Add support for TXT records with multiple strings (BIND, ROUTE53) (#293)

* BIND: Support TXT records with multiple strings (#289)
* ROUTE53: Add support for TXT records with multiple strings (#292)

docs/_functions/domain/TXT.md

@@ -9,10 +9,14 @@ parameters:
 TXT adds an TXT record To a domain. The name should be the relative
 label for the record. Use `@` for the domain apex.
 
-The contents is a single string.  While DNS permits multiple
+The contents is either a single or multiple strings.  To
-strings in TXT records, that is not supported at this time.
+specify multiple strings, include them in an array.
 
-The string is a JavaScript string (quoted using single or double
+TXT records with multiple strings are only supported by some
+providers. DNSControl will produce a validation error if the
+provider does not support multiple strings.
+
+Each string is a JavaScript string (quoted using single or double
 quotes).  The (somewhat complex) quoting rules of the DNS protocol
 will be done for you.
 
@@ -24,6 +28,9 @@ Modifers can be any number of [record modifiers](#record-modifiers) or json obje
 D("example.com", REGISTRAR, ....,
   TXT('@', '598611146-3338560'),
   TXT('listserve', 'google-site-verification=12345'),
+  TXT('multiple', ['one', 'two', 'three']),  // Multiple strings
+  TXT('quoted', 'any "quotes" and escapes? ugh; no worries!'),
+  TXT('_domainkey', 't=y; o=-;') // Escapes are done for you automatically.
 );
 
 {%endhighlight%}

integrationTest/integration_test.go

@@ -112,7 +112,7 @@ func runTests(t *testing.T, prv providers.DNSServiceProvider, domainName string,
 				}
 				dom.Records = append(dom.Records, &rc)
 			}
-			models.Downcase(dom.Records)
+			models.PostProcessRecords(dom.Records)
 			dom2, _ := dom.Copy()
 			// get corrections for first time
 			corrections, err := prv.GetDomainCorrections(dom)
@@ -237,7 +237,17 @@ func srv(name string, priority, weight, port uint16, target string) *rec {
 }
 
 func txt(name, target string) *rec {
-	return makeRec(name, target, "TXT")
+	// FYI: This must match the algorithm in pkg/js/helpers.js TXT.
+	r := makeRec(name, target, "TXT")
+	r.TxtStrings = []string{target}
+	return r
+}
+
+func txtmulti(name string, target []string) *rec {
+	// FYI: This must match the algorithm in pkg/js/helpers.js TXT.
+	r := makeRec(name, target[0], "TXT")
+	r.TxtStrings = target
+	return r
 }
 
 func caa(name string, tag string, flag uint8, target string) *rec {
@@ -427,15 +437,42 @@ func makeTests(t *testing.T) []*TestCase {
 		)
 	}
 
-	// Case
+	// TXT (single)
 	tests = append(tests, tc("Empty"),
-		// TXT
 		tc("Empty"),
 		tc("Create a TXT", txt("foo", "simple")),
 		tc("Change a TXT", txt("foo", "changed")),
+		tc("Empty"),
 		tc("Create a TXT with spaces", txt("foo", "with spaces")),
 		tc("Change a TXT with spaces", txt("foo", "with whitespace")),
+		tc("Create 1 TXT as array", txtmulti("foo", []string{"simple"})),
 	)
 
+	// TXTMulti
+	if !providers.ProviderHasCabability(*providerToRun, providers.CanUseTXTMulti) {
+		t.Log("Skipping TXTMulti Tests because provider does not support them")
+	} else {
+		tests = append(tests,
+			tc("Empty"),
+			tc("Create TXTMulti 1",
+				txtmulti("foo1", []string{"simple"}),
+			),
+			tc("Create TXTMulti 2",
+				txtmulti("foo1", []string{"simple"}),
+				txtmulti("foo2", []string{"one", "two"}),
+			),
+			tc("Create TXTMulti 3",
+				txtmulti("foo1", []string{"simple"}),
+				txtmulti("foo2", []string{"one", "two"}),
+				txtmulti("foo3", []string{"eh", "bee", "cee"}),
+			),
+			tc("Change TXTMulti",
+				txtmulti("foo1", []string{"dimple"}),
+				txtmulti("foo2", []string{"fun", "two"}),
+				txtmulti("foo3", []string{"eh", "bzz", "cee"}),
+			),
+		)
+	}
+
 	return tests
 }

integrationTest/zones/example.com.zone

@@ -1,4 +1,4 @@
 $TTL 300
-@                IN SOA   DEFAULT_NOT_SET. DEFAULT_NOT_SET. 2017091830 3600 600 604800 1440
+@                IN SOA   DEFAULT_NOT_SET. DEFAULT_NOT_SET. 2018010281 3600 600 604800 1440
                  IN NS    ns1.otherdomain.tld.
                  IN NS    ns2.otherdomain.tld.

models/dns.go

@@ -101,6 +101,7 @@ type RecordConfig struct {
 	TlsaUsage        uint8             `json:"tlsausage,omitempty"`
 	TlsaSelector     uint8             `json:"tlsaselector,omitempty"`
 	TlsaMatchingType uint8             `json:"tlsamatchingtype,omitempty"`
+	TxtStrings       []string          `json:"txtstrings,omitempty"` // TxtStrings stores all strings (including the first). Target stores only the first one.
 
