fix: missing keycloak_openid during refresh (#431)

Error occurs when token is set so refresh_token is called before call
to get_token.

src/keycloak/openid_connection.py

@@ -54,6 +54,7 @@ class KeycloakOpenIDConnection(ConnectionManager):
     _custom_headers = None
     _user_realm_name = None
     _expires_at = None
+    _keycloak_openid = None
 
     def __init__(
         self,
@@ -275,11 +276,16 @@ class KeycloakOpenIDConnection(ConnectionManager):
             # merge custom headers to main headers
             self.headers.update(self.custom_headers)
 
-    def get_token(self):
-        """Get admin token.
+    @property
+    def keycloak_openid(self) -> KeycloakOpenID:
+        """Get the KeycloakOpenID object.
 
-        The admin token is then set in the `token` attribute.
+        The KeycloakOpenID is used to refresh tokens
+
+        :returns: KeycloakOpenID
+        :rtype: KeycloakOpenID
         """
+        if self._keycloak_openid is None:
             if self.user_realm_name:
                 token_realm_name = self.user_realm_name
             elif self.realm_name:
@@ -287,7 +293,7 @@ class KeycloakOpenIDConnection(ConnectionManager):
             else:
                 token_realm_name = "master"
 
-        self.keycloak_openid = KeycloakOpenID(
+            self._keycloak_openid = KeycloakOpenID(
                 server_url=self.server_url,
                 client_id=self.client_id,
                 realm_name=token_realm_name,
@@ -296,6 +302,13 @@ class KeycloakOpenIDConnection(ConnectionManager):
                 timeout=self.timeout,
             )
 
+        return self._keycloak_openid
+
+    def get_token(self):
+        """Get admin token.
+
+        The admin token is then set in the `token` attribute.
+        """
         grant_type = []
         if self.client_secret_key:
             grant_type.append("client_credentials")