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基于Spring-Security自定义登陆错误提示信息

2024-04-02 19:04:59 463人浏览 八月长安

Python 官方文档:入门教程 => 点击学习

摘要

目录一. 自定义实现二. 实现自定义登陆页面spring-Security登陆表单提交过程那么异常一下是如何传递给前端的呢获取方式实现效果如图所示: 首先公布实现代码: 一. 自定

实现效果如图所示:

首先公布实现代码:

一. 自定义实现

import.org.springframework.security.core.userdetails.UserDetailsService类

并且抛出BadCredentialsException异常,否则页面无法获取到错误信息。


 
@Slf4j
@Service
public class MyUserDetailsServiceImpl implements UserDetailsService { 
    @Autowired
    private PassWordEncoder passwordEncoder; 
    @Autowired
    private UserService userService; 
    @Autowired
    private PermissionService permissionService; 
    private String passwordParameter = "password"; 
    @Override
    public UserDetails loadUserByUsername(String username) throws AuthenticationException {
        httpservletRequest request = ContextHolderUtils.getRequest();
        String password = request.getParameter(passwordParameter);
        log.error("password = {}", password);
 
        SysUser sysUser = userService.getByUsername(username);
        if (null == sysUser) {
            log.error("用户{}不存在", username);
            throw new BadCredentialsException("帐号不存在,请重新输入");
        }
        // 自定义业务逻辑校验
        if ("userli".equals(sysUser.getUsername())) {
            throw new BadCredentialsException("您的帐号有违规记录,无法登录!");
        }
        // 自定义密码验证
        if (!password.equals(sysUser.getPassword())){
            throw new BadCredentialsException("密码错误,请重新输入");
        }
        List<SysPermission> permissionList = permissionService.findByUserId(sysUser.getId());
        List<SimpleGrantedAuthority> authorityList = new ArrayList<>();
        if (!CollectionUtils.isEmpty(permissionList)) {
            for (SysPermission sysPermission : permissionList) {
                authorityList.add(new SimpleGrantedAuthority(sysPermission.getCode()));
            }
        }
 
        User myUser = new User(sysUser.getUsername(), passwordEncoder.encode(sysUser.getPassword()), authorityList); 
        log.info("登录成功!用户: {}", myUser); 
        return myUser;
    }
}

二. 实现自定义登陆页面

前提是,你们已经解决了自定义登陆页面配置的问题,这里不做讨论。

通过 thymeleaf 表达式获取错误信息(我们选择thymeleaf模板引擎)


<p style="color: red" th:if="${param.error}"   th:text="${session.SPRING_SECURITY_LAST_EXCEPTION.message}"></p>

<!DOCTYPE html>
<html xmlns:th="Http://www.thymeleaf.org">
<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <title>XX相亲网</title>
    <meta name="description" content="Ela Admin - HTML5 Admin Template">
    <meta name="viewport" content="width=device-width, initial-scale=1">
</head>
<body class="mui-content">
<div id="d1">
    <div class="first">
        <img class="hosp" th:src="@{/images/dashboard/hospital.png}"/>
        <div class="hospital">XX相亲网</div>
    </div>
    <div class="sufee-login d-flex align-content-center flex-wrap">
        <div class="container">
            <div class="login-content">
                <div class="login-loGo">
                    <h1 style="color: #385978;font-size: 24px">XX相亲网</h1>
                    <h1 style="color: #385978;font-size: 24px">登录</h1>
                </div>
                <div class="login-fORM">
                    <form th:action="@{/login}" method="post">
                        <div class="form-group">
                            <input type="text" class="form-control" name="username" placeholder="请输入帐号">
                        </div>
                        <div class="form-group">
                            <input type="password" class="form-control" name="password" placeholder="请输入密码">
                        </div>
                        <div>
                            <button type="submit" class="button-style">
                                <span class="in">登录</span>
                            </button>
                        </div>
                        <p style="color: red" th:if="${param.error}"             
                           th:text="${session.SPRING_SECURITY_LAST_EXCEPTION.message}">
                        </p>
                    </form>
                </div>
            </div>
        </div>
    </div>
</div>
</body>
</html>

Spring-Security登陆表单提交过程

当用户从登录页提交账号密码的时候,首先由

org.springframework.security.WEB.authentication包下的UsernamePasswordAuthenticationFilter类attemptAuthentication()

方法来处理登陆逻辑。


 
	public Authentication attemptAuthentication(HttpServletRequest request,
			HttpServletResponse response) throws AuthenticationException {
		if (postOnly && !request.getMethod().equals("POST")) {
			throw new AuthenticationServiceException(
					"Authentication method not supported: " + request.getMethod());
		} 

		String username = obtainUsername(request);
		String password = obtainPassword(request); 
		if (username == null) {
			username = "";
		}
 
		if (password == null) {
			password = "";
		}
 
		username = username.trim(); 
		UsernamePasswordAuthenticationToken authRequest = new UsernamePasswordAuthenticationToken(
				username, password); 
		// Allow subclasses to set the "details" property
		setDetails(request, authRequest); 
		return this.getAuthenticationManager().authenticate(authRequest);
	}

1. 该类内部默认的登录请求url是"/login",并且只允许POST方式的请求。

2. obtainUsername()方法参数名为"username"和"password"从HttpServletRequest中获取用户名和密码(由此可以找到突破口,我们可以在自定义实现的loadUserByUsername方法中获取到提交的账号和密码,进而检查正则性)。

