messages.ts

1/**2 * messages.ts — the only background message handler.3 *4 * All `chrome.runtime.onMessage` handling for the service worker lives here.5 * Do not handle messages inline in entry.ts, alarms.ts, or any other6 * background file. Every background-bound MessageType in shared/types.ts7 * must have a case below. Content-script-bound message types (PING,8 * SUMMON_AUTOFILL, VAULT_LOCKED) are documented in shared/types.ts and9 * intentionally have no case here — they are sent *to* content scripts.10 */1112import { copyToClipboard } from "./clipboard";13import { setupAutoLock, touchAutoLock } from "./alarms";14import * as vault from "./vault";15import {16  activateLicense,17  deactivateLicense,18  getLicenseInfo,19  getLicenseKey,20  isProUser,21  markCelebrationPlayed,22  shouldPlayCelebration,23} from "./license";24import {25  getPasskeyProviderState,26  getPendingPasskeyRequest,27  resolvePendingPasskeyRequest,28  setPasskeyProviderEnabled,29} from "./passkey";30import { buildAdvancedHealthReport, resolveResetUrl } from "./health";31import type {32  Message,33  MessageResponse,34  MessageType,35  ProFeature,36} from "../shared/types";37import type { SyncStatus } from "../shared/sync-types";3839/**40 * The single Pro gate. Every gated handler calls this first; the broadcast41 * lets the popup react (navigate to the License section, highlight the42 * relevant feature). Background never touches the popup view directly —43 * the popup owns navigation. See Projects.md "Pro gate rule".44 */45async function requirePro(46  feature: ProFeature,47  trigger: "user" | "background" = "user"48): Promise<{ allowed: boolean }> {49  if (await isProUser()) return { allowed: true };5051  if (trigger === "user") {52    // User deliberately triggered this feature — redirect the popup immediately.53    chrome.runtime54      .sendMessage({ type: "PRO_GATE_TRIGGERED", payload: { feature } })55      .catch(() => {56        // Popup may be closed — the gate signal is best-effort.57      });58  } else {59    // Background trigger (e.g. passive sync initiation) — no popup is open.60    // Queue a notice so the next popup open shows a soft banner instead of61    // silently failing.62    if (chrome.storage.session) {63      chrome.storage.session64        .set({ pendingProNotice: { feature, triggeredAt: Date.now() } })65        .catch(() => {});66    }67  }6869  return { allowed: false };70}7172const PRIVATE_IPV4_RANGES = [73  { prefix: "10." },74  { prefix: "127." },75  { prefix: "169.254." },76  { prefix: "192.168." },77];7879// Empty disables network submission while the UI continues to function as a80// no-op (the handler returns ok:true without calling fetch). When set, the81// URL is validated by `isAllowedCanaryWebhookUrl` before any request, so the82// same private-IP/HTTPS rules that gate canary webhooks apply here.83const FEEDBACK_ENDPOINT = "";8485export function setupMessageHandler(): void {86  chrome.runtime.onMessage.addListener(87    (msg: unknown, sender, sendResponse) => {88      if (!isMessage(msg)) {89        sendResponse({ ok: false, error: "invalid message" });90        return true;91      }92      handleMessage(msg, sender)93        .then(sendResponse)94        .catch((err) =>95          sendResponse({96            ok: false,97            error: err instanceof Error ? err.message : String(err),98          })99        );100      return true;101    }102  );103}104105function isMessage(m: unknown): m is Message {106  return typeof m === "object" && m !== null && "type" in m;107}108109async function handleMessage(110  msg: Message,111  sender: chrome.runtime.MessageSender112): Promise<MessageResponse> {113  try {114    // Validate sender — only allow messages from our extension pages/scripts.115    // `sender.id` is undefined for messages originating from extension UI116    // (popup/options), which is legitimate; reject only when it is defined117    // and does not match our extension id.118    if (sender.id !== undefined && sender.id !== chrome.runtime.id) {119      return { ok: false, error: "invalid sender" };120    }121122    if (shouldRefreshAutoLock(msg.type) && vault.isUnlocked()) {123      touchAutoLock();124    }125126    switch (msg.type) {127      case "CREATE_VAULT": {128        const { password } = msg.payload as { password: string };129        await vault.createVault(password);130        await setupAutoLock();131        broadcastToContentScripts({ type: "VAULT_UNLOCKED" });132        return { ok: true };133      }134      case "UNLOCK": {135        const { password } = msg.payload as { password: string };136        const ok = await vault.unlock(password);137        if (ok) {138          await setupAutoLock();139          broadcastToContentScripts({ type: "VAULT_UNLOCKED" });140        }141        return { ok };142      }143      case "LOCK":144        vault.lock();145        return { ok: true };146      case "IS_UNLOCKED":147        return { ok: true, data: vault.isUnlocked() };148      case "GET_VAULT_STATUS":149        return { ok: true, unlocked: vault.isUnlocked() };150      case "HAS_VAULT":151        return { ok: true, data: await vault.hasVault() };152      case "GET_ENTRIES":153        return { ok: true, data: vault.getEntries() };154      case "ADD_ENTRY": {155        const entry = await vault.addEntry(msg.payload as any);156        return { ok: true, data: entry };157      }158      case "BATCH_ADD_ENTRIES": {159        const { entries } = msg.payload as { entries: any[] };160        const added = await vault.batchAddEntries(entries);161        return { ok: true, data: added };162      }163      case "RESTORE_ENTRIES": {164        const { entries, mode, settings } = msg.payload as {165          entries: any[];166          mode: "replace" | "merge";167          settings?: vault.VaultSettings;168        };169        const summary = await vault.restoreEntries(entries, mode);170        if (settings && typeof settings === "object") {171          await vault.updateSettings(settings);172        }173        return { ok: true, data: summary };174      }175      case "CLEAR_VAULT_ENTRIES": {176        await vault.clearVaultEntries("REPLACE_ALL");177        return { ok: true };178      }179      case "LIST_VAULT_SNAPSHOTS": {180        const snapshots = await vault.listSnapshots();181        return { ok: true, data: snapshots };182      }183      case "RESTORE_VAULT_SNAPSHOT": {184        const { index, password } = msg.payload as { index: number; password: string };185        const ok = await vault.restoreFromSnapshot(index, password);186        if (ok) broadcastToContentScripts({ type: "VAULT_UNLOCKED" });187        return { ok };188      }189      case "COUNT_DUPLICATES": {190        return { ok: true, data: vault.countDuplicates() };191      }192      case "DEDUPLICATE_ENTRIES": {193        const removed = await vault.deduplicateEntries();194        return { ok: true, data: removed };195      }196      case "UPDATE_ENTRY": {197        const { id, patch } = msg.payload as any;198        await vault.updateEntry(id, patch);199        return { ok: true };200      }201      case "ADD_ADDITIONAL_URL": {202        const { id, url } = msg.payload as { id: string; url: string };203        const trimmed = typeof url === "string" ? url.trim() : "";204        if (!trimmed) return { ok: false, error: "url required" };205        const existing = vault.getEntryById(id);206        if (!existing) return { ok: false, error: "entry not found" };207        if (existing.type !== "login") return { ok: false, error: "login entries only" };208        const merged = [...(existing.additionalUrls ?? []), trimmed];209        await vault.updateEntry(id, { additionalUrls: merged });210        return { ok: true };211      }212      case "DELETE_ENTRY": {213        const { id } = msg.payload as { id: string };214        await vault.deleteEntry(id);215        return { ok: true };216      }217      case "GET_DELETED_ENTRIES":218        return { ok: true, data: vault.getDeletedEntries() };219      case "RESTORE_ENTRY": {220        const { id } = msg.payload as { id: string };221        await vault.restoreEntry(id);222        return { ok: true };223      }224      case "PURGE_ENTRY": {225        const { id } = msg.payload as { id: string };226        await vault.purgeEntry(id);227        return { ok: true };228      }229      case "PURGE_EXPIRED_TRASH": {230        const { retentionMs } = msg.payload as { retentionMs: number };231        const purged = await vault.purgeExpiredTrash(retentionMs);232        return { ok: true, data: purged };233      }234      case "AUTOFILL_QUERY": {235        if (!vault.isUnlocked()) {236          return { ok: false, error: "VAULT_LOCKED" };237        }238        const { domain, includeAll, kind } = msg.payload as {239          domain: string;240          includeAll?: boolean;241          kind?: "login" | "card";242        };243        // kind="card": return saved cards as compact summaries for the244        // inline card silver platter. Cards are not domain-scoped — every245        // saved card is a candidate on every checkout page — so domain is246        // ignored when kind === "card".247        if (kind === "card") {248          const cards = vault.getEntries().filter((e) => e.type === "card");249          return {250            ok: true,251            data: cards.map((e) => ({252              id: e.id,253              title: e.cardNickname || e.title,254              cardholderName: e.cardholderName,255              last4: e.last4,256              expMonth: e.expMonth,257              expYear: e.expYear,258              network: e.network,259            })),260          };261        }262        const matches = includeAll263          ? vault264              .getEntries()265              .filter((entry) => entry.type !