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一个"诡异"的oauth权限问题

背景: 后端接口采用oauth授权, node服务端申请到一个帐号, 并被授予权限x, 调用后端某接口. 当node首次启动时, 会用帐号去获取token. 后续在access token(简称AT) 过期之前, 通过refresh token(后续简称RT)获取新的AT.

症状为生产服务器AT偶发丢失权限x, 几分钟后症状自动消失, token未更换. 测试服无法复现问题. 后发现用帐号重新登录一次权限也可以恢复, token仍然是原来的token.

最后终于找到原因, 问题主要出在RT上面. 由于权限x是后续增加的, 获取RT的时候并未获取此权限, 而此RT的有效期又被设为了一年. 当用这个无权限的老RT去刷新AT之后, 新获取的AT也同样没有权限x. 而用帐号重新登录之后, 又会把此时帐号拥有的x权限授予当前的AT. 这个AT仍然是之前用RT刷新得到的AT, 只是登录之后拿到了权限x.

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