 	CombinedTarget bool `json:"-"`
 
@@ -247,7 +248,7 @@ func (rc *RecordConfig) ToRR() dns.RR {
 		rr.(*dns.TLSA).Selector = rc.TlsaSelector
 		rr.(*dns.TLSA).Certificate = rc.Target
 	case dns.TypeTXT:
-		rr.(*dns.TXT).Txt = []string{rc.Target}
+		rr.(*dns.TXT).Txt = rc.TxtStrings
 	default:
 		panic(fmt.Sprintf("ToRR: Unimplemented rtype %v", rc.Type))
 		// We panic so that we quickly find any switch statements
@@ -275,6 +276,12 @@ func (r Records) Grouped() map[RecordKey]Records {
 	return groups
 }
 
+// PostProcessRecords does any post-processing of the downloaded DNS records.
+func PostProcessRecords(recs []*RecordConfig) {
+	Downcase(recs)
+	fixTxt(recs)
+}
+
 // Downcase converts all labels and targets to lowercase in a list of RecordConfig.
 func Downcase(recs []*RecordConfig) {
 	for _, r := range recs {
@@ -292,6 +299,17 @@ func Downcase(recs []*RecordConfig) {
 	return
 }
 
+// fixTxt fixes TXT records generated by providers that do not understand CanUseTXTMulti.
+func fixTxt(recs []*RecordConfig) {
+	for _, r := range recs {
+		if r.Type == "TXT" {
+			if len(r.TxtStrings) == 0 {
+				r.TxtStrings = []string{r.Target}
+			}
+		}
+	}
+}
+
 type RecordKey struct {
 	Name string
 	Type string
@@ -453,7 +471,6 @@ func (dc *DomainConfig) CombineCAAs() {
 				panic(pm)
 			}
 			rec.Target = rec.Content()
-			fmt.Printf("DEBUG: NEW TARGET: %v\n", rec.Target)
 			rec.CombinedTarget = true
 		}
 	}

models/txt.go

@@ -0,0 +1,57 @@
+package models
+
+import "strings"
+
+// SetTxt sets the value of a TXT record to s.
+func (rc *RecordConfig) SetTxt(s string) {
+	rc.Target = s
+	rc.TxtStrings = []string{s}
+}
+
+// SetTxts sets the value of a TXT record to the list of strings s.
+func (rc *RecordConfig) SetTxts(s []string) {
+	rc.Target = s[0]
+	rc.TxtStrings = s
+}
+
+// SetTxtParse sets the value of TXT record if the list of strings is combined into one string.
+// `foo`  -> []string{"foo"}
+// `"foo"` -> []string{"foo"}
+// `"foo" "bar"` -> []string{"foo" "bar"}
+func (rc *RecordConfig) SetTxtParse(s string) {
+	rc.SetTxts(ParseQuotedTxt(s))
+}
+
+// IsQuoted returns true if the string starts and ends with a double quote.
+func IsQuoted(s string) bool {
+	if s == "" {
+		return false
+	}
+	if len(s) < 2 {
+		return false
+	}
+	if s[0] == '"' && s[len(s)-1] == s[0] {
+		return true
+	}
+	return false
+}
+
+// StripQuotes returns the string with the starting and ending quotes removed.
+func StripQuotes(s string) string {
+	if IsQuoted(s) {
+		return s[1 : len(s)-1]
+	}
+	return s
+}
+
+// ParseQuotedTxt returns the individual strings of a combined quoted string.
+// `foo`  -> []string{"foo"}
+// `"foo"` -> []string{"foo"}
+// `"foo" "bar"` -> []string{"foo" "bar"}
+// NOTE: it is assumed there is exactly one space between the quotes.
+func ParseQuotedTxt(s string) []string {
+	if !IsQuoted(s) {
+		return []string{s}
+	}
+	return strings.Split(StripQuotes(s), `" "`)
+}

models/txt_test.go

@@ -0,0 +1,71 @@
+package models
+
+import (
+	"testing"
+)
+
+func TestIsQuoted(t *testing.T) {
+	tests := []struct {
+		d1 string
+		e1 bool
+	}{
+		{``, false},
+		{`foo`, false},
+		{`""`, true},
+		{`"a"`, true},
+		{`"bb"`, true},
+		{`"ccc"`, true},
+		{`"aaa" "bbb"`, true},
+	}
+	for i, test := range tests {
+		r := IsQuoted(test.d1)
+		if r != test.e1 {
+			t.Errorf("%v: expected (%v) got (%v)", i, test.e1, r)
+		}
+	}
+}
+
+func TestStripQuotes(t *testing.T) {
+	tests := []struct {
+		d1 string
+		e1 string
+	}{
+		{``, ``},
+		{`a`, `a`},
+		{`bb`, `bb`},
+		{`ccc`, `ccc`},
+		{`dddd`, `dddd`},
+		{`"A"`, `A`},
+		{`"BB"`, `BB`},
+		{`"CCC"`, `CCC`},
+		{`"DDDD"`, `DDDD`},
+		{`"EEEEE"`, `EEEEE`},
+		{`"aaa" "bbb"`, `aaa" "bbb`},
+	}
+	for i, test := range tests {
+		r := StripQuotes(test.d1)
+		if r != test.e1 {
+			t.Errorf("%v: expected (%v) got (%v)", i, test.e1, r)
+		}
+	}
+}
+
+func TestSetTxtParse(t *testing.T) {
+	tests := []struct {
+		d1 string
+		e1 string
+		e2 []string
+	}{
+		{``, ``, []string{``}},
+		{`foo`, `foo`, []string{`foo`}},
+		{`"foo"`, `foo`, []string{`foo`}},
+		{`"aaa" "bbb"`, `aaa`, []string{`aaa`, `bbb`}},
+	}
+	for i, test := range tests {
+		x := &RecordConfig{Type: "TXT"}
+		x.SetTxtParse(test.d1)
+		if x.Target != test.e1 {
+			t.Errorf("%v: expected Target=(%v) got (%v)", i, test.e1, x.Target)
+		}
+	}
+}

pkg/js/helpers.js

@@ -220,8 +220,32 @@ var TLSA = recordBuilder('TLSA', {
     },
 });
 
