package com.yuanchu.limslaboratory.shiro.filter;
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import com.yuanchu.limslaboratory.shiro.JwtToken;
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import com.yuanchu.limslaboratory.shiro.utils.JwtUtils;
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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.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import org.springframework.http.HttpStatus;
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import org.springframework.stereotype.Component;
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import org.springframework.util.ObjectUtils;
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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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@Component
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public class JwtFilter extends BasicHttpAuthenticationFilter {
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private Logger log = LoggerFactory.getLogger(this.getClass());
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public Integer code;
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public String message;
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/**
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* 前置处理
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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 = 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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* 后置处理
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*/
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@Override
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protected void postHandle(ServletRequest request, ServletResponse response) {
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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
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* 返回 true 则允许访问
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* 返回false 则禁止访问，会进入 onAccessDenied()
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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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// 如果token为空不让通过
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String header = ((HttpServletRequest) request).getHeader(JwtUtils.AUTH_HEADER);
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if (ObjectUtils.isEmpty(header)){
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code = 503;
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message = "STS token解码过程中，由于内部调用失败导致解码失败，请稍后再试。";
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return false;
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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 = executeLogin(request, response);
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} catch (IllegalStateException e) { // not found any token
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log.error("Not found any token");
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} catch (Exception e) {
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log.error("Error occurs when login", e);
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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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* 身份验证,检查 JWT token 是否合法
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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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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 "
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+ "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); // 交给 Shiro 去进行登录验证
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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 里提取 JWT token
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*/
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@Override
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protected AuthenticationToken createToken(ServletRequest servletRequest, ServletResponse servletResponse) {
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HttpServletRequest httpServletRequest = (HttpServletRequest) servletRequest;
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String authorization = httpServletRequest.getHeader(JwtUtils.AUTH_HEADER);
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JwtToken token = new JwtToken(authorization);
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return token;
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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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*/
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@Override
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protected boolean onAccessDenied(ServletRequest servletRequest, ServletResponse servletResponse) throws Exception {
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HttpServletResponse httpResponse = WebUtils.toHttp(servletResponse);
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httpResponse.setCharacterEncoding("UTF-8");
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httpResponse.setContentType("application/json;charset=UTF-8");
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httpResponse.setStatus(HttpStatus.UNAUTHORIZED.value());
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PrintWriter writer = httpResponse.getWriter();
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writer.write("{\"errCode\": "+ code +", \"msg\": \"" + message +"\"}");
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fillCorsHeader(WebUtils.toHttp(servletRequest), httpResponse);
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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，会进入该方法
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*/
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@Override
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protected boolean onLoginSuccess(AuthenticationToken token, Subject subject, ServletRequest request,
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ServletResponse response) {
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HttpServletResponse httpResponse = WebUtils.toHttp(response);
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String newToken = null;
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if (token instanceof JwtToken) {
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newToken = JwtUtils.refreshTokenExpired(token.getCredentials().toString(), JwtUtils.SECRET);
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}
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if (newToken != null)
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httpResponse.setHeader(JwtUtils.AUTH_HEADER, newToken);
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return true;
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}
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/**
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* Shiro 利用 JWT token 登录失败，会进入该方法
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*/
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@Override
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protected boolean onLoginFailure(AuthenticationToken token, AuthenticationException e, ServletRequest request,
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ServletResponse response) {
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// 此处直接返回 false ，交给后面的 onAccessDenied()方法进行处理
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String error = e.getClass().toString().split("\\.")[4];
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if (error.equals("IncorrectCredentialsException")) {
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code = 10010;
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} else {
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code = 401;
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}
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message = e.getMessage();
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return false;
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}
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/**
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* 添加跨域支持
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*/
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protected void fillCorsHeader(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) {
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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,HEAD");
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httpServletResponse.setHeader("Access-Control-Allow-Headers",
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httpServletRequest.getHeader("Access-Control-Request-Headers"));
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}
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}
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