<?php
// inspired by https://www.mailgun.com/blog/email/double-opt-in-with-php-mailgun/

require(dirname(__FILE__) . '/settings.php');

$successURL = '/newsletter/success.html';
$errorURL = '/newsletter/error.html';
$err = 'Anmeldung fehlgeschlagen';

// check if email parameter is set
if ( ! isset($_POST['email']) ) {
  GracefulExit($errorURL, "{$err}: Keine Emailadresse angegeben.");
}

// check if it's a well-formed email address 
$email = filter_var(trim($_POST['email'], FILTER_SANITIZE_STRING));
if ( ! filter_var($email, FILTER_VALIDATE_EMAIL)) { 
  GracefulExit($errorURL, "{$err}: Ungültige Emailadresse {$email}");
}

// check whether address is already subscribed
try {
  $check = NotAlreadySubscribed($email);
  if ( gettype($check) == 'string' ) {
    GracefulExit($errorURL, "{$err}: {$check}.");
  }
} catch (\PDOException $e) {
  GracefulExit($errorURL, "{$err}: {$e->getMessage()}");
}

// send email with confirmation link
$confirmQuery = http_build_query(['c' => GetConfirmationHash($email), 'e' => $email]);
$confirmLink = $general['siteURL'] . $general['confirmScript'] . "?" . $confirmQuery;
try {
  SendEmail($email, $mailConfirmation, $confirmLink);
} catch (Exception $e) {
  GracefulExit($errorURL, "{$err}: {$e->getMessage()}"); 
}

// success
GracefulExit($successURL, "Anmeldung erfolgreich: Email mit Bestätigungslink wurde an {$email} versandt.");
?>