+function isStringOrArray(x) {
+  return _.isString(x) || _.isArray(x);
+}
+
 // TXT(name,target, recordModifiers...)
-var TXT = recordBuilder('TXT');
+var TXT = recordBuilder("TXT", {
+  args: [["name", _.isString], ["target", isStringOrArray]],
+  transform: function(record, args, modifiers) {
+    record.name = args.name;
+    // Store the strings twice:
+    //   .target is the first string
+    //   .txtstrings is the individual strings.
+    //   NOTE: If there are more than 1 string, providers should only access
+    //   .txtstrings, thus it doesn't matter what we store in .target.
+    //   However, by storing the first string there, it improves backwards
+    //   compatibility when the len(array) == 1 and (intentionally) breaks
+    //   broken providers early in the integration tests.
+    if (_.isString(args.target)) {
+      record.target = args.target;
+      record.txtstrings = [args.target];
+    } else {
+      record.target = args.target[0]
+      record.txtstrings = args.target;
+    }
+  }
+});
 
 // MX(name,priority,target, recordModifiers...)
 var MX = recordBuilder('MX', {

pkg/js/parse_tests/016-backslash.json

@@ -11,7 +11,8 @@
                     "type": "TXT",
                     "name": "_dmarc",
                     "target": "v=DMARC1\\; p=reject\\; sp=reject\\; pct=100\\; rua=mailto:xx...@yyyy.com\\; ruf=mailto:xx...@yyyy.com\\; fo=1",
-                    "ttl": 300
+                    "ttl": 300,
+                    "txtstrings":["v=DMARC1\\; p=reject\\; sp=reject\\; pct=100\\; rua=mailto:xx...@yyyy.com\\; ruf=mailto:xx...@yyyy.com\\; fo=1"]
                 }
             ]
         }

pkg/js/parse_tests/017-txt.js

@@ -0,0 +1,6 @@
+D("foo.com","none"
+  , TXT("@","simple")
+  , TXT("@",["one"])
+  , TXT("@",["bonie", "clyde"])
+  , TXT("@",["straw", "wood", "brick"])
+);

pkg/js/parse_tests/017-txt.json

@@ -0,0 +1,37 @@
+{
+  "registrars": [],
+  "dns_providers": [],
+  "domains": [
+    {
+      "name": "foo.com",
+      "registrar": "none",
+      "dnsProviders": {},
+      "records": [
+        {
+          "type": "TXT",
+          "name": "@",
+          "target": "simple",
+          "txtstrings": [ "simple" ]
+        },
+        {
+          "type": "TXT",
+          "name": "@",
+          "target": "one",
+          "txtstrings": [ "one" ]
+        },
+        {
+          "type": "TXT",
+          "name": "@",
+          "target": "bonie",
+          "txtstrings": [ "bonie", "clyde" ]
+        },
+        {
+          "type": "TXT",
+          "name": "@",
+          "target": "straw",
+          "txtstrings": [ "straw", "wood", "brick" ]
+        }
+      ]
+    }
+  ]
+}

pkg/js/static.go

@@ -192,83 +192,88 @@ var _escData = map[string]*_escFile{
 
 	"/helpers.js": {
 		local:   "pkg/js/helpers.js",
-		size:    16222,
+		size:    17122,
 		modtime: 0,
 		compressed: `
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 `,
 	},
 

pkg/normalize/flatten.go

@@ -35,7 +35,7 @@ func flattenSPFs(cfg *models.DNSConfig) []error {
 			}
 			if flatten, ok := txt.Metadata["flatten"]; ok && strings.HasPrefix(txt.Target, "v=spf1") {
 				rec = rec.Flatten(flatten)
-				txt.Target = rec.TXT()
+				txt.SetTxt(rec.TXT())
 			}
 			// now split if needed
 			if split, ok := txt.Metadata["split"]; ok {
@@ -46,10 +46,10 @@ func flattenSPFs(cfg *models.DNSConfig) []error {
 				recs := rec.TXTSplit(split + "." + domain.Name)
 				for k, v := range recs {
 					if k == "@" {
-						txt.Target = v
+						txt.SetTxt(v)
 					} else {
 						cp, _ := txt.Copy()
-						cp.Target = v
+						cp.SetTxt(v)
 						cp.NameFQDN = k
 						cp.Name = dnsutil.TrimDomainName(k, domain.Name)
 						domain.Records = append(domain.Records, cp)

pkg/normalize/validate.go

@@ -252,6 +252,7 @@ func NormalizeAndValidateConfig(config *models.DNSConfig) (errs []error) {
 
 	for _, domain := range config.Domains {
 		pTypes := []string{}
+		txtMultiDissenters := []string{}
 		for p := range domain.DNSProviders {
 			pType, ok := ptypeMap[p]
 			if !ok {
@@ -264,6 +265,11 @@ func NormalizeAndValidateConfig(config *models.DNSConfig) (errs []error) {
 			if domain.KeepUnknown && providers.ProviderHasCabability(pType, providers.CantUseNOPURGE) {
 				errs = append(errs, fmt.Errorf("%s uses NO_PURGE which is not supported by %s(%s)", domain.Name, p, pType))
 			}
+
+			// Record if any providers do not support TXTMulti:
+			if !providers.ProviderHasCabability(pType, providers.CanUseTXTMulti) {
+				txtMultiDissenters = append(txtMultiDissenters, p)
+			}
 		}
 
