springSecurity前后端分离集成jwt(4)

x33g5p2x  于2021-08-23 转载在 Spring  
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一 前言

大家好,我是知识追寻者,本篇内容是springSecurity第四篇;没有相关基础的同学请学习后再来看这篇内容;文末附源码地址;

二 pom

pom 文件引入的依赖 , security 的启动器支持security 功能;lombok 进行简化开发; fastjson 进行Json处理;

jjwt 进行jwt token 支持;lang3 字符串处理;

 <dependencies>
     <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-security</artifactId>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.16.18</version>
            <scope>provided</scope>
        </dependency>
        <!-- fastjson -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.62</version>
        </dependency>
        <dependency>
            <groupId>io.jsonwebtoken</groupId>
            <artifactId>jjwt</artifactId>
            <version>0.9.0</version>
        </dependency>
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>3.4</version>
        </dependency>
</dependencies>

三 认证流程

  • SecurityContextHolder,提供SecurityContext的访问权限。
  • SecurityContext,保存Authentication和可能的特定于请求的安全信息。
  • Authentication,以特定于Spring Security的方式代表校验。
  • GrantedAuthority,以反映授予主体的应用程序范围的权限。
  • UserDetails,提供从应用程序的DAO或其他安全数据源构建Authentication对象所需的信息。
  • UserDetailsService,在基于String的用户名(或证书ID等)中传递时创建UserDetails

上面的意思不难理解, 从数据源中获取 用户信息 组装到 UserDetails, 然后通过UserDetailsService,传递 UserDetails; SecurityContextHolder 存储 整个 用户上下文信息,通过SecurityContext 存储 Authentication, 这样就保证了 springSecurity 持有用户信息;

四 实体

SysUser 实现 UserDetails 用于储存用户信息, 主要是用户名,密码, 和权限;

/**
 * @Author lsc
 * <p> </p>
 */
@Data
public class SysUser implements UserDetails {

    // 用户名
    private String username;
    // 密码
    private String password;
    // 权限信息
    private Set<? extends GrantedAuthority> authorities;

    @Override
    public boolean isAccountNonExpired() {
        return true;
    }

    @Override
    public boolean isAccountNonLocked() {
        return true;
    }

    @Override
    public boolean isCredentialsNonExpired() {
        return true;
    }

    @Override
    public boolean isEnabled() {
        return true;
    }
}

五 token工具类

token 工具类主要用于生产 token, 解析token, 校验token;这边需要注意的是,将 权限 归并到了生成 toekn 的步骤,这样通过 token就可以获取 权限,在权限校验时通过token就可以获取权限信息;缺点就进行授权的之后的token应为未更新会造成权限未同步;

/**
 * @Author lsc
 * <p> </p>
 */
public class JwtUtil {

    private static final String CLAIMS_ROLE = "zszxzRoles";

    /**
     * 5天(毫秒)
     */
    private static final long EXPIRATION_TIME = 1000 * 60 * 60 * 5;
    /**
     * JWT密码
     */
    private static final String SECRET = "secret";


    /**
     * 签发JWT
     */
    public static String getToken(String username, String roles) {
        Map<String, Object> claims = new HashMap<>(8);
        // 主体
        claims.put( CLAIMS_ROLE, roles);
        return Jwts.builder()
                .setClaims(claims)
                .claim("username",username)
                .setExpiration( new Date( Instant.now().toEpochMilli() + EXPIRATION_TIME  ) )// 过期时间
                .signWith( SignatureAlgorithm.HS512, SECRET )// 加密
                .compact();
    }

    /**
     * 验证JWT
     */
    public static Boolean validateToken(String token) {
        return (!isTokenExpired( token ));
    }

    /**
     * 获取token是否过期
     */
    public static Boolean isTokenExpired(String token) {
        Date expiration = getExpireTime( token );
        return expiration.before( new Date() );
    }

    /**
     * 根据token获取username
     */
    public static String getUsernameByToken(String token) {
        String username = (String) parseToken( token ).get("username");
        return username;
    }

    public static Set<GrantedAuthority> getRolseByToken(String token) {
        String rolse = (String) parseToken( token ).get(CLAIMS_ROLE);
        String[] strArray = StringUtils.strip(rolse, "[]").split(", ");
        Set<GrantedAuthority> authoritiesSet = new HashSet();
        if (strArray.length>0){
            Arrays.stream(strArray).forEach(rols-> {
                GrantedAuthority authority = new SimpleGrantedAuthority(rols);
                authoritiesSet.add(authority);
            });
        }
        return authoritiesSet;
    }

    /**
     * 获取token的过期时间
     */
    public static Date getExpireTime(String token) {
        Date expiration = parseToken( token ).getExpiration();
        return expiration;
    }

    /**
     * 解析JWT
     */
    private static Claims parseToken(String token) {
        Claims claims = Jwts.parser()
                .setSigningKey( SECRET )
                .parseClaimsJws( token )
                .getBody();
        return claims;
    }

}

六 UserDetailsService

UserDetailsService 用户查询数据库的数据信息,进行用户数据封装到UserDetails, 在进行用户身份认证的时候会走这边; 这边采用官方提供的PasswordEncoder 进行加密; 其配置方式需要在WebSecurityConfig 中 配置;

