Spring Boot 2结合Spring security + JWT实现微信小程序登录

项目源码：https://gitee.com/tanwubo/jwt-spring-security-demo

登录

通过自定义的WxAppletAuthenticationFilter替换默认的UsernamePasswordAuthenticationFilter，在UsernamePasswordAuthenticationFilter中可任意定制自己的登录方式。

用户认证

需要结合JWT来实现用户认证，第一步登录成功后如何颁发token。

public class CustomAuthenticationSuccessHandler implements AuthenticationSuccessHandler {

    @Autowired
    private JwtTokenUtils jwtTokenUtils;

    @Override
    public void onAuthenticationSuccess(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Authentication authentication) throws IOException, ServletException {
        // 使用jwt管理，所以封装用户信息生成jwt响应给前端
        String token = jwtTokenUtils.generateToken(((WxAppletAuthenticationToken)authentication).getOpenid());
        Map<String, Object> result = Maps.newHashMap();
        result.put(ConstantEnum.AUTHORIZATION.getValue(), token);
        httpServletResponse.setContentType(ContentType.JSON.toString());
        httpServletResponse.getWriter().write(JSON.toJSONString(result));
    }
}

第二步，弃用spring security默认的session机制，通过token来管理用户的登录状态。这里有俩段关键代码。

@Override
    protected void configure(HttpSecurity http) throws Exception {
        http.csrf()
                .disable()
                .sessionManagement()
                // 不创建Session, 使用jwt来管理用户的登录状态
                .sessionCreationPolicy(SessionCreationPolicy.STATELESS)
                ......;
    }

第二步，添加token的认证过滤器。

public class JwtAuthenticationTokenFilter extends OncePerRequestFilter {

    @Autowired
    private AuthService authService;

    @Autowired
    private JwtTokenUtils jwtTokenUtils;

    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException {
        log.debug("processing authentication for [{}]", request.getRequestURI());
        String token = request.getHeader(ConstantEnum.AUTHORIZATION.getValue());
        String openid = null;
        if (token != null) {
            try {
                openid = jwtTokenUtils.getUsernameFromToken(token);
            } catch (IllegalArgumentException e) {
                log.error("an error occurred during getting username from token", e);
                throw new BasicException(ExceptionEnum.JWT_EXCEPTION.customMessage("an error occurred during getting username from token , token is [%s]", token));
            } catch (ExpiredJwtException e) {
                log.warn("the token is expired and not valid anymore", e);
                throw new BasicException(ExceptionEnum.JWT_EXCEPTION.customMessage("the token is expired and not valid anymore, token is [%s]", token));
            }catch (SignatureException e) {
                log.warn("JWT signature does not match locally computed signature", e);
                throw new BasicException(ExceptionEnum.JWT_EXCEPTION.customMessage("JWT signature does not match locally computed signature, token is [%s]", token));
            }
        }else {
            log.warn("couldn't find token string");
        }
        if (openid != null && SecurityContextHolder.getContext().getAuthentication() == null) {
            log.debug("security context was null, so authorizing user");
            Account account = authService.findAccount(openid);
            List<Permission> permissions = authService.acquirePermission(account.getAccountId());
            List<SimpleGrantedAuthority> authorities = permissions.stream().map(permission -> new SimpleGrantedAuthority(permission.getPermission())).collect(Collectors.toList());
            log.info("authorized user [{}], setting security context", openid);
            SecurityContextHolder.getContext().setAuthentication(new WxAppletAuthenticationToken(openid, authorities));
        }
        filterChain.doFilter(request, response);
    }
}

接口鉴权

第一步，开启注解@EnableGlobalMethodSecurity。

@SpringBootApplication
@EnableGlobalMethodSecurity(prePostEnabled = true)
public class JwtSpringSecurityDemoApplication {

    public static void main(String[] args) {
        SpringApplication.run(JwtSpringSecurityDemoApplication.class, args);
    }

}

第二部，在需要鉴权的接口上添加@PreAuthorize注解。

@RestController
@RequestMapping("/test")
public class TestController {

    @GetMapping
    @PreAuthorize("hasAuthority('user:test')")
    public String test(){
        return "test success";
    }

    @GetMapping("/authority")
    @PreAuthorize("hasAuthority('admin:test')")
    public String authority(){
        return "test authority success";
    }

}