 		// Normalize Nameservers.
@@ -272,7 +278,7 @@ func NormalizeAndValidateConfig(config *models.DNSConfig) (errs []error) {
 			ns.Name = strings.TrimRight(ns.Name, ".")
 		}
 		// Normalize Records.
-		models.Downcase(domain.Records)
+		models.PostProcessRecords(domain.Records)
 		for _, rec := range domain.Records {
 			if rec.TTL == 0 {
 				rec.TTL = models.DefaultTTL
@@ -315,6 +321,12 @@ func NormalizeAndValidateConfig(config *models.DNSConfig) (errs []error) {
 					errs = append(errs, fmt.Errorf("TLSA MatchingType %d is invalid in record %s (domain %s)",
 						rec.TlsaMatchingType, rec.Name, domain.Name))
 				}
+			} else if rec.Type == "TXT" && len(txtMultiDissenters) != 0 && len(rec.TxtStrings) > 1 {
+				// There are providers that  don't support TXTMulti yet there is
+				// a TXT record with multiple strings:
+				errs = append(errs,
+					fmt.Errorf("TXT records with multiple strings (label %v domain: %v) not supported by %s",
+						rec.Name, domain.Name, strings.Join(txtMultiDissenters, ",")))
 			}
 
 			// Populate FQDN:

providers/activedir/activedirProvider.go

@@ -16,20 +16,20 @@ type adProvider struct {
 	psLog    string
 }
 
-var docNotes = providers.DocumentationNotes{
+var features = providers.DocumentationNotes{
-	providers.DocDualHost:            providers.Cannot("This driver does not manage NS records, so should not be used for dual-host scenarios"),
-	providers.DocCreateDomains:       providers.Cannot("AD depends on the zone already existing on the dns server"),
-	providers.DocOfficiallySupported: providers.Can(),
 	providers.CanUseAlias:            providers.Cannot(),
-	providers.CanUseSRV:              providers.Cannot(),
-	providers.CanUsePTR:              providers.Cannot(),
 	providers.CanUseCAA:              providers.Cannot(),
+	providers.CanUsePTR:              providers.Cannot(),
+	providers.CanUseSRV:              providers.Cannot(),
+	providers.DocCreateDomains:       providers.Cannot("AD depends on the zone already existing on the dns server"),
+	providers.DocDualHost:            providers.Cannot("This driver does not manage NS records, so should not be used for dual-host scenarios"),
+	providers.DocOfficiallySupported: providers.Can(),
 }
 
 // Register with the dnscontrol system.
 //   This establishes the name (all caps), and the function to call to initialize it.
 func init() {
-	providers.RegisterDomainServiceProviderType("ACTIVEDIRECTORY_PS", newDNS, docNotes)
+	providers.RegisterDomainServiceProviderType("ACTIVEDIRECTORY_PS", newDNS, features)
 }
 
 func newDNS(config map[string]string, metadata json.RawMessage) (providers.DNSServiceProvider, error) {

providers/activedir/domains.go

@@ -47,7 +47,7 @@ func (c *adProvider) GetDomainCorrections(dc *models.DomainConfig) ([]*models.Co
 	}
 
 	// Normalize
-	models.Downcase(foundRecords)
+	models.PostProcessRecords(foundRecords)
 
 	differ := diff.New(dc)
 	_, creates, dels, modifications := differ.IncrementalDiff(foundRecords)

providers/bind/bindProvider.go

@@ -30,9 +30,15 @@ import (
 	"github.com/StackExchange/dnscontrol/providers/diff"
 )
 
-var docNotes = providers.DocumentationNotes{
+var features = providers.DocumentationNotes{
-	providers.DocDualHost:            providers.Can(),
+	providers.CanUseCAA:              providers.Can(),
+	providers.CanUsePTR:              providers.Can(),
+	providers.CanUseSRV:              providers.Can(),
+	providers.CanUseTLSA:             providers.Can(),
+	providers.CanUseTXTMulti:         providers.Can(),
+	providers.CantUseNOPURGE:         providers.Cannot(),
 	providers.DocCreateDomains:       providers.Can("Driver just maintains list of zone files. It should automatically add missing ones."),
+	providers.DocDualHost:            providers.Can(),
 	providers.DocOfficiallySupported: providers.Can(),
 }
 
@@ -56,13 +62,7 @@ func initBind(config map[string]string, providermeta json.RawMessage) (providers
 }
 
 func init() {
-	providers.RegisterDomainServiceProviderType("BIND", initBind,
+	providers.RegisterDomainServiceProviderType("BIND", initBind, features)
-		providers.CanUsePTR,
-		providers.CanUseSRV,
-		providers.CanUseCAA,
-		providers.CanUseTLSA,
-		providers.CantUseNOPURGE,
-		docNotes)
 }
 
 type SoaInfo struct {
@@ -144,6 +144,7 @@ func rrToRecord(rr dns.RR, origin string, replaceSerial uint32) (models.RecordCo
 		rc.Target = v.Certificate
 	case *dns.TXT:
 		rc.Target = strings.Join(v.Txt, " ")
+		rc.TxtStrings = v.Txt
 	default:
 		log.Fatalf("rrToRecord: Unimplemented zone record type=%s (%v)\n", rc.Type, rr)
 	}
@@ -243,7 +244,7 @@ func (c *Bind) GetDomainCorrections(dc *models.DomainConfig) ([]*models.Correcti
 	}
 
 	// Normalize
-	models.Downcase(foundRecords)
+	models.PostProcessRecords(foundRecords)
 
 	differ := diff.New(dc)
 	_, create, del, mod := differ.IncrementalDiff(foundRecords)

providers/capabilities.go

@@ -19,6 +19,9 @@ const (
 	// CanUseSRV indicates the provider can handle SRV records
 	CanUseSRV
 
