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Текущая директория: /usr/lib/node_modules/bitgo/node_modules/stellar-base/lib
Просмотр файла: asset.js
'use strict';
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.Asset = undefined;
var _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();
var _clone = require('lodash/clone');
var _clone2 = _interopRequireDefault(_clone);
var _padEnd = require('lodash/padEnd');
var _padEnd2 = _interopRequireDefault(_padEnd);
var _trimEnd = require('lodash/trimEnd');
var _trimEnd2 = _interopRequireDefault(_trimEnd);
var _xdr = require('./xdr');
var _xdr2 = _interopRequireDefault(_xdr);
var _keypair = require('./keypair');
var _strkey = require('./strkey');
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
/**
* Asset class represents an asset, either the native asset (`XLM`)
* or an asset code / issuer account ID pair.
*
* An asset code describes an asset code and issuer pair. In the case of the native
* asset XLM, the issuer will be null.
*
* @constructor
* @param {string} code - The asset code.
* @param {string} issuer - The account ID of the issuer.
*/
var Asset = exports.Asset = function () {
function Asset(code, issuer) {
_classCallCheck(this, Asset);
if (!/^[a-zA-Z0-9]{1,12}$/.test(code)) {
throw new Error('Asset code is invalid (maximum alphanumeric, 12 characters at max)');
}
if (String(code).toLowerCase() !== 'xlm' && !issuer) {
throw new Error('Issuer cannot be null');
}
if (issuer && !_strkey.StrKey.isValidEd25519PublicKey(issuer)) {
throw new Error('Issuer is invalid');
}
if (String(code).toLowerCase() === 'xlm') {
// transform all xLM, Xlm, etc. variants -> XLM
this.code = 'XLM';
} else {
this.code = code;
}
this.issuer = issuer;
}
/**
* Returns an asset object for the native asset.
* @Return {Asset}
*/
_createClass(Asset, [{
key: 'toXDRObject',
/**
* Returns the xdr.Asset object for this asset.
* @returns {xdr.Asset} XDR asset object
*/
value: function toXDRObject() {
return this._toXDRObject(_xdr2.default.Asset);
}
/**
* Returns the xdr.ChangeTrustAsset object for this asset.
* @returns {xdr.ChangeTrustAsset} XDR asset object
*/
}, {
key: 'toChangeTrustXDRObject',
value: function toChangeTrustXDRObject() {
return this._toXDRObject(_xdr2.default.ChangeTrustAsset);
}
/**
* Returns the xdr.TrustLineAsset object for this asset.
* @returns {xdr.TrustLineAsset} XDR asset object
*/
}, {
key: 'toTrustLineXDRObject',
value: function toTrustLineXDRObject() {
return this._toXDRObject(_xdr2.default.TrustLineAsset);
}
/**
* Returns the xdr object for this asset.
* @param {xdr.Asset | xdr.ChangeTrustAsset} xdrAsset - The asset xdr object.
* @returns {xdr.Asset | xdr.ChangeTrustAsset | xdr.TrustLineAsset} XDR Asset object
*/
}, {
key: '_toXDRObject',
value: function _toXDRObject() {
var xdrAsset = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : _xdr2.default.Asset;
if (this.isNative()) {
return xdrAsset.assetTypeNative();
}
var xdrType = void 0;
var xdrTypeString = void 0;
if (this.code.length <= 4) {
xdrType = _xdr2.default.AlphaNum4;
xdrTypeString = 'assetTypeCreditAlphanum4';
} else {
xdrType = _xdr2.default.AlphaNum12;
xdrTypeString = 'assetTypeCreditAlphanum12';
}
// pad code with null bytes if necessary
var padLength = this.code.length <= 4 ? 4 : 12;
var paddedCode = (0, _padEnd2.default)(this.code, padLength, '\0');
// eslint-disable-next-line new-cap
var assetType = new xdrType({
assetCode: paddedCode,
issuer: _keypair.Keypair.fromPublicKey(this.issuer).xdrAccountId()
});
return new xdrAsset(xdrTypeString, assetType);
}
/**
* @returns {string} Asset code
*/
}, {
key: 'getCode',
value: function getCode() {
return (0, _clone2.default)(this.code);
}
/**
* @returns {string} Asset issuer
*/
}, {
key: 'getIssuer',
value: function getIssuer() {
return (0, _clone2.default)(this.issuer);
}
/**
* @see [Assets concept](https://developers.stellar.org/docs/glossary/assets/)
* @returns {string} Asset type. Can be one of following types:
*
* - `native`,
* - `credit_alphanum4`,
* - `credit_alphanum12`, or
* - `unknown` as the error case (which should never occur)
*/
}, {
key: 'getAssetType',
value: function getAssetType() {
switch (this.getRawAssetType()) {
case _xdr2.default.AssetType.assetTypeNative():
return 'native';
case _xdr2.default.AssetType.assetTypeCreditAlphanum4():
return 'credit_alphanum4';
case _xdr2.default.AssetType.assetTypeCreditAlphanum12():
return 'credit_alphanum12';
default:
return 'unknown';
}
}
/**
* @returns {xdr.AssetType} the raw XDR representation of the asset type
*/
}, {
key: 'getRawAssetType',
value: function getRawAssetType() {
if (this.isNative()) {
return _xdr2.default.AssetType.assetTypeNative();
}
if (this.code.length <= 4) {
return _xdr2.default.AssetType.assetTypeCreditAlphanum4();
}
return _xdr2.default.AssetType.assetTypeCreditAlphanum12();
}
/**
* @returns {boolean} true if this asset object is the native asset.
