概述
Shiro是apache旗下一个开源安全框架(http://shiro.apache.org/)，它将软件系统的安全认证相关的功能抽取出来，实现用户身份认证，权限授权、加密、会话管理等功能，组成了一个通用的安全认证框架。使用shiro就可以非常快速的完成认证、授权等功能的开发，降低系统成本。
Shiro框架三大核心对象
说明：
1)Subject :主体对象，负责提交用户认证和授权信息。
2)SecurityManager：安全管理器，负责认证，授权等业务实现。（核心）
3)Realm：领域对象，负责从数据层获取业务数据。
shrio 拦截认证全过程
1.FilterRegistrationBean过滤注册bean
@Bean
public FilterRegistrationBean shiroFilterRegistration() {
FilterRegistrationBean registration = new FilterRegistrationBean();
registration.setFilter(new DelegatingFilterProxy("shiroFilter"));
//该值缺省为false，表示生命周期由SpringApplicationContext管理，设置为true则表示由ServletContainer管理
registration.addInitParameter("targetFilterLifecycle", "true");
registration.setEnabled(true);
registration.setOrder(Integer.MAX_VALUE - 1);
registration.addUrlPatterns("
@Override
protected boolean onAccessDenied(ServletRequest request, ServletResponse response) throws Exception {
//获取请求token，如果token不存在，直接返回401
String token = getRequestToken((HttpServletRequest) request);
if(StringUtils.isBlank(token)){
HttpServletResponse httpResponse = (HttpServletResponse) response;
httpResponse.setContentType("application/json;charset=utf-8");
httpResponse.setHeader("Access-Control-Allow-Credentials", "true");
httpResponse.setHeader("Access-Control-Allow-Origin", HttpContextUtils.getOrigin());
String json = new Gson().toJson(new Result().error(ErrorCode.UNAUTHORIZED));
httpResponse.getWriter().print(json);
return false;
}
return executeLogin(request, response);
}
4.调用父类 executeLogin 进行登录验证
protected boolean executeLogin(ServletRequest request, ServletResponse response) throws Exception {
AuthenticationToken token = this.createToken(request, response);
if (token == null) {
String msg = "createToken method implementation returned null. A valid non-null AuthenticationToken must be created in order to execute a login attempt.";
throw new IllegalStateException(msg);
} else {
try {
Subject subject = this.getSubject(request, response);
subject.login(token);
return this.onLoginSuccess(token, subject, request, response);
} catch (AuthenticationException var5) {
return this.onLoginFailure(token, var5, request, response);
}
}
}
5.subject.login(token); 进行登录
login方法被DelegatingSubject重写
public void login(AuthenticationToken token) throws AuthenticationException {
**
Subject subject = this.securityManager.login(this, token);
**
}
6.securityManager.login(this, token) login被DefaultSecurityManager
接下来几步没那么重要省略部分
7.ModularRealmAuthenticator AuthenticationInfo 授权信息获取方法
protected AuthenticationInfo doAuthenticate(AuthenticationToken authenticationToken) throws AuthenticationException {
this.assertRealmsConfigured();
Collection<Realm> realms = this.getRealms();
return realms.size() == 1 ? this.doSingleRealmAuthentication((Realm)realms.iterator().next(), authenticationToken) : this.doMultiRealmAuthentication(realms, authenticationToken);
}
getRealms 获取我们自己重写的Realms类，主要用户获取用户信息
8.接下来则进入我们自己写的Realms类 我的类叫Oauth2Realm
@Override
protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken token) throws AuthenticationException {
String accessToken = (String) token.getPrincipal();
//根据accessToken，查询用户信息
SysUserTokenEntity tokenEntity = shiroService.getByToken(accessToken);
//token失效
if(tokenEntity == null || tokenEntity.getExpireDate().getTime() < System.currentTimeMillis()){
throw new IncorrectCredentialsException(MessageUtils.getMessage(ErrorCode.TOKEN_INVALID));
}
//查询用户信息
SysUserEntity userEntity = shiroService.getUser(tokenEntity.getUserId());
//转换成UserDetail对象
UserDetail userDetail = ConvertUtils.sourceToTarget(userEntity, UserDetail.class);
//获取用户对应的部门数据权限
List<Long> deptIdList = shiroService.getDataScopeList(userDetail.getId());
userDetail.setDeptIdList(deptIdList);
//账号锁定
if(userDetail.getStatus() == 0){
throw new LockedAccountException(MessageUtils.getMessage(ErrorCode.ACCOUNT_LOCK));
}
SimpleAuthenticationInfo info = new SimpleAuthenticationInfo(userDetail, accessToken, getName());
return info;
}
负责获取用户信息的方法
这并不是登录的过程，而是授权过滤的过程，通过token到数据库查询是否有这个用户，且没有过期，则证明已经登录。
总结
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