मेमोरी-आधारित उपयोगकर्ता प्रमाणीकरण

import org.springframework.security.core.userdetails.User;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.security.crypto.password.PasswordEncoder;

public class UserBuilderDemo {
    public static void main(String[] args) {
        // A PasswordEncoder is essential for security
        PasswordEncoder passwordEncoder = new BCryptPasswordEncoder();

        UserDetails user = User.builder()
            .username("alice")
            .password(passwordEncoder.encode("secret")) // Encode the password!
            .roles("USER") // Short for ROLE_USER
            .build();

        System.out.println("Username: " + user.getUsername());
        System.out.println("Password (encoded): " + user.getPassword());
        System.out.println("Authorities: " + user.getAuthorities());
    }
}

import org.springframework.security.core.userdetails.User;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.provisioning.InMemoryUserDetailsManager;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.security.crypto.password.PasswordEncoder;

public class InMemoryManagerDemo {
    public static void main(String[] args) {
        PasswordEncoder passwordEncoder = new BCryptPasswordEncoder();

        UserDetails user1 = User.builder()
            .username("bob")
            .password(passwordEncoder.encode("pass123"))
            .roles("USER")
            .build();

        UserDetails admin = User.builder()
            .username("admin")
            .password(passwordEncoder.encode("adminpass"))
            .roles("ADMIN", "USER") // Multiple roles
            .build();

        // Create the manager with our users
        InMemoryUserDetailsManager manager = new InMemoryUserDetailsManager(user1, admin);

        // Try to load a user
        System.out.println("Loaded user: " + manager.loadUserByUsername("bob").getUsername());
        System.out.println("Loaded admin: " + manager.loadUserByUsername("admin").getUsername());
    }
}

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
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.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.security.crypto.password.PasswordEncoder;
import org.springframework.security.provisioning.InMemoryUserDetailsManager;

@Configuration
public class SimpleSecurityConfig {

    @Bean
    public UserDetailsService inMemoryUsers(PasswordEncoder passwordEncoder) {
        UserDetails user = User.builder()
            .username("tester")
            .password(passwordEncoder.encode("testpass"))
            .roles("VIEWER")
            .build();
        return new InMemoryUserDetailsManager(user);
    }

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

    // Other HttpSecurity configurations would go here...
}