New DNS provider PowerDNS (#748)

* Added PowerDNS as dns provider * Remove unnecessary comments * Some tests * Implemented feedback
2024-05-11 05:55:12 +00:00 · 2020-05-30 15:54:07 +02:00
parent 5269540827
commit ffd4e46dda
43 changed files with 1504 additions and 0 deletions
--- a/1
+++ b/1
@ -20,3 +20,4 @@ providers/ns1 @captncraig
 # providers/softlayer
 providers/vultr  @geek1011
 providers/ovh @masterzen
+providers/powerdns @jpbede
--- a/README.md
+++ b/README.md
@ -36,6 +36,7 @@ Currently supported DNS providers:
 - OVH
 - OctoDNS
 - OpenSRS
+ - PowerDNS
 - SoftLayer
 - Vultr

--- a/docs/_providers/powerdns.md
+++ b/docs/_providers/powerdns.md
@ -0,0 +1,57 @@
+---
+name: PowerDNS
+title: PowerDNS Provider
+layout: default
+jsId: POWERDNS
+---
+# PowerDNS Provider
+
+## Configuration
+In your credentials file, you must provide your [API URL, API Key and Server ID](https://doc.powerdns.com/authoritative/http-api/index.html). 
+
+In most cases the Server id is `localhost`
+
+{% highlight json %}
+{
+  "powerdns": {
+    "apiurl": "http://localhost",
+    "apikey": "your-key",
+    "servername": "localhost"
+  }
+}
+{% endhighlight %}
+
+## Metadata
+Following metadata are available:
+
+{% highlight js %}
+{
+    'default_ns': [
+        'a.example.com.',
+        'b.example.com.'
+    ],
+    'dnssec_on_create': false
+}
+{% endhighlight %}
+
+- `default_ns` sets the nameserver which are used
+- `dnssec_on_create` specifies if DNSSEC should be enabled when creating zones
+
+## Usage
+Example Javascript:
+
+{% highlight js %}
+var REG_NONE = NewRegistrar('none', 'NONE')
+var POWERDNS = NewDnsProvider("powerdns", "POWERDNS");
+
+D("example.tld", REG_NONE, DnsProvider(POWERDNS),
+    A("test","1.2.3.4")
+);
+{%endhighlight%}
+
+## Activation
+See the [PowerDNS documentation](https://doc.powerdns.com/authoritative/http-api/index.html) how the API can be enabled.
+
+## Caveats
+Currently it is only possible to enable DNSSec while creating a new zone.
+On-demand activation/deactivation of DNSSec will be added later.
--- a/docs/provider-list.md
+++ b/docs/provider-list.md
@ -87,6 +87,7 @@ Maintainers of contributed providers:
 * `OCTODNS` @TomOnTime
 * `OPENSRS` @pierre-emmanuelJ
 * `OVH` @masterzen
+* `POWERDNS` @jpbede
 * `SOFTLAYER`@jamielennox
 * `VULTR` @geek1011

--- a/go.mod
+++ b/go.mod
@ -29,6 +29,7 @@ require (
 	github.com/jarcoal/httpmock v1.0.4 // indirect
 	github.com/malexdev/utfutil v0.0.0-20180510171754-00c8d4a8e7a8 // indirect
 	github.com/miekg/dns v1.1.29
+	github.com/mittwald/go-powerdns v0.4.0
 	github.com/mjibson/esc v0.2.0
 	github.com/namedotcom/go v0.0.0-20180403034216-08470befbe04
 	github.com/ovh/go-ovh v0.0.0-20181109152953-ba5adb4cf014
--- a/go.sum
+++ b/go.sum
@ -167,6 +167,8 @@ github.com/gopherjs/gopherjs v0.0.0-20181017120253-0766667cb4d1 h1:EGx4pi6eqNxGa
 github.com/gopherjs/gopherjs v0.0.0-20181017120253-0766667cb4d1/go.mod h1:wJfORRmW1u3UXTncJ5qlYoELFm8eSnnEO6hX4iZ3EWY=
 github.com/gopherjs/jquery v0.0.0-20191017083323-73f4c7416038 h1:/gx6joY4PjXUu6mKM4yx7yj9Ti6yP8ljOxY/Qt0J25g=
 github.com/gopherjs/jquery v0.0.0-20191017083323-73f4c7416038/go.mod h1:xKR3tvLne+vYYPH9d4DM8X9MKlNV2yXDEomxulcK218=
+github.com/h2non/parth v0.0.0-20190131123155-b4df798d6542 h1:2VTzZjLZBgl62/EtslCrtky5vbi9dd7HrQPQIx6wqiw=
+github.com/h2non/parth v0.0.0-20190131123155-b4df798d6542/go.mod h1:Ow0tF8D4Kplbc8s8sSb3V2oUCygFHVp8gC3Dn6U4MNI=
 github.com/hashicorp/errwrap v1.0.0 h1:hLrqtEDnRye3+sgx6z4qVLNuviH3MR5aQ0ykNJa/UYA=
 github.com/hashicorp/errwrap v1.0.0/go.mod h1:YH+1FKiLXxHSkmPseP+kNlulaMuP3n2brvKWEqk/Jc4=
 github.com/hashicorp/go-cleanhttp v0.5.0/go.mod h1:JpRdi6/HCYpAwUzNwuwqhbovhLtngrth3wmdIIUrZ80=
@ -234,10 +236,14 @@ github.com/mitchellh/go-wordwrap v1.0.0/go.mod h1:ZXFpozHsX6DPmq2I0TCekCxypsnAUb
 github.com/mitchellh/mapstructure v1.1.2 h1:fmNYVwqnSfB9mZU6OS2O6GsXM+wcskZDuKQzvN1EDeE=
 github.com/mitchellh/mapstructure v1.1.2/go.mod h1:FVVH3fgwuzCH5S8UJGiWEs2h04kUh9fWfEaFds41c1Y=
 github.com/mitchellh/reflectwalk v1.0.0/go.mod h1:mSTlrgnPZtwu0c4WaC2kGObEpuNDbx0jmZXqmk4esnw=
+github.com/mittwald/go-powerdns v0.4.0 h1:vEl2+4JINusy5NF8weObVRCuvHv8wqNBVMPZSQWq9zo=
+github.com/mittwald/go-powerdns v0.4.0/go.mod h1:bI/sZBAWyTViDknOTp19VfDxVEnh1U7rWPx2aRKtlzg=
 github.com/mjibson/esc v0.2.0 h1:k96hdaR9Z+nMcnDwNrOvhdBqtjyMrbVyxLpsRCdP2mA=
 github.com/mjibson/esc v0.2.0/go.mod h1:9Hw9gxxfHulMF5OJKCyhYD7PzlSdhzXyaGEBRPH1OPs=
 github.com/namedotcom/go v0.0.0-20180403034216-08470befbe04 h1:o6uBwrhM5C8Ll3MAAxrQxRHEu7FkapwTuI2WmL1rw4g=
 github.com/namedotcom/go v0.0.0-20180403034216-08470befbe04/go.mod h1:5sN+Lt1CaY4wsPvgQH/jsuJi4XO2ssZbdsIizr4CVC8=
+github.com/nbio/st v0.0.0-20140626010706-e9e8d9816f32 h1:W6apQkHrMkS0Muv8G/TipAy/FJl/rCYT0+EuS8+Z0z4=
+github.com/nbio/st v0.0.0-20140626010706-e9e8d9816f32/go.mod h1:9wM+0iRr9ahx58uYLpLIr5fm8diHn0JbqRycJi6w0Ms=
 github.com/oklog/run v1.0.0/go.mod h1:dlhp/R75TPv97u0XWUtDeV/lRKWPKSdTuV0TZvrmrQA=
 github.com/ovh/go-ovh v0.0.0-20181109152953-ba5adb4cf014 h1:37VE5TYj2m/FLA9SNr4z0+A0JefvTmR60Zwf8XSEV7c=
 github.com/ovh/go-ovh v0.0.0-20181109152953-ba5adb4cf014/go.mod h1:joRatxRJaZBsY3JAOEMcoOp05CnZzsx4scTxi95DHyQ=
@ -531,6 +537,8 @@ gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8
 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 h1:YR8cESwS4TdDjEe65xsg0ogRM/Nc3DYOhEAlW+xobZo=
 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
