package com.nms.swspkmas_standalone.filter;
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import cn.hutool.crypto.digest.MD5;
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import com.alibaba.fastjson.JSONObject;
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import com.nms.swspkmas_standalone.response.CommonResult;
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import com.nms.swspkmas_standalone.response.ResultCode;
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import com.nms.swspkmas_standalone.shiro.token.JwtToken;
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import com.nms.swspkmas_standalone.utils.JwtTokenUtil;
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import lombok.extern.slf4j.Slf4j;
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import org.apache.shiro.authc.AuthenticationException;
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import org.apache.shiro.authc.AuthenticationToken;
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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.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.HashMap;
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import java.util.Map;
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/**
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* @Author ling.quan
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* @Date 2022/2/17 15:27
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* @Desciption
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*/
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@Slf4j
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public class JwtFilter extends BasicHttpAuthenticationFilter {
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// 存放token的map key为登录时的token加密，value为验证token
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public final static Map<String, String> tokenMap = new HashMap<>();
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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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//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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* 后置拦截处理
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* @param request
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* @param response
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* @throws Exception
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*/
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@Override
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protected void postHandle(ServletRequest request, ServletResponse response) throws Exception {
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//添加跨域支持
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this.fillCorsHeader(WebUtils.toHttp(request), WebUtils.toHttp(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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// 原用来判断是否是登录请求，在本例中不会拦截登录请求，用来检测Header是否包含token字段
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if(this.isLoginRequest(request,response)){//看看源码，调用了isLoginAttempt()方法
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return false; //返回false后进入onAccessDenied()方法，返回错误信息
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}
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boolean allowed = false;
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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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allowed = this.executeLogin(request,response);
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} catch (Exception e){ //未找到token
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log.error(e.getMessage());
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}
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return allowed || super.isPermissive(mappedValue);
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}
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/**
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* 检测Header中是否包含token字段
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* @param request
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* @param response
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* @return
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*/
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@Override
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protected boolean isLoginAttempt(ServletRequest request, ServletResponse response) {
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return ((HttpServletRequest) request).getHeader(JwtTokenUtil.USER_LOGIN_TOKEN) == null;
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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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//从请求头里拿到token
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AuthenticationToken token = createToken(request,response);
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if(token == null){
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String msg = "createToken method implementation returned null. A valid non-null AuthenticationToken must be created in order to execute a login attempt.";
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throw new IllegalStateException(msg);
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}
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try{
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Subject subject = getSubject(request,response);
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subject.login(token); //让shiro进行登录验证
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//没出错则验证成功
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return onLoginSuccess(token,subject,request,response);
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} catch (AuthenticationException e){
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return onLoginFailure(token, e, request, response);
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}
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}
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/**
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* 从Header中提取 JWT token
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* @param request
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* @param response
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* @return
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*/
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@Override
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protected AuthenticationToken createToken(ServletRequest request, ServletResponse response) {
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HttpServletRequest httpServletRequest = (HttpServletRequest) request;
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String authorization = httpServletRequest.getHeader(JwtTokenUtil.USER_LOGIN_TOKEN);
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return new JwtToken(authorization);
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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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fillCorsHeader(WebUtils.toHttp(request),httpServletResponse);
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return false;
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}
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/**
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* shiro利用 JWT Token 登录成功后，进入该方法
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* @param token
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* @param subject
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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 onLoginSuccess(AuthenticationToken token, Subject subject, ServletRequest request, ServletResponse response) throws Exception {
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HttpServletResponse httpResponse = WebUtils.toHttp(response);
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String newToken = null;
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//登录成功后判断是否需要续签token
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if(token instanceof JwtToken) {
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JwtToken jwtToken = (JwtToken) token;
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// boolean needUpdate = JWTUtils.isNeedUpdate(JwtFilter.tokenMap.get(MD5.create().digestHex(jwtToken.getCredentials().toString())), JwtTokenUtil.expiration);
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// if (needUpdate) {
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// newToken = JWTUtils.createToken(jwtToken.getPrincipal().toString(), JWTUtils.expireTime);
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// JwtFilter.tokenMap.put(MD5.create().digestHex(jwtToken.getCredentials().toString()), newToken);
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// }
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}
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// if(newToken != null){
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// httpResponse.setHeader(JWTUtils.USER_LOGIN_TOKEN,newToken);
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// }
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return true;
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}
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/**
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* 利用 JWT token 登录失败，会进入该方法
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* @param token
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* @param e
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* @param request
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* @param response
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* @return
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*/
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@Override
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protected boolean onLoginFailure(AuthenticationToken token, AuthenticationException e, ServletRequest request, ServletResponse response) {
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return false;//直接返回false,交给后面的 onAccessDenied()方法处理
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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("Access-control-Allow-Origin", request.getHeader("Origin"));
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response.setHeader("Access-Control-Allow-Methods", "GET,POST,OPTIONS,HEAD");
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response.setHeader("Access-Control-Allow-Headers",
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request.getHeader("Access-Control-Request-Headers"));
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}
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}
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