/**
 * @Author lsc
 * <p> </p>
 */
@Component
@Slf4j
public class SysUserDetailsService implements UserDetailsService {

    @Autowired
    private PasswordEncoder passwordEncoder;

    // 登陆验证时,通过username获取用户的所有权限信息; 正式环境中就是查询用户数据授权
    @Override
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
        log.info("------用户{}身份认证-----",username);
        // 新建用户
        SysUser user = new SysUser();
        // 账号
        user.setUsername(username);
        // 密码
        user.setPassword(passwordEncoder.encode("123456"));
        // 设置权限
        Set authoritiesSet = new HashSet();
        // 注意角色权限需要加 ROLE_前缀,否则报403
        GrantedAuthority userPower = new SimpleGrantedAuthority("ROLE_USER");
        GrantedAuthority adminPower = new SimpleGrantedAuthority("ROLE_ADMIN");
        authoritiesSet.add(userPower);
        authoritiesSet.add(adminPower);
        user.setAuthorities(authoritiesSet);
        return user;
    }
}

七 JWTLoginFilter

JWTLoginFilter 继承 AbstractAuthenticationProcessingFilter 过滤器;理论上继承 UsernamePasswordAuthenticationFilter 也是 可行,毕竟 UsernamePasswordAuthenticationFilter 是 AbstractAuthenticationProcessingFilter 的实现类;

JWTLoginFilter 用于用户登陆认证,其实现如下 三个方法 ;

  • attemptAuthentication 用于 尝试认证,如果认证成功会走 successfulAuthentication 方法;如果认证失败会走 unsuccessfulAuthentication 方法;
  • successfulAuthentication 认证成功后我们需要生成一个token,返回以JSON的形式返回给前端;
  • unsuccessfulAuthentication 认证失败,我们通过异常信息判定,然后返回错误信息给前端;
/**
 * @Author lsc
 * <p> 登陆认证过滤器 </p>
 */
public class JWTLoginFilter extends AbstractAuthenticationProcessingFilter {


    public JWTLoginFilter(String defaultFilterProcessesUrl, AuthenticationManager authenticationManager) {
        super(new AntPathRequestMatcher(defaultFilterProcessesUrl));
        setAuthenticationManager(authenticationManager);
    }


    /**
     * @Author lsc
     * <p> 登陆认证</p>
     * @Param [request, response]
     * @Return
     */
    public Authentication attemptAuthentication(HttpServletRequest request, HttpServletResponse response) throws IOException {
        SysUser user = new ObjectMapper().readValue(request.getInputStream(), SysUser.class);
        UsernamePasswordAuthenticationToken authenticationToken = new UsernamePasswordAuthenticationToken(
                user.getUsername(),
                user.getPassword());
        return getAuthenticationManager().authenticate(authenticationToken);
    }

    /**
     * @Author lsc
     * <p> 登陆成功返回token</p>
     * @Param [request, res, chain, auth]
     * @Return
     */
        @Override
        protected void successfulAuthentication(HttpServletRequest request, HttpServletResponse response,FilterChain chain, Authentication auth){
            SysUser principal = (SysUser)auth.getPrincipal();
            String token = JwtUtil.getToken(principal.getUsername(),principal.getAuthorities().toString());
            try {
                //登录成功時,返回json格式进行提示
                response.setContentType("application/json;charset=utf-8");
                response.setStatus(HttpServletResponse.SC_OK);
                PrintWriter out = response.getWriter();
                ResultPage result = ResultPage.sucess(CodeMsg.SUCESS,token);
                out.write(new ObjectMapper().writeValueAsString(result));
                out.flush();
                out.close();
            } catch (Exception e1) {
                e1.printStackTrace();
            }
        }

    @Override
    protected void unsuccessfulAuthentication(HttpServletRequest request, HttpServletResponse response, AuthenticationException failed) throws IOException, ServletException {
        String result="";
        // 账号过期
        if (failed instanceof AccountExpiredException) {
            result="账号过期";
        }
        // 密码错误
        else if (failed instanceof BadCredentialsException) {
            result="密码错误";
        }
        // 密码过期
        else if (failed instanceof CredentialsExpiredException) {
            result="密码过期";
        }
        // 账号不可用
        else if (failed instanceof DisabledException) {
            result="账号不可用";
        }
        //账号锁定
        else if (failed instanceof LockedException) {
            result="账号锁定";
        }
        // 用户不存在
        else if (failed instanceof InternalAuthenticationServiceException) {
            result="用户不存在";
        }
        // 其他错误
        else{
            result="未知异常";
        }
        // 处理编码方式 防止中文乱码
        response.setContentType("text/json;charset=utf-8");
        // 将反馈塞到HttpServletResponse中返回给前台
        response.getWriter().write(JSON.toJSONString(result));
    }
}

八 WebSecurityConfig

WebSecurityConfig 是 springSecurity 的配置相关信息;在配置中,可以进行数据访问权限限制,授权异常处理,账号加密方式等配置;

