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/**
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 * 登录检查
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 * 1、配置好拦截器要拦截哪些请求
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 * 2、把这些配置放在容器中
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 */
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@Slf4j
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public class LoginInterceptor implements HandlerInterceptor {
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    /**
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     * 目标方法执行之前
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     * @param request
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     * @param response
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     * @param handler
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     * @return
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     * @throws Exception
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     */
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    @Override
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    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
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        String requestURI = request.getRequestURI();
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        log.info("preHandle拦截的请求路径是{}",requestURI);
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        //登录检查逻辑
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        HttpSession session = request.getSession();
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        Object loginUser = session.getAttribute("loginUser");
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        if(loginUser != null){
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            //放行
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            return true;
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        }
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        //拦截住。未登录。跳转到登录页
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        request.setAttribute("msg","请先登录");
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//        re.sendRedirect("/");
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        request.getRequestDispatcher("/").forward(request,response);
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        return false;
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    }
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    /**
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     * 目标方法执行完成以后
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     * @param request
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     * @param response
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     * @param handler
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     * @param modelAndView
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     * @throws Exception
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     */
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    @Override
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    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
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        log.info("postHandle执行{}",modelAndView);
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    }
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    /**
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     * 页面渲染以后
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     * @param request
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     * @param response
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     * @param handler
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     * @param ex
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     * @throws Exception
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     */
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    @Override
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    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
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        log.info("afterCompletion执行异常{}",ex);
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    }
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}

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/**
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 * 1、编写一个拦截器实现HandlerInterceptor接口
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 * 2、拦截器注册到容器中（实现WebMvcConfigurer的addInterceptors）
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 * 3、指定拦截规则【如果是拦截所有，静态资源也会被拦截】
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 */
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@Configuration
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public class AdminWebConfig implements WebMvcConfigurer {
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    @Override
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    public void addInterceptors(InterceptorRegistry registry) {
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        registry.addInterceptor(new LoginInterceptor())
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                .addPathPatterns("/**")  //所有请求都被拦截包括静态资源
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                .excludePathPatterns("/","/login","/css/**","/fonts/**","/images/**","/js/**"); //放行的请求
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    }
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}

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//MultipartFile 自动封装上传过来的文件【图片、视频、文件都可】
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@PostMapping("/upload")
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public String upload(@RequestParam("email") String email,
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                     @RequestParam("username") String username,
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                     @RequestPart("headerImg") MultipartFile headerImg,
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                     @RequestPart("photos") MultipartFile[] photos) throws IOException {
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    log.info("上传的信息：email={}，username={}，headerImg={}，photos={}",
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            email,username,headerImg.getSize(),photos.length);
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    //单文件
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    if(!headerImg.isEmpty()){
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        //保存到文件服务器，OSS服务器
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        String originalFilename = headerImg.getOriginalFilename();
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        //保存到磁盘
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        headerImg.transferTo(new File("D:\\linshi\\temp\\"+originalFilename));
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    }
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    //多文件
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    if(photos.length > 0){
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        for (MultipartFile photo : photos) {
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            if(!photo.isEmpty()){
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                String originalFilename = photo.getOriginalFilename();
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                photo.transferTo(new File("D:\\linshi\\temp\\"+originalFilename));
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            }
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        }
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    }
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    return "main";
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}