shiro登陆流程

Posted 2020-10-07

登录请求被FormAuthenticationFilter拦截

FormAuthenticationFilter会执行其父类AdviceFilter的doFilterInternal方法

其代码如下：

boolean continueChain = preHandle(request, response);//判断是否执行后面的操作
if (continueChain) {
　　executeChain(request, response, chain);//放行
}
 postHandle(request, response);//执行完操作后的操作　　

而preHandle调用PathMatchingFilter.preHandle -> isFilterChainContinued,再调用AccessControlFilter.onPreHandle

onPreHandle(request, response, pathConfig){
    return isAccessAllowed(request, response, mappedValue)/*判断是否允许通过，如果不允许则执行onAccessDenied*/
|| onAccessDenied(request, response, mappedValue);
}

//AuthenticatingFilter.isAccessAllowed(request, response, mappedValue)的代码如下
protected boolean isAccessAllowed(ServletRequest request, ServletResponse response, Object mappedValue) {
　　return super.isAccessAllowed(request, response, mappedValue)/*返回是否登录 return subject.isAuthenticated*/ 
||(!isLoginRequest(request, response) && isPermissive(mappedValue));
/*不是loginUrl请求，并且是permissive的Url请求;PathMatchingFilter的appliedPaths将filterChainDefinitions中的值转为map，permissive就是从这里取得*/ 

}

//FormAuthenticationFilter.onAccessDenied(request, response)的代码如下
if (isLoginRequest(request, response)) {
　　if (isLoginSubmission(request, response)) {//如果是loginUrl并且是post请求，执行登录请求
　　　　return executeLogin(request, response);
　　} else {//如果是loginUrl并且是get请求，则运行放行，否则调到get的loginUrl
　　　　return ture;
   }
} else {
    saveRequestAndRedirectToLogin(request, response);
//如果不是loginUrl，跳转到get的loginUrl
　　return false;
}

//当点击post请求的loginUrl后，执行executeLogin,代码如下
AuthenticationToken token = createToken(request, response);//抽象方法，待实现。可通过request，设置AuthenticationToken的username,password
if (token == null) {
　　throw new IllegalStateException(msg);
}
try {
　　Subject subject = getSubject(request, response);
　　subject.login(token);//此时调用realm的doGetAuthenticationInfo,在这里判断登录账号密码是否匹配，成功，则return AuthenticationInfo,失败，则返回异常（同时此处可设置session等）
　　return onLoginSuccess(token, subject, request, response);//如果subject.login成功，则执行onLoginSuccess，否则，进入catch
} catch (AuthenticationException e) { 　　
　　return onLoginFailure(token, e, request, response); 
}