/**
 * @Author lsc
 * <p> </p>
 */
@EnableWebSecurity// 开启springSecurity
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {


    @Autowired
    DenyHandler denyHandler;

    @Autowired
    OutSuccessHandler outSuccessHandler;

    @Autowired
    SysUserDetailsService userDetailsService;

    @Autowired
    ExpAuthenticationEntryPoint expAuthenticationEntryPoint;

    /* *
     * @Author lsc
     * <p> 授权</p>
     * @Param [http]
     */
    protected void configure(HttpSecurity http) throws Exception {
        http
                .authorizeRequests()// 授权
                .antMatchers("/api/download/**").anonymous()// 匿名用户权限
                .antMatchers("/api/**").hasRole("USER")//普通用户权限
                .antMatchers("/api/admin/**").hasRole("ADMIN")// 管理员权限
                .antMatchers("/login").permitAll()
                //其他的需要授权后访问
                .anyRequest().authenticated()
                .and()// 异常
                .exceptionHandling()
                .accessDeniedHandler(denyHandler)//授权异常处理
                .authenticationEntryPoint(expAuthenticationEntryPoint)// 认证异常处理
                .and()
                .logout()
                .logoutSuccessHandler(outSuccessHandler)
                .and()
                .addFilterBefore(new JWTLoginFilter("/login",authenticationManager()),UsernamePasswordAuthenticationFilter.class)
                .addFilterBefore(new JwtAuthenticationFilter(authenticationManager()),UsernamePasswordAuthenticationFilter.class)
                .sessionManagement()
                // 设置Session的创建策略为:Spring Security不创建HttpSession
                .sessionCreationPolicy(SessionCreationPolicy.STATELESS)
                .and()
                .csrf().disable();// 关闭 csrf 否则post


    }



    /* *
     * @Author lsc
     * <p>认证 设置加密方式 </p>
     * @Param [auth]
     */
    @Override
    protected void configure(AuthenticationManagerBuilder auth) throws Exception {
        auth.userDetailsService(userDetailsService)
        .passwordEncoder(passwordEncoder());
    }

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

    @Bean
    @Override
    public AuthenticationManager authenticationManager() throws Exception {
        return super.authenticationManager();
    }

}

九 Handler

配置中使用到了3个处理类,分别是 denyHandler, outSuccessHandler, expAuthenticationEntryPoint;

其中 denyHandler 当权限进行校验时,如果权限不足就会走这个处理类

/**
 * @Author lsc
 * <p> 权限不足处理 </p>
 */
@Component
public class DenyHandler implements AccessDeniedHandler {

    @Override
    public void handle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, AccessDeniedException e) throws IOException, ServletException {
        // 设置响应头
        httpServletResponse.setContentType("application/json;charset=utf-8");
        // 返回值
        ResultPage result = ResultPage.error(CodeMsg.PERM_ERROR);
        httpServletResponse.getWriter().write(JSON.toJSONString(result));
    }
}

outSuccessHandler 是退出登陆处理类,默认地址 localhost:8080/logout;

/**
 * @Author lsc
 * <p> </p>
 */
@Component
public class OutSuccessHandler implements LogoutSuccessHandler {
    @Override
    public void onLogoutSuccess(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Authentication authentication) throws IOException, ServletException {
        // 设置响应头
        httpServletResponse.setContentType("application/json;charset=utf-8");
        // 返回值
        ResultPage result = ResultPage.sucess(CodeMsg.SUCESS,"退出登陆成功");
        httpServletResponse.getWriter().write(JSON.toJSONString(result));
    }
}

expAuthenticationEntryPoint 负责身份认证通过后异常处理,每个主要身份验证系统都有自己的AuthenticationEntryPoint实现;

/**
 * @Author lsc
 * <p> </p>
 */
@Component
public class ExpAuthenticationEntryPoint implements AuthenticationEntryPoint {
    @Override
    public void commence(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, AuthenticationException e) throws IOException, ServletException {
        // 设置响应头
        httpServletResponse.setContentType("application/json;charset=utf-8");
        // 返回值
        ResultPage result = ResultPage.error(CodeMsg.ACCOUNT_ERROR);
        httpServletResponse.getWriter().write(JSON.toJSONString(result));
    }
}

十 Controller

SysUserController 用于 提供权限测试

/**
 * @Author lsc
 * <p> </p>
 */
@RestController
public class SysUserController {


    @GetMapping("api/admin")
    @PreAuthorize("hasAuthority('ADMIN')")
    public String authAdmin() {
        return "需要ADMIN权限";
    }

    @GetMapping("api/test")
    @PreAuthorize("hasAuthority('USER')")
    public String authUser() {
        return "需要USER权限";
    }
}

整体项目结构如下

十一 测试

用户登陆 ,返回token

请求接口测试,返回数据

用户退出返回信息;

最后

参考文档

https://blog.csdn.net/Piconjo/article/details/106156383

https://www.jianshu.com/p/8bd4a6e27e7f

https://www.jianshu.com/p/bd882078fac4

https://docs.spring.io/spring-security/site/docs/5.3.3.BUILD-SNAPSHOT/reference/html5/

源码地址:公众号后台回复: springsecurity

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