package com.skua.config;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.cors.CorsConfiguration;
import org.springframework.web.cors.UrlBasedCorsConfigurationSource;
import org.springframework.web.filter.CorsFilter;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

/**
 * Spring Boot 2.0 解决跨域问题
 */
@Configuration
public class WebMvcConfiguration implements WebMvcConfigurer {

	@Value("${skua.path.upload}")
	private String upLoadPath;
	@Value("${skua.path.webapp}")
	private String webAppPath;
	@Value("${spring.resource.static-locations}")
	private String staticLocations;

	@Bean
	public CorsFilter corsFilter() {
		final UrlBasedCorsConfigurationSource urlBasedCorsConfigurationSource = new UrlBasedCorsConfigurationSource();
		final CorsConfiguration corsConfiguration = new CorsConfiguration();
		/* 是否允许请求带有验证信息 */
		corsConfiguration.setAllowCredentials(true);
		/* 允许访问的客户端域名 */
		corsConfiguration.addAllowedOrigin("*");
		/* 允许服务端访问的客户端请求头 */
		corsConfiguration.addAllowedHeader("*");
		/* 允许访问的方法名,GET POST等 */
		corsConfiguration.addAllowedMethod("*");
		urlBasedCorsConfigurationSource.registerCorsConfiguration("/**", corsConfiguration);
		return new CorsFilter(urlBasedCorsConfigurationSource);
	}

	/**
	 * 静态资源的配置 - 使得可以从磁盘中读取 Html、图片、视频、音频等
	 */
	@Override
	public void addResourceHandlers(ResourceHandlerRegistry registry) {
		registry.addResourceHandler("/**")
		.addResourceLocations("file:" + upLoadPath + "//", "file:" + webAppPath + "//")
		.addResourceLocations(staticLocations.split(","));
	}

	/**
	 * 访问根路径默认跳转 index.html页面 （简化部署方案： 可以把前端打包直接放到项目的 webapp，上面的配置）
	 */
	@Override
	public void addViewControllers(ViewControllerRegistry registry) {
		registry.addViewController("/").setViewName("index.html");
	}
}