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116 lines
3.1 KiB
116 lines
3.1 KiB
'use strict';
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// 90.2% typed (by google's closure-compiler account)
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var preconditions = require('preconditions').singleton();
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var _ = require('lodash');
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/**
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* @namespace
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* @desc
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* HDPath contains helper functions to handle BIP32 branches as
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* Copay uses them.
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* Based on https://github.com/maraoz/bips/blob/master/bip-NNNN.mediawiki
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* <pre>
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* m / purpose' / copayerIndex / change:boolean / addressIndex
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* </pre>
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*/
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var HDPath = {};
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/**
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* @desc Copay's BIP45 purpose code
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* @const
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* @type number
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*/
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HDPath.PURPOSE = 45;
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/**
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* @desc Maximum number for non-hardened values (BIP32)
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* @const
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* @type number
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*/
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HDPath.MAX_NON_HARDENED = 0x80000000 - 1;
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/**
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* @desc Shared Index: used for creating addresses for no particular purpose
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* @const
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* @type number
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*/
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HDPath.SHARED_INDEX = HDPath.MAX_NON_HARDENED - 0;
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/**
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* @desc ???
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* @const
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* @type number
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*/
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HDPath.ID_INDEX = HDPath.MAX_NON_HARDENED - 1;
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/**
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* @desc BIP45 prefix for COPAY
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* @const
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* @type string
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*/
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HDPath.BIP45_PUBLIC_PREFIX = 'm/' + HDPath.PURPOSE + '\'';
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/**
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* @desc Retrieve a string to be used with bitcore representing a Copay branch
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* @param {number} addressIndex - the last value of the HD derivation
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* @param {boolean} isChange - whether this is a change address or a receive
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* @param {number} copayerIndex - the index of the copayer in the pubkeyring
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* @return {string} - the path for the HD derivation
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*/
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HDPath.Branch = function(addressIndex, isChange, copayerIndex) {
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preconditions.checkArgument(_.isNumber(addressIndex));
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preconditions.checkArgument(_.isBoolean(isChange));
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var ret = 'm/' +
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(typeof copayerIndex !== 'undefined' ? copayerIndex : HDPath.SHARED_INDEX) + '/' +
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(isChange ? 1 : 0) + '/' +
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addressIndex;
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return ret;
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};
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/**
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* @desc ???
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* @param {number} addressIndex - the last value of the HD derivation
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* @param {boolean} isChange - whether this is a change address or a receive
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* @param {number} copayerIndex - the index of the copayer in the pubkeyring
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* @return {string} - the path for the HD derivation
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*/
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HDPath.FullBranch = function(addressIndex, isChange, copayerIndex) {
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preconditions.checkArgument(_.isNumber(addressIndex));
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preconditions.checkArgument(_.isBoolean(isChange));
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var sub = HDPath.Branch(addressIndex, isChange, copayerIndex);
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sub = sub.substring(2);
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return HDPath.BIP45_PUBLIC_PREFIX + '/' + sub;
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};
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/**
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* @desc
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* Decompose a string and retrieve its arguments as if it where a Copay address.
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* @param {string} path - the HD path
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* @returns {Object} an object with three keys: addressIndex, isChange, and
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* copayerIndex
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*/
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HDPath.indexesForPath = function(path) {
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preconditions.checkArgument(_.isString(path));
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var s = path.split('/');
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return {
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isChange: s[3] === '1',
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addressIndex: parseInt(s[4], 10),
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copayerIndex: parseInt(s[2], 10)
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};
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};
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/**
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* @desc The ID for a shared branch
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*/
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HDPath.IdFullBranch = HDPath.FullBranch(0, false, HDPath.ID_INDEX);
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/**
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* @desc Partial ID for a shared branch
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*/
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HDPath.IdBranch = HDPath.Branch(0, false, HDPath.ID_INDEX);
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module.exports = HDPath;
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