private void HandleStreamingContentKeyRequest(AVContentKeyRequest keyRequest)
{
var contentKeyIdentifierString = keyRequest.Identifier.ToString();
if (string.IsNullOrEmpty(contentKeyIdentifierString))
{
Debug.WriteLine("Failed to retrieve the assetID from the keyRequest!");
return;
}
var contentKeyIdentifierUrl = new NSUrl(contentKeyIdentifierString);
var assetIdString = contentKeyIdentifierUrl.Host;
var assetIdData = NSData.FromString(assetIdString, NSStringEncoding.UTF8);
Action provideOnlineKey = () =>
{
var applicationCertificate = RequestApplicationCertificate();
try
{
var keys = new[] { new NSString(AVContentKeyRequest.ProtocolVersions) };
var numbers = new NSMutableArray <NSNumber>();
numbers.Add(new NSNumber(1));
var objects = new NSObject[] { numbers };
var options = new NSDictionary <NSString, NSObject>(keys, objects);
keyRequest.MakeStreamingContentKeyRequestData(applicationCertificate, assetIdData, options, async(data, error) => {
var ckcData = await this.RequestContentKeyFromKeySecurityModule(data, assetIdString);
if (ckcData == null)
{
return;
}
var keyResponse = AVContentKeyResponse.Create(ckcData);
keyRequest.Process(keyResponse);
});
}
catch (Exception ex)
{
Debug.WriteLine($"Failed to make streaming content key request data: {ex.Message}");
}
};
/*
* When you receive an AVContentKeyRequest via -contentKeySession:didProvideContentKeyRequest:
* and you want the resulting key response to produce a key that can persist across multiple
* playback sessions, you must invoke -respondByRequestingPersistableContentKeyRequest on that
* AVContentKeyRequest in order to signal that you want to process an AVPersistableContentKeyRequest
* instead. If the underlying protocol supports persistable content keys, in response your
* delegate will receive an AVPersistableContentKeyRequest via -contentKeySession:didProvidePersistableContentKeyRequest:.
*/
if (ShouldRequestPersistableContentKey(assetIdString) || PersistableContentKeyExistsOnDisk(assetIdString))
{
try
{
NSError error;
keyRequest.RespondByRequestingPersistableContentKeyRequest(out error);
if (error != null)
{
throw new Exception($"Error requesting persistable content key: {error.ToString()}");
}
}
catch (Exception ex)
{
Debug.WriteLine(ex.Message);
/*
* This case will occur when the client gets a key loading request from an AirPlay Session.
* You should answer the key request using an online key from your key server.
*/
provideOnlineKey();
}
return;
}
try
{
provideOnlineKey();
}
catch (Exception ex)
{
Debug.WriteLine(ex.Message);
}
}
private void HandlePersistableContentKeyRequest(AVPersistableContentKeyRequest keyRequest)
{
/*
* The key ID is the URI from the EXT-X-KEY tag in the playlist (e.g. "skd://key65") and the
* asset ID in this case is "key65".
*/
var contentKeyIdentifierString = keyRequest.Identifier as NSString;
if (contentKeyIdentifierString == null)
{
Debug.WriteLine("Failed to retrieve the assetID from the keyRequest!");
return;
}
var contentKeyIdentifierUrl = new NSUrl(contentKeyIdentifierString);
var assetIdString = contentKeyIdentifierUrl.Host;
var assetIdData = NSData.FromString(assetIdString, NSStringEncoding.UTF8);
Action <NSData, NSError> completionHandler = async(data, error) =>
{
if (error != null)
{
keyRequest.Process(error);
pendingPersistableContentKeyIdentifiers.Remove(assetIdString);
return;
}
if (data == null)
{
return;
}
try
{
var ckcData = await RequestContentKeyFromKeySecurityModule(data, assetIdString);
NSData persistentKey = keyRequest.GetPersistableContentKey(ckcData, null, out error);
WritePersistableContentKey(persistentKey, new NSString(assetIdString));
/*
* AVContentKeyResponse is used to represent the data returned from the key server when requesting a key for
* decrypting content.
*/
var keyResponse = AVContentKeyResponse.Create(persistentKey);
/*
* Provide the content key response to make protected content available for processing.
*/
keyRequest.Process(keyResponse);
string assetName = string.Empty;
bool assetRemoved = false;
if (contentKeyToStreamNameMap.TryGetValue(assetIdString, out assetName))
{
assetRemoved = contentKeyToStreamNameMap.Remove(assetIdString);
}
if (!string.IsNullOrWhiteSpace(assetName) && assetRemoved && !contentKeyToStreamNameMap.ContainsKey(assetIdString))
{
var userInfo = new Dictionary <string, object>();
userInfo["name"] = assetName;
var userInfoDictionary = NSDictionary.FromObjectsAndKeys(userInfo.Values.ToArray(), userInfo.Keys.ToArray());
NSNotificationCenter.DefaultCenter.PostNotificationName(ContentKeyDelegate.DidSaveAllPersistableContentKey, null, userInfoDictionary);
}
pendingPersistableContentKeyIdentifiers.Remove(assetIdString);
}
catch (Exception ex)
{
pendingPersistableContentKeyIdentifiers.Remove(assetIdString);
Debug.WriteLine(ex.Message);
}
};
try
{
var applicationCertificate = RequestApplicationCertificate();
var keys = new[] { new NSString(AVContentKeyRequest.ProtocolVersions) };
var numbers = new NSMutableArray <NSNumber>();
numbers.Add(new NSNumber(1));
var objects = new NSObject[] { numbers };
var options = new NSDictionary <NSString, NSObject>(keys, objects);
if (PersistableContentKeyExistsOnDisk(assetIdString))
{
var urlToPersistableKey = CreateUrlForPersistableContentKey(assetIdString);
var contentKey = NSFileManager.DefaultManager.Contents(urlToPersistableKey.Path);
if (contentKey == null)
{
pendingPersistableContentKeyIdentifiers.Remove(assetIdString);
/*
* Key requests should never be left dangling.
* Attempt to create a new persistable key.
*/
keyRequest.MakeStreamingContentKeyRequestData(applicationCertificate, assetIdData, options, completionHandler);
return;
}
/*
* Create an AVContentKeyResponse from the persistent key data to use for requesting a key for
* decrypting content.
*/
var keyResponse = AVContentKeyResponse.Create(contentKey);
keyRequest.Process(keyResponse);
return;
}
keyRequest.MakeStreamingContentKeyRequestData(applicationCertificate, assetIdData, options, completionHandler);
}
catch (Exception ex)
{
Debug.WriteLine($"Failure responding to an AVPersistableContentKeyRequest when attemping to determine if key is already available for use on disk. {ex.Message}");
}
}