+gopkg.in/h2non/gock.v1 v1.0.14 h1:fTeu9fcUvSnLNacYvYI54h+1/XEteDyHvrVCZEEEYNM=
+gopkg.in/h2non/gock.v1 v1.0.14/go.mod h1:sX4zAkdYX1TRGJ2JY156cFspQn4yRWn6p9EMdODlynE=
 gopkg.in/ini.v1 v1.42.0 h1:7N3gPTt50s8GuLortA00n8AqRTk75qOP98+mTPpgzRk=
 gopkg.in/ini.v1 v1.42.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
 gopkg.in/ns1/ns1-go.v2 v2.0.0-20170502175150-c563826f4cbe h1:fuu3vZ8C6O8mk8Ich8YfkDv/Zpnx1HUotQk8JocBcSw=
--- a/integrationTest/providers.json
+++ b/integrationTest/providers.json
@ -104,6 +104,11 @@
    "consumer-key": "$OVH_CONSUMER_KEY",
    "domain": "$OVH_DOMAIN"
  },
+  "POWERDNS": {
+    "apikey": "$POWERDNS_APIKEY",
+    "apiurl": "$POWERDNS_APIURL",
+    "servername": "$POWERDNS_SERVERNAME"
+  },
  "ROUTE53": {
    "KeyId": "$R53_KEY_ID",
    "SecretKey": "$R53_KEY",
--- a/providers/_all/all.go
+++ b/providers/_all/all.go
@ -25,6 +25,7 @@ import (
 	_ "github.com/StackExchange/dnscontrol/v3/providers/octodns"
 	_ "github.com/StackExchange/dnscontrol/v3/providers/opensrs"
 	_ "github.com/StackExchange/dnscontrol/v3/providers/ovh"
+	_ "github.com/StackExchange/dnscontrol/v3/providers/powerdns"
 	_ "github.com/StackExchange/dnscontrol/v3/providers/route53"
 	_ "github.com/StackExchange/dnscontrol/v3/providers/softlayer"
 	_ "github.com/StackExchange/dnscontrol/v3/providers/vultr"
--- a/providers/powerdns/powerdnsProvider.go
+++ b/providers/powerdns/powerdnsProvider.go
@ -0,0 +1,244 @@
+package powerdns
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"github.com/StackExchange/dnscontrol/v3/models"
+	"github.com/StackExchange/dnscontrol/v3/pkg/diff"
+	"github.com/StackExchange/dnscontrol/v3/providers"
+	"github.com/miekg/dns/dnsutil"
+	"github.com/mittwald/go-powerdns"
+	"github.com/mittwald/go-powerdns/apis/zones"
+	"strings"
+)
+
+var features = providers.DocumentationNotes{
+	providers.CanUseAlias:            providers.Can(),
+	providers.CanUseCAA:              providers.Can(),
+	providers.CanUsePTR:              providers.Can(),
+	providers.CanUseSRV:              providers.Can(),
+	providers.CanUseTLSA:             providers.Can(),
+	providers.CanUseSSHFP:            providers.Can(),
+	providers.CanAutoDNSSEC:          providers.Unimplemented("Need support in library first"),
+	providers.DocCreateDomains:       providers.Can(),
+	providers.DocOfficiallySupported: providers.Cannot(),
+	providers.CanGetZones:            providers.Can(),
+}
+
+func init() {
+	providers.RegisterDomainServiceProviderType("POWERDNS", NewProvider, features)
+}
+
+// PowerDNS represents the PowerDNS DNSServiceProvider.
+type PowerDNS struct {
+	client         pdns.Client
+	APIKey         string
+	APIUrl         string
+	ServerName     string
+	DefaultNS      []string `json:"default_ns"`
+	DNSSecOnCreate bool     `json:"dnssec_on_create"`
+
+	nameservers []*models.Nameserver
+}
+
+// NewProvider initializes a PowerDNS DNSServiceProvider.
+func NewProvider(m map[string]string, metadata json.RawMessage) (providers.DNSServiceProvider, error) {
+	api := &PowerDNS{}
+
+	api.APIKey = m["apiKey"]
+	if api.APIKey == "" {
+		return nil, fmt.Errorf("PowerDNS API Key is required")
+	}
+
+	api.APIUrl = m["apiUrl"]
+	if api.APIUrl == "" {
+		return nil, fmt.Errorf("PowerDNS API URL is required")
+	}
+
+	api.ServerName = m["serverName"]
+	if api.ServerName == "" {
+		return nil, fmt.Errorf("PowerDNS server name is required")
+	}
+
+	// load js config
+	if len(metadata) != 0 {
+		err := json.Unmarshal(metadata, api)
+		if err != nil {
+			return nil, err
+		}
+	}
+	var nss []string
+	for _, ns := range api.DefaultNS {
+		nss = append(nss, ns[0:len(ns)-1])
+	}
+	var err error
+	api.nameservers, err = models.ToNameservers(nss)
+	if err != nil {
+		return api, err
+	}
+
+	var clientErr error
+	api.client, clientErr = pdns.New(
+		pdns.WithBaseURL(api.APIUrl),
+		pdns.WithAPIKeyAuthentication(api.APIKey),
+	)
+	return api, clientErr
+}
+
+// GetNameservers returns the nameservers for a domain.
+func (api *PowerDNS) GetNameservers(string) ([]*models.Nameserver, error) {
+	var r []string
+	for _, j := range api.nameservers {
+		r = append(r, j.Name)
+	}
+	return models.ToNameservers(r)
+}
+
+// ListZones returns all the zones in an account
+func (api *PowerDNS) ListZones() ([]string, error) {
+	var result []string
+	zones, err := api.client.Zones().ListZones(context.Background(), api.ServerName)
+	if err != nil {
+		return result, err
+	}
+	for _, zone := range zones {
+		result = append(result, zone.Name)
+	}
+	return result, nil
+}
+
+// GetZoneRecords gets the records of a zone and returns them in RecordConfig format.
+func (api *PowerDNS) GetZoneRecords(domain string) (models.Records, error) {
+	zone, err := api.client.Zones().GetZone(context.Background(), api.ServerName, domain)
+	if err != nil {
+		return nil, err
+	}
+
+	curRecords := models.Records{}
+	// loop over grouped records by type, called RRSet
+	for _, rrset := range zone.ResourceRecordSets {
+		if rrset.Type == "SOA" {
+			continue
+		}
+		// loop over single records of this group and create records
+		for _, pdnsRecord := range rrset.Records {
+			r, err := toRecordConfig(domain, pdnsRecord, rrset.TTL, rrset.Name, rrset.Type)
+			if err != nil {
+				return nil, err
+			}
+			curRecords = append(curRecords, r)
+		}
+	}
+
+	return curRecords, nil
+}
+
+// GetDomainCorrections returns a list of corrections to update a domain.