*/
}, {
key: 'isNative',
value: function isNative() {
return !this.issuer;
}
/**
* @param {Asset} asset Asset to compare
* @returns {boolean} true if this asset equals the given asset.
*/
}, {
key: 'equals',
value: function equals(asset) {
return this.code === asset.getCode() && this.issuer === asset.getIssuer();
}
}, {
key: 'toString',
value: function toString() {
if (this.isNative()) {
return 'native';
}
return this.getCode() + ':' + this.getIssuer();
}
/**
* Compares two assets according to the criteria:
*
* 1. First compare the type (native < alphanum4 < alphanum12).
* 2. If the types are equal, compare the assets codes.
* 3. If the asset codes are equal, compare the issuers.
*
* @param {Asset} assetA - the first asset
* @param {Asset} assetB - the second asset
* @returns {number} `-1` if assetA < assetB, `0` if assetA == assetB, `1` if assetA > assetB.
*
* @static
* @memberof Asset
*/
}], [{
key: 'native',
value: function native() {
return new Asset('XLM');
}
/**
* Returns an asset object from its XDR object representation.
* @param {xdr.Asset} assetXdr - The asset xdr object.
* @returns {Asset}
*/
}, {
key: 'fromOperation',
value: function fromOperation(assetXdr) {
var anum = void 0;
var code = void 0;
var issuer = void 0;
switch (assetXdr.switch()) {
case _xdr2.default.AssetType.assetTypeNative():
return this.native();
case _xdr2.default.AssetType.assetTypeCreditAlphanum4():
anum = assetXdr.alphaNum4();
/* falls through */
case _xdr2.default.AssetType.assetTypeCreditAlphanum12():
anum = anum || assetXdr.alphaNum12();
issuer = _strkey.StrKey.encodeEd25519PublicKey(anum.issuer().ed25519());
code = (0, _trimEnd2.default)(anum.assetCode(), '\0');
return new this(code, issuer);
default:
throw new Error('Invalid asset type: ' + assetXdr.switch().name);
}
}
}, {
key: 'compare',
value: function compare(assetA, assetB) {
if (!assetA || !(assetA instanceof Asset)) {
throw new Error('assetA is invalid');
}
if (!assetB || !(assetB instanceof Asset)) {
throw new Error('assetB is invalid');
}
if (assetA.equals(assetB)) {
return 0;
}
// Compare asset types.
var xdrAtype = assetA.getRawAssetType().value;
var xdrBtype = assetB.getRawAssetType().value;
if (xdrAtype !== xdrBtype) {
return xdrAtype < xdrBtype ? -1 : 1;
}
// Compare asset codes.
var result = asciiCompare(assetA.getCode(), assetB.getCode());
if (result !== 0) {
return result;
}
// Compare asset issuers.
return asciiCompare(assetA.getIssuer(), assetB.getIssuer());
}
}]);
return Asset;
}();
/**
* Compares two ASCII strings in lexographic order with uppercase precedence.
*
* @param {string} a - the first string to compare
* @param {string} b - the second
* @returns {number} like all `compare()`s:
* -1 if `a < b`, 0 if `a == b`, and 1 if `a > b`
*
* @warning No type-checks are done on the parameters
*
* @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/localeCompare
*/
function asciiCompare(a, b) {
return a.localeCompare(b, 'en', { caseFirst: 'upper' });
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