Authentik: add refreshToken method (#1081)

Co-authored-by: Lucas Michot <lucas@semalead.com>
Co-authored-by: atymic <atymicq@gmail.com>

Author: 3 people

Provider.php

@@ -55,18 +55,30 @@ protected function getTokenUrl()
      */
     protected function getUserByToken($token)
     {
-        $response = $this->getHttpClient()->get(
-            $this->getBaseUrl().'/application/o/userinfo/',
-            [
-                RequestOptions::HEADERS => [
-                    'Authorization' => 'Bearer '.$token,
-                ],
-            ]
-        );
+        $response = $this->getHttpClient()->get($this->getBaseUrl().'/application/o/userinfo/', [
+            RequestOptions::HEADERS => [
+                'Authorization' => 'Bearer '.$token,
+            ],
+        ]);
 
         return json_decode((string) $response->getBody(), true);
     }
 
+    /**
+     * {@inheritdoc}
+     */
+    protected function refreshToken($refreshToken)
+    {
+        return $this->getHttpClient()->post($this->getTokenUrl(), [
+            RequestOptions::FORM_PARAMS => [
+                'client_id'     => $this->clientId,
+                'client_secret' => $this->clientSecret,
+                'grant_type'    => 'refresh_token',
+                'refresh_token' => $refreshToken,
+            ],
+        ]);
+    }
+
     /**
      * {@inheritdoc}
      */