@node-lightning/wire/dist/ScriptUtils.js

Lightning Network Wire Protocol

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.fundingScript = void 0;
const bufio_1 = require("@node-lightning/bufio");
const crypto_1 = require("@node-lightning/crypto");
const OP_0 = 0;
const OP_CHECKMULTISIG = 174;
function fundingScript(pubkeys) {
    const lower = lesser(pubkeys[0], pubkeys[1]);
    let node1;
    let node2;
    if (lower === -1) {
        node1 = pubkeys[0];
        node2 = pubkeys[1];
    }
    else {
        node1 = pubkeys[1];
        node2 = pubkeys[0];
    }
    const script = p2msScript(2, 2, [node1, node2]);
    const hash = crypto_1.sha256(script);
    return p2wshScript(hash);
}
exports.fundingScript = fundingScript;
function lesser(a, b) {
    for (let i = 0; i < a.length; i++) {
        if (a[i] < b[i])
            return -1;
        if (a[i] > b[i])
            return 1;
    }
    return 0;
}
function compileScript(chunks) {
    let bufferSize = 0;
    for (const chunk of chunks) {
        if (Buffer.isBuffer(chunk)) {
            bufferSize += 1; // length
            bufferSize += chunk.length; // chunk length < 76 bytes
        }
        else {
            bufferSize += 1; // opcode
        }
    }
    const buffer = Buffer.alloc(bufferSize);
    const writer = new bufio_1.BufferWriter(buffer);
    for (const chunk of chunks) {
        if (Buffer.isBuffer(chunk)) {
            writer.writeUInt8(chunk.length); // chunk length < 76 bytes
            writer.writeBytes(chunk);
        }
        else {
            writer.writeUInt8(chunk);
        }
    }
    return buffer;
}
function p2msScript(m, n, pubkeys) {
    return compileScript([
        80 + m,
        ...pubkeys,
        80 + n,
        OP_CHECKMULTISIG,
    ]); // prettier-ignore
}
function p2wshScript(hash160Script) {
    return compileScript([
        OP_0,
        hash160Script,
    ]); // prettier-ignore
}
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