SpringSecurity+JWT 登录授权过滤器

每次请求都会”携带“ token（ token 在 request 的 header 里面）

拦截验证过程：

　　request -> header -> token -> username -> userDetails(getAuthentication()) -> authentication

　　SecurityContextHolder.getContext().setAuthentication(authentication)　　//建立安全上下文

代码

public class JwtAuthenticationTokenFilter extends OncePerRequestFilter {
    private static final Logger LOGGER = LoggerFactory.getLogger(JwtAuthenticationTokenFilter.class);
    @Autowired
    private UserDetailsService userDetailsService;
    @Autowired
    private JwtTokenUtil jwtTokenUtil;
    @Value("${jwt.tokenHeader}")
    private String tokenHeader;
    @Value("${jwt.tokenHead}")
    private String tokenHead;

    @Override
    protected void doFilterInternal(HttpServletRequest request,
                                    HttpServletResponse response,
                                    FilterChain chain) throws ServletException,IOException {
        //request 中获取去 header
        String authHeader = request.getHeader(this.tokenHeader);
        //对header做判断
        if (authHeader != null && authHeader.startsWith(this.tokenHeader)) {
            //取出header
            //此处注意token之前有一个7字符长度的“Bearer “，
            String authToken = authHeader.substring(this.tokenHeader.length());// The part after "Bearer "
            //token中获取username
            String username = jwtTokenUtil.getUserNameFromToken(authToken);
            LOGGER.info("checking username:{}", username);
            //判断username
            if (username != null && SecurityContextHolder.getContext().getAuthentication() == null) {
                //拿到userDetails
                UserDetails userDetails = this.userDetailsService.loadUserByUsername(username);
                //验证token
                if (jwtTokenUtil.validateToken(authToken,userDetails)) {
                    //完整填充的 authentication（其中包含了权限集 getAuthorities()）
                    UsernamePasswordAuthenticationToken authentication = new UsernamePasswordAuthenticationToken(
                            userDetails, null, userDetails.getAuthorities());
                    authentication.setDetails(new WebAuthenticationDetailsSource().buildDetails(request));
                    LOGGER.info("authenticated user:{}", username);
                    //建立安全上下文
                    SecurityContextHolder.getContext().setAuthentication(authentication);
                }
            }
        }
        chain.doFilter(request, response);
    }
}

UserDetails

public interface UserDetails extends Serializable {
    //用户的权限集，
    Collection<? extends GrantedAuthority> getAuthorities();
    //用户的加密后的密码， 不加密会使用`{noop}`前缀
    String getPassword();
    //应用内唯一的用户名
    String getUsername();
    //账户是否过期
    boolean isAccountNonExpired();
    //账户是否锁定
    boolean isAccountNonLocked();
    //凭证是否过期
    boolean isCredentialsNonExpired();
    //用户是否可用
    boolean isEnabled();
}