Imports github.com/go-acme/lego/v4/acme github.com/go-acme/lego/v4/acme/api github.com/go-acme/lego/v4/challenge github.com/go-acme/lego/v4/log github.com/go-acme/lego/v4/platform/wait github.com/miekg/dns Standard library imports bufio crypto/sha256 encoding/base64 errors fmt net os slices strconv strings sync time