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import { encodeBase64ToJson, encodeJsonToBase64 } from './base64.js';
import {
AmountPreference,
InvoiceData,
MintKeys,
Proof,
Token,
TokenEntry,
TokenV2
} from './model/types/index.js';
import { TOKEN_PREFIX, TOKEN_VERSION } from './utils/Constants.js';
import { bytesToHex } from '@noble/curves/abstract/utils';
import { sha256 } from '@noble/hashes/sha256';
import { Buffer } from 'buffer/';
function splitAmount(value: number, amountPreference?: Array<AmountPreference>): Array<number> {
const chunks: Array<number> = [];
if (amountPreference) {
chunks.push(...getPreference(value, amountPreference));
value =
value -
chunks.reduce((curr, acc) => {
return curr + acc;
}, 0);
}
for (let i = 0; i < 32; i++) {
const mask: number = 1 << i;
if ((value & mask) !== 0) {
chunks.push(Math.pow(2, i));
}
}
return chunks;
}
function isPowerOfTwo(number: number) {
return number && !(number & (number - 1));
}
function getPreference(amount: number, preferredAmounts: Array<AmountPreference>): Array<number> {
const chunks: Array<number> = [];
let accumulator = 0;
preferredAmounts.forEach((pa) => {
if (!isPowerOfTwo(pa.amount)) {
throw new Error(
'Provided amount preferences contain non-power-of-2 numbers. Use only ^2 numbers'
);
}
for (let i = 1; i <= pa.count; i++) {
accumulator += pa.amount;
if (accumulator > amount) {
return;
}
chunks.push(pa.amount);
}
});
return chunks;
}
function getDefaultAmountPreference(amount: number): Array<AmountPreference> {
const amounts = splitAmount(amount);
return amounts.map((a) => {
return { amount: a, count: 1 };
});
}
function bytesToNumber(bytes: Uint8Array): bigint {
return hexToNumber(bytesToHex(bytes));
}
function hexToNumber(hex: string): bigint {
return BigInt(`0x${hex}`);
}
//used for json serialization
function bigIntStringify<T>(_key: unknown, value: T) {
return typeof value === 'bigint' ? value.toString() : value;
}
/**
* Helper function to encode a v3 cashu token
* @param token
* @returns
*/
function getEncodedToken(token: Token): string {
return TOKEN_PREFIX + TOKEN_VERSION + encodeJsonToBase64(token);
}
/**
* Helper function to decode cashu tokens into object
* @param token an encoded cashu token (cashuAey...)
* @returns cashu token object
*/
function getDecodedToken(token: string): Token {
// remove prefixes
const uriPrefixes = ['web+cashu://', 'cashu://', 'cashu:', 'cashuA'];
uriPrefixes.forEach((prefix) => {
if (!token.startsWith(prefix)) {
return;
}
token = token.slice(prefix.length);
});
return handleTokens(token);
}
/**
* @param token
* @returns
*/
function handleTokens(token: string): Token {
const obj = encodeBase64ToJson<TokenV2 | Array<Proof> | Token>(token);
// check if v3
if ('token' in obj) {
return obj;
}
// check if v1
if (Array.isArray(obj)) {
return { token: [{ proofs: obj, mint: '' }] };
}
// if v2 token return v3 format
return { token: [{ proofs: obj.proofs, mint: obj?.mints[0]?.url ?? '' }] };
}
/**
* Returns the keyset id of a set of keys
* @param keys keys object to derive keyset id from
* @returns
*/
export function deriveKeysetId(keys: MintKeys) {
const pubkeysConcat = Object.entries(keys)
.sort((a, b) => +a[0] - +b[0])
.map(([, pubKey]) => pubKey)
.join('');
const hash = sha256(new TextEncoder().encode(pubkeysConcat));
return Buffer.from(hash).toString('base64').slice(0, 12);
}
/**
* merge proofs from same mint,
* removes TokenEntrys with no proofs or no mint field
* and sorts proofs by id
*
* @export
* @param {Token} token
* @return {*} {Token}
*/
export function cleanToken(token: Token): Token {
const tokenEntryMap: { [key: string]: TokenEntry } = {};
for (const tokenEntry of token.token) {
if (!tokenEntry?.proofs?.length || !tokenEntry?.mint) {
continue;
}
if (tokenEntryMap[tokenEntry.mint]) {
tokenEntryMap[tokenEntry.mint].proofs.push(...[...tokenEntry.proofs]);
continue;
}
tokenEntryMap[tokenEntry.mint] = {
mint: tokenEntry.mint,
proofs: [...tokenEntry.proofs]
};
}
return {
memo: token?.memo,
token: Object.values(tokenEntryMap).map((x) => ({
...x,
proofs: sortProofsById(x.proofs)
}))
};
}
export function sortProofsById(proofs: Array<Proof>) {
return proofs.sort((a, b) => a.id.localeCompare(b.id));
}
export function isObj(v: unknown): v is object {
return typeof v === 'object';
}
export function checkResponse(data: { error?: string; detail?: string }) {
Iif (!isObj(data)) return;
Iif ('error' in data && data.error) {
throw new Error(data.error);
}
Iif ('detail' in data && data.detail) {
throw new Error(data.detail);
}
}
export function joinUrls(...parts: Array<string>): string {
return parts.map((part) => part.replace(/(^\/+|\/+$)/g, '')).join('/');
}
export function decodeInvoice(bolt11Invoice: string): InvoiceData {
const invoiceData: InvoiceData = {} as InvoiceData;
const decodeResult = decode(bolt11Invoice);
invoiceData.paymentRequest = decodeResult.paymentRequest;
for (let i = 0; i < decodeResult.sections.length; i++) {
const decodedSection = decodeResult.sections[i];
if (decodedSection.name === 'amount') {
invoiceData.amountInSats = Number(decodedSection.value) / 1000;
invoiceData.amountInMSats = Number(decodedSection.value);
}
if (decodedSection.name === 'timestamp') {
invoiceData.timestamp = decodedSection.value;
}
if (decodedSection.name === 'description') {
invoiceData.memo = decodedSection.value;
}
if (decodedSection.name === 'expiry') {
invoiceData.expiry = decodedSection.value;
}
if (decodedSection.name === 'payment_hash') {
invoiceData.paymentHash = decodedSection.value.toString('hex');
}
}
return invoiceData;
}
export {
bigIntStringify,
bytesToNumber,
getDecodedToken,
getEncodedToken,
hexToNumber,
splitAmount,
getDefaultAmountPreference
};
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