feat(ui): add support for showing existing tag options

tests/unit/utils/node-info.test.ts

@@ -1,6 +1,6 @@
 import { describe, expect, test } from "vitest";
 
-import { isNoExpiry } from "~/utils/node-info";
+import { extractTagOwnerTags, isNoExpiry, sortAssignableTags } from "~/utils/node-info";
 
 describe("isNoExpiry", () => {
   test("returns true for null", () => {
@@ -27,3 +27,51 @@ describe("isNoExpiry", () => {
     expect(isNoExpiry("2020-01-01T00:00:00Z")).toBe(false);
   });
 });
+
+describe("extractTagOwnerTags", () => {
+  test("reads tags from HuJSON tagOwners", () => {
+    expect(
+      extractTagOwnerTags(`{
+        // comment
+        "tagOwners": {
+          "tag:prod": ["group:admins"],
+          "tag:server": [],
+        },
+      }`),
+    ).toEqual(["tag:prod", "tag:server"]);
+  });
+
+  test("ignores invalid policies", () => {
+    expect(extractTagOwnerTags("not-json")).toEqual([]);
+  });
+});
+
+describe("sortAssignableTags", () => {
+  test("unions assigned node tags with ACL tag owners", () => {
+    expect(
+      sortAssignableTags(
+        [
+          {
+            id: "1",
+            givenName: "node",
+            name: "node",
+            machineKey: "mkey:test",
+            nodeKey: "nodekey:test",
+            discoKey: "discokey:test",
+            ipAddresses: [],
+            tags: ["tag:used"],
+            lastSeen: "",
+            expiry: null,
+            online: true,
+            registerMethod: "REGISTER_METHOD_AUTH_KEY",
+            createdAt: "",
+            availableRoutes: [],
+            approvedRoutes: [],
+            subnetRoutes: [],
+          },
+        ],
+        '{"tagOwners":{"tag:declared":[]}}',
+      ),
+    ).toEqual(["tag:declared", "tag:used"]);
+  });
+});