Handle extra "Send text message" challenge page

It seems some times google will present an extra "Send text message"
challenge page that requires the user to click on the button to actually
get text message sent and present the code input in the next page.

pkg/provider/googleapps/googleapps.go

@@ -339,6 +339,26 @@ func (kc *Client) loadChallengePage(submitURL string, referer string, authForm u
 			return kc.loadResponsePage(secondActionURL, submitURL, responseForm)
 		case strings.Contains(secondActionURL, "challenge/ipp/"): // handle SMS challenge
 
+			if extractNodeText(doc, "button", "Send text message") != "" {
+				responseForm.Set("SendMethod", "SMS") // extractInputsByFormID does not extract the name and value from <button> tag that is the form submit
+				doc, err = kc.loadResponsePage(secondActionURL, submitURL, responseForm)
+				if err != nil {
+					return nil, errors.Wrap(err, "failed to post sms request form")
+				}
+				doc.Url, err = url.Parse(submitURL)
+				if err != nil {
+					return nil, errors.Wrap(err, "failed to define URL for html doc")
+				}
+
+				submitURL = secondActionURL
+				responseForm, secondActionURL, err = extractInputsByFormID(doc, "challenge")
+				if err != nil {
+					return nil, errors.Wrap(err, "unable to extract challenge form")
+				}
+
+				logger.Debugf("After sms request secondActionURL: %s", secondActionURL)
+			}
+
 			var token = prompter.StringRequired("Enter SMS token: G-")
 
 			responseForm.Set("Pin", token)