+	// CanUseTXTMulti indicates the provider can handle TXT records with multiple strings
+	CanUseTXTMulti
+
 	// CanUseCAA indicates the provider can handle CAA records
 	CanUseCAA
 
@@ -66,12 +69,12 @@ type ProviderMetadata interface{}
 var Notes = map[string]DocumentationNotes{}
 
 func unwrapProviderCapabilities(pName string, meta []ProviderMetadata) {
-	for _, pm := range meta {
-		switch x := pm.(type) {
-		case Capability:
 	if providerCapabilities[pName] == nil {
 		providerCapabilities[pName] = map[Capability]bool{}
 	}
+	for _, pm := range meta {
+		switch x := pm.(type) {
+		case Capability:
 			providerCapabilities[pName][x] = true
 		case DocumentationNotes:
 			if Notes[pName] == nil {
@@ -79,6 +82,7 @@ func unwrapProviderCapabilities(pName string, meta []ProviderMetadata) {
 			}
 			for k, v := range x {
 				Notes[pName][k] = v
+				providerCapabilities[pName][k] = v.HasFeature
 			}
 		default:
 			log.Fatalf("Unrecognized ProviderMetadata type: %T", pm)

providers/cloudflare/cloudflareProvider.go

@@ -33,15 +33,17 @@ Domain level metadata available:
    - ip_conversions
 */
 
-var docNotes = providers.DocumentationNotes{
+var features = providers.DocumentationNotes{
-	providers.DocDualHost:            providers.Cannot("Cloudflare will not work well in situations where it is not the only DNS server"),
-	providers.DocCreateDomains:       providers.Can(),
-	providers.DocOfficiallySupported: providers.Can(),
 	providers.CanUseAlias:            providers.Can("CF automatically flattens CNAME records into A records dynamically"),
+	providers.CanUseCAA:              providers.Can(),
+	providers.CanUseSRV:              providers.Can(),
+	providers.DocCreateDomains:       providers.Can(),
+	providers.DocDualHost:            providers.Cannot("Cloudflare will not work well in situations where it is not the only DNS server"),
+	providers.DocOfficiallySupported: providers.Can(),
 }
 
 func init() {
-	providers.RegisterDomainServiceProviderType("CLOUDFLAREAPI", newCloudflare, providers.CanUseSRV, providers.CanUseAlias, providers.CanUseCAA, docNotes)
+	providers.RegisterDomainServiceProviderType("CLOUDFLAREAPI", newCloudflare, features)
 	providers.RegisterCustomRecordType("CF_REDIRECT", "CLOUDFLAREAPI", "")
 	providers.RegisterCustomRecordType("CF_TEMP_REDIRECT", "CLOUDFLAREAPI", "")
 }
@@ -122,7 +124,7 @@ func (c *CloudflareApi) GetDomainCorrections(dc *models.DomainConfig) ([]*models
 	checkNSModifications(dc)
 
 	// Normalize
-	models.Downcase(records)
+	models.PostProcessRecords(records)
 
 	differ := diff.New(dc, getProxyMetadata)
 	_, create, del, mod := differ.IncrementalDiff(records)

providers/digitalocean/digitaloceanProvider.go

@@ -60,13 +60,14 @@ func NewDo(m map[string]string, metadata json.RawMessage) (providers.DNSServiceP
 	return api, nil
 }
 
-var docNotes = providers.DocumentationNotes{
+var features = providers.DocumentationNotes{
 	providers.DocCreateDomains:       providers.Can(),
 	providers.DocOfficiallySupported: providers.Cannot(),
+	providers.CanUseSRV:              providers.Can(),
 }
 
 func init() {
-	providers.RegisterDomainServiceProviderType("DIGITALOCEAN", NewDo, providers.CanUseSRV, docNotes)
+	providers.RegisterDomainServiceProviderType("DIGITALOCEAN", NewDo, features)
 }
 
 func (api *DoApi) EnsureDomainExists(domain string) error {
@@ -102,7 +103,7 @@ func (api *DoApi) GetDomainCorrections(dc *models.DomainConfig) ([]*models.Corre
 	}
 
 	// Normalize
-	models.Downcase(existingRecords)
+	models.PostProcessRecords(existingRecords)
 
 	differ := diff.New(dc)
 	_, create, delete, modify := differ.IncrementalDiff(existingRecords)

providers/dnsimple/dnsimpleProvider.go

@@ -15,16 +15,20 @@ import (
 	dnsimpleapi "github.com/dnsimple/dnsimple-go/dnsimple"
 )
 
-var docNotes = providers.DocumentationNotes{
+var features = providers.DocumentationNotes{
-	providers.DocDualHost:            providers.Cannot("DNSimple does not allow sufficient control over the apex NS records"),
+	providers.CanUseAlias:            providers.Can(),
-	providers.DocCreateDomains:       providers.Cannot(),
+	providers.CanUseCAA:              providers.Can(),
-	providers.DocOfficiallySupported: providers.Cannot(),
+	providers.CanUsePTR:              providers.Can(),
+	providers.CanUseSRV:              providers.Can(),
 	providers.CanUseTLSA:             providers.Cannot(),
+	providers.DocCreateDomains:       providers.Cannot(),
+	providers.DocDualHost:            providers.Cannot("DNSimple does not allow sufficient control over the apex NS records"),
+	providers.DocOfficiallySupported: providers.Cannot(),
 }
 
 func init() {
 	providers.RegisterRegistrarType("DNSIMPLE", newReg)
-	providers.RegisterDomainServiceProviderType("DNSIMPLE", newDsp, providers.CanUsePTR, providers.CanUseAlias, providers.CanUseCAA, providers.CanUseSRV, docNotes)
+	providers.RegisterDomainServiceProviderType("DNSIMPLE", newDsp, features)
 }
 
 const stateRegistered = "registered"
@@ -92,7 +96,7 @@ func (c *DnsimpleApi) GetDomainCorrections(dc *models.DomainConfig) ([]*models.C
 	})
 