+func (api *PowerDNS) GetDomainCorrections(dc *models.DomainConfig) ([]*models.Correction, error) {
+	var corrections []*models.Correction
+
+	// record corrections
+	curRecords, err := api.GetZoneRecords(dc.Name)
+	if err != nil {
+		return nil, err
+	}
+
+	// post-process records
+	dc.Punycode()
+	models.PostProcessRecords(curRecords)
+
+	// create record diff by group
+	keysToUpdate := (diff.New(dc)).ChangedGroups(curRecords)
+	desiredRecords := dc.Records.GroupedByKey()
+
+	// create corrections by group
+	for label, msgs := range keysToUpdate {
+		labelName := label.NameFQDN + "."
+		labelType := label.Type
+
+		if _, ok := desiredRecords[label]; !ok {
+			// nothing found, must be a delete
+			corrections = append(corrections, &models.Correction{
+				Msg: strings.Join(msgs, "\n   "),
+				F: func() error {
+					return api.client.Zones().RemoveRecordSetFromZone(context.Background(), api.ServerName, dc.Name, labelName, labelType)
+				},
+			})
+		} else {
+			ttl := desiredRecords[label][0].TTL
+			records := []zones.Record{}
+			for _, recordContent := range desiredRecords[label] {
+				records = append(records, zones.Record{
+					Content: recordContent.GetTargetCombined(),
+				})
+			}
+			corrections = append(corrections, &models.Correction{
+				Msg: strings.Join(msgs, "\n   "),
+				F: func() error {
+					return api.client.Zones().AddRecordSetToZone(context.Background(), api.ServerName, dc.Name, zones.ResourceRecordSet{
+						Name:    labelName,
+						Type:    labelType,
+						TTL:     int(ttl),
+						Records: records,
+					})
+				},
+			})
+		}
+	}
+
+	// DNSSec corrections
+	// TODO: Implementing of on-demand DNSSec creation in library
+
+	return corrections, nil
+}
+
+// EnsureDomainExists adds a domain to the DNS service if it does not exist
+func (api *PowerDNS) EnsureDomainExists(domain string) error {
+	if zone, _ := api.client.Zones().GetZone(context.Background(), api.ServerName, domain); zone.ID != "" {
+		return nil
+	}
+
+	_, err := api.client.Zones().CreateZone(context.Background(), api.ServerName, zones.Zone{
+		Name:        domain,
+		Type:        zones.ZoneTypeZone,
+		DNSSec:      api.DNSSecOnCreate,
+		Nameservers: api.DefaultNS,
+	})
+	return err
+}
+
+// toRecordConfig converts a PowerDNS DNSRecord to a RecordConfig. #rtype_variations
+func toRecordConfig(domain string, r zones.Record, ttl int, name string, rtype string) (*models.RecordConfig, error) {
+	// trimming trailing dot and domain from name
+	name = strings.TrimSuffix(name, domain+".")
+	name = strings.TrimSuffix(name, ".")
+
+	rc := &models.RecordConfig{
+		TTL:      uint32(ttl),
+		Original: r,
+		Type:     rtype,
+	}
+	rc.SetLabel(name, domain)
+
+	content := r.Content
+	switch rtype {
+	case "CNAME", "NS":
+		return rc, rc.SetTarget(dnsutil.AddOrigin(content, domain))
+	case "CAA":
+		return rc, rc.SetTargetCAAString(content)
+	case "MX":
+		return rc, rc.SetTargetMXString(content)
+	case "SRV":
+		return rc, rc.SetTargetSRVString(content)
+	case "TXT":
+		// Remove quotes if it is a TXT record.
+		if !strings.HasPrefix(content, `"`) || !strings.HasSuffix(content, `"`) {
+			return nil, errors.New("Unexpected lack of quotes in TXT record from PowerDNS")
+		}
+		return rc, rc.SetTargetTXT(content[1 : len(content)-1])
+	default:
+		return rc, rc.PopulateFromString(rtype, content, domain)
+	}
+}
--- a/vendor/github.com/mittwald/go-powerdns/.gitignore
+++ b/vendor/github.com/mittwald/go-powerdns/.gitignore
@ -0,0 +1 @@
+/.idea
--- a/vendor/github.com/mittwald/go-powerdns/.travis.yml
+++ b/vendor/github.com/mittwald/go-powerdns/.travis.yml
@ -0,0 +1,14 @@
+language: go
+go:
+  - 1.12
+  - 1.11
+
+install: []
+
+services:
+  - docker
+
+script:
+  - GO111MODULE=on go vet
+  - GO111MODULE=on go test ./...
+  - GO111MODULE=on go build
--- a/vendor/github.com/mittwald/go-powerdns/LICENSE
+++ b/vendor/github.com/mittwald/go-powerdns/LICENSE
@ -0,0 +1,201 @@
+                              Apache License
+                        Version 2.0, January 2004
+                     http://www.apache.org/licenses/
+
+TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+1. Definitions.
+
+   "License" shall mean the terms and conditions for use, reproduction,
+   and distribution as defined by Sections 1 through 9 of this document.
+
+   "Licensor" shall mean the copyright owner or entity authorized by
+   the copyright owner that is granting the License.
+
+   "Legal Entity" shall mean the union of the acting entity and all
+   other entities that control, are controlled by, or are under common
+   control with that entity. For the purposes of this definition,
+   "control" means (i) the power, direct or indirect, to cause the
+   direction or management of such entity, whether by contract or
+   otherwise, or (ii) ownership of fifty percent (50%) or more of the
+   outstanding shares, or (iii) beneficial ownership of such entity.
+
+   "You" (or "Your") shall mean an individual or Legal Entity
+   exercising permissions granted by this License.
+
+   "Source" form shall mean the preferred form for making modifications,
+   including but not limited to software source code, documentation
+   source, and configuration files.
+
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+   transformation or translation of a Source form, including but
+   not limited to compiled object code, generated documentation,
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+
+   "Work" shall mean the work of authorship, whether in Source or
+   Object form, made available under the License, as indicated by a
+   copyright notice that is included in or attached to the work
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+
+   "Derivative Works" shall mean any work, whether in Source or Object
+   form, that is based on (or derived from) the Work and for which the
+   editorial revisions, annotations, elaborations, or other modifications
+   represent, as a whole, an original work of authorship. For the purposes
+   of this License, Derivative Works shall not include works that remain
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+   subsequently incorporated within the Work.
+
+2. Grant of Copyright License. Subject to the terms and conditions of
+   this License, each Contributor hereby grants to You a perpetual,
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+   copyright license to reproduce, prepare Derivative Works of,
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+
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+   or contributory patent infringement, then any patent licenses
+   granted to You under this License for that Work shall terminate
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+4. Redistribution. You may reproduce and distribute copies of the
+   Work or Derivative Works thereof in any medium, with or without
+   modifications, and in Source or Object form, provided that You
+   meet the following conditions:
+
+   (a) You must give any other recipients of the Work or
+       Derivative Works a copy of this License; and
+
+   (b) You must cause any modified files to carry prominent notices
+       stating that You changed the files; and
+
+   (c) You must retain, in the Source form of any Derivative Works
+       that You distribute, all copyright, patent, trademark, and
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+       the Derivative Works; and
+
+   (d) If the Work includes a "NOTICE" text file as part of its
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+       wherever such third-party notices normally appear. The contents
+       of the NOTICE file are for informational purposes only and
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+       notices within Derivative Works that You distribute, alongside
+       or as an addendum to the NOTICE text from the Work, provided
+       that such additional attribution notices cannot be construed
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+
+   You may add Your own copyright statement to Your modifications and
+   may provide additional or different license terms and conditions
+   for use, reproduction, or distribution of Your modifications, or
+   for any such Derivative Works as a whole, provided Your use,
+   reproduction, and distribution of the Work otherwise complies with
+   the conditions stated in this License.
