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import { get } from "svelte/store";
import { Buffer } from "buffer";
import { fail, wait, post, stretch } from "$lib/utils";
import {
decrypted,
password as pw,
passwordPrompt,
pin,
loginRedirect,
} from "$lib/store";
import { goto, invalidate } from "$app/navigation";
import {
getPublicKey,
signEvent,
getEventHash,
nip04,
nip06,
nip19,
} from "nostr-tools";
import { mnemonicToEntropy, entropyToMnemonic } from "@scure/bip39";
import wordlist from "$lib/english";
import { bech32m } from "@scure/base";
const { generateSeedWords, privateKeyFromSeedWords } = nip06;
const { encode, decode, toWords, fromWords } = bech32m;
export let generate = async (user) => {
if (!get(pin)?.length === 6) return;
let password = get(pw);
let salt = crypto.getRandomValues(new Uint8Array(16));
let mnemonic = generateSeedWords();
let sk = privateKeyFromSeedWords(mnemonic);
let bytes = new Uint8Array(
await crypto.subtle.encrypt(
{ name: "AES-GCM", iv: new Uint8Array(16) },
await stretch(password, salt),
Uint8Array.from(Buffer.from(mnemonicToEntropy(mnemonic, wordlist), "hex"))
)
);
user.pubkey = getPublicKey(sk);
user.cipher = encode("en", toWords(bytes), 180);
user.salt = Buffer.from(salt).toString("hex");
};
export let encrypt = async ({ message, recipient, user }) => {
return nip04.encrypt(await getPrivateKey(user), recipient, message);
};
export let decrypt = async ({ event, user }) => {
let cache = get(decrypted);
try {
let { content, pubkey, id } = event;
if (cache[id]) return cache[id];
if (pubkey === user.pubkey) pubkey = event.tags[0][1];
let 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);
}
};
function typedArrayToBuffer(array) {
return array.buffer.slice(
array.byteOffset,
array.byteLength + array.byteOffset
);
}
export let getMnemonic = async (user) => {
let { cipher, username, salt } = user;
let password = get(pw);
if (!password) {
passwordPrompt.set(true);
}
try {
await post("/password", { password });
} catch (e) {
passwordPrompt.set(true);
}
await wait(() => !!get(pw));
password = get(pw);
let mnemonic, key, seed, entropy, child, privkey;
entropy = new Uint8Array(
await crypto.subtle.decrypt(
{ name: "AES-GCM", iv: new Uint8Array(16) },
await stretch(password, Buffer.from(salt, "hex")),
Uint8Array.from(fromWords(decode(cipher, 180).words))
)
);
return entropyToMnemonic(entropy, wordlist);
};
let getPrivateKey = async (user) => {
return privateKeyFromSeedWords(await getMnemonic(user));
};
export let getNsec = async (user) => {
return nip19.nsecEncode(await getPrivateKey(user));
};
export let sign = async ({ event, user }) => {
event.id = getEventHash(event);
event.sig = signEvent(event, await getPrivateKey(user));
};
export let send = (event) => {
return post("/events", { event });
};
export let reEncryptEntropy = async (user, newPassword) => {
let { cipher, username, salt } = user;
let password = get(pw);
if (!password) {
passwordPrompt.set(true);
}
try {
await post("/password", { password });
} catch (e) {
passwordPrompt.set(true);
}
await wait(() => !!get(pw));
password = get(pw);
let mnemonic, key, seed, entropy, child, privkey;
entropy = Buffer.from(
await crypto.subtle.decrypt(
{ name: "AES-GCM", iv: new Uint8Array(16) },
await stretch(password, Buffer.from(salt, "hex")),
Uint8Array.from(fromWords(decode(cipher, 180).words))
),
"hex"
).toString("hex");
let bytes = new Uint8Array(
await crypto.subtle.encrypt(
{ name: "AES-GCM", iv: new Uint8Array(16) },
await stretch(newPassword, Buffer.from(salt, "hex")),
Uint8Array.from(Buffer.from(entropy, "hex"))
)
);
return encode("en", toWords(bytes), 180);
};
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