【第二篇】SpringSecurity的第一次美好约会

public interface SecurityContext extends Serializable {

	Authentication getAuthentication();

	void setAuthentication(Authentication authentication);

}

public interface Authentication extends Principal, Serializable {

	// 获取认证用户拥有的对应的权限
	Collection<? extends GrantedAuthority> getAuthorities();

	// 获取哦凭证
	Object getCredentials();

    // 存储有关身份验证请求的其他详细信息。这些可能是 IP地址、证书编号等
	Object getDetails();

     // 获取用户信息 通常是 UserDetails 对象
	Object getPrincipal();

    // 是否认证
	boolean isAuthenticated();

    // 设置认证状态
	void setAuthenticated(boolean isAuthenticated) throws IllegalArgumentException;

}

    public String hello(){
        Authentication authentication = SecurityContextHolder.getContext().getAuthentication();
        Object principal = authentication.getPrincipal();
        if(principal instanceof UserDetails){
            UserDetails userDetails = (UserDetails) principal;
            System.out.println(userDetails.getUsername());
            return "当前登录的账号是：" + userDetails.getUsername();
        }
        return "当前登录的账号-->" + principal.toString();
    }

public interface UserDetails extends Serializable {

	// 对应的权限
	Collection<? extends GrantedAuthority> getAuthorities();

	// 密码
	String getPassword();

	// 账号
	String getUsername();

	// 账号是否过期
	boolean isAccountNonExpired();

	// 是否锁定
	boolean isAccountNonLocked();

	// 凭证是否过期
	boolean isCredentialsNonExpired();

	// 账号是否可用
	boolean isEnabled();

}

public interface UserDetailsService {

	UserDetails loadUserByUsername(String username) throws UsernameNotFoundException;

}

/**
 * 用户的Service
 */
public interface UserService extends UserDetailsService {

}

/**
 * UserService接口的实现类
 */
@Service
public class UserServiceImpl implements UserService {

    @Autowired
    UserMapper userMapper;

    /**
     * 根据账号密码验证的方法
     * @param username
     * @return
     * @throws UsernameNotFoundException
     */
    @Override
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
        SysUser user = userMapper.queryByUserName(username);
        System.out.println("---------->"+user);
        if(user != null){
            // 账号对应的权限
            List<SimpleGrantedAuthority> authorities = new ArrayList<>();
            authorities.add(new SimpleGrantedAuthority("ROLE_USER"));
            // 说明账号存在 {noop} 非加密的使用
            UserDetails details = new User(user.getUserName()
                    ,user.getPassword()
                    ,true
                    ,true
                    ,true
                    ,true
                    ,authorities);
            return details;
        }
        throw new UsernameNotFoundException("账号不存在...");

    }
}

public interface GrantedAuthority extends Serializable {


	String getAuthority();

}

Authentication authenticationResult = attemptAuthentication(request, response);

	@Override
	public Authentication attemptAuthentication(HttpServletRequest request, HttpServletResponse response)
			throws AuthenticationException {
		if (this.postOnly && !request.getMethod().equals("POST")) {
			throw new AuthenticationServiceException("Authentication method not supported: " + request.getMethod());
		}
		String username = obtainUsername(request);
		username = (username != null) ? username : "";
		username = username.trim();
		String password = obtainPassword(request);
		password = (password != null) ? password : "";
		UsernamePasswordAuthenticationToken authRequest = new UsernamePasswordAuthenticationToken(username, password);
		// Allow subclasses to set the "details" property
		setDetails(request, authRequest);
		return this.getAuthenticationManager().authenticate(authRequest);
	}

public interface AuthenticationManager {

	Authentication authenticate(Authentication authentication) throws AuthenticationException;

}

	@Override
	protected final UserDetails retrieveUser(String username, UsernamePasswordAuthenticationToken authentication)
			throws AuthenticationException {
		prepareTimingAttackProtection();
		try {
            // getUserDetailsService会获取到我们自定义的UserServiceImpl对象，也就是会走我们自定义的认证方法了
			UserDetails loadedUser = this.getUserDetailsService().loadUserByUsername(username);
			if (loadedUser == null) {
				throw new InternalAuthenticationServiceException(
						"UserDetailsService returned null, which is an interface contract violation");
			}
			return loadedUser;
		}
		catch (UsernameNotFoundException ex) {
			mitigateAgainstTimingAttack(authentication);
			throw ex;
		}
		catch (InternalAuthenticationServiceException ex) {
			throw ex;
		}
		catch (Exception ex) {
			throw new InternalAuthenticationServiceException(ex.getMessage(), ex);
		}
	}

additionalAuthenticationChecks(user, (UsernamePasswordAuthenticationToken) authentication);

	protected void additionalAuthenticationChecks(UserDetails userDetails,
			UsernamePasswordAuthenticationToken authentication) throws AuthenticationException {
        // 密码为空
		if (authentication.getCredentials() == null) {
			this.logger.debug("Failed to authenticate since no credentials provided");
			throw new BadCredentialsException(this.messages
					.getMessage("AbstractUserDetailsAuthenticationProvider.badCredentials", "Bad credentials"));
		}
        // 获取表单提交的密码
		String presentedPassword = authentication.getCredentials().toString();
		// 表单提交的密码和数据库查询的密码 比较是否相对
		if (!this.passwordEncoder.matches(presentedPassword, userDetails.getPassword())) {
			this.logger.debug("Failed to authenticate since password does not match stored value");
			throw new BadCredentialsException(this.messages
					.getMessage("AbstractUserDetailsAuthenticationProvider.badCredentials", "Bad credentials"));
		}
	}

    public boolean matches(CharSequence rawPassword, String encodedPassword) {
        return rawPassword.toString().equals(encodedPassword);
    }