#1797

Design Authentication Manager

specialist · 750 · lc medium +31 · 58.4% accepted · 430 likes · top 55%

Description

Design an AuthenticationManager with token TTL of timeToLive seconds.

- AuthenticationManager(int timeToLive) — initializes the manager.

- generate(string tokenId, int currentTime) — creates a token expiring at currentTime + timeToLive.

- renew(string tokenId, int currentTime) — if the token is unexpired at currentTime, extends its expiry to currentTime + timeToLive; otherwise does nothing.

- countUnexpiredTokens(int currentTime) — returns the count of unexpired tokens.

A token expiring exactly at time t is considered expired before actions at time t.

Example 1:

Input

["AuthenticationManager", "renew", "generate", "countUnexpiredTokens", "generate", "renew", "renew", "countUnexpiredTokens"]

[[5], ["aaa", 1], ["aaa", 2], [6], ["bbb", 7], ["aaa", 8], ["bbb", 10], [15]]

Output

[null, null, null, 1, null, null, null, 0]

Example 2:

Explanation

AuthenticationManager authenticationManager = new AuthenticationManager(5); // Constructs the AuthenticationManager with timeToLive = 5 seconds.

authenticationManager.renew("aaa", 1); // No token exists with tokenId "aaa" at time 1, so nothing happens.

authenticationManager.generate("aaa", 2); // Generates a new token with tokenId "aaa" at time 2.

authenticationManager.countUnexpiredTokens(6); // The token with tokenId "aaa" is the only unexpired one at time 6, so return 1.

authenticationManager.generate("bbb", 7); // Generates a new token with tokenId "bbb" at time 7.

authenticationManager.renew("aaa", 8); // The token with tokenId "aaa" expired at time 7, and 8 >= 7, so at time 8 the renew request is ignored, and nothing happens.

authenticationManager.renew("bbb", 10); // The token with tokenId "bbb" is unexpired at time 10, so the renew request is fulfilled and now the token will expire at time 15.

authenticationManager.countUnexpiredTokens(15); // The token with tokenId "bbb" expires at time 15, and the token with tokenId "aaa" expired at time 7, so currently no token is unexpired, so return 0.

Code

class AuthenticationManager:

    def __init__(self, timeToLive: int):
        

    def generate(self, tokenId: str, currentTime: int) -> None:
        

    def renew(self, tokenId: str, currentTime: int) -> None:
        

    def countUnexpiredTokens(self, currentTime: int) -> int:
        


# Your AuthenticationManager object will be instantiated and called as such:
# obj = AuthenticationManager(timeToLive)
# obj.generate(tokenId,currentTime)
# obj.renew(tokenId,currentTime)
# param_3 = obj.countUnexpiredTokens(currentTime)

class AuthenticationManager:

    def __init__(self, timeToLive: int):
        

    def generate(self, tokenId: str, currentTime: int) -> None:
        

    def renew(self, tokenId: str, currentTime: int) -> None:
        

    def countUnexpiredTokens(self, currentTime: int) -> int:
        


# Your AuthenticationManager object will be instantiated and called as such:
# obj = AuthenticationManager(timeToLive)
# obj.generate(tokenId,currentTime)
# obj.renew(tokenId,currentTime)
# param_3 = obj.countUnexpiredTokens(currentTime)