feat(dns): parse hsd record fields case-insensitively

Co-Authored-By: Virgil <virgil@lethean.io>

hsd.go

@@ -209,37 +209,49 @@ func parseHSDNameResource(raw json.RawMessage) (NameRecords, error) {
 	return NameRecords{}, errors.New("unable to parse getnameresource result")
 }
 
+func getCaseInsensitiveRecordField(fields map[string]json.RawMessage, key string) json.RawMessage {
+	if fields == nil {
+		return nil
+	}
+	for candidate, value := range fields {
+		if strings.EqualFold(candidate, key) {
+			return value
+		}
+	}
+	return nil
+}
+
 func parseHSDNameResourceRecords(raw json.RawMessage) (NameRecords, error) {
 	var fields map[string]json.RawMessage
 	if err := json.Unmarshal(raw, &fields); err != nil {
 		return NameRecords{}, err
 	}
 
-	a, err := parseHSDRecordValue(fields["a"])
+	a, err := parseHSDRecordValue(getCaseInsensitiveRecordField(fields, "a"))
 	if err != nil {
 		return NameRecords{}, err
 	}
-	aaaa, err := parseHSDRecordValue(fields["aaaa"])
+	aaaa, err := parseHSDRecordValue(getCaseInsensitiveRecordField(fields, "aaaa"))
 	if err != nil {
 		return NameRecords{}, err
 	}
-	txt, err := parseHSDRecordValue(fields["txt"])
+	txt, err := parseHSDRecordValue(getCaseInsensitiveRecordField(fields, "txt"))
 	if err != nil {
 		return NameRecords{}, err
 	}
-	ns, err := parseHSDRecordValue(fields["ns"])
+	ns, err := parseHSDRecordValue(getCaseInsensitiveRecordField(fields, "ns"))
 	if err != nil {
 		return NameRecords{}, err
 	}
-	ds, err := parseHSDRecordValue(fields["ds"])
+	ds, err := parseHSDRecordValue(getCaseInsensitiveRecordField(fields, "ds"))
 	if err != nil {
 		return NameRecords{}, err
 	}
-	dnsKey, err := parseHSDRecordValue(fields["dnskey"])
+	dnsKey, err := parseHSDRecordValue(getCaseInsensitiveRecordField(fields, "dnskey"))
 	if err != nil {
 		return NameRecords{}, err
 	}
-	rrSig, err := parseHSDRecordValue(fields["rrsig"])
+	rrSig, err := parseHSDRecordValue(getCaseInsensitiveRecordField(fields, "rrsig"))
 	if err != nil {
 		return NameRecords{}, err
 	}
@@ -260,14 +272,13 @@ func hasHSDNameResourceField(fields map[string]json.RawMessage) bool {
 		return false
 	}
 
-	_, hasA := fields["a"]
-	_, hasAAAA := fields["aaaa"]
-	_, hasTXT := fields["txt"]
-	_, hasNS := fields["ns"]
-	_, hasDS := fields["ds"]
-	_, hasDNSKEY := fields["dnskey"]
-	_, hasRRSIG := fields["rrsig"]
-	return hasA || hasAAAA || hasTXT || hasNS || hasDS || hasDNSKEY || hasRRSIG
+	return getCaseInsensitiveRecordField(fields, "a") != nil ||
+		getCaseInsensitiveRecordField(fields, "aaaa") != nil ||
+		getCaseInsensitiveRecordField(fields, "txt") != nil ||
+		getCaseInsensitiveRecordField(fields, "ns") != nil ||
+		getCaseInsensitiveRecordField(fields, "ds") != nil ||
+		getCaseInsensitiveRecordField(fields, "dnskey") != nil ||
+		getCaseInsensitiveRecordField(fields, "rrsig") != nil
 }
 
 func parseHSDRecordValue(raw json.RawMessage) ([]string, error) {

hsd_test.go

@@ -92,6 +92,50 @@ func TestHSDClientGetNameResourceParsesWrappedRecords(t *testing.T) {
 	}
 }
 
+func TestHSDClientGetNameResourceParsesCaseInsensitiveFields(t *testing.T) {
+	server := httptest.NewServer(http.HandlerFunc(func(responseWriter http.ResponseWriter, request *http.Request) {
+		var payload struct {
+			Method string `json:"method"`
+		}
+		if err := json.NewDecoder(request.Body).Decode(&payload); err != nil {
+			t.Fatalf("unexpected request payload: %v", err)
+		}
+		if payload.Method != "getnameresource" {
+			t.Fatalf("expected method getnameresource, got %s", payload.Method)
+		}
+
+		responseWriter.Header().Set("Content-Type", "application/json")
+		_ = json.NewEncoder(responseWriter).Encode(map[string]any{
+			"result": map[string]any{
+				"records": map[string]any{
+					"A":   []string{"10.10.10.10"},
+					"Txt": []string{"v=lthn1 type=case"},
+					"NS":  []string{"ns.example.lthn"},
+				},
+			},
+		})
+	}))
+	defer server.Close()
+
+	client := NewHSDClient(HSDClientOptions{
+		URL: server.URL,
+	})
+
+	record, err := client.GetNameResource(context.Background(), "case.lthn")
+	if err != nil {
+		t.Fatalf("unexpected getnameresource error: %v", err)
+	}
+	if len(record.A) != 1 || record.A[0] != "10.10.10.10" {
+		t.Fatalf("unexpected wrapped A result with mixed-case key: %#v", record.A)
+	}
+	if len(record.TXT) != 1 || record.TXT[0] != "v=lthn1 type=case" {
+		t.Fatalf("unexpected wrapped TXT result with mixed-case key: %#v", record.TXT)
+	}
+	if len(record.NS) != 1 || record.NS[0] != "ns.example.lthn" {
+		t.Fatalf("unexpected wrapped NS result with mixed-case key: %#v", record.NS)
+	}
+}
+
 func TestHSDClientGetNameResourceParsesDSRecords(t *testing.T) {
 	server := httptest.NewServer(http.HandlerFunc(func(responseWriter http.ResponseWriter, request *http.Request) {
 		var payload struct {