Spring Security（一）：整合JWT

违背的青春

今天写下 Spring Security 整合 jwt 的一个简单小 Demo ，目的是登录后实现返回 token ，其实整个过程很简单。

导入依赖

<dependency>
    <groupId>io.jsonwebtoken</groupId>
    <artifactId>jjwt</artifactId>
    <version>0.9.0</version>
</dependency>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-security</artifactId>
</dependency>
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首先创建一个JwtUser实现UserDetails

org.springframework.security.core.userdetails.UserDetails
先看一下这个接口的源码，其实很简单

public interface UserDetails extends Serializable {
    Collection<? extends GrantedAuthority> getAuthorities();

    String getPassword();

    String getUsername();

    boolean isAccountNonExpired();

    boolean isAccountNonLocked();

    boolean isCredentialsNonExpired();

    boolean isEnabled();
}
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这个是 Spring Security 给我们提供的一个简单的接口，因为我们需要通过 SecurityContextHolder 去取得用户凭证等等信息，因为这个比较简单，所以我们实际业务要来加上我们所需要的信息。

public class JwtUser implements UserDetails {


    private String username;

    private String password;

    private Integer state;

    private Collection<? extends GrantedAuthority> authorities;

    public JwtUser() {
    }

    public JwtUser(String username, String password, Integer state, Collection<? extends GrantedAuthority> authorities) {
        this.username = username;
        this.password = password;
        this.state = state;
        this.authorities = authorities;
    }

    @Override
    public String getUsername() {
        return username;
    }

    @JsonIgnore
    @Override
    public String getPassword() {
        return password;
    }

    @Override
    public Collection<? extends GrantedAuthority> getAuthorities() {
        return authorities;
    }

    //账户是否未过期
    @JsonIgnore
    @Override
    public boolean isAccountNonExpired() {
        return true;
    }

    //账户是否未被锁
    @Override
    public boolean isAccountNonLocked() {
        return true;
    }



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


    //是否启用
    @JsonIgnore
    @Override
    public boolean isEnabled() {
        return true;
    }
}
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我这个其实也很简单，只是一些用户名，密码状态和权限的集合这些。

编写一个 工具 类来生成令牌等…

@Data
@ConfigurationProperties(prefix = "jwt")
@Component
public class JwtTokenUtil implements Serializable {

    private String secret;

    private Long expiration;

    private String header;

    /**
     * 从数据声明生成令牌
     *
     * @param claims 数据声明
     * @return 令牌
     */
    private String generateToken(Map<String, Object> claims) {
        Date expirationDate = new Date(System.currentTimeMillis() + expiration);
        return Jwts.builder().setClaims(claims).setExpiration(expirationDate).signWith(SignatureAlgorithm.HS512, secret).compact();
    }

    /**
     * 从令牌中获取数据声明
     *
     * @param token 令牌
     * @return 数据声明
     */
    private Claims getClaimsFromToken(String token) {
        Claims claims;
        try {
            claims = Jwts.parser().setSigningKey(secret).parseClaimsJws(token).getBody();
        } catch (Exception e) {
            claims = null;
        }
        return claims;
    }

    /**
     * 生成令牌
     *
     * @param userDetails 用户
     * @return 令牌
     */
    public String generateToken(UserDetails userDetails) {
        Map<String, Object> claims = new HashMap<>(2);
        claims.put("sub", userDetails.getUsername());
        claims.put("created", new Date());
        return generateToken(claims);
    }

    /**
     * 从令牌中获取用户名
     *
     * @param token 令牌
     * @return 用户名
     */
    public String getUsernameFromToken(String token) {
        String username;
        try {
            Claims claims = getClaimsFromToken(token);
            username = claims.getSubject();
        } catch (Exception e) {
            username = null;
        }
        return username;
    }

    /**
     * 判断令牌是否过期
     *
     * @param token 令牌
     * @return 是否过期
     */
    public Boolean isTokenExpired(String token) {
        try {
            Claims claims = getClaimsFromToken(token);
            Date expiration = claims.getExpiration();
            return expiration.before(new Date());
        } catch (Exception e) {
            return false;
        }
    }

    /**
     * 刷新令牌
     *
     * @param token 原令牌
     * @return 新令牌
     */
    public String refreshToken(String token) {
        String refreshedToken;
        try {
            Claims claims = getClaimsFromToken(token);
            claims.put("created", new Date());
            refreshedToken = generateToken(claims);
        } catch (Exception e) {
            refreshedToken = null;
        }
        return refreshedToken;
    }

    /**
     * 验证令牌
     *
     * @param token       令牌
     * @param userDetails 用户
     * @return 是否有效
     */
    public Boolean validateToken(String token, UserDetails userDetails) {
        JwtUser user = (JwtUser) userDetails;
        String username = getUsernameFromToken(token);
        return (username.equals(user.getUsername()) && !isTokenExpired(token));
    }
}
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这个类就是一些生成令牌，验证等等一些操作。具体看注释~

编写一个Filter

@Slf4j
@Component
public class JwtAuthenticationTokenFilter extends OncePerRequestFilter {



    @Autowired
    private UserDetailsService userDetailsService;

    @Autowired
    private JwtTokenUtil jwtTokenUtil;


