Save incoming cookie changes

libgm/client.go

@@ -223,7 +223,11 @@ func (c *Client) FetchConfig() (*gmproto.Config, error) {
 	req.Header.Del("origin")
 	c.AddCookieHeaders(req)
 
-	config, err := typedHTTPResponse[*gmproto.Config](c.http.Do(req))
+	resp, err := c.http.Do(req)
+	if resp != nil {
+		c.HandleCookieUpdates(resp)
+	}
+	config, err := typedHTTPResponse[*gmproto.Config](resp, err)
 	if err != nil {
 		return nil, err
 	}

libgm/http.go

@@ -48,6 +48,7 @@ func (c *Client) makeProtobufHTTPRequest(url string, data proto.Message, content
 	if reqErr != nil {
 		return res, reqErr
 	}
+	c.HandleCookieUpdates(res)
 	return res, nil
 }
 
@@ -64,6 +65,15 @@ func (c *Client) AddCookieHeaders(req *http.Request) {
 	}
 }
 
+func (c *Client) HandleCookieUpdates(resp *http.Response) {
+	if c.AuthData.Cookies == nil {
+		return
+	}
+	for _, cookie := range resp.Cookies() {
+		c.AuthData.Cookies[cookie.Name] = cookie.Value
+	}
+}
+
 func sapisidHash(origin, sapisid string) string {
 	ts := time.Now().Unix()
 	hash := sha1.Sum([]byte(fmt.Sprintf("%d %s %s", ts, sapisid, origin)))