Imports github.com/xenolf/lego/log github.com/xenolf/lego/acme github.com/StackExchange/dnscontrol/models github.com/hashicorp/vault/api github.com/StackExchange/dnscontrol/pkg/nameservers Standard library imports crypto crypto/ecdsa crypto/elliptic crypto/rand crypto/x509 encoding/json encoding/pem fmt io/ioutil log net/url os path/filepath sort strings time