private string SignInAdmin(LoginLogicModel model)
{
using (var context = new AASDBContext())
{
var admin = context.Admins.SingleOrDefault(a => a.Username == model.Username);
if (admin == null)
{
throw new LoginErrorException();
}
if (string.IsNullOrWhiteSpace(admin.Salt))
{
admin.Salt = PasswordHashProvider.GenerateSalt();
admin.Password = PasswordHashProvider.ComputePasswordHash(admin.Password.Trim(), admin.Salt);
context.SaveChanges();
}
var hash = PasswordHashProvider.ComputePasswordHash(model.Password, admin.Salt);
if (admin.Password != hash)
{
throw new LoginErrorException();
}
return(ComposeToken(model.Username, UserType.AdminUserType));
}
}
private string SignInStudent(LoginLogicModel model)
{
using (var context = new AASDBContext())
{
var student = context.Students.SingleOrDefault(a => a.Email == model.Username);
if (student == null)
{
throw new LoginErrorException();
}
if (string.IsNullOrWhiteSpace(student.Salt))
{
student.Salt = PasswordHashProvider.GenerateSalt();
student.Password = PasswordHashProvider.ComputePasswordHash(student.Password.Trim(), student.Salt);
context.SaveChanges();
}
var hash = PasswordHashProvider.ComputePasswordHash(model.Password, student.Salt);
if (student.Password != hash)
{
throw new LoginErrorException();
}
return(ComposeToken(model.Username, UserType.StudentUserType));
}
}
public bool CheckQrCode(int studentId, int classId, string qrCode)
{
using (var context = new AASDBContext())
{
var result = false;
var ticket = context.Tickets.SingleOrDefault(t => t.StudentId == studentId && t.ClassId == classId);
if (ticket != null)
{
result = ticket.Verify(qrCode);
if (result)
{
var classObj = context.Classes.Include("ClassSessions").FirstOrDefault(c => c.Id == classId);
var now = DateTime.Now;
var dateNow = new DateTime(now.Year, now.Month, now.Day, 0, 0, 0);
if (dateNow < classObj.StartDate || dateNow > classObj.EndDate)
{
return(false);
}
var currentWeekDay = dateNow.DayOfWeek.ToString().Substring(0, 3).ToLower();
var session = classObj.ClassSessions.FirstOrDefault(s => s.Weekday.ToLower() == currentWeekDay);
if (session != null)
{
var currentTime = new TimeSpan(now.Hour, now.Minute, now.Second);
var startTime = session.StartTime;
var endTime = (classObj.ExcusedTime != null) ? startTime + classObj.ExcusedTime.Value : session.EndTime;
if (session.StartTime > currentTime || session.EndTime < currentTime)
{
return(false);
}
var dateTimeOffsetNow = DateTimeOffset.Now;
var sessionId = session.Id;
var record = context.AttendanceRecords.FirstOrDefault(r => r.SessionId == sessionId &&
r.CheckinTime <= dateTimeOffsetNow);
if (record == null)
{
record = new AttendanceRecord
{
CheckinTime = dateTimeOffsetNow,
RecordDate = DateTime.Now,
SessionId = session.Id,
StudentId = studentId,
TicketId = ticket.Id
};
context.AttendanceRecords.Add(record);
context.SaveChanges();
}
}
else
{
return(false);
}
}
}
return(result);
}
}
public void DeleteAdmin(string username)
{
using (var context = new AASDBContext())
{
var admin = GetAdmin(username);
admin.Status = AdminStatus.Deleted;
context.SaveChanges();
}
}
public int AddClass(Class classObj)
{
using (var context = new AASDBContext())
{
context.Classes.Add(classObj);
context.SaveChanges();
return(classObj.Id);
}
}
public int AddStudent(Student student)
{
using (var context = new AASDBContext())
{
student.Status = StudentStatus.Active;
context.Students.Add(student);
context.SaveChanges();
return(student.Id);
}
}
public void UpdateClass(Class classObj)
{
using (var context = new AASDBContext())
{
if (!context.Classes.Any(c => c.Id == classObj.Id))
{
throw new NotFoundException();
}
var existing = context.Classes.Include("ClassSessions").Single(c => c.Id == classObj.Id);
existing.Name = classObj.Name;
existing.ProfessorName = classObj.ProfessorName;
existing.StartDate = classObj.StartDate;
existing.EndDate = classObj.EndDate;
existing.ExcusedTime = classObj.ExcusedTime;
var newSessionList = classObj.ClassSessions.ToList();
foreach (var session in existing.ClassSessions.ToArray())
{
var newSession = newSessionList.SingleOrDefault(s => s.Id == session.Id);
if (newSession != null)
{
session.EndTime = newSession.EndTime;
session.StartTime = newSession.StartTime;
session.Weekday = newSession.Weekday;
session.Room = newSession.Room;
newSessionList.Remove(newSession);
}
else
{
context.ClassSessions.Remove(session);
}
}
foreach (var newSession in newSessionList)
{
//This code cause "Multiplicity constraint violated" exception
//existing.ClassSessions.Add(newSession);
existing.ClassSessions.Add(new ClassSession
{
Class = existing,
ClassId = existing.Id,
EndTime = newSession.EndTime,
StartTime = newSession.StartTime,
Room = newSession.Room,
Weekday = newSession.Weekday
});
}
context.SaveChanges();
}
}
public void UpdateAdmin(Admin admin)
{
using (var context = new AASDBContext())
{
var existing = GetAdmin(admin.Username);
if (existing == null)
{
throw new NotFoundException();
}
existing.AdminName = admin.AdminName;
context.SaveChanges();
}
}
public void DeleteClass(int id)
{
using (var context = new AASDBContext())
{
var classObj = context.Classes.FirstOrDefault(c => c.Id == id);
if (classObj != null)
{
classObj.IsArchived = true;
context.SaveChanges();
}
else
{
throw new NotFoundException();
}
}
}
public void DropClass(int studentId, int classId)
{
using (var context = new AASDBContext())
{
var ticket = context.Tickets.SingleOrDefault(t => t.StudentId == studentId && t.ClassId == classId);
if (ticket != null)
{
var tid = ticket.Id;
var records = context.AttendanceRecords.Where(r => r.TicketId == tid);
foreach (var r in records)
{
context.AttendanceRecords.Remove(r);
}
context.Tickets.Remove(ticket);
context.SaveChanges();
}
}
}
public void AddAdmin(Admin admin)
{
using (var context = new AASDBContext())
{
admin.Status = AdminStatus.Active;
var userName = admin.Username;
var existing = context.Admins.Where(a => a.Status < AdminStatus.TrumCuoi)
.SingleOrDefault(a => a.Username == userName);
if (existing != null)
{
existing.AdminName = admin.AdminName;
existing.Status = admin.Status;
existing.Salt = admin.Salt;
existing.Password = admin.Password;
}
else
{
context.Admins.Add(admin);
}
context.SaveChanges();
}
}
public Ticket RegisterClass(int studentId, int classId)
{
using (var context = new AASDBContext())
{
var ticket = context.Tickets.SingleOrDefault(t => t.StudentId == studentId && t.ClassId == classId);
if (ticket != null)
{
return(ticket);
}
ticket = new Ticket
{
StudentId = studentId,
ClassId = classId
};
ticket.GenerateQrCode();
context.Tickets.Add(ticket);
context.SaveChanges();
return(ticket);
}
}