86 lines
2.5 KiB
JavaScript
86 lines
2.5 KiB
JavaScript
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/**
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* Looking up a BNS name's current on-chain owner via the Silent Mode gateway.
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*
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* The listing endpoint uses this to answer "did this publisher really sign
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* this?" — recover the signer address from the BIP-137 signature (that's just
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* cryptography) and compare it against what the chain says owns the name
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* (that's the trust claim).
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*
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* Memory [[recovery-is-not-verification]] is what makes this a two-step check
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* rather than one — recovery always succeeds against *some* key, so we must
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* compare the result against a claimed destination.
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*
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* MOCK_BNS_OWNER=<cashaddr> short-circuits the network call for local tests
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* where we don't have a chipnet gateway reachable or don't want to depend on
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* one for a unit test.
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*/
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const DEFAULT_GATEWAY =
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(process.env.BNS_NETWORK || 'chipnet').toLowerCase() === 'mainnet'
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? 'https://silentmode.st'
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: 'https://navigate.st';
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const BNS_GATEWAY = process.env.BNS_GATEWAY || DEFAULT_GATEWAY;
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/**
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* Fetch a name's record from the gateway. Returns:
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* {ok: true, owner, records, registered: true}
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* {ok: false, reason}
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*
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* Caches successful lookups for 60 seconds — ownership rarely changes faster
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* than that, and a listing POST should not thrash the gateway on retries.
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*/
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const cache = new Map(); // name -> {at, result}
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const CACHE_TTL_MS = 60_000;
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export async function lookupName(name) {
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const mock = process.env.MOCK_BNS_OWNER;
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if (mock) {
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return { ok: true, owner: mock, records: {}, registered: true, source: 'mock' };
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}
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const key = String(name).toLowerCase();
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const now = Date.now();
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const cached = cache.get(key);
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if (cached && now - cached.at < CACHE_TTL_MS) {
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return cached.result;
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}
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let resp;
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try {
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resp = await fetch(`${BNS_GATEWAY}/api/name/${encodeURIComponent(key)}`, {
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headers: { accept: 'application/json' },
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signal: AbortSignal.timeout(5000),
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});
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} catch (err) {
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return { ok: false, reason: `gateway unreachable: ${err?.message || err}` };
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}
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if (!resp.ok) {
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return { ok: false, reason: `gateway returned HTTP ${resp.status}` };
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}
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let body;
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try {
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body = await resp.json();
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} catch (err) {
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return { ok: false, reason: 'gateway returned non-JSON' };
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}
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if (!body.registered) {
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const result = { ok: false, reason: 'name is not registered', body };
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cache.set(key, { at: now, result });
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return result;
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}
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const result = {
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ok: true,
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owner: body.owner,
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records: body.records || {},
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registered: true,
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source: 'gateway',
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};
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cache.set(key, { at: now, result });
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return result;
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}
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