Moved, renamed and modified Telegram related files.

- Made functions from ./telegram.php into a class and moved to
  classes/telegram.php

- Renamed check.php to telegram_check.php to make it easier to
  understand what the file belongs to.

- SESSIONS used to control if user is logged on or not

- Telegram users will be identified as typeID = 2 in the
  subscribers table.

telegram_check.php

@@ -0,0 +1,33 @@
+<?php
+require_once ("config.php");
+require_once ("classes/telegram.php");
+require_once ("classes/subscriber.php");
+
+$telegram   = new Telegram();
+$subscriber = new Subscriber();
+
+try {
+    $auth_data = $telegram->checkTelegramAuthorization($_GET);
+    $telegram->saveTelegramUserData($auth_data);
+} catch (Exception $e) {
+    die($e->getMessage());
+}
+
+// Check if user is registered in DB
+$subscriber->firstname = $auth_data['first_name'];
+$subscriber->lastname  = $auth_data['last_name'];
+$subscriber->typeID    = 1;
+$subscriber->userID    = $auth_data['id'];
+$subscriber->active    = 1; // Telegram user should always be active if they can be validated
+
+$subscriber_id  = $subscriber->get_subscriber_by_userid(true); // If user does not exists, create it
+$subscriber->id = $subscriber_id;
+
+// make sure we don't have a logged in email subscriber
+$subscriber->set_logged_in();
+//$_SESSION['subscriber_valid'] = true;
+//$_SESSION['subscriber_typeid'] = 1;
+//$_SESSION['subscriber_userid'] = $auth_data['id'];
+//$_SESSION['subscriber_id'] = $subscriber_id;
+
+header('Location: subscriptions.php');