Magento: Detect if admin is logged in in frontend pages

Question

I have created a magento extension. I want to implement access to the extension. The extension creates a page in frontend and i want only admin to access that page. So basically

Answer 1

Christoph Peters posted a link which solved my problem (Detect if admin is logged in in frontend pages):

//check if adminhtml cookie is set
if(array_key_exists('adminhtml', $_COOKIE)){
   //get session path and add dir seperator and content field of cookie as data name with magento "sess_" prefix
   $sessionFilePath = Mage::getBaseDir('session').DS.'sess_'.$_COOKIE['adminhtml'];
   //write content of file in var
   $sessionFile = file_get_contents($sessionFilePath);

   //save old session
   $oldSession = $_SESSION;
   //decode adminhtml session
   session_decode($sessionFile);
   //save session data from $_SESSION
   $adminSessionData = $_SESSION;
   //set old session back to current session
   $_SESSION = $oldSession;

   if(array_key_exists('user', $adminSessionData['admin'])){
      //save Mage_Admin_Model_User object in var
      $adminUserObj = $adminSessionData['admin']['user'];
      echo 'ADMIN USER IS LOGGED IN';
   }
   else
   {
      echo 'ADMIN USER IS NOT LOGGED IN'
   }
}

Thank you very much Christoph Peters!