<?php

require_once dirname(__FILE__)."/config/config.php";

function check_auth() {
  global $oauth_id, $oauth_secret, $oauth_callback;

  if (isset($_SESSION['allowed_admin']) && $_SESSION['allowed_admin'] == true) {
    if (isset($_GET['logout']) && $_GET['logout'] == '1') {
      unset($_SESSION['allowed_admin']);
    }
    else if (isset($_SESSION['origin_url'])) {
      header('Location: '.$_SESSION['origin_url']);
      unset($_SESSION['origin_url']);
      exit;
    }
    else return;
  }

  $provider = new Stevenmaguire\OAuth2\Client\Provider\Bitbucket([
      'clientId'          => $oauth_id,
      'clientSecret'      => $oauth_secret,
      'redirectUri'       => $oauth_callback
  ]);


  if (!isset($_GET['code'])) {

      $_SESSION['origin_url'] = $_SERVER['REQUEST_URI'];

      if (isset($_GET['o'])) {
         $_SESSION['origin_url'] = urldecode($_GET['o']);
      }

      // If we don't have an authorization code then get one
      $authUrl = $provider->getAuthorizationUrl();
      $_SESSION['oauth2state'] = $provider->getState();
      header('Location: '.$authUrl);
      exit;

  // Check given state against previously stored one to mitigate CSRF attack
  } elseif (empty($_GET['state']) || ($_GET['state'] !== $_SESSION['oauth2state'])) {

      unset($_SESSION['oauth2state']);
      exit('Invalid state');

  } else {

        // Try to get an access token (using the authorization code grant)
      $token = $provider->getAccessToken('authorization_code', [
          'code' => $_GET['code']
      ]);
      $_SESSION["web-key"] = $token;

      // Optional: Now you have a token you can look up a users profile data
      try {

          // We got an access token, let's now get the user's details
          $user = $provider->getResourceOwner($token);

          if ($user->getUsername() != "glavaux") {
            $_SESSION["allowed_admin"] = false;
            exit('Invalid user');
          }
          $_SESSION["allowed_admin"] = true;

          // Use these details to create a new profile
  //        printf('Hello %s!', $user->getUsername());
          if (isset($_SESSION['origin_url']) && !empty($_SESSION['origin_url'])) {
            header('Location: '.$_SESSION['origin_url']);
            unset($_SESSION['origin_url']);
            exit;
          }

      } catch (Exception $e) {

          // Failed to get user details
          exit('Oh dear...');
      }

      // Use this to interact with an API on the users behalf
  //    echo $token->getToken();
  }

}

check_auth();