+
+5. Submission of Contributions. Unless You explicitly state otherwise,
+   any Contribution intentionally submitted for inclusion in the Work
+   by You to the Licensor shall be under the terms and conditions of
+   this License, without any additional terms or conditions.
+   Notwithstanding the above, nothing herein shall supersede or modify
+   the terms of any separate license agreement you may have executed
+   with Licensor regarding such Contributions.
+
+6. Trademarks. This License does not grant permission to use the trade
+   names, trademarks, service marks, or product names of the Licensor,
+   except as required for reasonable and customary use in describing the
+   origin of the Work and reproducing the content of the NOTICE file.
+
+7. Disclaimer of Warranty. Unless required by applicable law or
+   agreed to in writing, Licensor provides the Work (and each
+   Contributor provides its Contributions) on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+   implied, including, without limitation, any warranties or conditions
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+   PARTICULAR PURPOSE. You are solely responsible for determining the
+   appropriateness of using or redistributing the Work and assume any
+   risks associated with Your exercise of permissions under this License.
+
+8. Limitation of Liability. In no event and under no legal theory,
+   whether in tort (including negligence), contract, or otherwise,
+   unless required by applicable law (such as deliberate and grossly
+   negligent acts) or agreed to in writing, shall any Contributor be
+   liable to You for damages, including any direct, indirect, special,
+   incidental, or consequential damages of any character arising as a
+   result of this License or out of the use or inability to use the
+   Work (including but not limited to damages for loss of goodwill,
+   work stoppage, computer failure or malfunction, or any and all
+   other commercial damages or losses), even if such Contributor
+   has been advised of the possibility of such damages.
+
+9. Accepting Warranty or Additional Liability. While redistributing
+   the Work or Derivative Works thereof, You may choose to offer,
+   and charge a fee for, acceptance of support, warranty, indemnity,
+   or other liability obligations and/or rights consistent with this
+   License. However, in accepting such obligations, You may act only
+   on Your own behalf and on Your sole responsibility, not on behalf
+   of any other Contributor, and only if You agree to indemnify,
+   defend, and hold each Contributor harmless for any liability
+   incurred by, or claims asserted against, such Contributor by reason
+   of your accepting any such warranty or additional liability.
+
+END OF TERMS AND CONDITIONS
+
+APPENDIX: How to apply the Apache License to your work.
+
+   To apply the Apache License to your work, attach the following
+   boilerplate notice, with the fields enclosed by brackets "[]"
+   replaced with your own identifying information. (Don't include
+   the brackets!)  The text should be enclosed in the appropriate
+   comment syntax for the file format. We also recommend that a
+   file or class name and description of purpose be included on the
+   same "printed page" as the copyright notice for easier
+   identification within third-party archives.
+
+Copyright [yyyy] [name of copyright owner]
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
--- a/vendor/github.com/mittwald/go-powerdns/README.md
+++ b/vendor/github.com/mittwald/go-powerdns/README.md
@ -0,0 +1,77 @@
+# PowerDNS client library for Go
+
+[![GoDoc](https://godoc.org/github.com/mittwald/go-powerdns?status.svg)](https://godoc.org/github.com/mittwald/go-powerdns)
+[![Build Status](https://travis-ci.org/mittwald/go-powerdns.svg?branch=master)](https://travis-ci.org/mittwald/go-powerdns)
+[![Maintainability](https://api.codeclimate.com/v1/badges/aa54a869f5ff56477a2a/maintainability)](https://codeclimate.com/github/mittwald/go-powerdns/maintainability)
+
+This package contains a Go library for accessing the [PowerDNS][powerdns] Authoritative API.
+
+## Supported features
+
+- [x] Servers
+- [x] Zones
+- [ ] Cryptokeys
+- [ ] Metadata
+- [ ] TSIG Keys
+- [x] Searching
+- [ ] Statistics
+- [x] Cache
+
+## Installation
+
+Install using `go get`:
+
+```console
+> go get github.com/mittwald/go-powerdns
+```
+
+## Usage
+
+First, instantiate a client using `pdns.New`:
+
+```go
+client, err := pdns.New(
+    pdns.WithBaseURL("http://localhost:8081"),
+    pdns.WithAPIKeyAuthentication("supersecret"),
+)
+```
+
+The client then offers more specialiced sub-clients, for example for managing server and zones.
+Have a look at this library's [documentation][godoc] for more information.
+
+## Complete example
+
+```go
+package main
+
+import "context"
+import "github.com/mittwald/go-powerdns"
+import "github.com/mittwald/go-powerdns/apis/zones"
+
+func main() {
+    client, err := pdns.New(
+        pdns.WithBaseURL("http://localhost:8081"),
+        pdns.WithAPIKeyAuthentication("supersecret"),
+    )
+	
+    if err != nil {
+    	panic(err)
+    }
+    
+    client.Zones().CreateZone(context.Background(), "localhost", zones.Zone{
+        Name: "mydomain.example.",
+        Type: zones.ZoneTypeZone,
+        Kind: zones.ZoneKindNative,
+        Nameservers: []string{
+            "ns1.example.com.",
+            "ns2.example.com.",
+        },
+        ResourceRecordSets: []zones.ResourceRecordSet{
+            {Name: "foo.mydomain.example.", Type: "A", TTL: 60, Records: []zones.Record{{Content: "127.0.0.1"}}},
+        },
+    })
+}
+```
+
+[powerdns]: https://github.com/PowerDNS/pdns
+[godoc]: https://godoc.org/github.com/mittwald/go-powerdns
--- a/vendor/github.com/mittwald/go-powerdns/apis/cache/client.go
+++ b/vendor/github.com/mittwald/go-powerdns/apis/cache/client.go
@ -0,0 +1,14 @@
+package cache
+
+import "github.com/mittwald/go-powerdns/pdnshttp"
+
+type client struct {
+	httpClient *pdnshttp.Client
+}
+
+// New creates a new Cache client
+func New(hc *pdnshttp.Client) Client {
+	return &client{
+		httpClient: hc,
+	}
+}
--- a/vendor/github.com/mittwald/go-powerdns/apis/cache/doc.go
+++ b/vendor/github.com/mittwald/go-powerdns/apis/cache/doc.go
@ -0,0 +1,6 @@
+// Package cache contains a specialized client for interacting with PowerDNS' "Cache" API.
+//
+// More information
+//
+// Official API documentation: https://doc.powerdns.com/authoritative/http-api/cache.html
+package cache
--- a/vendor/github.com/mittwald/go-powerdns/apis/cache/flush.go
+++ b/vendor/github.com/mittwald/go-powerdns/apis/cache/flush.go
@ -0,0 +1,21 @@
+package cache
+
+import (
+	"context"
+	"fmt"
+	"net/url"
+
+	"github.com/mittwald/go-powerdns/pdnshttp"
+)
+
+func (c *client) Flush(ctx context.Context, serverID string, name string) (*FlushResult, error) {
+	cfr := FlushResult{}
+	path := fmt.Sprintf("/api/v1/servers/%s/cache/flush", url.PathEscape(serverID))
+
+	err := c.httpClient.Put(ctx, path, &cfr, pdnshttp.WithQueryValue("domain", name))
+	if err != nil {
+		return nil, err
+	}
+
+	return &cfr, nil
+}
--- a/vendor/github.com/mittwald/go-powerdns/apis/cache/interface.go
+++ b/vendor/github.com/mittwald/go-powerdns/apis/cache/interface.go
@ -0,0 +1,9 @@
+package cache
+
+import "context"
+
+// Client defines the interface for Cache operations.
