CreateToken takes an ID and generates a Tokens.

ExtractRefreshToken extracts an refresh token from request cookie.

ExtractToken extracts an access token from request header.

ExtractUserId takes a http.Request and returns the corresponding user id.

RefreshAccessToken takes a refresh token and updates the expiry time of the access token.

StillValid takes a jwt.Token and verifies it hasn't expired.

VerifyRefreshToken verifies a refresh token is legit.

VerifyToken verifies a token is legit.

Claims holds a UserId and standard claims.

Tokens holds an access token and a refresh token.