fix(ui): восстанавливать контекст OSPF из URL

lib/ospf-url-state.test.ts

@@ -0,0 +1,12 @@
+import assert from "node:assert/strict"
+import { test } from "node:test"
+import { readOspfUrl, patchOspfUrl } from "./ospf-url-state"
+test("OSPF device/tab URL preserves unrelated context", () => {
+ const url=patchOspfUrl(new URLSearchParams("keep=x"),{server:"2",tab:"bfd"})
+ assert.deepEqual(readOspfUrl(new URL(url,"http://test").searchParams),{server:"2",tab:"bfd",error:null})
+ assert.equal(patchOspfUrl(new URL(url,"http://test").searchParams,{server:null,tab:null}),"/ospf?keep=x")
+})
+test("invalid or repeated context is explicit instead of widening to all",()=>{
+ for(const raw of ["server=a&server=b","tab=bfd&tab=neighbors","tab=broken","server=", "server="+"x".repeat(65),"server=%2F"]) assert.ok(readOspfUrl(new URLSearchParams(raw)).error)
+ assert.equal(readOspfUrl(new URLSearchParams("server=srv1&tab=neighbors")).error,null)
+})

lib/ospf-url-state.ts

@@ -0,0 +1,16 @@
+export const ospfTabs = ["interfaces", "neighbors", "routes", "bfd"] as const
+export type OspfTab = typeof ospfTabs[number]
+export function readOspfUrl(params: URLSearchParams) {
+ const server = params.get("server") ?? "all"
+ const rawTab = params.get("tab") ?? "interfaces"
+ let error: string | null = null
+ if (["server", "tab"].some(key => params.getAll(key).length > 1)) error = "В ссылке повторяется контекст OSPF."
+ else if (!/^[a-zA-Z0-9_.:-]{1,64}$/.test(server)) error = "В ссылке указан некорректный сервер OSPF."
+ else if (!(ospfTabs as readonly string[]).includes(rawTab)) error = "В ссылке указана неизвестная вкладка OSPF."
+ return { server, tab: (ospfTabs as readonly string[]).includes(rawTab) ? rawTab as OspfTab : "interfaces" as OspfTab, error }
+}
+export function patchOspfUrl(params: URLSearchParams, changes: Record<string, string | null>) {
+ const next = new URLSearchParams(params)
+ for (const [key,value] of Object.entries(changes)) { if (value === null || value === "") next.delete(key); else next.set(key,value) }
+ return "/ospf" + (next.size ? "?" + next.toString() : "")
+}