bitcoinjs-lib/src/payments/p2ms.js

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const networks_1 = require("../networks");
const bscript = require("../script");
const lazy = require("./lazy");
const OPS = bscript.OPS;
const typef = require('typeforce');
const ecc = require('tiny-secp256k1');
const OP_INT_BASE = OPS.OP_RESERVED; // OP_1 - 1
function stacksEqual(a, b) {
    if (a.length !== b.length)
        return false;
    return a.every((x, i) => {
        return x.equals(b[i]);
    });
}
// input: OP_0 [signatures ...]
// output: m [pubKeys ...] n OP_CHECKMULTISIG
function p2ms(a, opts) {
    if (!a.input &&
        !a.output &&
        !(a.pubkeys && a.m !== undefined) &&
        !a.signatures)
        throw new TypeError('Not enough data');
    opts = Object.assign({ validate: true }, opts || {});
    function isAcceptableSignature(x) {
        return (bscript.isCanonicalScriptSignature(x) ||
            (opts.allowIncomplete && x === OPS.OP_0) !== undefined);
    }
    typef({
        network: typef.maybe(typef.Object),
        m: typef.maybe(typef.Number),
        n: typef.maybe(typef.Number),
        output: typef.maybe(typef.Buffer),
        pubkeys: typef.maybe(typef.arrayOf(ecc.isPoint)),
        signatures: typef.maybe(typef.arrayOf(isAcceptableSignature)),
        input: typef.maybe(typef.Buffer),
    }, a);
    const network = a.network || networks_1.bitcoin;
    const o = { network };
    let chunks = [];
    let decoded = false;
    function decode(output) {
        if (decoded)
            return;
        decoded = true;
        chunks = bscript.decompile(output);
        o.m = chunks[0] - OP_INT_BASE;
        o.n = chunks[chunks.length - 2] - OP_INT_BASE;
        o.pubkeys = chunks.slice(1, -2);
    }
    lazy.prop(o, 'output', () => {
        if (!a.m)
            return;
        if (!o.n)
            return;
        if (!a.pubkeys)
            return;
        return bscript.compile([].concat(OP_INT_BASE + a.m, a.pubkeys, OP_INT_BASE + o.n, OPS.OP_CHECKMULTISIG));
    });
    lazy.prop(o, 'm', () => {
        if (!o.output)
            return;
        decode(o.output);
        return o.m;
    });
    lazy.prop(o, 'n', () => {
        if (!o.pubkeys)
            return;
        return o.pubkeys.length;
    });
    lazy.prop(o, 'pubkeys', () => {
        if (!a.output)
            return;
        decode(a.output);
        return o.pubkeys;
    });
    lazy.prop(o, 'signatures', () => {
        if (!a.input)
            return;
        return bscript.decompile(a.input).slice(1);
    });
    lazy.prop(o, 'input', () => {
        if (!a.signatures)
            return;
        return bscript.compile([OPS.OP_0].concat(a.signatures));
    });
    lazy.prop(o, 'witness', () => {
        if (!o.input)
            return;
        return [];
    });
    // extended validation
    if (opts.validate) {
        if (a.output) {
            decode(a.output);
            if (!typef.Number(chunks[0]))
                throw new TypeError('Output is invalid');
            if (!typef.Number(chunks[chunks.length - 2]))
                throw new TypeError('Output is invalid');
            if (chunks[chunks.length - 1] !== OPS.OP_CHECKMULTISIG)
                throw new TypeError('Output is invalid');
            if (o.m <= 0 || o.n > 16 || o.m > o.n || o.n !== chunks.length - 3)
                throw new TypeError('Output is invalid');
            if (!o.pubkeys.every(x => ecc.isPoint(x)))
                throw new TypeError('Output is invalid');
            if (a.m !== undefined && a.m !== o.m)
                throw new TypeError('m mismatch');
            if (a.n !== undefined && a.n !== o.n)
                throw new TypeError('n mismatch');
            if (a.pubkeys && !stacksEqual(a.pubkeys, o.pubkeys))
                throw new TypeError('Pubkeys mismatch');
        }
        if (a.pubkeys) {
            if (a.n !== undefined && a.n !== a.pubkeys.length)
                throw new TypeError('Pubkey count mismatch');
            o.n = a.pubkeys.length;
            if (o.n < o.m)
                throw new TypeError('Pubkey count cannot be less than m');
        }
        if (a.signatures) {
            if (a.signatures.length < o.m)
                throw new TypeError('Not enough signatures provided');
            if (a.signatures.length > o.m)
                throw new TypeError('Too many signatures provided');
        }
        if (a.input) {
            if (a.input[0] !== OPS.OP_0)
                throw new TypeError('Input is invalid');
            if (o.signatures.length === 0 ||
                !o.signatures.every(isAcceptableSignature))
                throw new TypeError('Input has invalid signature(s)');
            if (a.signatures && !stacksEqual(a.signatures, o.signatures))
                throw new TypeError('Signature mismatch');
            if (a.m !== undefined && a.m !== a.signatures.length)
                throw new TypeError('Signature count mismatch');
        }
    }
    return Object.assign(o, a);
}
exports.p2ms = p2ms;