63 lines
1.9 KiB
JavaScript
63 lines
1.9 KiB
JavaScript
// Cached ENS reverse resolution.
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// Resolves addresses to ENS names via ethers provider.lookupAddress(),
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// caching results in localStorage with a 12-hour TTL.
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//
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// POPUP ONLY. localStorage does not exist in the Chrome MV3 service worker,
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// so this module must not be pulled into src/background/. Anything the
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// background context needs to cache goes in extension storage instead (see
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// shared/phishingDomains.js).
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const { getProvider } = require("./balances");
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const { log } = require("./log");
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const CACHE_TTL_MS = 43200000; // 12 hours
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const CACHE_PREFIX = "ens:";
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function getCached(address) {
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const key = CACHE_PREFIX + address.toLowerCase();
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try {
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const raw = localStorage.getItem(key);
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if (!raw) return undefined;
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const entry = JSON.parse(raw);
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if (Date.now() - entry.ts < CACHE_TTL_MS) {
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return entry.name;
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}
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} catch {
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// Corrupt cache entry — treat as miss.
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}
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return undefined;
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}
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function setCache(address, name) {
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const key = CACHE_PREFIX + address.toLowerCase();
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localStorage.setItem(key, JSON.stringify({ name, ts: Date.now() }));
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}
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async function resolveEnsName(address, rpcUrl) {
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const cached = getCached(address);
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if (cached !== undefined) return cached;
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const provider = getProvider(rpcUrl);
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try {
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const name = (await provider.lookupAddress(address)) || null;
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setCache(address, name);
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return name;
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} catch (e) {
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log.errorf("ENS reverse lookup failed", address, e.message);
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// Don't cache failures — let subsequent lookups retry
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return null;
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}
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}
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async function resolveEnsNames(addresses, rpcUrl) {
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const results = new Map();
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await Promise.all(
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addresses.map(async (addr) => {
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results.set(addr, await resolveEnsName(addr, rpcUrl));
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}),
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);
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return results;
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}
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module.exports = { resolveEnsName, resolveEnsNames };
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