// checks hte checksum of the current file to database file
public bool verifyCheckSum(byte[] checksum, int userid)
{
//create dataset and table adapter objects
edproj1 ed = new edproj1();
edproj1TableAdapters.EncryptedTableAdapter uAdapter =
new edproj1TableAdapters.EncryptedTableAdapter();
// get info from table adaptors
uAdapter.Fill(ed.Encrypted);
// datarow for encrypted
DataRow[] dr = ed.Encrypted.Select();
bool result = false;
if (checksum == (byte[])dr[userid]["FileHash"])
{
result = true;
}
return(result);
}
/// <summary>
/// When the user presses this button, a copy of the User table is made and each entry is
/// retrieved and placed in a datarow[]. The inputted username and password are compared
/// to each entry in the table to check if the username is unique. If it is then a message
/// is displayed to the user and the table is updated with the new account info.
/// </summary>
private void btnSignUp_Click(object sender, EventArgs e)
{
//new user object will store the inputted username and password
//the values will be compared to the table records
User user = new User();
user.UserName = txtName.Text;
user.Password = txtPass.Text;
user.Email = txtEmail.Text;//can be null
bool result = false;
//there must be a username and password for you to register
if (user.UserName == "" || user.Password == "")
{
MessageBox.Show("No empty boxes", "Error!", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
else
{
//dataset and table adapter for connecting, retrieving, and updating from database
edproj1 ed = new edproj1();
edproj1TableAdapters.UserTableAdapter uAdapter =
new edproj1TableAdapters.UserTableAdapter();
//get info from table adaptors
uAdapter.Fill(ed.User);
//dr contains all record from table (select * from user)
DataRow[] dr = ed.User.Select();
//loop through each record in the table and compare the usernames and passwords
//to the user object's attributes
for (int i = 0; i < dr.Length; i++)
{
string dbUser = (string)dr[i]["Name"];
string dbPass = (string)dr[i]["Password"];
//if true is returned, then the given username is in the table already
//and not available, else it is and registration proceeds
if (user.UserName == dbUser)
{
result = false;
break;
}
else
{
result = true;
}
}
// validate email
try
{
MailAddress m = new MailAddress(user.Email);
}
catch (FormatException)
{
MessageBox.Show("Invalid email!", "Error"
, MessageBoxButtons.OK, MessageBoxIcon.Information);
return;
}
//if there is a match with usernames then an error is returned and user prompted again
//if no match ie. the username is unique then it gets added to the user table
//user is then sent back to the login and can try to login with their new account
if (result == false)
{
MessageBox.Show("Username taken, please try a different one", "Error"
, MessageBoxButtons.OK, MessageBoxIcon.Information);
}
else
{
//uRow contains new user info and will be used to update the real database
edproj1.UserRow uRow = ed.User.NewUserRow();
uRow.Name = user.UserName;
uRow.Password = user.Password;
uRow.Email = user.Email;
//add new row to the local cache
ed.User.Rows.Add(uRow);
//update the real database with the new row
uAdapter.Update(ed.User);
MessageBox.Show("Registration Successful", "Success"
, MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
}
}
}
/// <summary>
/// authenticates the user and allows access to the rest of the application
/// </summary>
private void btnLogin_Click(object sender, EventArgs e)
{
User user = new User();
user.UserName = txtUsername.Text;
user.Password = txtPassword.Text;
bool result = false;
if (user.UserName == "" || user.Password == "")
{
MessageBox.Show("No empty boxes", "Error!", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
//create dataset and table adapter objects
edproj1 ed = new edproj1();
edproj1TableAdapters.UserTableAdapter uAdapter =
new edproj1TableAdapters.UserTableAdapter();
//get info from table adaptors
uAdapter.Fill(ed.User);
DataRow[] dr = ed.User.Select();
int userid = 0;
//compare given username and password to every entry in the table
for (int i = 0; i < dr.Length; i++)
{
string dbUser = (string)dr[i]["Name"];
string dbPass = (string)dr[i]["Password"];
//compare the given username and password with the records in the table
if (user.validate(dbUser, dbPass))
{
result = true;
userid = i;
break;
}
else
{
result = false;
}
}
//if there is a match the validate method will return true and login is successful
//otherwise there is no match and the user will be asked to enter again
if (result)
{
MessageBox.Show("Login SuccessFul", "Success!"
, MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
//transfer to next web form
Form1 f = new Form1(userid);
this.Hide();
f.ShowDialog();
}
else
{
MessageBox.Show("Login failed, check your username and password and try again", "Access Denied"
, MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}
