Here is the sample code -- obviously having a kerberos setup is tough to have publicly available -- i've left only the download task since simply changing the config below will trigger failure/success
import UIKit
import Foundation
let URL = "https://some_kerberos_protected_file"
class ViewController: UIViewController, NSURLSessionDelegate, NSURLSessionTaskDelegate, NSURLSessionDataDelegate, NSURLSessionDownloadDelegate {
private let downloadURL = NSURL(string: URL)!
private var session: NSURLSession!
private var downloadTask: NSURLSessionDownloadTask!
override func viewDidLoad() {
super.viewDidLoad()
navigationItem.rightBarButtonItem = UIBarButtonItem(title: "Download", style: .Plain, target: self, action: "download:")
var config = NSURLSessionConfiguration.defaultSessionConfiguration()
//let config = NSURLSessionConfiguration.backgroundSessionConfigurationWithIdentifier("DownloadIdentifier")
session = NSURLSession(configuration:config, delegate: self, delegateQueue: nil)
downloadTask = session.downloadTaskWithURL(downloadURL)
}
func download(sender: UIBarButtonItem) {
downloadTask.resume()
}
func URLSession(session: NSURLSession, didReceiveChallenge challenge: NSURLAuthenticationChallenge, completionHandler: (NSURLSessionAuthChallengeDisposition, NSURLCredential?) -> Void) {
print("challenged")
completionHandler(.PerformDefaultHandling, nil)
}
func URLSession(session: NSURLSession, task: NSURLSessionTask, didReceiveChallenge challenge: NSURLAuthenticationChallenge, completionHandler: (NSURLSessionAuthChallengeDisposition, NSURLCredential?) -> Void) {
print("Challenged")
completionHandler(.PerformDefaultHandling, nil)
}
func URLSession(session: NSURLSession, task: NSURLSessionTask, didCompleteWithError error: NSError?) {
print("ERROR: \(error)")
}
func URLSession(session: NSURLSession, dataTask: NSURLSessionDataTask, didReceiveResponse response: NSURLResponse, completionHandler: (NSURLSessionResponseDisposition) -> Void) {
print("response: \(response)")
if (response as! NSHTTPURLResponse).statusCode == 401 {
completionHandler(.Allow)
} else {
completionHandler(.BecomeDownload)
}
}
func URLSession(session: NSURLSession, dataTask: NSURLSessionDataTask, didBecomeDownloadTask downloadTask: NSURLSessionDownloadTask) {
print("became download task")
}
func URLSession(session: NSURLSession, dataTask: NSURLSessionDataTask, didReceiveData data: NSData) {
print("received data: \(data)")
}
func URLSession(session: NSURLSession, downloadTask: NSURLSessionDownloadTask, didFinishDownloadingToURL location: NSURL) {
print("finished downloading: \(location)")
let paths = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.UserDomainMask, true)
do {
try NSFileManager.defaultManager().moveItemAtURL(location, toURL: NSURL.fileURLWithPath((paths[0] ) + "/output.file"))
} catch _ {
}
}
func URLSession(session: NSURLSession, downloadTask: NSURLSessionDownloadTask, didWriteData bytesWritten: Int64, totalBytesWritten: Int64, totalBytesExpectedToWrite: Int64) {
print("progress: \(bytesWritten) of \(totalBytesExpectedToWrite)")
}
}
