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/* eslint-disable @typescript-eslint/no-unsafe-member-access */
import bech32 from "bech32";
import * as bech32Util from "./bech32-util";
import * as crypto from "./crypto";
import { encodePico } from "./encode-pico";
import { FIELD_TYPE } from "./field-type";
import { Invoice } from "./invoice";
import { WordCursor } from "./word-cursor";
/**
* Encodes an invoice object into the bech32 invoice and digitally
* signs the invoice using ECDSA.
* @param invoice
* @param privKey 33-byte secp256k1 private key
* @returns {string} bech32 encoded invoice
*/
export function encode(invoice: Invoice, privKey: Buffer) {
const writer = new WordCursor();
const encodedAmount = encodePico(invoice._value ? invoice._value.toString() : null) || "";
const prefix = `ln${invoice.network}${encodedAmount}`;
writer.writeUIntBE(invoice.timestamp, 7);
_encodeData(invoice, writer);
// generate sig data
const bytes = bech32Util.convertWords(writer.words, 5, 8, true);
const sigData = Buffer.concat([Buffer.from(prefix, "utf8"), Buffer.from(bytes)]);
// generate sig hash
const sigHash = crypto.sha256(sigData);
// sign
const { signature, recovery } = crypto.ecdsaSign(sigHash, privKey);
writer.writeBytes(signature);
writer.writeUIntBE(recovery, 1);
// finally encode the invoice in bech32 and allow
// an invoice to be any length
return bech32.encode(prefix, writer.words, Number.MAX_SAFE_INTEGER);
}
function _encodeData(invoice: Invoice, writer: WordCursor) {
for (const datum of invoice.fields) {
switch (datum.type) {
case FIELD_TYPE.PAYMENT_HASH:
{
// should be 52, but allow for creation of variable length
// values so we can construct non-valid invoices for testing
const dataLen = bech32Util.sizeofBytes(datum.value.byteLength);
writer.writeUIntBE(datum.type, 1);
writer.writeUIntBE(dataLen, 2);
writer.writeBytes(datum.value);
}
break;
case FIELD_TYPE.ROUTE:
{
const bits = datum.value.length * (264 + 64 + 32 + 32 + 16);
writer.writeUIntBE(datum.type, 1);
const dataLen = bech32Util.sizeofBits(bits);
writer.writeUIntBE(dataLen, 2);
const buffer = Buffer.alloc(bits / 8);
let position = 0;
for (const route of datum.value) {
route.pubkey.copy(buffer, position);
position += 264 / 8;
route.short_channel_id.copy(buffer, position);
position += 64 / 8;
buffer.writeUInt32BE(route.fee_base_msat, position);
position += 32 / 8;
buffer.writeUInt32BE(route.fee_proportional_millionths, position);
position += 32 / 8;
buffer.writeUInt16BE(route.cltv_expiry_delta, position);
position += 16 / 8;
}
writer.writeBytes(buffer);
}
break;
case FIELD_TYPE.EXPIRY:
{
const dataLen = bech32Util.sizeofNum(datum.value);
writer.writeUIntBE(datum.type, 1);
writer.writeUIntBE(dataLen, 2);
writer.writeUIntBE(datum.value, dataLen);
}
break;
case FIELD_TYPE.FALLBACK_ADDRESS:
{
const dataLen = bech32Util.sizeofBytes(datum.value.address.byteLength) + 1;
writer.writeUIntBE(datum.type, 1);
writer.writeUIntBE(dataLen, 2);
writer.writeUIntBE(datum.value.version, 1);
writer.writeBytes(datum.value.address);
}
break;
case FIELD_TYPE.SHORT_DESC:
{
const buf = Buffer.from(datum.value, "utf8");
const dataLen = bech32Util.sizeofBytes(buf.byteLength);
writer.writeUIntBE(datum.type, 1);
writer.writeUIntBE(dataLen, 2);
writer.writeBytes(buf);
}
break;
case FIELD_TYPE.PAYEE_NODE:
{
// should be 53, but allow for creation of variable length
// values so we can construct non-valid invoices for testing
const dataLen = bech32Util.sizeofBytes(datum.value.byteLength);
writer.writeUIntBE(datum.type, 1);
writer.writeUIntBE(dataLen, 2);
writer.writeBytes(datum.value);
}
break;
case FIELD_TYPE.HASH_DESC:
{
const dataLen = bech32Util.sizeofBytes(datum.value.byteLength);
writer.writeUIntBE(datum.type, 1);
writer.writeUIntBE(dataLen, 2);
writer.writeBytes(datum.value);
}
break;
case FIELD_TYPE.MIN_FINAL_CLTV_EXPIRY:
{
const dataLen = bech32Util.sizeofNum(datum.value);
writer.writeUIntBE(datum.type, 1);
writer.writeUIntBE(dataLen, 2);
writer.writeUIntBE(datum.value, dataLen);
}
break;
default: {
Iif (!(datum.value instanceof Buffer)) {
throw new Error("Cannot process unknown field");
}
const dataLen = bech32Util.sizeofBytes(datum.value.byteLength);
writer.writeUIntBE(datum.type, 1);
writer.writeUIntBE(dataLen, 2);
writer.writeBytes(datum.value);
}
}
}
}
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