package com.gkhy.assess.framework.shiro.filter;
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import com.alibaba.fastjson.JSONObject;
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import com.gkhy.assess.common.api.CommonResult;
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import com.gkhy.assess.common.api.ResultCode;
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import com.gkhy.assess.common.exception.ApiException;
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import com.gkhy.assess.common.utils.JwtTokenUtil;
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import com.gkhy.assess.framework.shiro.JwtToken;
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import lombok.extern.slf4j.Slf4j;
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import org.apache.commons.lang3.StringUtils;
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import org.apache.shiro.subject.Subject;
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import org.apache.shiro.web.filter.authc.BasicHttpAuthenticationFilter;
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import org.apache.shiro.web.util.WebUtils;
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import org.springframework.http.HttpHeaders;
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import org.springframework.http.HttpStatus;
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import org.springframework.web.bind.annotation.RequestMethod;
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import javax.servlet.ServletRequest;
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import javax.servlet.ServletResponse;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import java.io.PrintWriter;
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import java.util.Date;
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@Slf4j
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public class JwtFilter extends BasicHttpAuthenticationFilter {
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/**
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* 默认开启跨域设置（使用单体）
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* 微服务情况下，此属性设置为false
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*/
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private boolean allowOrigin = true;
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public JwtFilter(){}
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public JwtFilter(boolean allowOrigin){
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this.allowOrigin=allowOrigin;
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}
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/**
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* 前置拦截处理
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* @param request
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* @param response
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* @return
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* @throws Exception
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*/
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@Override
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protected boolean preHandle(ServletRequest request, ServletResponse response) throws Exception {
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//servlet请求与响应的转换
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HttpServletRequest httpServletRequest = WebUtils.toHttp(request);
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HttpServletResponse httpServletResponse = WebUtils.toHttp(response);
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if(allowOrigin){
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this.fillCorsHeader(WebUtils.toHttp(request), WebUtils.toHttp(response));
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}
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//跨域时会首先发送一个option请求，这里我们给option请求直接返回正常状态
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if(httpServletRequest.getMethod().equals(RequestMethod.OPTIONS.name())){
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httpServletResponse.setStatus(HttpStatus.OK.value());
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return false;
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}
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return super.preHandle(request, response);
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}
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/**
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* 过滤器拦截请求的入口方法,所有请求都会进入该方法
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* 返回true则允许访问
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* @param request
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* @param response
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* @param mappedValue
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* @return
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*/
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@Override
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protected boolean isAccessAllowed(ServletRequest request, ServletResponse response, Object mappedValue) {
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try{
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//检测header里的JWT Token内容是否正确，尝试使用token进行登录
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this.executeLogin(request,response);
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return true;
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} catch (Exception e){ //未找到token
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log.error(e.getMessage());
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JwtTokenUtil.responseError(response,e.getMessage());
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}
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return false;
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}
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/**
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* 身份验证，检查JWT token是否合法
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* @param request
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* @param response
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* @return
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* @throws Exception
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*/
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@Override
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protected boolean executeLogin(ServletRequest request, ServletResponse response) throws Exception {
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HttpServletRequest httpServletRequest = (HttpServletRequest) request;
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String jwtToken = httpServletRequest.getHeader(JwtTokenUtil.USER_LOGIN_TOKEN);
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JwtToken token=new JwtToken(jwtToken);
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Subject subject = getSubject(request,response);
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subject.login(token);
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return true;
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}
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/**
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* isAccessAllowed()方法返回false,会进入该方法，表示拒绝访问
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* @param request
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* @param response
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* @return
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* @throws Exception
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*/
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@Override
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protected boolean onAccessDenied(ServletRequest request, ServletResponse response) throws Exception {
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HttpServletResponse httpServletResponse = WebUtils.toHttp(response);
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httpServletResponse.setCharacterEncoding("UTF-8");
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httpServletResponse.setContentType("application/json;charset=UTF-8");
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httpServletResponse.setStatus(HttpStatus.OK.value());
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PrintWriter writer = httpServletResponse.getWriter();
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writer.write(JSONObject.toJSONString(CommonResult.failed(ResultCode.UNAUTHORIZED)));
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return false;
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}
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//跨域请求的解决方案之一
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protected void fillCorsHeader(HttpServletRequest request, HttpServletResponse response){
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response.setHeader(HttpHeaders.ACCESS_CONTROL_ALLOW_ORIGIN, request.getHeader(HttpHeaders.ORIGIN));
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// 允许客户端请求方法
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response.setHeader(HttpHeaders.ACCESS_CONTROL_ALLOW_METHODS, "GET,POST,OPTIONS,HEAD,PUT,DELETE");
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// 允许客户端提交的Header
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String requestHeaders = request.getHeader(HttpHeaders.ACCESS_CONTROL_REQUEST_HEADERS);
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if (StringUtils.isNotEmpty(requestHeaders)) {
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response.setHeader(HttpHeaders.ACCESS_CONTROL_ALLOW_HEADERS, requestHeaders);
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}
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// 允许客户端携带凭证信息(是否允许发送Cookie)
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response.setHeader(HttpHeaders.ACCESS_CONTROL_ALLOW_CREDENTIALS, "true");
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}
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}
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