protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
if (AppState.State.Instance.UserDetails == null)
{
var sharedPrefs = GetSharedPreferences("ChallengeApp", FileCreationMode.Private);
var userDetailsJson = sharedPrefs.GetString("userDetailsJson", null);
if (userDetailsJson == null)
{
StartActivity(typeof(TRegisterActivity));
Finish();
return;
}
AppState.State.Instance.UserDetails = JsonConvert.DeserializeObject <Model.UserDetails>(userDetailsJson);
var kc = new KeyChain.Net.XamarinAndroid.KeyChainHelper(() => this);
if (Guid.TryParse(kc.GetKey("deviceGuid"), out var guid))
{
AppState.State.Instance.DeviceGuid = guid;
}
else
{
StartActivity(typeof(TRegisterActivity));
Finish();
return;
}
}
SetupDb();
OnUserDetailsLoaded();
}
private void OnLoggedIn()
{
UserDetails userDetails = null;
string responseJson;
var request = new HttpWebRequest(new Uri("https://challengethesis.azurewebsites.net/api/users"));
request.Method = "POST";
request.ContentType = "application/json";
request.Headers.Add("SkautISLoginID", _loginId);
try
{
using (var stream = request.GetRequestStream())
using (var streamWriter = new StreamWriter(stream))
{
streamWriter.Write("");
}
}
catch (WebException e)
{
var l = e;
}
using (var response = request.GetResponse())
using (var responseStream = response.GetResponseStream())
using (var streamReader = new StreamReader(responseStream))
{
responseJson = streamReader.ReadToEnd();
}
var responseObject = JsonConvert.DeserializeObject <ParsedRegisterResponse>(responseJson);
userDetails = responseObject.Item1;
using (var sharedPrefs = GetSharedPreferences("ChallengeApp", FileCreationMode.Private))
using (var editor = sharedPrefs.Edit())
{
var userDetailsJson = JsonConvert.SerializeObject(userDetails);
editor.PutString(nameof(userDetailsJson), userDetailsJson);
editor.Commit();
}
var kc = new KeyChain.Net.XamarinAndroid.KeyChainHelper(() => this);
kc.SetKey("deviceGuid", responseObject.Item2.ToString());
kc.SetKey("privateKey", responseObject.Item3);
StartActivity(typeof(WelcomeActivity));
SetResult(Result.Ok);
Finish();
}
// Crypto
private string Sign(string data)
{
var kc = new KeyChain.Net.XamarinAndroid.KeyChainHelper(() => this);
var keyString = kc.GetKey("privateKey");
RsaPrivateCrtKeyParameters privateKey = (RsaPrivateCrtKeyParameters)PrivateKeyFactory.CreateKey(Convert.FromBase64String(keyString));
var signer = SignerUtilities.GetSigner("SHA256withRSA");
signer.Init(true, privateKey);
var bytes = Encoding.UTF8.GetBytes(data);
signer.BlockUpdate(bytes, 0, bytes.Length);
byte[] signature = signer.GenerateSignature();
var signedString = Convert.ToBase64String(signature);
return(signedString);
}
