import Foundation

struct ServerChallenge {
    
    private static let challengeExpiryTime: TimeInterval = 25.0
    
    let creationDate: Date
    
    let message: Message
    
    var isExpired: Bool {
        creationDate.addingTimeInterval(ServerChallenge.challengeExpiryTime) < Date.now
    }
}

typealias ServerResponse = (result: Message, challenge: ServerChallenge?)
typealias OptionalServerResponse = (success: Bool, result: Message?, challenge: ServerChallenge?)