corrected domain prefix, added cookie removal logic, #290

Code_Igniter/application/libraries/Meta.php

@@ -24,8 +24,12 @@ public function __construct()
     public function setMeta($username = NULL) {
 
         log_message('debug', 'setting meta with username:'.$username);
-        if ($username && !$this->getCookie('uid')) {
+        if ($username) {
+            // always re-set this value
             $this->setCookie( 'uid', $this->domain.':'.$username);
+        } else {
+            // but remove it if no username is stored in current session
+            $this->removeCookie ('uid');
         }
 
         if (!$this->getCookie('deviceid')) {
@@ -55,6 +59,16 @@ private function getCookie($name)
     {
         return $this->CI->input->cookie($this->cookie_prefix . $name, TRUE);
     }
+    private function removeCookie($name)
+    {
+        return $this->CI->input->set_cookie(
+            array(
+                'name'   => $this->cookie_prefix . $name,
+                'value'  => '',
+                'expire' => 0
+            )
+        );
+    }
 
     private function generate_deviceid()
     {
@@ -65,7 +79,8 @@ private function generate_deviceid()
     private function get_domain() 
     {
         $base_url = base_url();
-        return substr( $base_url, strpos($base_url, '://') + 3 );
+        $domain = substr( $base_url, strpos($base_url, '://') + 3 );
+        return (strrpos($domain, '/') === strlen($domain) - 1) ? substr($domain, 0, -1) : $domain;
     }
 }