func emailFromUserInfo()

in providers/logingov.go [128:173]
40 lines of code
8 McCabe index (conditional complexity)

func emailFromUserInfo(accessToken string, userInfoEndpoint string) (email string, err error) {
	// query the user info endpoint for user attributes
	var req *http.Request
	req, err = http.NewRequest("GET", userInfoEndpoint, nil)
	if err != nil {
		return
	}
	req.Header.Set("Authorization", "Bearer "+accessToken)

	resp, err := http.DefaultClient.Do(req)
	if err != nil {
		return
	}
	var body []byte
	body, err = ioutil.ReadAll(resp.Body)
	resp.Body.Close()
	if err != nil {
		return
	}

	if resp.StatusCode != 200 {
		err = fmt.Errorf("got %d from %q %s", resp.StatusCode, userInfoEndpoint, body)
		return
	}

	// parse the user attributes from the data we got and make sure that
	// the email address has been validated.
	var emailData struct {
		Email         string `json:"email"`
		EmailVerified bool   `json:"email_verified"`
	}
	err = json.Unmarshal(body, &emailData)
	if err != nil {
		return
	}
	if emailData.Email == "" {
		err = fmt.Errorf("missing email")
		return
	}
	email = emailData.Email
	if !emailData.EmailVerified {
		err = fmt.Errorf("email %s not listed as verified", email)
		return
	}
	return
}