1797. Design Authentication Manager
https://leetcode.com/problems/design-authentication-manager
Description
There is an authentication system that works with authentication tokens. For each session, the user will receive a new authentication token that will expire timeToLive
seconds after the currentTime
. If the token is renewed, the expiry time will be extended to expire timeToLive
seconds after the (potentially different) currentTime
.
Implement the AuthenticationManager
class:
AuthenticationManager(int timeToLive)
constructs theAuthenticationManager
and sets thetimeToLive
.generate(string tokenId, int currentTime)
generates a new token with the giventokenId
at the givencurrentTime
in seconds.renew(string tokenId, int currentTime)
renews the unexpired token with the giventokenId
at the givencurrentTime
in seconds. If there are no unexpired tokens with the giventokenId
, the request is ignored, and nothing happens.countUnexpiredTokens(int currentTime)
returns the number of unexpired tokens at the given currentTime.
Note that if a token expires at time t
, and another action happens on time t
(renew
or countUnexpiredTokens
), the expiration takes place before the other actions.
Example 1:
Constraints:
1 <= timeToLive <= 108
1 <= currentTime <= 108
1 <= tokenId.length <= 5
tokenId
consists only of lowercase letters.All calls to
generate
will contain unique values oftokenId
.The values of
currentTime
across all the function calls will be strictly increasing.At most
2000
calls will be made to all functions combined.
ac
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