/* Main email function/controller.
* Most of the following code was superficially tested (interface flow only) because OAuth wasn't implemented (it requires additional website integration, which is outside the scope of this project).
* The provided email credentials will act as sender and send a copy of the email statement to the receiver, which is the email specified in the account statement. This prevents the need to bake in plaintext account details, which is a major security issue.
* Mailkit was not used because it requires OAuth for Gmail. Sendgrid could be a viable alternative (commercial email API) if a project website with separate domain was set up. */
private void viewEmailStatement(User user, Account account)
{
string header = "Email bank statement";
string[] auth = new string[2];
string _origin = "";
string _password = "";
try
{
auth = loopEmail(account, header); // Looping form to obtain email credentials from user. Used for sending.
_origin = auth[0];
_password = auth[1];
}
catch (Exception)
{ // Catch null return
viewMainMenu(user);
}
string recipient = account.FirstName + " " + account.LastName;
string subject = "SimpleBankingApp - Bank Statement for " + account.AccountNumber;
string body = account.emailOutput(fe);
string[] outgoingServerList =
{
"smtp.gmail.com", // Gmail smtp server
"smtp.live.com", // Hotmail smtp server
"smtp-mail.outlook.com",
};
string smtp = "";
int smtpType = validator.validateEmailType(_origin);
switch (smtpType)
{
case 0: smtp = outgoingServerList[0]; break;
case 1: smtp = outgoingServerList[1]; break;
case 2: smtp = outgoingServerList[2]; break;
}
;
try
{
MailMessage email = new MailMessage(_origin, account.Email)
{
From = new MailAddress(account.Email),
Subject = subject,
Body = body,
IsBodyHtml = false,
};
var client = new SmtpClient(smtp)
{
Port = 587, // General port for TLS email connections
Credentials = new NetworkCredential(_origin, _password),
EnableSsl = true,
};
client.Send(email);
display.interfaceHeader(header);
display.interfaceMessage("success", "Please check the inbox of " + account.Email + "for a copy of the statement.");
}
catch (System.Net.Mail.SmtpException snmse)
{
fe.log(snmse.ToString(), snmse.StackTrace);
display.interfaceHeader(header);
display.interfaceMessage("error", "Failed to authenticate using your credentials. You may have typed in a wrong password or need an app-specific password to continue. For Gmail users, please check this answer: https://stackoverflow.com/a/26709761");
}
catch (Exception e)
{
fe.log(e.ToString(), e.StackTrace);
try
{
if (smtpType == 2)
{ // Alternative method for Outlook
MailMessage email = new MailMessage(_origin, account.Email)
{
From = new MailAddress(account.Email),
Subject = subject,
Body = body,
IsBodyHtml = false,
};
smtp = outgoingServerList[3]; // Switch to smtp.office365.com
var client = new SmtpClient(smtp)
{
Port = 587,
Credentials = new NetworkCredential(_origin, _password),
EnableSsl = true,
};
client.Send(email);
display.interfaceHeader(header);
display.interfaceMessage("success", "Please check the inbox of " + account.Email + "for a copy of the statement.");
}
else
{
display.interfaceHeader(header);
display.interfaceMessage("error", "An error occurred while emailing. Refer to the error log for more details.");
}
}
catch (System.Net.Mail.SmtpException snmse)
{
fe.log(snmse.ToString(), snmse.StackTrace);
display.interfaceHeader(header);
display.interfaceMessage("error", "Failed to authenticate using your provided credentials. You may have typed in a wrong password or need an app-specific password to continue. For Gmail users, please check this answer: https://stackoverflow.com/a/26709761");
}
catch (Exception f)
{
fe.log(f.ToString(), f.StackTrace);
display.interfaceHeader(header);
display.interfaceMessage("error", "An error occurred while emailing. Refer to the error log for more details.");
}
}
}