static void Main(string[] args)
{
while (true)
{
CalendarContext db = new CalendarContext();
Console.Clear();
Console.WriteLine("Hi and Welcome to the Calendar-Planner Application!");
Console.WriteLine();
Console.WriteLine("Proceed by typing the corresponding number then");
Console.WriteLine("press enter to execute the action:");
Console.WriteLine("1: Log in to your account.");
Console.WriteLine("2: Create new user.");
Console.WriteLine("3: Remove existing user.");
Console.WriteLine();
Console.WriteLine("4: Close the application");
string response = Console.ReadLine();
if (response == "1")
{
PlannerMenu(ref db, UserLogin(ref db));
}
else if (response == "2")
{
PlannerMenu(ref db, UserCreation(ref db));
}
else if (response == "3")
{
UserDeletion(ref db);
}
else if (response == "4")
{
Environment.Exit(0);
}
}
}
public static void UserRemove(ref CalendarContext db, string userName, string hashedPassword)
{
try
{
db.Users.Remove(new User
{
Username = userName,
Password = hashedPassword,
});
db.SaveChanges();
db.Calendars.Remove(new Calendar
{
CalendarId = db.GetCalendarId(userName)
});
db.SaveChanges();
}
catch (DbUpdateException)
{
Console.WriteLine("Username not found!");
Console.WriteLine("Press enter to try again.");
Console.ReadLine();
db.DetachAllEntities();
UserDeletion(ref db);
}
}
public static void PlanAdd(ref CalendarContext db, string userName)
{
bool add = true;
while (add)
{
Console.Clear();
Console.WriteLine("What are you planning to do?");
string activity = Console.ReadLine();
Console.WriteLine("Which date and time does it start?(dd/mm/yy hh:mm)");
string startTime = Console.ReadLine();
ValidateAddDateFormat(ref db, startTime, userName);
Console.WriteLine("Until which date and time does it last?(dd/mm/yy hh:mm)");
string endTime = Console.ReadLine();
ValidateAddDateFormat(ref db, endTime, userName);
db.AddPlanEntry(startTime, endTime, activity, userName);
Console.WriteLine("Are you done adding plans?(y/n)");
string response = Console.ReadLine();
if (response == "n")
{
add = true;
Console.Clear();
}
else if (response == "y")
{
add = false;
}
}
}
public static void UserGetHashedPassword(ref CalendarContext db, string userName, string passWord)
{
UserAuthentication(ref db, userName, passWord);
string savedPasswordHash = db.Users.Where(u => u.Username == userName)
.SingleOrDefault().Password;
byte[] hashBytes = Convert.FromBase64String(savedPasswordHash);
byte[] salt = new byte[16];
Array.Copy(hashBytes, 0, salt, 0, 16);
var pbkdf2 = new Rfc2898DeriveBytes(passWord, salt, 10000);
ConvertToHashedPassword(ref db, passWord, salt);
byte[] hash = pbkdf2.GetBytes(20);
for (int i = 0; i < 20; i++)
{
if (hashBytes[i + 16] == hash[i])
{
UserAuthentication(ref db, userName, passWord);
}
else if (hashBytes[i + 16] != hash[i])
{
Console.WriteLine("Password is incorrect!");
Console.WriteLine("Press enter to try again.");
Console.ReadLine();
UserLogin(ref db);
break;
}
}
}
public static string UserCreation(ref CalendarContext db)
{
bool passwordConfirmation = true;
while (passwordConfirmation)
{
Console.Clear();
Console.WriteLine("Please enter your desired username:"******"Please enter your desired password:"******"Please confirm your desired password:"******"The password was not confirmed!");
Console.WriteLine("Press enter to try again.");
Console.ReadLine();
UserCreation(ref db);
}
}
return(null);
}
public static void PlanRemove(ref CalendarContext db, string userName)
{
bool remove = true;
while (remove)
{
Console.Clear();
Console.WriteLine("When is the plan you would like to remove?");
string removeDate = Console.ReadLine();
Console.WriteLine("Which plan would you like to remove?");
string activity = Console.ReadLine();
ValidateRemoveDateFormat(ref db, removeDate, activity, userName);
db.RemovePlanEntry(removeDate, activity, userName);
db.SaveChanges();
Console.WriteLine("Are you done removing plans?(y/n)");
string response = Console.ReadLine();
if (response == "n")
{
remove = true;
Console.Clear();
}
else if (response == "y")
{
remove = false;
}
}
}
public static string UserLogin(ref CalendarContext db)
{