+type Client interface {
+	// Flush flush a cache-entry by name
+	Flush(ctx context.Context, serverID string, name string) (*FlushResult, error)
+}
--- a/vendor/github.com/mittwald/go-powerdns/apis/cache/types.go
+++ b/vendor/github.com/mittwald/go-powerdns/apis/cache/types.go
@ -0,0 +1,7 @@
+package cache
+
+// FlushResult represent the result of a cache-flush.
+type FlushResult struct {
+	Count  int    `json:"count"`
+	Result string `json:"result"`
+}
--- a/vendor/github.com/mittwald/go-powerdns/apis/search/client.go
+++ b/vendor/github.com/mittwald/go-powerdns/apis/search/client.go
@ -0,0 +1,14 @@
+package search
+
+import "github.com/mittwald/go-powerdns/pdnshttp"
+
+type client struct {
+	httpClient *pdnshttp.Client
+}
+
+// New creates a new Search client
+func New(hc *pdnshttp.Client) Client {
+	return &client{
+		httpClient: hc,
+	}
+}
--- a/vendor/github.com/mittwald/go-powerdns/apis/search/interface.go
+++ b/vendor/github.com/mittwald/go-powerdns/apis/search/interface.go
@ -0,0 +1,10 @@
+package search
+
+import "context"
+
+// Client defines method for interacting with the PowerDNS "Search" endpoints
+type Client interface {
+
+	// ListServers lists all known servers
+	Search(ctx context.Context, serverID, query string, max int, objectType ObjectType) (ResultList, error)
+}
--- a/vendor/github.com/mittwald/go-powerdns/apis/search/search.go
+++ b/vendor/github.com/mittwald/go-powerdns/apis/search/search.go
@ -0,0 +1,28 @@
+package search
+
+import (
+	"context"
+	"fmt"
+	"github.com/mittwald/go-powerdns/pdnshttp"
+	"net/url"
+)
+
+func (c *client) Search(ctx context.Context, serverID, query string, max int, objectType ObjectType) (ResultList, error) {
+	path := fmt.Sprintf("/api/v1/servers/%s/search-data", url.PathEscape(serverID))
+	results := make(ResultList, 0)
+
+	err := c.httpClient.Get(
+		ctx,
+		path,
+		&results,
+		pdnshttp.WithQueryValue("q", query),
+		pdnshttp.WithQueryValue("max", fmt.Sprintf("%d", max)),
+		pdnshttp.WithQueryValue("object_type", objectType.String()),
+	)
+
+	if err != nil {
+		return nil, err
+	}
+
+	return results, nil
+}
--- a/vendor/github.com/mittwald/go-powerdns/apis/search/types.go
+++ b/vendor/github.com/mittwald/go-powerdns/apis/search/types.go
@ -0,0 +1,63 @@
+package search
+
+import "fmt"
+
+// ObjectType represents the object type for which a search should be performed
+type ObjectType int
+
+// Possible object types; according to the PowerDNS documentation, this list is
+// exhaustive.
+const (
+	_                        = iota
+	ObjectTypeAll ObjectType = iota
+	ObjectTypeZone
+	ObjectTypeRecord
+	ObjectTypeComment
+)
+
+// String makes this type implement fmt.Stringer
+func (t ObjectType) String() string {
+	switch t {
+	case ObjectTypeAll:
+		return "all"
+	case ObjectTypeZone:
+		return "zone"
+	case ObjectTypeRecord:
+		return "record"
+	case ObjectTypeComment:
+		return "comment"
+	}
+
+	return ""
+}
+
+// UnmarshalJSON makes this type implement json.Unmarshaler
+func (t *ObjectType) UnmarshalJSON(b []byte) error {
+	switch string(b) {
+	case `"all"`:
+		*t = ObjectTypeAll
+	case `"zone"`:
+		*t = ObjectTypeZone
+	case `"record"`:
+		*t = ObjectTypeRecord
+	case `"comment"`:
+		*t = ObjectTypeComment
+	default:
+		return fmt.Errorf(`unknown search type: %s'`, string(b))
+	}
+
+	return nil
+}
+
+// Result represents a single search result. See the documentation for more
+// information: https://doc.powerdns.com/authoritative/http-api/search.html#searchresult
+type Result struct {
+	Content    string     `json:"content"`
+	Disabled   bool       `json:"disabled"`
+	Name       string     `json:"name"`
+	ObjectType ObjectType `json:"object_type"`
+	ZoneID     string     `json:"zone_id"`
+	Zone       string     `json:"zone"`
+	Type       string     `json:"type"`
+	TTL        int        `json:"ttl"`
+}
--- a/vendor/github.com/mittwald/go-powerdns/apis/search/types_resultlist.go
+++ b/vendor/github.com/mittwald/go-powerdns/apis/search/types_resultlist.go
@ -0,0 +1,37 @@
+package search
+
+// ResultList represents a list of search results. The type itself offers some
+// advanced filtering functions for convenience.
+type ResultList []Result
+
+// FilterByObjectType returns all elements of a result list that are of a given
+// object type.
+func (l ResultList) FilterByObjectType(t ObjectType) ResultList {
+	return l.FilterBy(func(r *Result) bool {
+		return r.ObjectType == t
+	})
+}
+
+// FilterByRecordType returns all elements of a result list that are a resource
+// record and have a certain record type.
+func (l ResultList) FilterByRecordType(t string) ResultList {
+	return l.FilterBy(func(r *Result) bool {
+		return r.ObjectType == ObjectTypeRecord && r.Type == t
+	})
+}
+
+// FilterBy returns all elements of a result list that match a generic matcher
+// function. The "matcher" function will be invoked for each element in the
+// result list; if it returns true, the respective item will be included in the
+// result list.
+func (l ResultList) FilterBy(matcher func(*Result) bool) ResultList {
+	out := make(ResultList, 0, len(l))
+
+	for i := range l {
+		if matcher(&l[i]) {
+			out = append(out, l[i])
+		}
+	}
+
+	return out
+}
--- a/vendor/github.com/mittwald/go-powerdns/apis/servers/client.go
+++ b/vendor/github.com/mittwald/go-powerdns/apis/servers/client.go
@ -0,0 +1,13 @@
+package servers
+
+import "github.com/mittwald/go-powerdns/pdnshttp"
+
+type client struct {
+	httpClient *pdnshttp.Client
+}
+
+func New(hc *pdnshttp.Client) Client {
+	return &client{
+		httpClient: hc,
+	}
+}
--- a/vendor/github.com/mittwald/go-powerdns/apis/servers/doc.go
+++ b/vendor/github.com/mittwald/go-powerdns/apis/servers/doc.go
@ -0,0 +1,6 @@
+// This package contains a specialized client for interacting with PowerDNS' "Servers" API.