== "note" && entry.type !== "passkey" && entry.type !== "card")266          : vault.queryDomain(domain);267        return {268          ok: true,269          data: matches.map((e) =>270            includeAll271              ? {272                  id: e.id,273                  title: e.title,274                }275              : {276                  id: e.id,277                  title: e.title,278                  username: e.username,279                  url: e.url,280                  hasTotp: Boolean(e.totp),281                }282          ),283        };284      }285      case "GET_ENTRY_FOR_FILL": {286        if (!vault.isUnlocked()) return { ok: false, error: "vault locked" };287        const { id } = msg.payload as { id: string };288        const entry = vault.getEntryById(id);289        if (!entry) return { ok: false, error: "entry not found" };290        if (entry.type === "passkey") return { ok: false, error: "passkey not fillable" };291        // Content scripts never need the passkey private key; strip it292        // defensively even though login entries do not carry one.293        const { privateKeyJwk: _stripped, ...safeEntry } = entry;294        return { ok: true, data: safeEntry };295      }296      case "COPY": {297        const { text, label, alreadyWritten } = msg.payload as {298          text: string;299          label: string;300          alreadyWritten?: boolean;301        };302        await copyToClipboard(text, label, Boolean(alreadyWritten));303        return { ok: true };304      }305      case "CHECK_BREACH": {306        const { password } = msg.payload as { password: string };307        const count = await vault.checkBreach(password);308        return { ok: true, data: count };309      }310      case "CHECK_ALL_BREACHES": {311        const allEntries = vault.getEntries();312        const results: Record<string, number> = {};313        for (const entry of allEntries) {314          if (entry.type === "note") continue;315          if (!entry.password) continue;316          results[entry.id] = await vault.checkBreach(entry.password);317          // Small delay — be a good citizen to the HIBP API318          await new Promise((r) => setTimeout(r, 200));319        }320        // Persist any non-zero counts back to entries321        for (const [id, count] of Object.entries(results)) {322          const entry = vault.getEntryById(id);323          if (entry && (entry.breach ?? 0) !== count) {324            await vault.updateEntry(id, { breach: count > 0 ? count : undefined });325          }326        }327        return { ok: true, data: results };328      }329      case "GET_SETTINGS":330        return { ok: true, data: await vault.ensureSettingsLoaded() };331      case "UPDATE_SETTINGS": {332        const patch = msg.payload as Record<string, unknown>;333        await vault.updateSettings(patch as any);334        if (typeof patch.autoLockMinutes === "number") {335          await setupAutoLock();336          if (vault.isUnlocked()) touchAutoLock();337        }338        return { ok: true };339      }340      case "GET_PENDING_PASSKEY":341        return { ok: true, data: await getPendingPasskeyRequest() };342      case "APPROVE_PASSKEY": {343        const { requestId } = msg.payload as { requestId: number };344        await resolvePendingPasskeyRequest(requestId, true);345        return { ok: true };346      }347      case "DENY_PASSKEY": {348        const { requestId } = msg.payload as { requestId: number };349        await resolvePendingPasskeyRequest(requestId, false);350        return { ok: true };351      }352      case "GET_PASSKEYS":353        return {354          ok: true,355          data: vault.getEntries().filter((entry) => entry.type === "passkey"),356        };357      case "DELETE_PASSKEY": {358        const { id } = msg.payload as { id: string };359        await vault.deleteEntry(id);360        return { ok: true };361      }362      case "GET_PASSKEY_PROVIDER_STATE":363        return { ok: true, data: await getPasskeyProviderState() };364      case "SET_PASSKEY_PROVIDER_ENABLED": {365        const { enabled } = msg.payload as { enabled: boolean };366        // Disabling is always free; gating fires only when a free user is367        // trying to turn passkey interception on.368        if (enabled) {369          const gate = await requirePro("passkeys");370          if (!gate.allowed) return { ok: false, error: "pro_required" };371        }372        return { ok: true, data: await