/*
 * Copyright 2019-2029 geekidea(https://github.com/geekidea)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package io.geekidea.springbootplus.framework.shiro.jwt;

import io.geekidea.springbootplus.framework.common.api.ApiCode;
import io.geekidea.springbootplus.framework.common.api.ApiResult;
import io.geekidea.springbootplus.framework.shiro.service.ShiroLoginService;
import io.geekidea.springbootplus.framework.shiro.util.JwtTokenUtil;
import io.geekidea.springbootplus.framework.shiro.util.JwtUtil;
import io.geekidea.springbootplus.framework.util.HttpServletResponseUtil;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.apache.shiro.authc.AuthenticationException;
import org.apache.shiro.authc.AuthenticationToken;
import org.apache.shiro.subject.Subject;
import org.apache.shiro.web.filter.authc.AuthenticatingFilter;
import org.apache.shiro.web.util.WebUtils;

import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Shiro JWT授权过滤器
 *
 * @author geekidea
 * @date 2019-09-27
 * @since 1.3.0.RELEASE
 **/
@Slf4j
public class JwtFilter extends AuthenticatingFilter {

    private final ShiroLoginService shiroLoginService;

    public JwtFilter(ShiroLoginService shiroLoginService) {
        this.shiroLoginService = shiroLoginService;
    }

    /**
     * 将JWT Token包装成AuthenticationToken
     * 从http请求头中取得token,并从redis中取出token相关信息
     *
     * @param servletRequest
     * @param servletResponse
     * @return
     * @throws Exception
     */
    @Override
    protected AuthenticationToken createToken(ServletRequest servletRequest, ServletResponse servletResponse) {
        // 从http请求头中取得token
        String token = JwtTokenUtil.getToken();
        if (StringUtils.isBlank(token)) {
            throw new AuthenticationException("token不能为空");
        }
        if (JwtUtil.isExpired(token)) {
            throw new AuthenticationException("JWT Token已过期,token:" + token);
        }

        // 从redis 获取jwt数据
        JwtToken jwtToken = shiroLoginService.getTJwtTokenForRedis(token);
        if (jwtToken == null) {
            throw new AuthenticationException("Redis Token不存在,token:" + token);
        }
        return JwtToken.build(token, jwtToken.getSalt(), jwtToken.getExpireSecond(), jwtToken.getClientId(), jwtToken.getAppKey());
    }


    /**
     * 访问失败处理
     *
     * @param request
     * @param response
     * @return
     * @throws Exception
     */
    @Override
    protected boolean onAccessDenied(ServletRequest request, ServletResponse response) throws Exception {
        HttpServletRequest httpServletRequest = WebUtils.toHttp(request);
        HttpServletResponse httpServletResponse = WebUtils.toHttp(response);
        // 返回401
        httpServletResponse.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
        // 设置响应码为401或者直接输出消息
        String url = httpServletRequest.getRequestURI();
        log.error("onAccessDenied url：{}", url);
        ApiResult<Boolean> apiResult = ApiResult.fail(ApiCode.UNAUTHORIZED);
        HttpServletResponseUtil.printJson(httpServletResponse, apiResult);
        return false;
    }

    /**
     * 执行登陆认证
     * 判断是否允许访问
     *
     * @param request
     * @param response
     * @param mappedValue
     * @return
     */
    @Override
    protected boolean isAccessAllowed(ServletRequest request, ServletResponse response, Object mappedValue) {
        String url = WebUtils.toHttp(request).getRequestURI();
        log.info("isAccessAllowed url:{}", url);
        if (this.isLoginRequest(request, response)) {
            return true;
        }
        boolean allowed = false;
        try {
            allowed = executeLogin(request, response);
        } catch (IllegalStateException e) { //not found any token
            log.error("Token不能为空", e);
        } catch (Exception e) {
            log.error("访问错误", e);
        }
        return allowed || super.isPermissive(mappedValue);
    }

    /**
     * 登录成功处理
     *
     * @param token
     * @param subject
     * @param request
     * @param response
     * @return
     * @throws Exception
     */
    @Override
    protected boolean onLoginSuccess(AuthenticationToken token, Subject subject, ServletRequest request, ServletResponse response) throws Exception {
        String url = WebUtils.toHttp(request).getRequestURI();
        log.info("鉴权成功,token:{},url:{}", token, url);
        // 刷新token
        JwtToken jwtToken = (JwtToken) token;
        HttpServletResponse httpServletResponse = WebUtils.toHttp(response);
//        shiroLoginService.refreshToken(jwtToken, httpServletResponse);
        return true;
    }

    /**
     * 登录失败处理
     *
     * @param token
     * @param e
     * @param request
     * @param response
     * @return
     */
    @Override
    protected boolean onLoginFailure(AuthenticationToken token, AuthenticationException e, ServletRequest request, ServletResponse response) {
        log.error("登录失败，token:" + token + ",error:" + e.getMessage(), e);
        return false;
    }
}
