#3

class SSLPinningURLSessionDelegate: NSObject, URLSessionDelegate {

    private let md5Fingerprint: String

    init(md5Fingerprint: String) {
        print("inited")
        self.md5Fingerprint = md5Fingerprint
    }

    deinit {
        print("SSLPinningURLSessionDelegate deinited")
    }

    func urlSession(_ session: URLSession, didReceive challenge: URLAuthenticationChallenge, completionHandler: @escaping (URLSession.AuthChallengeDisposition, URLCredential?) -> Swift.Void) {
        if !Global.isSSLPinningEnabled || challenge.isTrusted(md5Fingerprint: md5Fingerprint) {
            let credential = URLCredential(trust: challenge.protectionSpace.serverTrust!)
            completionHandler(.useCredential, credential)
        } else {
            completionHandler(.cancelAuthenticationChallenge, nil)
        }
    }

}