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import { Buffer } from "buffer";
import { browser } from "$app/environment";
import { decrypted, password as pw, passwordPrompt, pin } from "$lib/store";
import { post, stretch, wait } from "$lib/utils";
import {
type EventTemplate,
finalizeEvent,
getPublicKey,
nip04,
nip19,
} from "nostr-tools";
import { get } from "svelte/store";
import {
decrypt as nip49decrypt,
encrypt as nip49encrypt,
} from "nostr-tools/nip49";
import { bech32m, hex } from "@scure/base";
import { entropyToMnemonic, mnemonicToEntropy } from "@scure/bip39";
import { wordlist } from "@scure/bip39/wordlists/english";
import { generateSeedWords, privateKeyFromSeedWords } from "nostr-tools/nip06";
type User = {
[key: string]: any;
};
type EncryptParams = {
message: string;
recipient: string;
user: User;
};
const { encode, decode, toWords, fromWords } = bech32m;
export const generate = async (user: any) => {
const p = get(pin);
if (p && p.length !== 6) return;
const salt = crypto.getRandomValues(new Uint8Array(16));
const mnemonic = generateSeedWords();
const sk = privateKeyFromSeedWords(mnemonic);
const bytes = new Uint8Array(
await crypto.subtle.encrypt(
{ name: "AES-GCM", iv: new Uint8Array(16) },
await stretch(await getPassword(), salt),
mnemonicToEntropy(mnemonic, wordlist),
),
);
user.pubkey = getPublicKey(sk);
user.cipher = encode("en", toWords(bytes), 180);
user.salt = Buffer.from(salt).toString("hex");
};
export const encrypt = async ({ message, recipient, user }: EncryptParams) => {
const sk = await getPrivateKey(user);
return nip04.encrypt(sk, recipient, message);
};
export const decrypt = async ({ event, user }) => {
const cache = get(decrypted);
try {
let { content, pubkey, id } = event;
if (cache[id]) return cache[id];
if (pubkey === user.pubkey) pubkey = event.tags[0][1];
const message = await nip04.decrypt(
await getPrivateKey(user),
pubkey,
content,
);
cache[id] = Buffer.from(message).toString("utf8");
decrypted.set(cache);
return cache[id];
} catch (e) {
// console.log(e);
}
};
export const getPrivateKey = async (user: User): Promise<Uint8Array> => {
let k;
if (browser) {
k = localStorage.getItem("nsec");
if (k) {
return nip19.decode(k).data as Uint8Array;
}
}
const { nsec } = user;
if (nsec) {
k = nip49decrypt(nsec, await getPassword());
} else k = privateKeyFromSeedWords(await getMnemonic(user));
localStorage.setItem("nsec", nip19.nsecEncode(k));
return k;
};
export const getMnemonic = async (user: User) => {
const { cipher, salt } = user;
const entropy = new Uint8Array(
await crypto.subtle.decrypt(
{ name: "AES-GCM", iv: new Uint8Array(16) },
await stretch(await getPassword(), Buffer.from(salt, "hex")),
Uint8Array.from(fromWords(decode(cipher, 180).words)),
),
);
return entropyToMnemonic(entropy, wordlist);
};
const decodeNsec = (nsec: string): Uint8Array => {
const { type, data } = nip19.decode(nsec);
if (type === "nsec" && data instanceof Uint8Array) return data;
throw new Error("invalid nsec");
};
export const getNsec = async (user: User) => {
return nip19.nsecEncode(await getPrivateKey(user));
};
export const setNsec = async (user: User, nsec: string) => {
user.pubkey = getPublicKey(decodeNsec(nsec));
user.nsec = await encryptNsec(nsec);
};
export const encryptNsec = async (nsec: string) => {
const d = decodeNsec(nsec);
return nip49encrypt(d, await getPassword());
};
type SignParams = {
event: EventTemplate;
user: User;
};
export const sign = async ({ event, user }: SignParams) => {
event = finalizeEvent(event, await getPrivateKey(user));
};
export const send = (event: EventTemplate) => {
return post("/events", { event });
};
const getPassword = async (): Promise<string> => {
if (!get(pw)) passwordPrompt.set(true);
await wait(() => !!get(pw));
return get(pw) || "";
};
export const reEncryptEntropy = async (user: User, newPassword: string) => {
const { cipher, salt } = user;
const entropy = await crypto.subtle.decrypt(
{ name: "AES-GCM", iv: new Uint8Array(16) },
await stretch(await getPassword(), hex.decode(salt)),
Uint8Array.from(fromWords(decode(cipher, 180).words)),
);
const bytes = new Uint8Array(
await crypto.subtle.encrypt(
{ name: "AES-GCM", iv: new Uint8Array(16) },
await stretch(newPassword, hex.decode(salt)),
entropy,
),
);
return encode("en", toWords(bytes), 180);
};
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