diff --git a/app/library/OAuth/Adapter/League.php b/app/library/OAuth/Adapter/League.php
index d1ebeb6..cf85b14 100644
--- a/app/library/OAuth/Adapter/League.php
+++ b/app/library/OAuth/Adapter/League.php
@@ -7,6 +7,16 @@ use League\OAuth2\Client\Provider\AbstractProvider,
 
 class League implements AdapterInterface
 {
+    /**
+     * List of all supported providers and their class name.
+     *
+     * @var array
+     */
+    protected $_providerClasses = array(
+        'github' => '\League\OAuth2\Client\Provider\Github',
+        'gitlab' => '\Omines\OAuth2\Client\Provider\Gitlab',
+    );
+
     /**
      * @var AbstractProvider
      */
@@ -17,15 +27,19 @@ class League implements AdapterInterface
      */
     protected $_accessToken;
 
+    protected $_options;
+
     /**
      * {@inheritDoc}
      * @throws Exception
      */
     public function __construct($provider_name, $options)
     {
-        $provider_name = ucfirst($provider_name);
+        if (!array_key_exists($provider_name, $this->_providerClasses)) {
+            throw new Exception("Provider '{$provider_name}' is not supported.");
+        }
 
-        $className = 'League\OAuth2\Client\Provider\\' . $provider_name;
+        $className = $this->_providerClasses[$provider_name];
         $provider = new $className($options);
 
         if (!($provider instanceof AbstractProvider)) {
@@ -34,6 +48,7 @@ class League implements AdapterInterface
         }
 
         $this->_provider = $provider;
+        $this->_options = $options;
     }
 
     /**
@@ -49,7 +64,7 @@ class League implements AdapterInterface
      */
     public function getAuthorizationUrl()
     {
-        return $this->_provider->getAuthorizationUrl();
+        return $this->_provider->getAuthorizationUrl($this->_options);
     }
 
     /**