package xyz.wbsite.config;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.access.AccessDeniedException;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.config.annotation.method.configuration.EnableGlobalMethodSecurity;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.builders.WebSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
import org.springframework.security.config.http.SessionCreationPolicy;
import org.springframework.security.core.Authentication;
import org.springframework.security.web.access.intercept.FilterSecurityInterceptor;
import xyz.wbsite.frame.auth.LocalData;
import xyz.wbsite.frame.auth.Token;
import xyz.wbsite.frame.utils.CookieUtil;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

@Configuration
@EnableGlobalMethodSecurity(securedEnabled = true)
public class SecurityConfig extends WebSecurityConfigurerAdapter {

    @Value("${web.url.auth.included}")
    private String[] included;
    @Value("${web.url.auth.excluded}")
    private String[] excluded;
    @Value("${spring.mvc.static-path-pattern}")
    private String[] staticPath;
    @Value("${web.login.page}")
    private String loginPage;

    @Override
    public void configure(WebSecurity web) throws Exception {
        web.ignoring().mvcMatchers(staticPath);
    }

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http.sessionManagement().sessionCreationPolicy(SessionCreationPolicy.STATELESS)
                .and()
                .addFilterBefore(new TokenFilter(), FilterSecurityInterceptor.class)// 过滤器用于处理Token
                .authorizeRequests()
                .antMatchers(excluded).permitAll()// 放行排除的URL
                .antMatchers(included).access("@Authorization.hasPermission(request,authentication)")// 需要权限的URL
                .and().cors()
                .and().headers().frameOptions().disable()
                .and().csrf().disable();
    }

    /**
     * 此方法不要删除 用于屏蔽默认用户密码生成
     * <p>
     * 例如 Using generated security password: f6b42a66-71b1-4c31-b6a8-942838c81408
     *
     * @return
     * @throws Exception
     */
    @Bean
    public AuthenticationManager authenticationManagerBean() throws Exception {
        return super.authenticationManagerBean();
    }

    public static class TokenFilter implements Filter {

        @Override
        public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
            HttpServletRequest request = (HttpServletRequest) servletRequest;
            HttpServletResponse response = (HttpServletResponse) servletResponse;
            String token = request.getParameter("token");
            if (token == null || token.isEmpty()) {
                token = CookieUtil.getCookieValue(request.getCookies(), "token");
            }

            // 组装Token ~ 这边根据实际的业务组装Token
            if (token != null) {
                LocalData.setToken( LocalData.getSysToken());
            } else {
                LocalData.setToken(null);
            }

            // Action
            String servletPath = request.getServletPath().toLowerCase();
            Pattern compile = Pattern.compile("^/(.+)\\.htm");
            Matcher matcher = compile.matcher(servletPath);
            if (matcher.find()) {
                LocalData.setAction(matcher.group(1));
            }

            try {
                filterChain.doFilter(servletRequest, servletResponse);
            } catch (AccessDeniedException e) {
                response.sendError(HttpServletResponse.SC_FORBIDDEN);
            } catch (Exception e) {
                response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
            }
        }
    }

    @Bean("Authorization")
    public Object getAuthorization() {
        return new Object() {
            public boolean hasPermission(HttpServletRequest request, Authentication authentication) {

                Token token_ = LocalData.getToken();
                if (token_ == null) {
                    return false;
                }

                String path = request.getServletPath();
                if (token_.hasRes(path)) {
                    return true;
                }

                return false;
            }
        };
    }

}
