Stubs for acmedns and its test

Signed-off-by: Max Ehrlich <max.ehr@gmail.com>

pkg/issuer/acme/dns/acmedns/acmedns.go

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+// Package acmedns implements a DNS provider for solving DNS-01 challenges using
+// Joohoi's acme-dns project. For more information see the ACME-DNS homepage:
+//    https://github.com/joohoi/acme-dns
+package acmedns
+
+import (
+	"errors"
+	"fmt"
+
+	"github.com/cpu/goacmedns"
+	"time"
+)
+
+// DNSProvider is an implementation of the acme.ChallengeProvider interface
+type DNSProvider struct {
+}
+
+// NewDNSProvider returns a DNSProvider instance configured for ACME DNS
+// Credentials are handled automatically by the API
+func NewDNSProvider() (*DNSProvider, error) {
+	return &DNSProvider{}, nil
+}
+
+// Present creates a TXT record to fulfil the dns-01 challenge
+func (c *DNSProvider) Present(domain, token, keyAuth string) error {
+	return nil
+}
+
+// CleanUp removes the record matching the specified parameters. It is not
+// implemented for the ACME-DNS provider.
+func (c *DNSProvider) CleanUp(_, _, _ string) error {
+	// ACME-DNS doesn't support the notion of removing a record. For users of
+	// ACME-DNS it is expected the stale records remain in-place.
+	return nil
+}
+
+// Timeout returns the timeout and interval to use when checking for DNS
+// propagation. Adjusting here to cope with spikes in propagation times.
+func (c *DNSProvider) Timeout() (timeout, interval time.Duration) {
+	return 120 * time.Second, 2 * time.Second
+}

pkg/issuer/acme/dns/acmedns/acmedns_test.go

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+package acmedns