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// What the service worker needs to tell a friend's DM from a stranger's.
//
// A NIP-17 wrap is signed by a throwaway key and the sender's identity sits
// under two layers of nip44, so no server can filter DMs by who sent them —
// only the recipient's own key can open one. The notifier therefore ships the
// wrap inside the push payload and the decision happens here, on the device.
//
// THREAT MODEL, stated plainly. This record holds the nostr identity secret,
// so anything with same-origin script access or a stolen unlocked device can
// read every DM this account can read. That is not a new exposure for a
// seed-derived identity — localStorage already holds the seed that key comes
// from — but it is a second copy, and it exists only to keep strangers from
// buzzing the phone. A remote signer (bunker/extension) never hands over its
// key: those wallets store no secret here and fall back to a generic
// notification instead of a filtered one.
import { unwrapDM } from './dm.js';
const DB = 'coinos-dm-inbox';
const STORE = 'inbox';
const VERSION = 1;
function openDb() {
return new Promise((resolve, reject) => {
if (typeof indexedDB === 'undefined') return reject(new Error('IndexedDB unavailable'));
const req = indexedDB.open(DB, VERSION);
req.onupgradeneeded = () => {
const db = req.result;
if (!db.objectStoreNames.contains(STORE)) db.createObjectStore(STORE);
};
req.onsuccess = () => resolve(req.result);
req.onerror = () => reject(req.error);
});
}
async function tx(mode, fn) {
const db = await openDb();
try {
return await new Promise((resolve, reject) => {
const t = db.transaction(STORE, mode);
const s = t.objectStore(STORE);
let out;
Promise.resolve(fn(s)).then((v) => { out = v; }).catch(reject);
t.oncomplete = () => resolve(out);
t.onerror = () => reject(t.error);
t.onabort = () => reject(t.error);
});
} finally { db.close(); }
}
// One record per wallet: { sk, pubkey, follows: [hex], names: { hex: name } }.
// `sk` is null when the identity lives behind a remote signer.
export async function saveInbox(walletKey, rec) {
return tx('readwrite', (s) => { s.put(rec, walletKey); });
}
export async function clearInbox(walletKey) {
return tx('readwrite', (s) => { s.delete(walletKey); });
}
export async function allInboxes() {
try {
return await tx('readonly', (s) => new Promise((res, rej) => {
const out = [];
const cur = s.openCursor();
cur.onsuccess = () => {
const c = cur.result;
if (!c) return res(out);
out.push(c.value);
c.continue();
};
cur.onerror = () => rej(cur.error);
}));
} catch { return []; }
}
const unhex = (h) => Uint8Array.from(h.match(/.{2}/g).map((b) => parseInt(b, 16)));
// Open a wrap against every identity we hold a key for. Returns
// { author, followed, name, mine } for the first one that opens it, or null
// if none can — which includes every remote-signer wallet, so a null means
// "we don't know", never "it's a stranger".
export async function classifyDm(wrap, inboxes) {
for (const rec of inboxes) {
if (!rec || !rec.sk) continue;
let sk;
try { sk = unhex(rec.sk); } catch { continue; }
const opened = await unwrapDM(wrap, sk);
if (!opened) continue;
const author = opened.author;
return {
author,
mine: author === rec.pubkey,
followed: (rec.follows || []).includes(author),
// Someone you're already talking to is not a stranger, whether or not
// you ever followed them.
known: (rec.known || []).includes(author),
// No contact list published at all: there's nothing to filter against,
// and silence would be worse than noise.
hasList: !!rec.hasList,
name: (rec.names || {})[author] || null,
content: opened.rumor && opened.rumor.kind === 14 ? opened.rumor.content : '',
};
}
return null;
}
// Should this DM interrupt someone? Our own sent-copy never should — every
// NIP-17 message is wrapped to the sender too, and being notified about what
// you just typed is pure noise. Anything we couldn't open stays notifiable:
// better a generic buzz than a silent drop.
export function shouldNotifyDm(verdict) {
if (!verdict) return true;
if (verdict.mine) return false;
if (verdict.followed || verdict.known) return true;
return !verdict.hasList;
}
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