public async Task LoginCommand()
{
var connection = new UsernamePasswordConnection(_hostAddress, _userName, _view.LoginPasswordBox.Password);
var manager = new YoutrackManager(connection);
var error = await manager.CheckConnection().ConfigureAwait(false);
if (error == null)
{
LogonSuccess?.Invoke(null, new LogonEventArgs(connection));
}
}
// Validate the username and password against the Users collection in the MainWindow window
private void Logon_Click(object sender, RoutedEventArgs e)
{
// Find the user in the list of possible users - first check whether the user is a Teacher
// TODO: Exercise 1: Task 3a: Use the VerifyPassword method of the Teacher class to verify the teacher's password
var teacher = (from Teacher t in DataSource.Teachers
where string.CompareOrdinal(t.UserName, username.Text) == 0 &&
t.VerifyPassword(password.Password) == 0
select t).FirstOrDefault();
// If the UserName of the user retrieved by using LINQ is non-empty then the user is a teacher
// TODO: Exercise 1: Task 3b: Check whether teacher is null before examining the UserName property
if (teacher != null && !string.IsNullOrEmpty(teacher.UserName))
{
// Save the UserID and Role (teacher or student) and UserName in the global context
SessionContext.UserID = teacher.TeacherID;
SessionContext.UserRole = Role.Teacher;
SessionContext.UserName = teacher.UserName;
SessionContext.CurrentTeacher = teacher;
// Raise the LogonSuccess event and finish
LogonSuccess?.Invoke(this, null);
return;
}
// If the user is not a teacher, check whether the username and password match those of a student
else
{
// TODO: Exercise 1: Task 3c: Use the VerifyPassword method of the Student class to verify the student's password
var student = (from Student s in DataSource.Students
where string.CompareOrdinal(s.UserName, username.Text) == 0 &&
s.VerifyPassword(password.Password) == 0
select s).FirstOrDefault();
// If the UserName of the user retrieved by using LINQ is non-empty then the user is a student
// TODO: Exercise 1: Task 3d: Check whether student is null before examining the UserName property
if (student != null && !string.IsNullOrEmpty(student.UserName))
{
// Save the details of the student in the global context
SessionContext.UserID = student.StudentID;
SessionContext.UserRole = Role.Student;
SessionContext.UserName = student.UserName;
SessionContext.CurrentStudent = student;
// Raise the LogonSuccess event and finish
LogonSuccess?.Invoke(this, null);
return;
}
}
// If the credentials do not match those for a Teacher or for a Student then they must be invalid
// Raise the LogonFailed event
LogonFailed(this, null);
}
// TODO: Exercise 3: Task 1a: Define LogonFailed event
#endregion
#region Logon Validation
// TODO: Exercise 3: Task 1b: Validate the username and password against the Users collection in the MainWindow window
private void Logon_Click(object sender, RoutedEventArgs e)
{
var teacherQuery =
from Teacher teacher in DataSource.Teachers
where teacher.UserName == username.Text && // User exists
teacher.Password == password.Password // Password is correct
select teacher;
var studentQuery =
from Student student in DataSource.Students
where student.UserName == username.Text &&
student.Password == password.Password
select student;
if (teacherQuery.Count() == 1) // Only if there's exactly one match!
{
Teacher signedInTeacher = teacherQuery.First();
// Save current teacher in SessionContext
SessionContext.UserName = signedInTeacher.UserName;
SessionContext.UserID = signedInTeacher.TeacherID;
SessionContext.UserRole = Role.Teacher;
SessionContext.CurrentTeacher = signedInTeacher;
// Raise succes event
LogonSuccess?.Invoke(sender, e); // ? checker om LogonSucces er null (ingen lyttere) før den kalder invoke på alle.
return;
}
else if (studentQuery.Count() == 1)
{
Student signedInStudent = studentQuery.First();
// Save current teacher in SessionContext
SessionContext.UserName = signedInStudent.UserName;
SessionContext.UserID = signedInStudent.StudentID;
SessionContext.UserRole = Role.Student;
SessionContext.CurrentStudent = signedInStudent;
LogonSuccess?.Invoke(sender, e); // ? checker om LogonSucces er null (ingen lyttere) før den kalder invoke på alle.
return;
}
LogonFailed?.Invoke(sender, e); // Raise failed event
}
// TODO: Exercise 1: Task 2b: Implement the Logon_Click event handler for the Logon button
// Simulate logging on (no validation or authentication performed yet)
private void Logon_Click(object sender, RoutedEventArgs e)
{
if (!string.IsNullOrEmpty(username.Text) && !string.IsNullOrEmpty(password.Password))
{
Teacher teacher = DataSource.Teachers.FirstOrDefault(t => t.UserName == username.Text && t.Password == this.password.Password);
if (teacher != null)
{
SessionContext.UserRole = Role.Teacher;
SessionContext.UserID = teacher.TeacherID;
SessionContext.UserName = teacher.UserName;
SessionContext.CurrentTeacher = teacher;
LogonSuccess?.Invoke(this, null);
}
else
{
Student student = DataSource.Students.FirstOrDefault(s => s.UserName == username.Text && s.Password == this.password.Password);
if (student != null)
{
SessionContext.UserRole = Role.Student;
SessionContext.UserID = student.StudentID;
SessionContext.UserName = student.UserName;
SessionContext.CurrentStudent = student;
LogonSuccess?.Invoke(this, null);
}
else
{
LogonFailed?.Invoke(this, null);
}
}
}
else
{
LogonFailed?.Invoke(this, null);
}
}
// TODO: Exercise 3: Task 1b: Validate the username and password against the Users collection in the MainWindow window
private void Logon_Click(object sender, RoutedEventArgs e)
{
var user = username.Text;
var pass = password.Password;
var teacher = (DataSource.Teachers.Cast <Teacher>()
.Where(t => String.CompareOrdinal(t.UserName, user) == 0 && String.CompareOrdinal(t.Password, pass) == 0))
.FirstOrDefault();
if (teacher.UserName != null)
{
SessionContext.UserRole = Role.Teacher;
SessionContext.UserID = teacher.TeacherID;
SessionContext.UserName = teacher.UserName;
SessionContext.CurrentTeacher = teacher;
LogonSuccess?.Invoke(this, null);
}
else
{
LogonFailed?.Invoke(this, null);
}
}