package com.example.springboot.security;
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import cn.hutool.core.util.StrUtil;
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import com.example.springboot.security.constant.SystemConstant;
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import com.example.springboot.security.entity.JwtToken;
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import lombok.extern.slf4j.Slf4j;
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import org.apache.shiro.SecurityUtils;
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import org.apache.shiro.web.filter.authc.BasicHttpAuthenticationFilter;
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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.Cookie;
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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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@Slf4j
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public class NoSessionFilter extends BasicHttpAuthenticationFilter {
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@Override
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protected boolean isAccessAllowed(ServletRequest request, ServletResponse response, Object mappedValue) {
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HttpServletRequest servletRequest = (HttpServletRequest) request;
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// 1.从Cookie获取token
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String token = getTokenFromCookie(servletRequest);
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if (StrUtil.isBlank(token)) {
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// 2.从headers中获取
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token = servletRequest.getHeader(SystemConstant.TOKEN_HEADER);
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}
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if (StrUtil.isBlank(token)) {
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// 3.从请求参数获取
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token = request.getParameter(SystemConstant.TOKEN_HEADER);
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}
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if (StrUtil.isBlank(token)) {
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return false;
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}
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// 验证token
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JwtToken jwtToken = new JwtToken(token);
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// 提交给realm进行登入，如果错误他会抛出异常并被捕获
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// todo https://www.cnblogs.com/red-star/p/12121941.html https://blog.csdn.net/qq_43721032/article/details/110188342
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try {
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SecurityUtils.getSubject().login(jwtToken);
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} catch (Exception e) {
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return false;
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}
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// 如果没有抛出异常则代表登入成功，返回true
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return true;
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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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PrintWriter printWriter = response.getWriter();
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response.setCharacterEncoding("utf-8");
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printWriter.write("403");
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printWriter.flush();
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printWriter.close();
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return false;
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}
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private String getTokenFromCookie(HttpServletRequest request) {
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String token = null;
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Cookie[] cookies = request.getCookies();
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int len = null == cookies ? 0 : cookies.length;
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if (len > 0) {
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for (Cookie cookie : cookies) {
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if (cookie.getName().equals(SystemConstant.TOKEN_HEADER)) {
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token = cookie.getValue();
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break;
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}
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}
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}
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return token;
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}
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/**
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* 对跨域提供支持
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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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HttpServletRequest httpServletRequest = (HttpServletRequest) request;
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HttpServletResponse httpServletResponse = (HttpServletResponse) response;
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httpServletResponse.setHeader("Access-control-Allow-Origin", httpServletRequest.getHeader("Origin"));
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httpServletResponse.setHeader("Access-Control-Allow-Methods", "GET,POST,OPTIONS,PUT,DELETE");
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httpServletResponse.setHeader("Access-Control-Allow-Headers", httpServletRequest.getHeader("Access-Control-Request-Headers"));
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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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