Console.Clear();
Console.WriteLine("Welcome! Please enter your username:"******"Please enter your password:");
string passWord = UserPasswordMasking();
UserGetHashedPassword(ref db, userName, passWord);
return(userName);
}
public static void ValidateAddDateFormat(ref CalendarContext db, string date, string userName)
{
bool addDateFormat = true;
addDateFormat &= DateTime.TryParse(date, out DateTime result);
if (!addDateFormat)
{
Console.WriteLine("This is not a valid date format, try again.");
Console.ReadLine();
PlanAdd(ref db, userName);
}
}
public static void ConvertToHashedPassword(ref CalendarContext db, string passWord, byte[] salt)
{
try
{
var pbkdf2 = new Rfc2898DeriveBytes(passWord, salt, 10000);
}
catch (Exception)
{
Console.WriteLine("Password is incorrect!");
Console.WriteLine("Press enter to try again.");
Console.ReadLine();
UserLogin(ref db);
}
}
public static void ValidateRemoveDateFormat(ref CalendarContext db, string date, string activity, string userName)
{
bool removeDateFormat = true;
bool planActivity = true;
removeDateFormat &= DateTime.TryParse(date, out DateTime result);
planActivity &= db.Plans.Any(x => x.Activity.ToUpper() == activity.ToUpper());
if (!removeDateFormat)
{
Console.WriteLine("This is not a valid date format, try again.");
Console.ReadLine();
PlanRemove(ref db, userName);
}
else if (!planActivity)
{
Console.WriteLine("There is no such activity planned, try again.");
Console.ReadLine();
PlanRemove(ref db, userName);
}
}
public static void UserAdd(ref CalendarContext db, string userName, string hashedPassword)
{
try
{
db.Users.Add(new User {
Username = userName,
Password = hashedPassword,
Calendar = new Calendar {
Username = userName
}
});
db.SaveChanges();
}
catch (DbUpdateException)
{
Console.WriteLine("Username already taken!");
Console.WriteLine("Press enter to try again.");
Console.ReadLine();
db.DetachAllEntities();
UserCreation(ref db);
}
}
public static void UserDeletion(ref CalendarContext db)
{
bool passwordConfirmation = true;
while (passwordConfirmation)
{
Console.Clear();
Console.WriteLine("Please enter your username:"******"Please enter your password:"******"Please confirm your password:"******"This action will delete your account");
Console.WriteLine("Would you like to proceed? (y/n)");
string response = Console.ReadLine();
if (response == "y")
{
string hashedPassword = UserPasswordHashing(passWordConfirm);
UserRemove(ref db, userName, hashedPassword);
break;
}
else if (response == "n")
{
break;
}
}
else if (passWord != passWordConfirm)
{
Console.WriteLine("The password was not confirmed!");
Console.WriteLine("Press enter to try again.");
Console.ReadLine();
passwordConfirmation = true;
}
}
}
public static void UserAuthentication(ref CalendarContext db, string userName, string passWord)
{
try
{
string existingUser = db.Users.Single(u => u.Username == userName).ToString();
}
catch (InvalidOperationException)
{
Console.WriteLine("User does not exist!");
Console.WriteLine("Press enter to try again.");
Console.ReadLine();
UserLogin(ref db);
}
catch (NullReferenceException)
{
Console.WriteLine("User does not exist!");
Console.WriteLine("Press enter to try again.");
Console.ReadLine();
UserLogin(ref db);
}
string savedPasswordHash = db.Users.Where(u => u.Username == userName)
.SingleOrDefault().Password;
}
public static void PlannerMenu(ref CalendarContext db, string userName)
{
while (true)
{
Console.Clear();
Console.WriteLine("What would you like to do?");
Console.WriteLine("Type the corresponding number then press enter to execute:");
Console.WriteLine("1: Add Plans.");
Console.WriteLine("2: Remove Plans.");
Console.WriteLine("3: Display your existing calendar-planner.");
Console.WriteLine("4: Log out.");
Console.WriteLine();
Console.WriteLine("5: Close the application.");
string response = Console.ReadLine();
if (response == "1")
{
PlanAdd(ref db, userName);
}
else if (response == "2")
{
PlanRemove(ref db, userName);
}
else if (response == "3")
{
db.DisplayPlans(userName);
}
else if (response == "4")
{
break;
}
else if (response == "5")
{
Environment.Exit(0);
}
}
}