 	// Normalize
-	models.Downcase(actual)
+	models.PostProcessRecords(actual)
 
 	differ := diff.New(dc)
 	_, create, delete, modify := differ.IncrementalDiff(actual)

providers/gandi/gandiProvider.go

@@ -26,19 +26,17 @@ Info required in `creds.json`:
 
 */
 
-var docNotes = providers.DocumentationNotes{
+var features = providers.DocumentationNotes{
+	providers.CanUseCAA:              providers.Can(),
+	providers.CanUsePTR:              providers.Can(),
+	providers.CanUseSRV:              providers.Can(),
+	providers.CantUseNOPURGE:         providers.Cannot(),
 	providers.DocCreateDomains:       providers.Cannot("Can only manage domains registered through their service"),
 	providers.DocOfficiallySupported: providers.Cannot(),
 }
 
 func init() {
-	providers.RegisterDomainServiceProviderType("GANDI", newDsp,
+	providers.RegisterDomainServiceProviderType("GANDI", newDsp, features)
-		providers.CanUseCAA,
-		providers.CanUsePTR,
-		providers.CanUseSRV,
-		providers.CantUseNOPURGE,
-		docNotes,
-	)
 	providers.RegisterRegistrarType("GANDI", newReg)
 }
 
@@ -121,7 +119,7 @@ func (c *GandiApi) GetDomainCorrections(dc *models.DomainConfig) ([]*models.Corr
 	dc.Records = recordsToKeep
 
 	// Normalize
-	models.Downcase(foundRecords)
+	models.PostProcessRecords(foundRecords)
 
 	differ := diff.New(dc)
 	_, create, del, mod := differ.IncrementalDiff(foundRecords)

providers/gandi/protocol.go

@@ -192,8 +192,10 @@ func convert(r *gandirecord.RecordInfo, origin string) *models.RecordConfig {
 		TTL:      uint32(r.Ttl),
 	}
 	switch r.Type {
-	case "A", "AAAA", "NS", "CNAME", "PTR", "TXT":
+	case "A", "AAAA", "NS", "CNAME", "PTR":
 		// no-op
+	case "TXT":
+		rc.SetTxtParse(r.Value)
 	case "CAA":
 		var err error
 		rc.CaaTag, rc.CaaFlag, rc.Target, err = models.SplitCombinedCaaValue(r.Value)

providers/gcloud/gcloudProvider.go

@@ -14,14 +14,17 @@ import (
 	"github.com/StackExchange/dnscontrol/providers/diff"
 )
 
-var docNotes = providers.DocumentationNotes{
+var features = providers.DocumentationNotes{
-	providers.DocDualHost:            providers.Can(),
 	providers.DocCreateDomains:       providers.Can(),
+	providers.DocDualHost:            providers.Can(),
 	providers.DocOfficiallySupported: providers.Can(),
+	providers.CanUsePTR:              providers.Can(),
+	providers.CanUseSRV:              providers.Can(),
+	providers.CanUseCAA:              providers.Can(),
 }
 
 func init() {
-	providers.RegisterDomainServiceProviderType("GCLOUD", New, providers.CanUsePTR, providers.CanUseSRV, providers.CanUseCAA, docNotes)
+	providers.RegisterDomainServiceProviderType("GCLOUD", New, features)
 }
 
 type gcloud struct {
@@ -137,7 +140,7 @@ func (g *gcloud) GetDomainCorrections(dc *models.DomainConfig) ([]*models.Correc
 	}
 
 	// Normalize
-	models.Downcase(existingRecords)
+	models.PostProcessRecords(existingRecords)
 
 	// first collect keys that have changed
 	differ := diff.New(dc)

providers/linode/linodeProvider.go

@@ -13,9 +13,10 @@ import (
 
 	"net/url"
 
-	"golang.org/x/oauth2"
 	"regexp"
 	"strings"
+
+	"golang.org/x/oauth2"
 )
 
 /*
@@ -84,14 +85,14 @@ func NewLinode(m map[string]string, metadata json.RawMessage) (providers.DNSServ
 	return api, nil
 }
 
-var docNotes = providers.DocumentationNotes{
+var features = providers.DocumentationNotes{
-	providers.DocOfficiallySupported: providers.Cannot(),
 	providers.DocDualHost:            providers.Cannot(),
+	providers.DocOfficiallySupported: providers.Cannot(),
 }
 
 func init() {
 	// SRV support is in this provider, but Linode doesn't seem to support it properly
-	providers.RegisterDomainServiceProviderType("LINODE", NewLinode, docNotes)
+	providers.RegisterDomainServiceProviderType("LINODE", NewLinode, features)
 }
 
 func (api *LinodeApi) GetNameservers(domain string) ([]*models.Nameserver, error) {
@@ -138,7 +139,7 @@ func (api *LinodeApi) GetDomainCorrections(dc *models.DomainConfig) ([]*models.C
 	}
 
 	// Normalize
-	models.Downcase(existingRecords)
+	models.PostProcessRecords(existingRecords)
 