+//
+// More information
+//
+// Official API documentation: https://doc.powerdns.com/authoritative/http-api/server.html
+package servers
--- a/vendor/github.com/mittwald/go-powerdns/apis/servers/interface.go
+++ b/vendor/github.com/mittwald/go-powerdns/apis/servers/interface.go
@ -0,0 +1,14 @@
+package servers
+
+import "context"
+
+// Client defines method for interacting with the PowerDNS "Servers" endpoints
+type Client interface {
+
+	// ListServers lists all known servers
+	ListServers(ctx context.Context) ([]Server, error)
+
+	// GetServer returns a specific server. If the server with the given "serverID" does
+	// not exist, the error return value will contain a pdnshttp.ErrNotFound error (see example)
+	GetServer(ctx context.Context, serverID string) (*Server, error)
+}
--- a/vendor/github.com/mittwald/go-powerdns/apis/servers/servers_get.go
+++ b/vendor/github.com/mittwald/go-powerdns/apis/servers/servers_get.go
@ -0,0 +1,18 @@
+package servers
+
+import (
+	"context"
+	"fmt"
+	"net/url"
+)
+
+func (c *client) GetServer(ctx context.Context, serverID string) (*Server, error) {
+	server := Server{}
+	err := c.httpClient.Get(ctx, fmt.Sprintf("/api/v1/servers/%s", url.PathEscape(serverID)), &server)
+
+	if err != nil {
+		return nil, err
+	}
+
+	return &server, err
+}
--- a/vendor/github.com/mittwald/go-powerdns/apis/servers/servers_list.go
+++ b/vendor/github.com/mittwald/go-powerdns/apis/servers/servers_list.go
@ -0,0 +1,14 @@
+package servers
+
+import "context"
+
+func (c *client) ListServers(ctx context.Context) ([]Server, error) {
+	servers := make([]Server, 0)
+
+	err := c.httpClient.Get(ctx, "/api/v1/servers", &servers)
+	if err != nil {
+		return nil, err
+	}
+
+	return servers, nil
+}
--- a/vendor/github.com/mittwald/go-powerdns/apis/servers/types.go
+++ b/vendor/github.com/mittwald/go-powerdns/apis/servers/types.go
@ -0,0 +1,14 @@
+package servers
+
+// Server models a PowerDNS server.
+//
+// More information: https://doc.powerdns.com/authoritative/http-api/server.html#server
+type Server struct {
+	ID         string `json:"id"`
+	Type       string `json:"type"`
+	DaemonType string `json:"daemon_type"`
+	Version    string `json:"version"`
+	URL        string `json:"url,omitempty"`
+	ConfigURL  string `json:"config_url,omitempty"`
+	ZonesURL   string `json:"zones_url,omitempty"`
+}
--- a/vendor/github.com/mittwald/go-powerdns/client.go
+++ b/vendor/github.com/mittwald/go-powerdns/client.go
@ -0,0 +1,129 @@
+package pdns
+
+import (
+	"context"
+	"errors"
+	"io"
+	"io/ioutil"
+	"net/http"
+	"time"
+
+	"github.com/mittwald/go-powerdns/apis/cache"
+	"github.com/mittwald/go-powerdns/apis/search"
+	"github.com/mittwald/go-powerdns/apis/servers"
+	"github.com/mittwald/go-powerdns/apis/zones"
+	"github.com/mittwald/go-powerdns/pdnshttp"
+)
+
+type client struct {
+	baseURL       string
+	httpClient    *http.Client
+	authenticator pdnshttp.ClientAuthenticator
+	debugOutput   io.Writer
+
+	cache   cache.Client
+	search  search.Client
+	servers servers.Client
+	zones   zones.Client
+}
+
+type ClientOption func(c *client) error
+
+// New creates a new PowerDNS client. Various client options can be used to configure
+// the PowerDNS client (see examples).
+func New(opt ...ClientOption) (Client, error) {
+	c := client{
+		baseURL:       "http://localhost:8081",
+		httpClient:    http.DefaultClient,
+		debugOutput:   ioutil.Discard,
+		authenticator: &pdnshttp.NoopAuthenticator{},
+	}
+
+	for i := range opt {
+		if err := opt[i](&c); err != nil {
+			return nil, err
+		}
+	}
+
+	if c.authenticator != nil {
+		err := c.authenticator.OnConnect(c.httpClient)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	hc := pdnshttp.NewClient(c.baseURL, c.httpClient, c.authenticator, c.debugOutput)
+
+	c.servers = servers.New(hc)
+	c.zones = zones.New(hc)
+	c.search = search.New(hc)
+	c.cache = cache.New(hc)
+
+	return &c, nil
+}
+
+func (c *client) Status() error {
+	req, err := http.NewRequest("GET", c.baseURL, nil)
+	if err != nil {
+		return err
+	}
+
+	if err := c.authenticator.OnRequest(req); err != nil {
+		return err
+	}
+
+	_, err = c.httpClient.Do(req)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (c *client) WaitUntilUp(ctx context.Context) error {
+	up := make(chan error)
+	cancel := false
+
+	go func() {
+		for !cancel {
+			req, err := http.NewRequest("GET", c.baseURL, nil)
+			if err != nil {
+				time.Sleep(1 * time.Second)
+				continue
+			}
+
+			_, err = c.httpClient.Do(req)
+			if err != nil {
+				time.Sleep(1 * time.Second)
+				continue
+			}
+
+			up <- nil
+			return
+		}
+	}()
+
+	select {
+	case <-up:
+		return nil
+	case <-ctx.Done():
+		cancel = true
+		return errors.New("context exceeded")
+	}
+}
+
+func (c *client) Servers() servers.Client {
+	return c.servers
+}
+
+func (c *client) Zones() zones.Client {
+	return c.zones
+}
+
+func (c *client) Search() search.Client {
+	return c.search
+}
+
+func (c *client) Cache() cache.Client {
+	return c.cache
+}
--- a/vendor/github.com/mittwald/go-powerdns/doc.go
+++ b/vendor/github.com/mittwald/go-powerdns/doc.go
@ -0,0 +1,2 @@
+// This package contains a client library used for connecting to the PowerDNS API.
+package pdns
--- a/vendor/github.com/mittwald/go-powerdns/docker-compose.yml
+++ b/vendor/github.com/mittwald/go-powerdns/docker-compose.yml
@ -0,0 +1,30 @@
+version: "3"
+services:
+  mysql:
+    image: mariadb:10.1
+    environment:
+      MYSQL_ROOT_PASSWORD: supersecret
+      MYSQL_USER: powerdns
+      MYSQL_PASSWORD: secret
+      MYSQL_DATABASE: powerdns
+    volumes:
+      - database:/var/lib/mysql
+    networks:
+      - backend
+  powerdns:
+    image: psitrax/powerdns
+    environment: 
+      MYSQL_HOST: mysql
+      MYSQL_USER: powerdns
+      MYSQL_PASS: secret
+      MYSQL_DB: powerdns
+    networks:
+      - backend
+    volumes:
+      - ./.docker/pdns:/etc/pdns/conf.d
+    ports:
+      - 8081:8081
+volumes:
+  database: {}
+networks:
+  backend: {}
--- a/vendor/github.com/mittwald/go-powerdns/go.mod
+++ b/vendor/github.com/mittwald/go-powerdns/go.mod
@ -0,0 +1,6 @@
+module github.com/mittwald/go-powerdns
+
+require (
+	github.com/stretchr/testify v1.3.0
+	gopkg.in/h2non/gock.v1 v1.0.14
+)
--- a/vendor/github.com/mittwald/go-powerdns/go.sum
+++ b/vendor/github.com/mittwald/go-powerdns/go.sum
@ -0,0 +1,12 @@
+github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/h2non/parth v0.0.0-20190131123155-b4df798d6542 h1:2VTzZjLZBgl62/EtslCrtky5vbi9dd7HrQPQIx6wqiw=
+github.com/h2non/parth v0.0.0-20190131123155-b4df798d6542/go.mod h1:Ow0tF8D4Kplbc8s8sSb3V2oUCygFHVp8gC3Dn6U4MNI=
+github.com/nbio/st v0.0.0-20140626010706-e9e8d9816f32/go.mod h1:9wM+0iRr9ahx58uYLpLIr5fm8diHn0JbqRycJi6w0Ms=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.3.0 h1:TivCn/peBQ7UY8ooIcPgZFpTNSz0Q2U6UrFlUfqbe0Q=
+github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
+gopkg.in/h2non/gock.v1 v1.0.14 h1:fTeu9fcUvSnLNacYvYI54h+1/XEteDyHvrVCZEEEYNM=
+gopkg.in/h2non/gock.v1 v1.0.14/go.mod h1:sX4zAkdYX1TRGJ2JY156cFspQn4yRWn6p9EMdODlynE=
--- a/vendor/github.com/mittwald/go-powerdns/interface.go
+++ b/vendor/github.com/mittwald/go-powerdns/interface.go
@ -0,0 +1,36 @@
+package pdns
+
+import (
+	"context"
+
+	"github.com/mittwald/go-powerdns/apis/cache"
+	"github.com/mittwald/go-powerdns/apis/search"
+	"github.com/mittwald/go-powerdns/apis/servers"
+	"github.com/mittwald/go-powerdns/apis/zones"
+)
+
+// Client is the root-level interface for interacting with the PowerDNS API.
