Zone page: links to the same zone in the other views

The header says "also in VIEW" for every zone of the same name in
another view, linked or not, in the view's colour, keeping the open tab
where the other zone has it. The zone API gains in_views.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

CHANGELOG.md

@@ -8,6 +8,10 @@ All notable changes to Jarl are documented here. The format follows
 
 ### Added
 
+- A zone's page links to the same zone in the other views ("also in
+  external"), in each view's colour, keeping the tab you are on. It
+  works for zones that aren't linked too, and the zone API's new
+  `in_views` lists them.
 - `jarl.service` has the alias `jarld.service`, so `systemctl restart
   jarld` works too. The alias is linked when the unit is enabled; the
   package relinks a unit enabled by an older version on upgrade.

docs/api.md

@@ -363,7 +363,10 @@ In a linked zone ([views.md](views.md#linked-zones)), records carry
 (`PATCH /records/{id}`) and setting (`PUT .../rrsets/...`) take `"local":
 true` (this view only, an override) or `false` (shared; on an update or a
 set it makes this view's version every view's). Zones carry `link_group`
-and `linked_with` (the other views).
+and `linked_with` (the other views). Every zone in a view carries
+`in_views`: the zones of the same name in the other views, linked or not
+and of any type, in view order (`[{"id": 289, "view": "external", "type":
+"primary", "linked": true}]`).
 
 | Method | Path | Body |
 |--------|------|------|

docs/views.md

@@ -168,6 +168,10 @@ shows one (it needs `tsig:write` and is audited). Key names starting with
 `jarl-view-` are reserved, and the view keys can be used in your own
 options (`allow-transfer { key jarl-view-external; }`).
 
+**Moving between views.** A zone's page lists the other views that have a
+zone of the same name ("also in external", in each view's colour). Each
+one links straight to that zone, on the tab you are on.
+
 ## Linked zones
 
 Most split-horizon zones are the same in every view apart from a few

internal/api/types.go

@@ -34,6 +34,9 @@ type Zone struct {
 	LinkedWith []string `json:"linked_with,omitempty"`
 	// Links are the zones this one is linked with, with their views.
 	Links []ZoneLink `json:"links,omitempty"`
+	// InViews are the zones of this name in the other views (any type),
+	// in view order: for going straight to one.
+	InViews []ZoneLink `json:"in_views,omitempty"`
 	// OtherViews are the other views with a primary zone of this name
 	// (linked or not): what GET /zones/{zone}/compare compares.
 	OtherViews []string `json:"other_views,omitempty"`
@@ -628,6 +631,9 @@ type BlockRule struct {
 type ZoneLink struct {
 	ID   int64  `json:"id"`
 	View string `json:"view"`
+	// Type and Linked are set in Zone.InViews.
+	Type   string `json:"type,omitempty"`
+	Linked bool   `json:"linked,omitempty"`
 }
 
 // EncDNSSummary is what the dashboard says about encrypted DNS.

internal/server/dsat_test.go

@@ -35,3 +35,17 @@ func TestDNSSECWhereDSGoes(t *testing.T) {
 		}
 	}
 }
+
+// A zone lists the zones of its name in the other views.
+func TestZoneInViews(t *testing.T) {
+	e := newAPIEnv(t)
+	e.do("POST", "/views", e.token, map[string]any{"name": "internal", "match_clients": []string{"10.0.0.0/8"}}, 201)
+	e.do("POST", "/views", e.token, map[string]any{"name": "external"}, 201)
+	e.do("POST", "/zones", e.token, map[string]any{"name": "adbraun.lol", "view": "internal", "nameservers": []string{"ns1.example.net."}}, 201)
+	e.do("POST", "/zones", e.token, map[string]any{"name": "adbraun.lol", "view": "external", "nameservers": []string{"ns1.example.net."}}, 201)
+	z := e.do("GET", "/zones/adbraun.lol?view=internal", e.token, nil, 200)
+	in, _ := z["in_views"].([]any)
+	if len(in) != 1 || in[0].(map[string]any)["view"] != "external" || in[0].(map[string]any)["type"] != "primary" {
+		t.Errorf("in_views = %v", z["in_views"])
+	}
+}

