@trezor/utxo-lib/lib/script/index.js

Client-side Bitcoin-like JavaScript library

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.OPS = exports.signature = exports.number = void 0;
exports.isPushOnly = isPushOnly;
exports.compile = compile;
exports.decompile = decompile;
exports.toASM = toASM;
exports.fromASM = fromASM;
exports.toStack = toStack;
exports.isCanonicalPubKey = isCanonicalPubKey;
exports.isDefinedHashType = isDefinedHashType;
exports.isCanonicalScriptSignature = isCanonicalScriptSignature;
const tslib_1 = require("tslib");
const bip66 = tslib_1.__importStar(require("bip66"));
const pushdata_bitcoin_1 = tslib_1.__importDefault(require("pushdata-bitcoin"));
const tiny_secp256k1_1 = tslib_1.__importDefault(require("tiny-secp256k1"));
const ops_1 = require("./ops");
const scriptNumber = tslib_1.__importStar(require("./scriptNumber"));
const scriptSignature = tslib_1.__importStar(require("./scriptSignature"));
const types = tslib_1.__importStar(require("../types"));
const types_1 = require("../types");
const OP_INT_BASE = ops_1.OPS.OP_RESERVED;
function isOPInt(value) {
  return types.Number(value) && (value === ops_1.OPS.OP_0 || value >= ops_1.OPS.OP_1 && value <= ops_1.OPS.OP_16 || value === ops_1.OPS.OP_1NEGATE);
}
function isPushOnlyChunk(value) {
  return types.Buffer(value) || isOPInt(value);
}
function isPushOnly(value) {
  return types.Array(value) && value.every(isPushOnlyChunk);
}
function asMinimalOP(buffer) {
  if (buffer.length === 0) return ops_1.OPS.OP_0;
  if (buffer.length !== 1) return;
  if (buffer[0] >= 1 && buffer[0] <= 16) return OP_INT_BASE + buffer[0];
  if (buffer[0] === 0x81) return ops_1.OPS.OP_1NEGATE;
}
function compile(chunks) {
  if (types.Buffer(chunks)) return chunks;
  (0, types_1.typeforce)(types.Array, chunks);
  const bufferSize = chunks.reduce((accum, chunk) => {
    if (types.Buffer(chunk)) {
      if (chunk.length === 1 && asMinimalOP(chunk) !== undefined) {
        return accum + 1;
      }
      return accum + pushdata_bitcoin_1.default.encodingLength(chunk.length) + chunk.length;
    }
    return accum + 1;
  }, 0.0);
  const buffer = Buffer.allocUnsafe(bufferSize);
  let offset = 0;
  chunks.forEach(chunk => {
    if (types.Buffer(chunk)) {
      const opcode = asMinimalOP(chunk);
      if (opcode !== undefined) {
        buffer.writeUInt8(opcode, offset);
        offset += 1;
        return;
      }
      offset += pushdata_bitcoin_1.default.encode(buffer, chunk.length, offset);
      chunk.copy(buffer, offset);
      offset += chunk.length;
    } else {
      buffer.writeUInt8(chunk, offset);
      offset += 1;
    }
  });
  if (offset !== buffer.length) throw new Error('Could not decode chunks');
  return buffer;
}
function decompile(buffer) {
  if (types.Array(buffer)) return buffer;
  (0, types_1.typeforce)(types.Buffer, buffer);
  const chunks = [];
  let i = 0;
  while (i < buffer.length) {
    const opcode = buffer[i];
    if (opcode > ops_1.OPS.OP_0 && opcode <= ops_1.OPS.OP_PUSHDATA4) {
      const d = pushdata_bitcoin_1.default.decode(buffer, i);
      if (d === null) return [];
      i += d.size;
      if (i + d.number > buffer.length) return [];
      const data = buffer.subarray(i, i + d.number);
      i += d.number;
      const op = asMinimalOP(data);
      if (op !== undefined) {
        chunks.push(op);
      } else {
        chunks.push(data);
      }
    } else {
      chunks.push(opcode);
      i += 1;
    }
  }
  return chunks;
}
function toASM(chunks) {
  if (types.Buffer(chunks)) {
    chunks = decompile(chunks);
  }
  return chunks.map(chunk => {
    if (types.Buffer(chunk)) {
      const op = asMinimalOP(chunk);
      if (op === undefined) return chunk.toString('hex');
      chunk = op;
    }
    return ops_1.REVERSE_OPS[chunk];
  }).join(' ');
}
function fromASM(asm) {
  (0, types_1.typeforce)(types.String, asm);
  return compile(asm.split(' ').map(chunkStr => {
    if (ops_1.OPS[chunkStr] !== undefined) return ops_1.OPS[chunkStr];
    (0, types_1.typeforce)(types.Hex, chunkStr);
    return Buffer.from(chunkStr, 'hex');
  }));
}
function toStack(chunks0) {
  const chunks = decompile(chunks0);
  (0, types_1.typeforce)(isPushOnly, chunks);
  return chunks?.map(op => {
    if (types.Buffer(op)) return op;
    if (op === ops_1.OPS.OP_0) return Buffer.allocUnsafe(0);
    return scriptNumber.encode(op - OP_INT_BASE);
  });
}
function isCanonicalPubKey(buffer) {
  return tiny_secp256k1_1.default.isPoint(buffer);
}
function isDefinedHashType(hashType) {
  const hashTypeMod = hashType & ~0x80;
  return hashTypeMod > 0x00 && hashTypeMod < 0x04;
}
function isCanonicalScriptSignature(buffer) {
  if (!types.Buffer(buffer)) return false;
  if (!isDefinedHashType(buffer[buffer.length - 1])) return false;
  return bip66.check(buffer.subarray(0, -1));
}
exports.number = scriptNumber;
exports.signature = scriptSignature;
var ops_2 = require("./ops");
Object.defineProperty(exports, "OPS", {
  enumerable: true,
  get: function () {
    return ops_2.OPS;
  }
});
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