前后端分离项目通过header参数鉴权

• 前端，在请求头加上鉴权参数

const apiKey = '******'
const echo = '随机字符串';
const timestamp = new Date().getTime();
headers: {
   'Content-Type': 'application/json;charset=utf-8',
    'Cache-Control': 'no-cache;max-age=0',
    'Pragma': 'no-cache',
    'x-echo-key': echo,
    'x-timestamp-key': timestamp,
    'x-signature-key': 加密函数(apiKey + timestamp + echo),
    'access-token': '校验登录的token',
    'user-id': '用户ID'
}

• 后端，拦截器配置类（AuthInterceptorConfig.java）

@Configuration
public class AuthInterceptorConfig implements WebMvcConfigurer {

    @Bean
    public AuthInterceptor initAuthInterceptor(){
        return new AuthInterceptor();
    }

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(initAuthInterceptor())
                .addPathPatterns("/col/**") //需要拦截的URL
                .excludePathPatterns("/login/**");　//不需要拦截的URL
    }
}

• 后端，拦截器处理类（AuthInterceptor.java）

public class AuthInterceptor implements HandlerInterceptor {
    private final static Logger logger = LoggerFactory.getLogger(AuthInterceptor.class);
    @Value("${app.x-api-key}")
    private String x_api_key;
    @Autowired
    private RedisService redisService;

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        response.setCharacterEncoding("UTF-8");
        response.setContentType("text/html;charset=utf-8");

        String servletPath = request.getServletPath();
        String xEchoKey = request.getHeader("x-echo-key");
        String xTimestampKey = request.getHeader("x-timestamp-key");
        String xSignatureKey = request.getHeader("x-signature-key");
        String accessToken = request.getHeader("access-token");
        String userId = request.getHeader("user-id");

        //处理特殊请求URL
        if (servletPath.contains("/**")) {
            String queryString = request.getQueryString();
            Map urlParams = StringUtil.queryStrToMap(queryString);
            xEchoKey = urlParams.get("x-echo-key");
            xTimestampKey = urlParams.get("x-timestamp-key");
            xSignatureKey = urlParams.get("x-signature-key");
            accessToken = urlParams.get("access-token");
            userId = urlParams.get("user-id");
        }

        //1.接口参数非空验证
        if (org.apache.commons.lang3.StringUtils.isEmpty(xEchoKey) || org.apache.commons.lang3.StringUtils.isEmpty(xTimestampKey) || org.apache.commons.lang3.StringUtils.isEmpty(xSignatureKey)) {
            response.getWriter().println("非法请求，接口参数验证错误");
            return false;
        }

        //2.签名检查
        String signature = MD5.gtMD5Code(x_api_key + xTimestampKey + xEchoKey);
        if (!xSignatureKey.equals(signature)) {
            response.getWriter().println("非法请求，签名校验失败");
            return false;
        }

        //3.检查时间戳
        long timestampNow = System.currentTimeMillis();
        long timestamp = Long.parseLong(xTimestampKey);
        long minutesDiff = (timestampNow - timestamp) / (1000 * 60);
        //5分钟内有效（自行设置）
        if (Math.abs(minutesDiff) > 5) {
            response.getWriter().println("非法请求，接口时间戳校验失败");
            return false;
        }

		//token已经在login系统时存到redis中
        String authCode = redisService.getStr("token_".concat(userId));
        if (null == authCode) {
            response.getWriter().println("会话已过期，请重新打开应用");
            return false;
        } else  {
			if (!accessToken.equals(authCode)) {
				response.getWriter().println("会话已过期，请重新打开应用");
            	return false;
			}
		}

        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {

    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {

    }
}