setPasskeyProviderEnabled(enabled) };373      }374      case "FIRE_CANARY_PING": {375        const { webhookUrl, entryTitle, trigger } = msg.payload as {376          webhookUrl: string;377          entryTitle: string;378          trigger: "password_copied" | "username_copied" | "autofilled" | "submitted" | "test";379        };380        if (!isAllowedCanaryWebhookUrl(webhookUrl)) {381          return { ok: false, error: "invalid webhook url" };382        }383        const body = JSON.stringify({384          event: trigger === "test" ? "peach_canary_test" : "peach_canary_accessed",385          entry: entryTitle,386          trigger,387          timestamp: new Date().toISOString(),388          source: "peach-extension",389        });390        if (trigger === "test") {391          // Permitted outbound fetch: user-configured canary alert endpoint392          // (validated by isAllowedCanaryWebhookUrl above). This is the393          // only non-HIBP outbound call in the extension — see394          // Projects.md §3.7. Test pings are awaited so the UI can show395          // success/failure.396          try {397            const res = await fetch(webhookUrl, {398              method: "POST",399              headers: { "Content-Type": "application/json" },400              body,401            });402            return { ok: res.ok, error: res.ok ? undefined : `HTTP ${res.status}` };403          } catch (err) {404            return { ok: false, error: err instanceof Error ? err.message : "network error" };405          }406        }407        // Non-test triggers are fire-and-forget408        fetch(webhookUrl, {409          method: "POST",410          headers: { "Content-Type": "application/json" },411          body,412        }).catch(() => {});413        return { ok: true };414      }415      case "ACTIVATE_LICENSE": {416        const { key } = msg.payload as { key: string };417        const licenseInfo = await activateLicense(key);418        return { ok: true, data: licenseInfo };419      }420      case "GET_LICENSE": {421        const licenseInfo = await getLicenseInfo();422        return { ok: true, data: licenseInfo };423      }424      case "GET_LICENSE_KEY": {425        const key = await getLicenseKey();426        return { ok: true, data: key };427      }428      case "DEACTIVATE_LICENSE": {429        await deactivateLicense();430        return { ok: true };431      }432      case "SHOULD_PLAY_CELEBRATION": {433        const should = await shouldPlayCelebration();434        return { ok: true, data: should };435      }436      case "MARK_CELEBRATION_PLAYED": {437        await markCelebrationPlayed();438        return { ok: true };439      }440      case "OPEN_PRO_GATE": {441        // Content script requests: open popup and navigate to License section.442        const { feature } = (msg.payload ?? {}) as { feature?: string };443        if (chrome.storage.session) {444          await chrome.storage.session.set({ pendingProGate: { feature: feature ?? "passkeys" } });445        }446        try { await chrome.action.openPopup(); } catch { /* badge fallback */ }447        return { ok: true };448      }449      case "GET_IDENTITIES": {450        if (!vault.isUnlocked()) return { ok: false, error: "vault locked" };451        return { ok: true, data: vault.getIdentities() };452      }453      case "GET_ADVANCED_HEALTH_REPORT": {454        const gate = await requirePro("advanced_health");455        if (!gate.allowed) return { ok: false, error: "pro_required" };456        if (!vault.isUnlocked()) return { ok: false, error: "vault locked" };457        const report = await buildAdvancedHealthReport(vault.getEntries());458        return { ok: true, data: report };459      }460      case "INITIATE_PASSWORD_CHANGE": {461        const gate = await requirePro("smart_password_change");462        if (!gate.allowed) return { ok: false, error: "pro_required" };463        if (!vault.isUnlocked()) return { ok: false, error: "vault locked" };464        const { id } = msg.payload as { id: string };465        const entry = vault.getEntryById(id);466        if (!entry) return { ok: false, error: "entry not found" };467        const url = resolveResetUrl(entry);468        if (!url) return { ok: false, error: "no reset url" };469        try {470          await chrome.tabs.create({ url });471          return { ok: true, data: { url } };472        } catch (err) {473          return {474            ok: false,475            error: err instanceof Error ? err.message : "failed to open tab",476          };477        }478      }479      case "IS_DURESS_ENABLED": {480        const enabled = await vault.isDuressEnabled();481        return { ok: true, data: enabled };482      }483      case "SETUP_DURESS": {484        const { duressPassword } = msg.payload as { duressPassword: string };485        await vault.setupDuress(duressPassword);486        return { ok: true };487      }488      case "DISABLE_DURESS": {489        await vault.disableDuress();490        return { ok: true };491      }492      case "VERIFY_MAIN_PASSWORD": {493        const { password } = msg.payload as { password: string };494        const ok = await vault.verifyMainPassword(password);495        return { ok: true, data: ok };496      }497      case "CHANGE_PASSWORD": {498        const { currentPassword, newPassword } = msg.payload as {499          currentPassword: string;500          newPassword: string;501        };502        const changed = await vault.changePassword(currentPassword, newPassword);503        return changed504          ? { ok: true }505          : { ok: false, error: "incorrect current password" };506      }507      case "GET_SITE_PASSWORD_POLICY": {508        const [tab] = await chrome.tabs.query({ active: true, currentWindow: true });509        if (!tab?.id) return { ok: true, data: null };510        try {511          const response = await chrome.tabs.sendMessage(tab.id, {512            type: "GET_SITE_PASSWORD_POLICY",513          });514          return (response as MessageResponse) ?? { ok: true, data: null };515        } catch {516          return { ok: true, data: null };517        }518      }519      case "GET_SYNC_STATE": {520        const { getPairedDevices, getTrustedNetworks } = await import('./sync-storage');521        const { isOnTailscale } = await import('./sync-network');522        const { isProUser } = await import('./license');523        const pairedDevices = await getPairedDevices();524        const trustedNetworks = await getTrustedNetworks();525        const tailscale = await isOnTailscale();526        const pro = await isProUser();527        528        let status: SyncStatus = "offline";529        if (tailscale || trustedNetworks.some((n: { isTailscale?: boolean }) => !n.isTailscale)) {530          if (pairedDevices.length === 0) {531            status = "no_peers";532          } else {533            status = "synced";534          }535        } else {536          status = "not_trusted";537        }538        539        return { ok: true, data: { pairedDevices, trustedNetworks, status, isPro: pro } };540      }541      case "TRIGGER_SYNC": {542        const gate = await requirePro("sync");543        if (!gate.allowed) return { ok: false, error: "pro_required" };544        return { ok: true };545      }546      case "START_PAIRING": {547        const gate = await requirePro("sync");548        if (!gate.allowed) return { ok: false, error: "pro_required" };549        return { ok: true };550      }551      case "CANCEL_PAIRING": {552        return { ok: true };553      }554      case "ACCEPT_PAIRING": {555        const gate = await requirePro("sync");556        if (!gate.allowed) return { ok: false, error: "pro_required" };557        return { ok: true };558      }559      case "REMOVE_PAIRED_DEVICE": {560        const { deviceId } = msg.payload as { deviceId: string };561        const { removePairedDevice } = await import('./sync-storage');562        await removePairedDevice(deviceId);563        return { ok: true };564      }565      case "REMOVE_TRUSTED_NETWORK": {566        const { ssid, bssid, isTailscale } = msg.payload as any;567        const { removeTrustedNetwork, getTrustedNetworks } = await import('./sync-storage');568        const networks = await getTrustedNetworks();569        const network = networks.find((n: { ssid?: string; bssid?: string; isTailscale?: boolean }) => 570          (isTailscale ? n.isTailscale : n.ssid === ssid) && 571          (!bssid || n.bssid === bssid)572        );573        if (network) {574          await removeTrustedNetwork(network.addedAt);575        }576        return { ok: true };577      }578      case "MARK_NETWORK_TRUSTED": {579        const { addTrustedNetwork } = await import('./sync-storage');580        const { getCurrentNetwork } = await import('./sync-network');581        const network = await getCurrentNetwork();582        await addTrustedNetwork({583          ssid: network.ssid,584          bssid: network.bssid,585          isTailscale: network.isTailscale,586          addedAt: Date.now(),587        });588        return { ok: true };589      }590      case "RECORD_MANUAL_SUMMON": {591        const { domain } = msg.payload as { domain: string };592        const settings = vault.getSettings();593        const existing = settings.manualSummonDomains?.[domain];594        const now = Date.now();595        await vault.updateSettings({596          manualSummonDomains: {597            ...settings.manualSummonDomains,598            [domain]: {599              firstSummonedAt: existing?.firstSummonedAt ?? now,600              summonCount: (existing?.summonCount ?? 