unsubscribe forever simplenews

I don't know how to do a patch. I'm sorry.

I have customized simplenews.module to blocking forever unsubscribed emails for legal reasons.

It creates a blocked user with mail=$mail and name=$mai when unsubscribe a user only if doesn't exist user.

When subscribe email (via mass or via subscription in my newsletter) if blocked user with this email exists it doesn't subscribe it.

/**
 * Subscribe a user to a newsletter or send a confirmation mail.
 *
 * The $confirm parameter determines the action:
 *   FALSE = The user is subscribed
 *   TRUE  = User receives an email to verify the address and complete the subscription
 * A new subscription account is created when the user is subscribed to the first newsletter
 *
 * @param string $mail
 *   The email address to subscribe to the newsletter.
 * @param integer $tid
 *   The term ID of the newsletter.
 * @param boolean $confirm
 *   TRUE = send confirmation mail; FALSE = subscribe immediate to the newsletter
 * @param string $preferred_language
 *   The language code (i.e. 'en', 'nl') of the user preferred language.
 *   Use '' for the site default language.
 *   Use NULL for the language of the current page.
 */
function simplenews_subscribe_user($mail, $tid, $confirm = TRUE, $preferred_language = NULL) {
  global $language;

  //Prevent mismatches from accidental capitals in mail address
  $mail = strtolower($mail);

  // Get current subscriptions if any.
  $account = (object) array('mail' => $mail);
  $subscription = simplenews_get_subscription($account);

  // If user is not subscribed to ANY newsletter, create a subscription account
  if ($subscription->snid == 0) {
    // To subscribe a user:
    //   - Fetch the users uid.
    //   - Determine the user preferred language.
    //   - Add the user to the database.
    //   - Get the full subscription object based on the mail address.
    // Note that step 3 gets subscription data based on mail address because the uid can be 0 (for anonymous users)
    $account = _simplenews_user_load($mail);

    // If the site is multilingual:
    //  - Anonymous users are subscribed with their preferred language
    //    equal to the language of the current page.
    //  - Registered users will be subscribed with their default language as
    //    set in their account settings.
    // By default the preferred language is not set.
    if (variable_get('language_count', 1) > 1) {
      if ($account->uid) {
        $preferred_language = $account->language;
      }
      else {
        $preferred_language = isset($preferred_language) ? $preferred_language : $language->language;
      }
    }
    
    $existeix_user = db_result(db_query("SELECT COUNT(*) FROM {users} WHERE mail = '$mail' AND status=0"));
       if($existeix_user)
   {
   //si esta bloquejat no fa res
   }else
   {

    db_query("INSERT INTO {simplenews_subscriptions} (mail, uid, language, activated) VALUES ('%s', %d, '%s', %d)", $mail, $account->uid, $preferred_language, 1);
    $subscription = simplenews_get_subscription($account);
   }
  }

  if ($confirm) {
    // Send confirmation email to user to complete subscription or to tell
    // them that he or she is already subscribed.
    // Confirmation mail is in the user preferred language which is by default the language_default().
    $params['from'] = _simplenews_set_from();
    $params['context']['newsletter'] = taxonomy_get_term($tid);
    $params['context']['account'] = $subscription;
    drupal_mail('simplenews', 'subscribe', $mail, $subscription->language, $params, $params['from']['address']);
  }
  elseif (!isset($subscription->tids[$tid])) {
    // OR add user to newsletter relationship if not already subscribed.
    db_query("INSERT INTO {simplenews_snid_tid} (snid, tid) VALUES (%d, %d)", $subscription->snid, $tid);

    // Execute simplenews subscribe trigger.
    simplenews_call_actions('subscribe', $subscription);
  }
  return TRUE;
}

/**
 * Unsubscribe a user from a newsletter or send a confirmation mail.
 *
 * The $confirm parameter determines the action:
 *   FALSE = The user is unsubscribed
 *   TRUE  = User receives an email to verify the address and complete the unsubscription
 * The subscription account is deleted when the user is unsubscribed to the last newsletter
 *
 * @param string $mail The email address to unsubscribe from the newsletter.
 * @param integer $tid The term ID of the newsletter.
 * @param boolean $confirm TRUE = send confirmation mail; FALSE = unsubscribe immediate from the newsletter
 */
function simplenews_unsubscribe_user($mail, $tid, $confirm = TRUE) {
  //Prevent mismatches from accidental capitals in mail address
  $mail = strtolower($mail);

  $account = (object) array('mail' => $mail);
  $subscription = simplenews_get_subscription($account);

  // The unlikely case that a user is subscribed from a non existing newsletter is logged
  if (!$newsletter = taxonomy_get_term($tid)) {
    watchdog('simplenews', 'Attempt to unsubscribe from non existing newsletter term ID %id', array('%id' => $tid), WATCHDOG_ERROR);
    return FALSE;
  }

  if ($confirm) {
    // Send confirmation email to user to complete unsubscription
    // or to tell them that he or she is not subscribed
    // Confirmation mail is in the user preferred language.
    $params['from'] = _simplenews_set_from();
    $params['context']['newsletter'] = $newsletter;
    $params['context']['account'] = $subscription;
    drupal_mail('simplenews', 'unsubscribe', $mail, $subscription->language, $params, $params['from']['address']);
  }
  elseif (isset($subscription->tids[$tid])) {
    // OR remove the user from the newsletter.
    db_query('DELETE FROM {simplenews_snid_tid} WHERE snid = %d AND tid = %d', $subscription->snid, $tid);

    // Clean up subscription account if user is not subscribed to any newsletter anymore
    if (!db_result(db_query("SELECT COUNT(*) FROM {simplenews_snid_tid} t WHERE t.snid = %d", $subscription->snid))) {
      db_query('DELETE FROM {simplenews_subscriptions} WHERE snid = %d', $subscription->snid);
    }

    // Execute simplenews unsubscribe trigger
    simplenews_call_actions('unsubscribe', $subscription);
    }
    
    //en tots els casos inserim un usuari blockejat amb aquesta adreça per evitar subscripcions futures
    
   $existeix_user = db_result(db_query("SELECT COUNT(*) FROM {users} WHERE mail = '$mail'"));
   if($existeix_user)
   {
   //db_query("UPDATE {users}  SET status=0 WHERE mail = '$mail'" );
   }else
   {
    db_query("INSERT INTO {users}  (  name  , mail , status ) VALUES ( '$mail', '$mail', 0)" );
   } 
  return TRUE;
}