package com.ycwl.basic.config;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.module.SimpleModule;
import com.ycwl.basic.interceptor.AuthInterceptor;
import com.ycwl.basic.xss.XssJacksonDeserializer;
import com.ycwl.basic.xss.XssJacksonSerializer;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.StringHttpMessageConverter;
import org.springframework.http.converter.json.Jackson2ObjectMapperBuilder;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
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.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

import java.util.List;

/**
 * @date 2022年10月14日 11:20
 */
@Configuration
public class WebMvcConfig implements WebMvcConfigurer {

    @Autowired
    private AuthInterceptor authInterceptor;

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(authInterceptor)
                // 拦截除指定接口外的所有请求，通过判断 注解 来决定是否需要做登录验证
                .addPathPatterns("/**")
                .excludePathPatterns("/swagger-resources/**", "/webjars/**", "/v2/api-docs", "/doc.html/**", "/error", "/csrf", "/");
    }

    /**
     * 配置静态资源
     */
    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/static/**").addResourceLocations("classpath:/static/");
        registry.addResourceHandler("/templates/**").addResourceLocations("classpath:/templates/");
        /*放行swagger*/
        registry.addResourceHandler("doc.html").addResourceLocations("classpath:/META-INF/resources/");
        registry.addResourceHandler("/webjars/**").addResourceLocations("classpath:/META-INF/resources/webjars/");
    }

    /**
     * attention:简单跨域就是GET，HEAD和POST请求，但是POST请求的"Content-Type"只能是application/x-www-form-urlencoded, multipart/form-data 或 text/plain
     * 反之，就是非简单跨域，此跨域有一个预检机制，说直白点，就是会发两次请求，一次OPTIONS请求，一次真正的请求
     */
    @Bean
    public CorsFilter corsFilter() {
        final UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        final CorsConfiguration config = new CorsConfiguration();
        config.setAllowCredentials(true);
        // 允许向该服务器提交请求的URI，*表示全部允许，在SpringMVC中，如果设成*，会自动转成当前请求头中的Origin
        config.addAllowedOrigin("*");
        // 允许访问的头信息,*表示全部
        config.addAllowedHeader("*");
        // 预检请求的缓存时间（秒），即在这个时间段里，对于相同的跨域请求不会再预检了
        config.setMaxAge(18000L);
        // 允许提交请求的方法，*表示全部允许
        config.addAllowedMethod("OPTIONS");
        config.addAllowedMethod("HEAD");
        config.addAllowedMethod("GET");
        config.addAllowedMethod("PUT");
        config.addAllowedMethod("POST");
        config.addAllowedMethod("DELETE");
        config.addAllowedMethod("PATCH");
        source.registerCorsConfiguration("/**", config);
        return new CorsFilter(source);
    }


    @Bean
    public WebMvcConfigurer createConvert() {
        return new WebMvcConfigurer() {
            @Override
            public void extendMessageConverters(List<HttpMessageConverter<?>> converters) {
                Jackson2ObjectMapperBuilder builder = new Jackson2ObjectMapperBuilder();
                ObjectMapper mapper = builder.build();
                /*注入自定义的序列化工具，将RequestBody的参数进行转译后传输*/
                SimpleModule simpleModule = new SimpleModule();
                // XSS序列化
                simpleModule.addSerializer(String.class, new XssJacksonSerializer());
                simpleModule.addDeserializer(String.class, new XssJacksonDeserializer());
                mapper.registerModule(simpleModule);
                converters.add(new MappingJackson2HttpMessageConverter(mapper));
            }
        };
    }


    @Autowired
    private StringHttpMessageConverter stringHttpMessageConverter;
    @Autowired
    private MappingJackson2HttpMessageConverter httpMessageConverter;
    /**
     * 添加转换器
     */
    @Override
    public void extendMessageConverters(List<HttpMessageConverter<?>> converters) {
        for (int i = 0; i < converters.size(); i++) {
            if (converters.get(i) instanceof StringHttpMessageConverter){
                converters.set(i, stringHttpMessageConverter);
            }
            if (converters.get(i) instanceof MappingJackson2HttpMessageConverter) {
                converters.set(i, httpMessageConverter);
            }
        }
    }
}