secretKey.getBytes());
            Claims claims = Jwts.parserBuilder()
                                .setSigningKey(key)
                                .build()
                                .parseClaimsJws(token)
                                .getBody();

            String username = claims.getSubject();
            UsernamePasswordAuthenticationToken authentication =
                new UsernamePasswordAuthenticationToken(username, null, Collections.emptyList());
            SecurityContextHolder.getContext().setAuthentication(authentication);
        } catch (Exception e) {
            e.printStackTrace();
        }
          filterChain.doFilter(request, response);
    }
}

import org.springframework.security.access.prepost.PreAuthorize;
import org.springframework.stereotype.Service;

@Service
public class ReportService {

    @PreAuthorize("hasRole('ADMIN')")
    public void generateAdminReport() {
        System.out.println("Отчет для администратора");
    }

    @PreAuthorize("hasRole('USER')")
    public void generateUserReport() {
        System.out.println("Отчет для пользователя");
    }
}

import org.springframework.context.annotation.Configuration;
import org.springframework.security.config.annotation.method.configuration.EnableGlobalMethodSecurity;

@Configuration
@EnableGlobalMethodSecurity(prePostEnabled = true)
public class MethodSecurityConfig {
}