 	// Linode doesn't allow selecting an arbitrary TTL, only a set of predefined values
 	// We need to make sure we don't change it every time if it is as close as it's going to get

providers/namecheap/namecheapProvider.go

@@ -25,20 +25,21 @@ type Namecheap struct {
 	client  *nc.Client
 }
 
-var docNotes = providers.DocumentationNotes{
+var features = providers.DocumentationNotes{
-	providers.DocCreateDomains:       providers.Cannot("Requires domain registered through their service"),
-	providers.DocOfficiallySupported: providers.Cannot(),
-	providers.DocDualHost:            providers.Cannot("Doesn't allow control of apex NS records"),
 	providers.CanUseAlias:            providers.Cannot(),
 	providers.CanUseCAA:              providers.Cannot(),
-	providers.CanUseSRV:              providers.Cannot("The namecheap web console allows you to make SRV records, but their api does not let you read or set them"),
 	providers.CanUsePTR:              providers.Cannot(),
+	providers.CanUseSRV:              providers.Cannot("The namecheap web console allows you to make SRV records, but their api does not let you read or set them"),
 	providers.CanUseTLSA:             providers.Cannot(),
+	providers.CantUseNOPURGE:         providers.Cannot(),
+	providers.DocCreateDomains:       providers.Cannot("Requires domain registered through their service"),
+	providers.DocDualHost:            providers.Cannot("Doesn't allow control of apex NS records"),
+	providers.DocOfficiallySupported: providers.Cannot(),
 }
 
 func init() {
 	providers.RegisterRegistrarType("NAMECHEAP", newReg)
-	providers.RegisterDomainServiceProviderType("NAMECHEAP", newDsp, providers.CantUseNOPURGE, docNotes)
+	providers.RegisterDomainServiceProviderType("NAMECHEAP", newDsp, features)
 	providers.RegisterCustomRecordType("URL", "NAMECHEAP", "")
 	providers.RegisterCustomRecordType("URL301", "NAMECHEAP", "")
 	providers.RegisterCustomRecordType("FRAME", "NAMECHEAP", "")
@@ -156,7 +157,7 @@ func (n *Namecheap) GetDomainCorrections(dc *models.DomainConfig) ([]*models.Cor
 	}
 
 	// Normalize
-	models.Downcase(actual)
+	models.PostProcessRecords(actual)
 
 	differ := diff.New(dc)
 	_, create, delete, modify := differ.IncrementalDiff(actual)

providers/namedotcom/namedotcomProvider.go

@@ -19,11 +19,13 @@ type nameDotCom struct {
 	APIKey  string `json:"apikey"`
 }
 
-var docNotes = providers.DocumentationNotes{
+var features = providers.DocumentationNotes{
-	providers.DocDualHost:            providers.Cannot("Apex NS records not editable"),
+	providers.CanUseAlias:            providers.Can(),
-	providers.DocCreateDomains:       providers.Cannot("New domains require registration"),
-	providers.DocOfficiallySupported: providers.Can(),
 	providers.CanUsePTR:              providers.Cannot("PTR records are not supported (See Link)", "https://www.name.com/support/articles/205188508-Reverse-DNS-records"),
+	providers.CanUseSRV:              providers.Can(),
+	providers.DocCreateDomains:       providers.Cannot("New domains require registration"),
+	providers.DocDualHost:            providers.Cannot("Apex NS records not editable"),
+	providers.DocOfficiallySupported: providers.Can(),
 }
 
 func newReg(conf map[string]string) (providers.Registrar, error) {
@@ -48,7 +50,7 @@ func newProvider(conf map[string]string) (*nameDotCom, error) {
 
 func init() {
 	providers.RegisterRegistrarType("NAMEDOTCOM", newReg)
-	providers.RegisterDomainServiceProviderType("NAMEDOTCOM", newDsp, providers.CanUseAlias, providers.CanUseSRV, docNotes)
+	providers.RegisterDomainServiceProviderType("NAMEDOTCOM", newDsp, features)
 }
 
 ///

providers/namedotcom/records.go

@@ -38,7 +38,7 @@ func (n *nameDotCom) GetDomainCorrections(dc *models.DomainConfig) ([]*models.Co
 	checkNSModifications(dc)
 
 	// Normalize
-	models.Downcase(actual)
+	models.PostProcessRecords(actual)
 
 	differ := diff.New(dc)
 	_, create, del, mod := differ.IncrementalDiff(actual)

providers/ns1/ns1provider.go

@@ -67,7 +67,7 @@ func (n *nsone) GetDomainCorrections(dc *models.DomainConfig) ([]*models.Correct
 	desiredGrouped := dc.Records.Grouped()
 
 	//  Normalize
-	models.Downcase(found)
+	models.PostProcessRecords(found)
 
 	differ := diff.New(dc)
 	changedGroups := differ.ChangedGroups(found)

providers/ovh/ovhProvider.go

@@ -3,13 +3,14 @@ package ovh
 import (
 	"encoding/json"
 	"fmt"
+	"sort"
+	"strings"
+
 	"github.com/StackExchange/dnscontrol/models"
 	"github.com/StackExchange/dnscontrol/providers"
 	"github.com/StackExchange/dnscontrol/providers/diff"
 	"github.com/miekg/dns/dnsutil"
 	"github.com/xlucas/go-ovh/ovh"
-	"sort"
-	"strings"
 )
 
 type ovhProvider struct {
@@ -17,14 +18,15 @@ type ovhProvider struct {
 	zones  map[string]bool
 }
 
