Certificate comparison to confirm secure SSL handshake using URLSession delegate

urlSessionDelegateAndPinning

func urlSession(_ session: URLSession, didReceive challenge: URLAuthenticationChallenge, completionHandler: @escaping (URLSession.AuthChallengeDisposition, URLCredential?) -> Void) {
    if let trust = challenge.protectionSpace.serverTrust,
         SecTrustGetCertificateCount(trust) > 0 {
      if let certificate = SecTrustGetCertificateAtIndex(trust, 0) {
        let data = SecCertificateCopyData(certificate) as Data
        
        if certificates.contains(data) {
            completionHandler(.useCredential, URLCredential(trust: trust))
            return
        }
      }

    }
  completionHandler(.cancelAuthenticationChallenge, nil)
}