private RetrievedPreKey RetrieveSelectedFriendPublicPreKey(User SelectedFriend)
{
//Send the SignedPreKey to the server and get the corresponding PreKey response
string apiUrl = "https://ycandgap.me/api_server2.php";
string apiMethod = "getPreKey";
Prekey_Request retrievePreKey_Request = new Prekey_Request();
//get the user SignedPreKey.
ISharedPreferences sharedprefs = PreferenceManager.GetDefaultSharedPreferences(this);
retrievePreKey_Request.PublicSignedPreKeyID = SelectedFriend.SignedPreKeyID;
// make http post request
string response = Http.Post(apiUrl, new NameValueCollection()
{
{ "api_method", apiMethod },
{ "api_data", JsonConvert.SerializeObject(retrievePreKey_Request) }
});
// decode json string to dto object
API_Response3 r = JsonConvert.DeserializeObject <API_Response3>(response);
// check response
if (r != null)
{
if (!r.IsError)
{
return(new RetrievedPreKey()
{
PublicPreKey = new IdentityKey(JsonConvert.DeserializeObject <byte[]>(r.PreKey), 0), PrekeyID = Convert.ToUInt32(r.PreKeyID)
});
}
else
{
//if login fails, pop up an alert message. Wrong username or password or a new user
AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(this);
dialogBuilder.SetMessage(r.ErrorMessage);
//dialogBuilder.SetPositiveButton("Ok", null);
dialogBuilder.Show();
return(null);
}
}
else
{
return(null);
}
}
private void RequestRegister(uint registrationId, IdentityKeyPair identityKeyPair, SignedPreKeyRecord signedPreKey, List <PreKeyRecord> preKeys)
{
//Send the login username and password to the server and get response
string apiUrl = "https://ycandgap.me/api_server2.php";
string apiMethod = "registerUser";
// Login_Request has two properties: username and password
Login_Request myLogin_Request = new Login_Request();
myLogin_Request.Username = username.Text;
myLogin_Request.Password = password.Text.GetHashCode();
myLogin_Request.RegistrationID = registrationId;
myLogin_Request.PublicIdentityKey = JsonConvert.SerializeObject(identityKeyPair.getPublicKey().serialize());
myLogin_Request.PublicSignedPreKeyID = signedPreKey.getId();
myLogin_Request.PublicSignedPreKeySignature = JsonConvert.SerializeObject(signedPreKey.getSignature());
myLogin_Request.PublicSignedPreKey = JsonConvert.SerializeObject(signedPreKey.getKeyPair().getPublicKey().serialize());
// Save in local Database
ISharedPreferences sharedprefs = PreferenceManager.GetDefaultSharedPreferences(this);
ISharedPreferencesEditor editor = sharedprefs.Edit();
// Store identityKeyPair somewhere durable and safe.
editor.PutString("IdentityKeyPair", JsonConvert.SerializeObject(identityKeyPair.serialize()));
editor.PutString("SignedPreKey", JsonConvert.SerializeObject(signedPreKey.serialize()));
editor.PutString("Username", username.Text);
editor.PutInt("Password", password.Text.GetHashCode());
// Store registrationId somewhere durable and safe.
editor.PutString("RegistrationId", registrationId.ToString());
editor.Apply();
// make http post request
string response = Http.Post(apiUrl, new NameValueCollection()
{
{ "api_method", apiMethod },
{ "api_data", JsonConvert.SerializeObject(myLogin_Request) }
});
// decode json string to dto object
API_Response r = JsonConvert.DeserializeObject <API_Response>(response);
if (r != null)
{
if (!r.IsError)
{
foreach (PreKeyRecord preKey in preKeys)
{
Prekey_Request preKey_Request = new Prekey_Request();
preKey_Request.PublicSignedPreKeyID = signedPreKey.getId();
preKey_Request.PublicPreKeyID = preKey.getId();
preKey_Request.PublicPreKey = JsonConvert.SerializeObject(preKey.getKeyPair().getPublicKey().serialize());
apiMethod = "storePreKeys";
// make http post request
string preKeyResponse = Http.Post(apiUrl, new NameValueCollection()
{
{ "api_method", apiMethod },
{ "api_data", JsonConvert.SerializeObject(preKey_Request) }
});
// decode json string to dto object
API_Response preKeyR = JsonConvert.DeserializeObject <API_Response>(preKeyResponse);
if (preKeyR == null)
{
break;
}
}
}
}
}
