Imports github.com/go-acme/lego/platform/wait github.com/go-acme/lego/acme github.com/go-acme/lego/acme/api github.com/go-acme/lego/challenge github.com/go-acme/lego/log github.com/miekg/dns Standard library imports strconv strings sync time bufio crypto/sha256 encoding/base64 errors fmt net os