SwiftLogin.swift

private var refreshTimer: Timer?

public private(set) var tokenExpiryDate: Date? {
    didSet {
        guard let tokenExpiryDate = tokenExpiryDate else { return }

        let timeToExpire = tokenExpiryDate.timeIntervalSinceNow

        // try to refresh JWT token before the expiration time
        let timeToRefresh = Date(timeIntervalSinceNow: timeToExpire * 0.9)

        refreshTimer = Timer.scheduledTimer(withTimeInterval: timeToRefresh.timeIntervalSinceNow, repeats: false) { _ in
            AwesomeAPI.login("test", "test", onSuccess: {}, onFailure: { _ in })
        }
    }
}