Restrict attributes to only those required and display notice on errors

index.php

@@ -14,7 +14,7 @@ if (!$auth->isLoggedIn()) {
     exit;
 }
 
-echo '<h1>Upload a file containing NUIDs</h1>
+echo '<h1>Upload a file containing NUIDs or My.UNL Usernames</h1>
     <form action="" method="post" enctype="multipart/form-data">
         File <input type="file" name="userfile" />
         <input type="submit" name="submit" />
@@ -34,12 +34,21 @@ $ldap = UNL_LDAP::getConnection($options);
 echo '<pre>';
 foreach ($contents as $nuid) {
     $nuid = rtrim($nuid);
-    if ($results = $ldap->search('dc=unl,dc=edu', '(|(unlUNCWID='.$nuid.')(uid='.$nuid.'))')) {
+    if ($results = $ldap->search(
+            'dc=unl,dc=edu',
+            '(|(unlUNCWID='.$nuid.')(uid='.$nuid.'))', 
+            array('attributes' => array('unlUNCWID', 'uid'))
+            )) {
         if (!count($results)) {
             continue;
         }
         foreach ($results as $entry) {
+            if (!isset($entry->unlUNCWID)) {
+                throw new Exception('Error, '.$entry->uid->__toString().' is not a student.');
+            }
             echo $entry->unlUNCWID->__toString() . ',' . $entry->uid->__toString().PHP_EOL;
         }
     }
 }
+echo '</pre>';
+