-var docNotes = providers.DocumentationNotes{
+var features = providers.DocumentationNotes{
-	providers.DocDualHost:            providers.Can(),
-	providers.DocCreateDomains:       providers.Cannot("New domains require registration"),
-	providers.DocOfficiallySupported: providers.Cannot(),
 	providers.CanUseAlias:            providers.Cannot(),
-	providers.CanUseTLSA:             providers.Can(),
 	providers.CanUseCAA:              providers.Cannot(),
 	providers.CanUsePTR:              providers.Cannot(),
+	providers.CanUseSRV:              providers.Can(),
+	providers.CanUseTLSA:             providers.Can(),
+	providers.DocCreateDomains:       providers.Cannot("New domains require registration"),
+	providers.DocDualHost:            providers.Can(),
+	providers.DocOfficiallySupported: providers.Cannot(),
 }
 
 func newOVH(m map[string]string, metadata json.RawMessage) (*ovhProvider, error) {
@@ -50,7 +52,7 @@ func newReg(conf map[string]string) (providers.Registrar, error) {
 
 func init() {
 	providers.RegisterRegistrarType("OVH", newReg)
-	providers.RegisterDomainServiceProviderType("OVH", newDsp, providers.CanUseSRV, providers.CanUseTLSA, docNotes)
+	providers.RegisterDomainServiceProviderType("OVH", newDsp, features)
 }
 
 func (c *ovhProvider) GetNameservers(domain string) ([]*models.Nameserver, error) {
@@ -124,7 +126,7 @@ func (c *ovhProvider) GetDomainCorrections(dc *models.DomainConfig) ([]*models.C
 	}
 
 	// Normalize
-	models.Downcase(actual)
+	models.PostProcessRecords(actual)
 
 	differ := diff.New(dc)
 	_, create, delete, modify := differ.IncrementalDiff(actual)

providers/route53/route53Provider.go

@@ -55,15 +55,19 @@ func newRoute53(m map[string]string, metadata json.RawMessage) (*route53Provider
 	return api, nil
 }
 
-var docNotes = providers.DocumentationNotes{
+var features = providers.DocumentationNotes{
-	providers.DocDualHost:            providers.Can(),
-	providers.DocCreateDomains:       providers.Can(),
-	providers.DocOfficiallySupported: providers.Can(),
 	providers.CanUseAlias:            providers.Cannot("R53 does not provide a generic ALIAS functionality. They do have 'ALIAS' CNAME types to point at various AWS infrastructure, but dnscontrol has not implemented those."),
+	providers.DocCreateDomains:       providers.Can(),
+	providers.DocDualHost:            providers.Can(),
+	providers.DocOfficiallySupported: providers.Can(),
+	providers.CanUsePTR:              providers.Can(),
+	providers.CanUseSRV:              providers.Can(),
+	providers.CanUseTXTMulti:         providers.Can(),
+	providers.CanUseCAA:              providers.Can(),
 }
 
 func init() {
-	providers.RegisterDomainServiceProviderType("ROUTE53", newRoute53Dsp, providers.CanUsePTR, providers.CanUseSRV, providers.CanUseCAA, docNotes)
+	providers.RegisterDomainServiceProviderType("ROUTE53", newRoute53Dsp, features)
 	providers.RegisterRegistrarType("ROUTE53", newRoute53Reg)
 }
 
@@ -170,7 +174,7 @@ func (r *route53Provider) GetDomainCorrections(dc *models.DomainConfig) ([]*mode
 	}
 
 	// Normalize
-	models.Downcase(existingRecords)
+	models.PostProcessRecords(existingRecords)
 
 	//diff
 	differ := diff.New(dc)

providers/softlayer/softlayerProvider.go

@@ -21,8 +21,12 @@ type SoftLayer struct {
 	Session *session.Session
 }
 
+var features = providers.DocumentationNotes{
+	providers.CanUseSRV: providers.Can(),
+}
+
 func init() {
-	providers.RegisterDomainServiceProviderType("SOFTLAYER", newReg, providers.CanUseSRV)
+	providers.RegisterDomainServiceProviderType("SOFTLAYER", newReg, features)
 }
 
 func newReg(conf map[string]string, _ json.RawMessage) (providers.DNSServiceProvider, error) {
@@ -164,7 +168,7 @@ func (s *SoftLayer) getExistingRecords(domain *datatypes.Dns_Domain) ([]*models.
 	}
 
 	// Normalize
-	models.Downcase(actual)
+	models.PostProcessRecords(actual)
 
 	return actual, nil
 }

providers/vultr/vultrProvider.go

@@ -24,16 +24,18 @@ Info required in `creds.json`:
 
 */
 
-var docNotes = providers.DocumentationNotes{
+var features = providers.DocumentationNotes{
+	providers.CanUseAlias:            providers.Cannot(),
+	providers.CanUseCAA:              providers.Can(),
+	providers.CanUsePTR:              providers.Cannot(),
+	providers.CanUseSRV:              providers.Can(),
+	providers.CanUseTLSA:             providers.Cannot(),
 	providers.DocCreateDomains:       providers.Can(),
 	providers.DocOfficiallySupported: providers.Cannot(),
-	providers.CanUseAlias:            providers.Cannot(),
-	providers.CanUseTLSA:             providers.Cannot(),
-	providers.CanUsePTR:              providers.Cannot(),
 }
 
 func init() {
-	providers.RegisterDomainServiceProviderType("VULTR", NewVultr, providers.CanUseSRV, providers.CanUseCAA, docNotes)
+	providers.RegisterDomainServiceProviderType("VULTR", NewVultr, features)
 }
 
 // VultrApi represents the Vultr DNSServiceProvider
@@ -98,7 +100,7 @@ func (api *VultrApi) GetDomainCorrections(dc *models.DomainConfig) ([]*models.Co
 	}
 
 	// Normalize
-	models.Downcase(curRecords)
+	models.PostProcessRecords(curRecords)
 
 	differ := diff.New(dc)
 	_, create, delete, modify := differ.IncrementalDiff(curRecords)