0) + 1,601              lastSummonedAt: now,602            },603          },604        });605        return { ok: true };606      }607      case "DECLINE_CARD_SAVE": {608        const { last4, expMonth, expYear } = msg.payload as { last4: string; expMonth: string; expYear: string };609        await vault.declineCardSaveOffer(last4, expMonth, expYear);610        return { ok: true };611      }612      case "IS_CARD_DECLINED": {613        const { last4, expMonth, expYear } = msg.payload as { last4: string; expMonth: string; expYear: string };614        const declined = await vault.isCardDeclined(last4, expMonth, expYear);615        return { ok: true, data: declined };616      }617      case "DESTROY_VAULT": {618        // Irreversible by design. Lock zeroes the derived key + in-memory entries;619        // storage.local.clear() wipes every Peach key (slots, settings, license,620        // onboarded flag, snapshots, sync state, declined cards, recall, etc.);621        // session.clear() wipes pending passkey requests + pro-notice queues.622        // Caller (Panic.tsx) handles UI navigation back to onboarding.623        vault.lock();624        await chrome.storage.local.clear();625        if (chrome.storage.session) {626          await chrome.storage.session.clear();627        }628        return { ok: true };629      }630631      case "SUBMIT_FEEDBACK": {632        const { category, message, version, browser } = msg.payload as {633          category: string;634          message: string;635          version: string;636          browser: string;637        };638        if (!message.trim()) return { ok: false, error: "message is empty" };639        if (!FEEDBACK_ENDPOINT) return { ok: true };640        if (!isAllowedCanaryWebhookUrl(FEEDBACK_ENDPOINT)) {641          return { ok: false, error: "invalid feedback endpoint" };642        }643        try {644          const res = await fetch(FEEDBACK_ENDPOINT, {645            method: "POST",646            headers: { "Content-Type": "application/json" },647            body: JSON.stringify({ category, message, version, browser, source: "peach-extension" }),648          });649          return { ok: res.ok, error: res.ok ? undefined : `HTTP ${res.status}` };650        } catch (err) {651          return { ok: false, error: err instanceof Error ? err.message : "network error" };652        }653      }654      default:655        return { ok: false, error: "unknown message type" };656    }657  } catch (err) {658    return {659      ok: false,660      error: err instanceof Error ? err.message : "operation failed",661    };662  }663}664665/** Notify all content scripts that the vault just became available. */666function broadcastToContentScripts(message: { type: string }): void {667  chrome.tabs.query({}, (tabs) => {668    for (const tab of tabs) {669      if (tab.id !== undefined) {670        chrome.tabs.sendMessage(tab.id, message).catch(() => {671          // Tab may not have a content script — silently ignore672        });673      }674    }675  });676}677678function shouldRefreshAutoLock(type: MessageType): boolean {679  return (680    type !== "HAS_VAULT" &&681    type !== "IS_UNLOCKED" &&682    type !== "GET_VAULT_STATUS" &&683    type !== "LOCK" &&684    type !== "UPDATE_SETTINGS" &&685    type !== "GET_PENDING_PASSKEY" &&686    type !== "GET_PASSKEY_PROVIDER_STATE" &&687    type !== "DECLINE_CARD_SAVE" &&688    type !== "IS_CARD_DECLINED" &&689    type !== "SUBMIT_FEEDBACK"690  );691}692693function isAllowedCanaryWebhookUrl(value: string): boolean {694  try {695    const url = new URL(value);696    if (url.protocol !== "https:") return false;697698    const hostname = url.hostname.toLowerCase();699    if (700      hostname === "localhost" ||701      hostname.endsWith(".localhost") ||702      isPrivateIpv4(hostname) ||703      isPrivateIpv6(hostname)704    ) {705      return false;706    }707708    return true;709  } catch {710    return false;711  }712}713714function isPrivateIpv4(hostname: string): boolean {715  if (PRIVATE_IPV4_RANGES.some((range) => hostname.startsWith(range.prefix))) {716    return true;717  }718719  const octets = hostname.split(".").map((part) => Number(part));720  if (octets.length !== 4 || octets.some((octet) => !Number.isInteger(octet) || octet < 0 || octet > 255)) {721    return false;722  }723724  return octets[0] === 172 && octets[1] >= 16 && octets[1] <= 31;725}726727function isPrivateIpv6(hostname: string): boolean {728  const normalized = hostname.replace(/^\[|\]$/g, "").toLowerCase();729  return (730    normalized === "::1" ||731    normalized.startsWith("fc") ||732    normalized.startsWith("fd") ||733    normalized.startsWith("fe80:")734  );735}