3. 通过构造方法UsernamePasswordAuthenticationToken,将用户名和密码分别赋值给principal和credentials。


    public UsernamePasswordAuthenticationToken(Object principal, Object credentials) {
        super((Collection)null);
        this.principal = principal;
        this.credentials = credentials;
        this.setAuthenticated(false);
    }

super(null)调用的是父类的构造方法,传入的是权限集合,因为目前还没有认证通过,所以不知道有什么权限信息,这里设置为null,然后将用户名和密码分别赋值给principal和credentials,同样因为此时还未进行身份认证,所以setAuthenticated(false)。

到此为止,用户提交的表单信息已加载完成,继续往下则是校验表单提交的账号和密码是否正确。

那么异常一下是如何传递给前端的呢

前面提到用户登录验证的过滤器是UsernamePasswordAuthenticationFilter,它继承自AbstractAuthenticationProcessingFilter。


public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain)
			throws IOException, ServletException { 
		HttpServletRequest request = (HttpServletRequest) req;
		HttpServletResponse response = (HttpServletResponse) res;
 
		if (!requiresAuthentication(request, response)) {
			chain.doFilter(request, response); 
			return;
		}
 
		if (logger.isDebugEnabled()) {
			logger.debug("Request is to process authentication");
		}
 
		Authentication authResult; 
		try {
			authResult = attemptAuthentication(request, response);
			if (authResult == null) {
				// return immediately as subclass has indicated that it hasn't completed
				// authentication
				return;
			}
			sessionStrategy.onAuthentication(authResult, request, response);
		}
		catch (InternalAuthenticationServiceException failed) {
			logger.error(
					"An internal error occurred while trying to authenticate the user.",
					failed);
			unsuccessfulAuthentication(request, response, failed); 
			return;
		}
		catch (AuthenticationException failed) {
			// Authentication failed
			unsuccessfulAuthentication(request, response, failed); 
			return;
		}
 
		// Authentication success
		if (continueChainBeforeSuccessfulAuthentication) {
			chain.doFilter(request, response);
		} 
		successfulAuthentication(request, response, chain, authResult);
	}

从代码片段中看到Spring将异常捕获后交给了unsuccessfulAuthentication这个方法来处理。

unsuccessfulAuthentication又交给了failureHandler(AuthenticationFailureHandler)来处理,然后追踪failureHandler


	protected void unsuccessfulAuthentication(HttpServletRequest request,
			HttpServletResponse response, AuthenticationException failed)
			throws IOException, ServletException {
		SecurityContextHolder.clearContext();
 
		if (logger.isDebugEnabled()) {
			logger.debug("Authentication request failed: " + failed.toString(), failed);
			logger.debug("Updated SecurityContextHolder to contain null Authentication");
			logger.debug("Delegating to authentication failure handler " + failureHandler);
		}
 
		rememberMeServices.loginFail(request, response); 
		failureHandler.onAuthenticationFailure(request, response, failed);
	}

Ctrl + 左键 追踪failureHandler引用的类是,SimpleUrlAuthenticationFailureHandler。


	private AuthenticationSuccesshandler successHandler = new SavedRequestAwareAuthenticationSuccessHandler();
	private AuthenticationFailureHandler failureHandler = new SimpleUrlAuthenticationFailureHandler();

找到SimpleUrlAuthenticationFailureHandler类中的,onAuthenticationFailure()方法。


	public void onAuthenticationFailure(HttpServletRequest request,
			HttpServletResponse response, AuthenticationException exception)
			throws IOException, ServletException {
 
		if (defaultFailureUrl == null) {
			logger.debug("No failure URL set, sending 401 Unauthorized error");
 
			response.sendError(HttpServletResponse.SC_UNAUTHORIZED,
					"Authentication Failed: " + exception.getMessage());
		}
		else {
			saveException(request, exception);
 
			if (forwardToDestination) {
				logger.debug("Forwarding to " + defaultFailureUrl);
 
				request.getRequestDispatcher(defaultFailureUrl)
						.forward(request, response);
			}
			else {
				logger.debug("Redirecting to " + defaultFailureUrl);
				redirectStrategy.sendRedirect(request, response, defaultFailureUrl);
			}
		}
	}

追踪到saveException(request, exception)的内部实现。


	protected final void saveException(HttpServletRequest request,
			AuthenticationException exception) {
		if (forwardToDestination) {
			request.setAttribute(WebAttributes.AUTHENTICATION_EXCEPTION, exception);
		}
		else {
			HttpSession session = request.getSession(false);
 
			if (session != null || allowSessionCreation) {
				request.getSession().setAttribute(WebAttributes.AUTHENTICATION_EXCEPTION,
						exception);
			}
		}
	}

此处的


request.getSession().setAttribute(WebAttributes.AUTHENTICATION_EXCEPTION, exception); 

就是存储到session中的错误信息,key就是


public static final String AUTHENTICATION_EXCEPTION =
"SPRING_SECURITY_LAST_EXCEPTION";

因此我们通过thymeleaf模板引擎的表达式可获得session的信息。

获取方式


<p style="color: red" th:if="${param.error}" 
th:text="${session.SPRING_SECURITY_LAST_EXCEPTION.message}">
</p>

需要注意:saveException保存的是Session对象所以需要使用${SPRING_SECURITY_LAST_EXCEPTION.message}获取。

以上为个人经验,希望能给大家一个参考,也希望大家多多支持编程网。

--结束END--

本文标题: 基于Spring-Security自定义登陆错误提示信息

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