feat(tmpl): {{domain_name}} placeholder — materialize on diff/apply, parameterize on snapshot

Adds internal/tmpl with Materialize (template placeholder -> zone name) and Parameterize (zone name -> placeholder, the inverse used by the template-from-zone snapshot). service.resolve now materializes the template against DomainRef.ZoneName before diffing, so one template can be reused across domains. LoadDomainFull (source query + hand-edited sqlc output, since sqlc is not installed) now also selects zone_name to populate it. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01BwxdSt4reTm7Dj1oxRvpP3
2026-07-05 13:41:18 +07:00
parent 135917216c
commit df895d8850
9 changed files with 158 additions and 11 deletions
@@ -0,0 +1,61 @@
+// Package tmpl renders reusable DNS templates for a concrete zone.
+//
+// A template stores records containing the {{domain_name}} placeholder; it is
+// materialised (placeholder -> zone name, without the trailing dot) just
+// before diff/apply against a specific domain, and parameterised (zone name
+// -> placeholder) when snapshotting a live zone into a reusable template.
+package tmpl
+
+import (
+	"strings"
+
+	"github.com/vasyakrg/dns-autoresolver/internal/model"
+	"github.com/vasyakrg/dns-autoresolver/internal/store/dto"
+)
+
+const Placeholder = "{{domain_name}}"
+
+func zoneName(z string) string { return strings.TrimSuffix(z, ".") }
+
+// Materialize renders a template's records for the given zone, substituting
+// {{domain_name}} with the zone name (without the trailing dot) in each
+// record's Name and every Value.
+func Materialize(doc dto.TemplateDoc, zone string) []model.Record {
+	z := zoneName(zone)
+	out := make([]model.Record, 0, len(doc.Records))
+	for _, r := range doc.Records {
+		vals := make([]string, len(r.Values))
+		for i, v := range r.Values {
+			vals[i] = strings.ReplaceAll(v, Placeholder, z)
+		}
+		out = append(out, model.Record{
+			Type:   model.RecordType(r.Type),
+			Name:   strings.ReplaceAll(r.Name, Placeholder, z),
+			TTL:    r.TTL,
+			Values: vals,
+		})
+	}
+	return out
+}
+
+// Parameterize replaces occurrences of the zone name with {{domain_name}} in
+// record names and values, so a snapshot of a live zone becomes portable.
+// Records with no zone-name occurrence (DKIM key, external CNAME target) are
+// left unchanged.
+func Parameterize(recs []model.Record, zone string) dto.TemplateDoc {
+	z := zoneName(zone)
+	out := dto.TemplateDoc{Records: make([]dto.RecordDTO, 0, len(recs))}
+	for _, r := range recs {
+		vals := make([]string, len(r.Values))
+		for i, v := range r.Values {
+			vals[i] = strings.ReplaceAll(v, z, Placeholder)
+		}
+		out.Records = append(out.Records, dto.RecordDTO{
+			Type:   string(r.Type),
+			Name:   strings.ReplaceAll(r.Name, z, Placeholder),
+			TTL:    r.TTL,
+			Values: vals,
+		})
+	}
+	return out
+}