internal/server/present.go

@@ -29,6 +29,15 @@ func (s *Server) presentZone(st *model.State, z *model.Zone, counts map[int64]re
 			}
 		}
 	}
+	if z.ViewID != 0 {
+		others := st.ZonesNamed(z.Name)
+		st.SortByView(others)
+		for _, o := range others {
+			if o.ID != z.ID {
+				out.InViews = append(out.InViews, api.ZoneLink{ID: o.ID, View: st.ViewName(o), Type: o.Type, Linked: z.LinkGroup != 0 && o.LinkGroup == z.LinkGroup})
+			}
+		}
+	}
 	if pf, ok := dnsname.PrefixFromReverse(z.Name); ok {
 		out.Prefix = pf.String()
 		if z.Type == model.ZonePrimary {

internal/web/static/assets/pages/zone.js

@@ -9,6 +9,15 @@ import { registrarTab } from "./registrar.js";
 
 let renderSeq = 0;
 
+// tabIn is the "/tab" part of the address of zone o (an in_views entry)
+// that keeps the tab open now, when o has that tab.
+function tabIn(o, tab) {
+  if (!tab || tab === "registrar") return "";
+  if (["records", "file", "dnssec", "compare"].includes(tab) && o.type !== "primary") return "";
+  if (tab === "servers" && !["primary", "secondary", "mirror"].includes(o.type)) return "";
+  return "/" + tab;
+}
+
 export async function render(el, params, query) {
   const id = params.id;
   const [zone, views] = await Promise.all([get("/zones/" + id, draftQuery()), get("/views")]);
@@ -33,12 +42,19 @@ export async function render(el, params, query) {
           badge(zone.type, "accent"), " ",
           zone.pending ? [pendingBadge(zone.pending), " "] : null,
           zone.view ? ["view ", viewLink(view, zone.view, "#/zones/" + id + (params.tab ? "/" + params.tab : "")), " · "] : null,
+          zone.in_views ? [h("span", { title: "The zone " + zone.display_name + " in another view" }, "also in ",
+            zone.in_views.map((o, i) => {
+              const v = views.find((x) => x.name === o.view);
+              return [i ? ", " : "", h("a", { href: "#/zones/" + o.id + tabIn(o, params.tab), class: v && v.color ? "vc-" + v.color : null,
+                title: "Go to " + zone.display_name + " in view " + o.view + (o.type !== zone.type ? " (" + o.type + ")" : "") + (o.linked ? ", linked with this one" : "") }, o.view),
+                o.type !== zone.type ? h("span", { class: "muted" }, " (" + o.type + ")") : null];
+            })), " · "] : null,
           zone.type === "primary" ? "serial " + zone.soa.serial + " · " : null,
           zone.prefix ? h("span", { class: "mono" }, zone.prefix + " · ") : null,
           zone.auto_ptr ? [h("a", { href: "#/zones/" + id + "/settings", title: "Adding, changing, disabling or deleting an A or AAAA record does the same to its PTR record" }, badge("PTRs kept in step", "ok")), " "] : null,
           zone.dnssec_policy ? [h("a", { href: "#/zones/" + id + "/dnssec" }, badge(zone.dnssec_policy === "insecure" ? "DNSSEC: turning off" : "DNSSEC", zone.dnssec_policy === "insecure" ? "warn" : "ok")), " "] : null,
           zone.links ? [h("span", { class: "badge accent" }, "linked with ",
-            zone.links.map((l, i) => [i ? ", " : "", h("a", { href: "#/zones/" + l.id + (params.tab ? "/" + params.tab : ""), title: "The zone in view " + l.view }, l.view)])), " "] : null,
+            zone.links.map((l, i) => [i ? ", " : "", h("a", { href: "#/zones/" + l.id + tabIn({ type: zone.type }, params.tab), title: "The zone in view " + l.view }, l.view)])), " "] : null,
           zone.zone_file ? h("span", { class: "mono small" }, zone.zone_file) : null)),
       h("div", { class: "actions" },
         zone.disabled