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import { getWalletEntropy } from "$lib/walletEntropy";
import { signer } from "$lib/store";
export async function deriveNostrKey(entropy: ArrayBuffer) {
const [{ entropyToMnemonic }, { wordlist }, { privateKeyFromSeedWords }, { getPublicKey }] =
await Promise.all([
import("@scure/bip39"),
import("@scure/bip39/wordlists/english.js"),
import("nostr-tools/nip06"),
import("nostr-tools/pure"),
]);
const ent = new Uint8Array(entropy).slice(0, 16);
const mnemonic = entropyToMnemonic(ent, wordlist);
const sk = privateKeyFromSeedWords(mnemonic);
const pubkey = getPublicKey(sk);
return { sk, pubkey };
}
export async function autoUnlockNostr(userPubkey: string) {
if (localStorage.getItem("nsec")) return;
const entropy = await getWalletEntropy();
if (!entropy) return;
try {
const { sk, pubkey } = await deriveNostrKey(entropy);
if (pubkey !== userPubkey) return;
const nip19 = await import("nostr-tools/nip19");
const { bytesToHex } = await import("@noble/hashes/utils.js");
localStorage.setItem("nsec", nip19.nsecEncode(sk));
signer.set({
method: "nsec",
params: { sk: bytesToHex(sk), pk: pubkey },
ready: true,
});
} catch (e) {
console.error("Nostr auto-unlock failed:", e);
}
}
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