+// You can instantiate an implementation of this interface using the "New" function.
+type Client interface {
+
+	// Status checks if the PowerDNS API is reachable. This does a simple HTTP connection check;
+	// it will NOT check if your authentication is set up correctly (except you're using TLS client
+	// authentication.
+	Status() error
+
+	// WaitUntilUp will block until the PowerDNS API accepts HTTP requests. You can use the "ctx"
+	// parameter to make this method wait only for (or until) a certain time (see examples).
+	WaitUntilUp(ctx context.Context) error
+
+	// Servers returns a specialized API for interacting with PowerDNS servers
+	Servers() servers.Client
+
+	// Zones returns a specialized API for interacting with PowerDNS zones
+	Zones() zones.Client
+
+	// Search returns a specialized API for searching
+	Search() search.Client
+
+	// Cache returns a specialized API for caching
+	Cache() cache.Client
+}
--- a/vendor/github.com/mittwald/go-powerdns/options.go
+++ b/vendor/github.com/mittwald/go-powerdns/options.go
@ -0,0 +1,78 @@
+package pdns
+
+import (
+	"crypto/tls"
+	"crypto/x509"
+	"github.com/mittwald/go-powerdns/pdnshttp"
+	"io"
+	"io/ioutil"
+	"net/http"
+)
+
+// WithBaseURL sets a client's base URL
+func WithBaseURL(baseURL string) ClientOption {
+	return func(c *client) error {
+		c.baseURL = baseURL
+		return nil
+	}
+}
+
+// WithHTTPClient can be used to override a client's HTTP client.
+// Otherwise, the default HTTP client will be used
+func WithHTTPClient(httpClient *http.Client) ClientOption {
+	return func(c *client) error {
+		c.httpClient = httpClient
+		return nil
+	}
+}
+
+// WithAPIKeyAuthentication adds API-key based authentication to the PowerDNS client.
+// In effect, each HTTP request will have an additional header that contains the API key
+// supplied to this function:
+//  X-API-Key: {{ key }}
+func WithAPIKeyAuthentication(key string) ClientOption {
+	return func(c *client) error {
+		c.authenticator = &pdnshttp.APIKeyAuthenticator{
+			APIKey: key,
+		}
+
+		return nil
+	}
+}
+
+// WithTLSAuthentication configures TLS-based authentication for the PowerDNS client.
+// This is not a feature that is provided by PowerDNS natively, but might be implemented
+// when the PowerDNS API is run behind a reverse proxy.
+func WithTLSAuthentication(caFile string, clientCertFile string, clientKeyFile string) ClientOption {
+	return func(c *client) error {
+		cert, err := tls.LoadX509KeyPair(clientCertFile, clientKeyFile)
+		if err != nil {
+			return err
+		}
+
+		caBytes, err := ioutil.ReadFile(caFile)
+		if err != nil {
+			return err
+		}
+
+		ca, err := x509.ParseCertificates(caBytes)
+
+		auth := pdnshttp.TLSClientCertificateAuthenticator{
+			ClientCert: cert,
+			ClientKey:  cert.PrivateKey,
+			CACerts:    ca,
+		}
+
+		c.authenticator = &auth
+		return nil
+	}
+}
+
+// WithDebuggingOutput can be used to supply an io.Writer to the client into which all
+// outgoing HTTP requests and their responses will be logged. Useful for debugging.
+func WithDebuggingOutput(out io.Writer) ClientOption {
+	return func(c *client) error {
+		c.debugOutput = out
+		return nil
+	}
+}
--- a/vendor/github.com/mittwald/go-powerdns/pdnshttp/auth.go
+++ b/vendor/github.com/mittwald/go-powerdns/pdnshttp/auth.go
@ -0,0 +1,24 @@
+package pdnshttp
+
+import (
+	"net/http"
+)
+
+type ClientAuthenticator interface {
+	OnRequest(*http.Request) error
+	OnConnect(*http.Client) error
+}
+
+// NoopAuthenticator provides an "empty" implementation of the
+// ClientAuthenticator interface.
+type NoopAuthenticator struct{}
+
+// OnRequest is applied each time a HTTP request is built.
+func (NoopAuthenticator) OnRequest(*http.Request) error {
+	return nil
+}
+
+// OnConnect is applied on the entire connection as soon as it is set up.
+func (NoopAuthenticator) OnConnect(*http.Client) error {
+	return nil
+}
--- a/vendor/github.com/mittwald/go-powerdns/pdnshttp/auth_key.go
+++ b/vendor/github.com/mittwald/go-powerdns/pdnshttp/auth_key.go
@ -0,0 +1,16 @@
+package pdnshttp
+
+import "net/http"
+
+type APIKeyAuthenticator struct {
+	APIKey string
+}
+
+func (a *APIKeyAuthenticator) OnRequest(r *http.Request) error {
+	r.Header.Set("X-API-Key", a.APIKey)
+	return nil
+}
+
+func (a *APIKeyAuthenticator) OnConnect(*http.Client) error {
+	return nil
+}
--- a/vendor/github.com/mittwald/go-powerdns/pdnshttp/auth_tls.go
+++ b/vendor/github.com/mittwald/go-powerdns/pdnshttp/auth_tls.go
@ -0,0 +1,55 @@
+package pdnshttp
+
+import (
+	"crypto"
+	"crypto/tls"
+	"crypto/x509"
+	"fmt"
+	"net/http"
+)
+
+type TLSClientCertificateAuthenticator struct {
+	CACerts    []*x509.Certificate
+	ClientCert tls.Certificate
+	ClientKey  crypto.PrivateKey
+}
+
+func (a *TLSClientCertificateAuthenticator) OnRequest(r *http.Request) error {
+	return nil
+}
+
+func (a *TLSClientCertificateAuthenticator) OnConnect(c *http.Client) error {
+	if c.Transport == nil {
+		c.Transport = http.DefaultTransport
+	}
+
+	t, ok := c.Transport.(*http.Transport)
+	if !ok {
+		return fmt.Errorf("client.Transport is no *http.Transport, instead %t", c.Transport)
+	}
+
+	if t.TLSClientConfig == nil {
+		t.TLSClientConfig = &tls.Config{}
+	}
+
+	if t.TLSClientConfig.Certificates == nil {
+		t.TLSClientConfig.Certificates = make([]tls.Certificate, 0, 1)
+	}
+
+	t.TLSClientConfig.Certificates = append(t.TLSClientConfig.Certificates, a.ClientCert)
+
+	if t.TLSClientConfig.RootCAs == nil {
+		systemPool, err := x509.SystemCertPool()
+		if err != nil {
+			return err
+		}
+
+		t.TLSClientConfig.RootCAs = systemPool
+	}
+
+	for i := range a.CACerts {
+		t.TLSClientConfig.RootCAs.AddCert(a.CACerts[i])
+	}
+
+	return nil
+}
--- a/vendor/github.com/mittwald/go-powerdns/pdnshttp/client.go
+++ b/vendor/github.com/mittwald/go-powerdns/pdnshttp/client.go
@ -0,0 +1,119 @@
+package pdnshttp
+
+import (
+	"context"
+	"encoding/json"
+	"io"
+	"net/http"
+	"net/http/httputil"
+	"strings"
+)
+
+type Client struct {
+	baseURL       string
+	httpClient    *http.Client
+	authenticator ClientAuthenticator
+	debugOutput   io.Writer
+}
+
+// NewClient returns a new PowerDNS HTTP client
+func NewClient(baseURL string, hc *http.Client, auth ClientAuthenticator, debugOutput io.Writer) *Client {
+	c := Client{
+		baseURL:       baseURL,
+		httpClient:    hc,
+		authenticator: auth,
+		debugOutput:   debugOutput,
+	}
+
+	return &c
+}
+
+// NewRequest builds a new request. Usually, this method should not be used;
+// prefer using the "Get", "Post", ... methods if possible.
