55 lines
2.3 KiB
JavaScript
55 lines
2.3 KiB
JavaScript
// Private notes (NIP-17): a kind-14 message, sealed by the sender (NIP-59 kind 13) and gift-wrapped (kind 1059) by a
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// throwaway key for each recipient, so relays see neither the words nor who sent them.
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import { generatePrivateKey, nip44ConversationKey, nip44Encrypt, unhex } from './crypto.js';
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import { eventId, finalizeEvent, now, tagValue, verifyEvent } from './nostr.js';
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const TWO_DAYS = 2 * 24 * 60 * 60;
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const jitter = () => now() - Math.floor(Math.random() * TWO_DAYS);
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export function rumor(senderPubkey, recipients, text, extraTags = []) {
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const r = {
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kind: 14,
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pubkey: senderPubkey,
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created_at: now(),
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tags: [...recipients.map((p) => ['p', p]), ...extraTags],
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content: text,
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};
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r.id = eventId(r);
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return r;
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}
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// seal for one recipient (signed by the sender), then wrap it with a fresh key
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export async function wrapFor(signer, rumorEvent, recipient) {
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const seal = await signer.signEvent({
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kind: 13, created_at: jitter(), tags: [], content: await signer.nip44Encrypt(recipient, JSON.stringify(rumorEvent)),
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});
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const eph = generatePrivateKey();
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const content = nip44Encrypt(JSON.stringify(seal), nip44ConversationKey(eph, unhex(recipient)));
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return finalizeEvent({ kind: 1059, created_at: jitter(), tags: [['p', recipient]], content }, eph);
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}
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// One wrap for the recipient and one for the sender's own inbox, so the note shows up on their other clients too
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export async function sealNote(signer, recipient, text) {
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const me = await signer.getPublicKey();
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const r = rumor(me, [recipient], text);
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const toThem = await wrapFor(signer, r, recipient);
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const toMe = recipient === me ? null : await wrapFor(signer, r, me);
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return { rumor: r, toThem, toMe };
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}
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// Open a gift wrap addressed to us. Returns the rumor with its true sender, or null if anything doesn't check out.
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export async function openWrap(signer, wrap) {
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try {
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if (wrap.kind !== 1059 || !verifyEvent(wrap)) return null;
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const seal = JSON.parse(await signer.nip44Decrypt(wrap.pubkey, wrap.content));
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if (seal.kind !== 13 || !verifyEvent(seal)) return null;
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const r = JSON.parse(await signer.nip44Decrypt(seal.pubkey, seal.content));
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if (r.pubkey !== seal.pubkey) return null;
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if (r.kind !== 14 || typeof r.content !== 'string') return null;
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return { ...r, wrapId: wrap.id, to: tagValue(r, 'p') };
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} catch {
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return null;
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}
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}
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