    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain chain) throws ServletException, IOException {
        String authHeader = request.getHeader(jwtTokenUtil.getHeader());
        if (authHeader != null && StringUtils.isNotEmpty(authHeader)) {
            String username = jwtTokenUtil.getUsernameFromToken(authHeader);
            log.info(username);
            if (username != null && SecurityContextHolder.getContext().getAuthentication() == null) {
                UserDetails userDetails = this.userDetailsService.loadUserByUsername(username);
                if (jwtTokenUtil.validateToken(authHeader, userDetails)) {
                    UsernamePasswordAuthenticationToken authentication = new UsernamePasswordAuthenticationToken(userDetails, null, userDetails.getAuthorities());
                    authentication.setDetails(new WebAuthenticationDetailsSource().buildDetails(request));
                    SecurityContextHolder.getContext().setAuthentication(authentication);
                }
            }
        }
        chain.doFilter(request, response);
    }
}
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这个其实就是用来验证令牌的是否合法，由于今天这个 Demo 是一个简单的登录返回 token 的过程，所以这个默认不会去执行里面的逻辑。但是以后登陆后的操作就会执行里面的逻辑了。

JwtUserDetailsServiceImpl

JwtUserDetailsServiceImpl 这个实现类是实现了 UserDetailsService ， UserDetailsService 是 Spring Security 进行身份验证的时候会使用，我们这里就一个加载用户信息的简单方法，就是得到当前登录用户的一些用户名、密码、用户所拥有的角色等等一些信息

@Slf4j
@Service
public class JwtUserDetailsServiceImpl implements UserDetailsService {



    @Autowired
    private UserMapper userMapper;
    @Override
    public UserDetails loadUserByUsername(String s) throws UsernameNotFoundException {

        User user = userMapper.selectByUserName(s);
        if(user == null){
            throw new UsernameNotFoundException(String.format("'%s'.这个用户不存在", s));
        }
        List<SimpleGrantedAuthority> collect = user.getRoles().stream().map(Role::getRolename).map(SimpleGrantedAuthority::new).collect(Collectors.toList());
        return new JwtUser(user.getUsername(), user.getPassword(), user.getState(), collect);
    }
}
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编写登录的业务实现类

@Slf4j
@Service
public class UserServiceImpl implements UserService {
    @Autowired
    private UserMapper userMapper;



    @Autowired
    private AuthenticationManager authenticationManager;

    @Autowired
    private UserDetailsService userDetailsService;

    @Autowired
    private JwtTokenUtil jwtTokenUtil;


    public User findByUsername(String username) {
        User user = userMapper.selectByUserName(username);
        log.info("userserviceimpl"+user);
        return user;
    }

    public RetResult login(String username, String password) throws AuthenticationException {
        UsernamePasswordAuthenticationToken upToken = new UsernamePasswordAuthenticationToken(username, password);
        final Authentication authentication = authenticationManager.authenticate(upToken);
        SecurityContextHolder.getContext().setAuthentication(authentication);
        UserDetails userDetails = userDetailsService.loadUserByUsername(username);
        return new RetResult(RetCode.SUCCESS.getCode(),jwtTokenUtil.generateToken(userDetails));
    }
}
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从上面可以看到 login 方法，会根据用户信息然后返回一个 token 给我们。

WebSecurityConfig

这个就是 Spring Security 的配置类了

@EnableWebSecurity
@EnableGlobalMethodSecurity(prePostEnabled = true)
public class WebSecurity extends WebSecurityConfigurerAdapter {

    @Autowired
    private UserDetailsService userDetailsService;

    @Autowired
    private JwtAuthenticationTokenFilter jwtAuthenticationTokenFilter;

    @Autowired
    public void configureAuthentication(AuthenticationManagerBuilder authenticationManagerBuilder)throws Exception{
        authenticationManagerBuilder.userDetailsService(this.userDetailsService).passwordEncoder(passwordEncoder());
    }


    @Bean(name = BeanIds.AUTHENTICATION_MANAGER)
    @Override
    public AuthenticationManager authenticationManagerBean() throws Exception {
        return super.authenticationManagerBean();
    }

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

    @Override
    protected void configure(HttpSecurity http) throws Exception {

        http.csrf().disable().sessionManagement().sessionCreationPolicy(SessionCreationPolicy.STATELESS)
                .and().authorizeRequests()
                .antMatchers(HttpMethod.OPTIONS, "/**").permitAll()
                .antMatchers("/auth/**").permitAll()
                .anyRequest().authenticated()
                .and().headers().cacheControl();

        http.addFilterBefore(jwtAuthenticationTokenFilter, UsernamePasswordAuthenticationFilter.class);


        ExpressionUrlAuthorizationConfigurer<HttpSecurity>.ExpressionInterceptUrlRegistry registry = http.authorizeRequests();
        //让Spring security放行所有preflight request
        registry.requestMatchers(CorsUtils::isPreFlightRequest).permitAll();
    }

    @Bean
    public CorsFilter corsFilter() {
        final UrlBasedCorsConfigurationSource urlBasedCorsConfigurationSource = new UrlBasedCorsConfigurationSource();
        final CorsConfiguration cors = new CorsConfiguration();
        cors.setAllowCredentials(true);
        cors.addAllowedOrigin("*");
        cors.addAllowedHeader("*");
        cors.addAllowedMethod("*");
        urlBasedCorsConfigurationSource.registerCorsConfiguration("/**", cors);
        return new CorsFilter(urlBasedCorsConfigurationSource);
    }
}
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我们可以在这里设置自定义的拦截规则，注意在 Spring Security5.x 中我们要显式注入 AuthenticationManager 不然会报错~

@Bean(name = BeanIds.AUTHENTICATION_MANAGER)
    @Override
    public AuthenticationManager authenticationManagerBean() throws Exception {
        return super.authenticationManagerBean();
    }
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目前基本的都已经完成了剩下的就是一些 entity,controller 的代码了具体可以看我 GitHub 上的代码。

如果有任何见解或者我有写错的地方可以联系我…我一定改…