Buffalo Auth Tutorial: Checking if a user is logged in

middleware.go

// CheckAuth is the middlewar to check if a user is logged on.
func CheckAuth(next buffalo.Handler) buffalo.Handler {
	return func(c buffalo.Context) error {
		// Read the userID out of the session
		userID := c.Session().Get("userID")
		// If there is no userID redirect to the login page
		if userID == nil {
			err := c.Redirect(http.StatusTemporaryRedirect, "/login")
			return err
		}
    // If not, call the next handler
		err := next(c)
		return err
	}
}