feat(api): endpoints to mark and unmark custom records

internal/api/dto.go

@@ -44,6 +44,13 @@ type applyRequest struct {
 	Prunes  []string `json:"prunes"`
 }
 
+// customRequest is the body of POST .../customs — the key travels here
+// (never as a path segment) because it contains a space and dots, e.g.
+// "CNAME admin.example.com.".
+type customRequest struct {
+	Key string `json:"key"`
+}
+
 type recordView struct {
 	Key      string   `json:"key"`
 	Kind     string   `json:"kind"`
@@ -52,17 +59,19 @@ type recordView struct {
 	Desired  []string `json:"desired,omitempty"`
 	Actual   []string `json:"actual,omitempty"`
 	ReadOnly bool     `json:"readOnly"`
+	Custom   bool     `json:"custom"`
 }
 
 type changesetResponse struct {
 	Updates  []recordView `json:"updates"`
 	Prunes   []recordView `json:"prunes"`
+	Customs  []recordView `json:"customs"`
 	ReadOnly []recordView `json:"readOnly"`
 	InSync   int          `json:"inSyncCount"`
 }
 
 func toRecordView(d diff.RecordDiff) recordView {
-	rv := recordView{Key: d.Key(), Kind: string(d.Kind), Type: string(d.Type), Name: d.Name, ReadOnly: d.ReadOnly}
+	rv := recordView{Key: d.Key(), Kind: string(d.Kind), Type: string(d.Type), Name: d.Name, ReadOnly: d.ReadOnly, Custom: d.Custom}
 	if d.Desired != nil {
 		rv.Desired = d.Desired.Values
 	}
@@ -80,6 +89,7 @@ func toChangesetResponse(cs diff.Changeset) changesetResponse {
 	resp := changesetResponse{
 		Updates:  []recordView{},
 		Prunes:   []recordView{},
+		Customs:  []recordView{},
 		ReadOnly: []recordView{},
 	}
 	for _, d := range cs.Updates() {
@@ -88,6 +98,9 @@ func toChangesetResponse(cs diff.Changeset) changesetResponse {
 	for _, d := range cs.Prunes() {
 		resp.Prunes = append(resp.Prunes, toRecordView(d))
 	}
+	for _, d := range cs.Customs() {
+		resp.Customs = append(resp.Customs, toRecordView(d))
+	}
 	for _, d := range cs.Diffs {
 		if d.ReadOnly {
 			resp.ReadOnly = append(resp.ReadOnly, toRecordView(d))