private async void RegisterProcess(UserRegistration singleuser)
{
await manager.SaveTaskAsync(singleuser);
//await manager.CurrentClient.GetTable<UserRegistration>().InsertAsync(singleuser);
}
public RegistrationViewModel()
{
//if session is valid, redirect the user
if (Application.Current.Properties.ContainsKey("email"))
{
Context.Navigation.PushModalAsync(new TabPage());
}
manager = RegistrationManager.DefaultManager;
register_clicked = new Command(async() =>
{
//create db if not exists
int count = 0;
bool validEmail = await IsEmailValid(Email);
//if any field is empty
if (First == null || Last == null || Mobile == null ||
Email == null || Password == null || Confirm_password == null)
{
await Context.DisplayAlert("Error", "You can't leave any field empty.", "OK");
count++;
}
//if the email already exists
else if (!validEmail)
{
await Context.DisplayAlert("Error", "The email already exists. Please use a different email.", "OK");
count++;
}
//if password doesn't match
else if (Password != Confirm_password)
{
await Context.DisplayAlert("Error", "Password Doesn't match.", "OK");
count++;
}
//if password length is less than 6
else if (Password.Length < 6)
{
await Context.DisplayAlert("Error", "Password Length should be greater than 5.", "OK");
count++;
}
//if mobile number length is less than 10 and does not cosist of numerical numbers
else if (!Regex.IsMatch(Mobile, @"^[0-9]{10}$"))
{
await Context.DisplayAlert("Error", "Mobile Number length must be 10 and consist of numerical numbers.", "OK");
count++;
}
//check if it is name
else if (!Regex.IsMatch(First, @"^[\p{L} \.\-]+$") || !Regex.IsMatch(Last, @"^[\p{L} \.\-]+$"))
{
await Context.DisplayAlert("Error", "Your first name or last name is not a name", "OK");
count++;
}
//check if it is in email format, catch the exception when it is not formatted well
if (count <= 0)
{
try
{
MailAddress m = new MailAddress(Email);
}
catch (FormatException)
{
await Context.DisplayAlert("Error", "Please check the format of your email.", "OK");
count++;
}
catch (System.ArgumentNullException)
{
await Context.DisplayAlert("Error", "You can't leave any field empty.", "OK");
count++;
}
}
//if there is no problem, insert the user to db
if (count <= 0)
{
UserRegistration registeruser = new UserRegistration();
registeruser.Email = Email;
registeruser.FirstName = First;
registeruser.LastName = Last;
registeruser.ImageURL = "";
//encrypt password
byte[] encryptpwd = System.Text.Encoding.ASCII.GetBytes(Password);
encryptpwd = new System.Security.Cryptography.SHA256Managed().ComputeHash(encryptpwd);
String hashedpwd = System.Text.Encoding.ASCII.GetString(encryptpwd);
registeruser.Pwd = hashedpwd;
registeruser.PhoneNumber = Mobile;
try
{
RegisterProcess(registeruser);
}
catch (Exception ex)
{
Debug.WriteLine(ex.Message.ToString());
}
await Context.DisplayAlert("Successful", "You have successfully registered.", "OK");
await Context.Navigation.PushModalAsync(new LogIn());
}
});//register_clicked event triggered
signin_clicked = new Command(() =>
{
Context.Navigation.PushModalAsync(new LogIn());
});
}
public LogInViewModel()
{
//if session is valid, redirect the user
if (Application.Current.Properties.ContainsKey("email"))
{
Context.Navigation.PushModalAsync(new TabPage());
}
manager = RegistrationManager.DefaultManager;
register_clicked = new Command(async() =>
{
await Context.Navigation.PushModalAsync(new Registration());
});
login_Clicked = new Command(async() =>
{
int count = 0;
UserRegistration getsingleuser = null;
if (Email == null || Password == null)
{
await Context.DisplayAlert("Error", "You can't leave any field empty.", "OK");
count++;
}
else
{
try
{
var findpwd = await manager.GetPassword(Email);
var list = new List <UserRegistration>(findpwd);
getsingleuser = list.ToArray()[0];
}
catch (IndexOutOfRangeException)
{
await Context.DisplayAlert("Error", "The email doesn't exist", "OK");
count++;
}
}
if (count <= 0 && !Application.Current.Properties.ContainsKey("email"))
{
try
{
byte[] encryptpwd = System.Text.Encoding.ASCII.GetBytes(Password);
encryptpwd = new System.Security.Cryptography.SHA256Managed().ComputeHash(encryptpwd);
String hashedpwd = System.Text.Encoding.ASCII.GetString(encryptpwd);
if (getsingleuser.Pwd == hashedpwd && count <= 0)
{
Application.Current.Properties["first"] = getsingleuser.FirstName;
Application.Current.Properties["last"] = getsingleuser.LastName;
Application.Current.Properties["phone"] = getsingleuser.PhoneNumber;
Application.Current.Properties["email"] = getsingleuser.Email;
Application.Current.Properties["password"] = getsingleuser.Pwd;
//Application.Current.Properties.Clear();
await Context.DisplayAlert("Successful", "You now logged in.", "OK");
await Context.Navigation.PushModalAsync(mainPage);
}
else
{
await Context.DisplayAlert("Error", "You have entered a wrong password.", "OK");
count++;
}
}
catch (NullReferenceException)
{
count++;
}
}
});
}