+func (c *Client) NewRequest(method string, path string, body io.Reader) (*http.Request, error) {
+	path = strings.TrimPrefix(path, "/")
+	req, err := http.NewRequest(method, c.baseURL+"/"+path, body)
+	if err != nil {
+		return nil, err
+	}
+
+	if c.authenticator != nil {
+		if err := c.authenticator.OnRequest(req); err != nil {
+			return nil, err
+		}
+	}
+
+	return req, err
+}
+
+// Get executes a GET request
+func (c *Client) Get(ctx context.Context, path string, out interface{}, opts ...RequestOption) error {
+	return c.doRequest(ctx, http.MethodGet, path, out, opts...)
+}
+
+// Post executes a POST request
+func (c *Client) Post(ctx context.Context, path string, out interface{}, opts ...RequestOption) error {
+	return c.doRequest(ctx, http.MethodPost, path, out, opts...)
+}
+
+// Put executes a PUT request
+func (c *Client) Put(ctx context.Context, path string, out interface{}, opts ...RequestOption) error {
+	return c.doRequest(ctx, http.MethodPut, path, out, opts...)
+}
+
+// Patch executes a PATCH request
+func (c *Client) Patch(ctx context.Context, path string, out interface{}, opts ...RequestOption) error {
+	return c.doRequest(ctx, http.MethodPatch, path, out, opts...)
+}
+
+// Delete executes a DELETE request
+func (c *Client) Delete(ctx context.Context, path string, out interface{}, opts ...RequestOption) error {
+	return c.doRequest(ctx, http.MethodDelete, path, out, opts...)
+}
+
+func (c *Client) doRequest(ctx context.Context, method string, path string, out interface{}, opts ...RequestOption) error {
+	req, err := c.NewRequest(method, path, nil)
+	if err != nil {
+		return err
+	}
+
+	for i := range opts {
+		if err := opts[i](req); err != nil {
+			return err
+		}
+	}
+
+	req = req.WithContext(ctx)
+
+	reqDump, _ := httputil.DumpRequestOut(req, true)
+	c.debugOutput.Write(reqDump)
+
+	res, err := c.httpClient.Do(req)
+	if err != nil {
+		return err
+	}
+
+	resDump, _ := httputil.DumpResponse(res, true)
+	c.debugOutput.Write(resDump)
+
+	if res.StatusCode == http.StatusNotFound {
+		return ErrNotFound{URL: req.URL.String()}
+	} else if res.StatusCode >= 400 {
+		return ErrUnexpectedStatus{URL: req.URL.String(), StatusCode: res.StatusCode}
+	}
+
+	if out != nil {
+		if w, ok := out.(io.Writer); ok {
+			_, err := io.Copy(w, res.Body)
+			return err
+		}
+
+		dec := json.NewDecoder(res.Body)
+		err = dec.Decode(out)
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
--- a/vendor/github.com/mittwald/go-powerdns/pdnshttp/errors.go
+++ b/vendor/github.com/mittwald/go-powerdns/pdnshttp/errors.go
@ -0,0 +1,31 @@
+package pdnshttp
+
+import "fmt"
+
+type ErrNotFound struct {
+	URL string
+}
+
+func (e ErrNotFound) Error() string {
+	return fmt.Sprintf("not found: %s", e.URL)
+}
+
+type ErrUnexpectedStatus struct {
+	URL        string
+	StatusCode int
+}
+
+func (e ErrUnexpectedStatus) Error() string {
+	return fmt.Sprintf("unexpected status code %d: %s", e.StatusCode, e.URL)
+}
+
+func IsNotFound(err error) bool {
+	switch err.(type) {
+	case ErrNotFound:
+		return true
+	case *ErrNotFound:
+		return true
+	}
+
+	return false
+}
--- a/vendor/github.com/mittwald/go-powerdns/pdnshttp/req_opt.go
+++ b/vendor/github.com/mittwald/go-powerdns/pdnshttp/req_opt.go
@ -0,0 +1,58 @@
+package pdnshttp
+
+import (
+	"bytes"
+	"encoding/json"
+	"io"
+	"io/ioutil"
+	"net/http"
+)
+
+// RequestOption is a special type of function that can be passed to most HTTP
+// request functions in this package; it is used to modify an HTTP request and
+// to implement special request logic.
+type RequestOption func(*http.Request) error
+
+// WithJSONRequestBody adds a JSON body to a request. The input type can be
+// anything, as long as it can be marshaled by "json.Marshal". This method will
+// also automatically set the correct content type and content-length.
+func WithJSONRequestBody(in interface{}) RequestOption {
+	return func(req *http.Request) error {
+		if in == nil {
+			return nil
+		}
+
+		buf := bytes.Buffer{}
+		enc := json.NewEncoder(&buf)
+		err := enc.Encode(in)
+
+		if err != nil {
+			return err
+		}
+
+		rc := ioutil.NopCloser(&buf)
+
+		copyBuf := buf.Bytes()
+
+		req.Body = rc
+		req.Header.Set("Content-Type", "application/json")
+		req.ContentLength = int64(buf.Len())
+		req.GetBody = func() (io.ReadCloser, error) {
+			r := bytes.NewReader(copyBuf)
+			return ioutil.NopCloser(r), nil
+		}
+
+		return nil
+	}
+}
+
+// WithQueryValue adds a query parameter to a request's URL.
+func WithQueryValue(key, value string) RequestOption {
+	return func(req *http.Request) error {
+		q := req.URL.Query()
+		q.Set(key, value)
+
+		req.URL.RawQuery = q.Encode()
+		return nil
+	}
+}
--- a/vendor/modules.txt
+++ b/vendor/modules.txt
@ -211,6 +211,14 @@ github.com/miekg/dns/dnsutil
 github.com/mitchellh/go-homedir
 # github.com/mitchellh/mapstructure v1.1.2
 github.com/mitchellh/mapstructure
+# github.com/mittwald/go-powerdns v0.4.0
+## explicit
+github.com/mittwald/go-powerdns
+github.com/mittwald/go-powerdns/apis/cache
+github.com/mittwald/go-powerdns/apis/search
+github.com/mittwald/go-powerdns/apis/servers
+github.com/mittwald/go-powerdns/apis/zones
+github.com/mittwald/go-powerdns/pdnshttp
 # github.com/mjibson/esc v0.2.0
 ## explicit
 github.com/mjibson/esc/embed