99 lines
2.1 KiB
JavaScript
99 lines
2.1 KiB
JavaScript
/*!
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* program.js - program object for bcoin
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* Copyright (c) 2014-2015, Fedor Indutny (MIT License)
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* Copyright (c) 2014-2017, Christopher Jeffrey (MIT License).
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* https://github.com/bcoin-org/bcoin
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*/
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'use strict';
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const assert = require('assert');
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const common = require('./common');
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const scriptTypes = common.types;
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/**
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* Witness Program
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* @alias module:script.Program
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* @property {Number} version - Ranges from 0 to 16.
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* @property {String|null} type - Null if malformed.
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* @property {Buffer} data - The hash (for now).
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*/
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class Program {
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/**
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* Create a witness program.
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* @constructor
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* @param {Number} version
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* @param {Buffer} data
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*/
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constructor(version, data) {
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assert((version & 0xff) === version);
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assert(version >= 0 && version <= 16);
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assert(Buffer.isBuffer(data));
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assert(data.length >= 2 && data.length <= 40);
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this.version = version;
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this.data = data;
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}
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/**
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* Get the witness program type.
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* @returns {ScriptType}
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*/
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getType() {
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if (this.version === 0) {
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if (this.data.length === 20)
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return scriptTypes.WITNESSPUBKEYHASH;
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if (this.data.length === 32)
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return scriptTypes.WITNESSSCRIPTHASH;
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// Fail on bad version=0
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return scriptTypes.WITNESSMALFORMED;
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}
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// No interpretation of script (anyone can spend)
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return scriptTypes.NONSTANDARD;
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}
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/**
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* Test whether the program is either
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* an unknown version or malformed.
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* @returns {Boolean}
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*/
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isUnknown() {
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const type = this.getType();
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return type === scriptTypes.WITNESSMALFORMED
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|| type === scriptTypes.NONSTANDARD;
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}
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/**
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* Test whether the program is malformed.
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* @returns {Boolean}
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*/
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isMalformed() {
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return this.getType() === scriptTypes.WITNESSMALFORMED;
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}
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/**
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* Inspect the program.
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* @returns {String}
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*/
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inspect() {
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const data = this.data.toString('hex');
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const type = common.typesByVal[this.getType()].toLowerCase();
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return `<Program: version=${this.version} data=${data} type=${type}>`;
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}
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}
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/*
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* Expose
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*/
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module.exports = Program;
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