1 | ;
|
2 | /**
|
3 | * @hidden
|
4 | */
|
5 | Object.defineProperty(exports, "__esModule", { value: true });
|
6 | /**
|
7 | */
|
8 | //
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9 | // TransactionBuilder
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10 | // A utility for building and signing transactions
|
11 | //
|
12 | // Copyright 2014, BitGo, Inc. All Rights Reserved.
|
13 | //
|
14 | const bip32 = require("bip32");
|
15 | const Bluebird = require("bluebird");
|
16 | const utxolib = require("@bitgo/utxo-lib");
|
17 | const _ = require("lodash");
|
18 | const unspents_1 = require("@bitgo/unspents");
|
19 | const bitcoin_1 = require("./bitcoin");
|
20 | const debugLib = require("debug");
|
21 | const debug = debugLib('bitgo:v1:txb');
|
22 | const common = require("./common");
|
23 | const bip32path_1 = require("./bip32path");
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24 | //
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25 | // TransactionBuilder
|
26 | // @params:
|
27 | // wallet: a wallet object to send from
|
28 | // recipients: array of recipient objects and the amount to send to each e.g. [{address: '38BKDNZbPcLogvVbcx2ekJ9E6Vv94DqDqw', amount: 1500}, {address: '36eL8yQqCn1HMRmVFFo49t2PJ3pai8wQam', amount: 2000}]
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29 | // fee: the fee to use with this transaction. if not provided, a default, minimum fee will be used.
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30 | // feeRate: the amount of fee per kilobyte - optional - specify either fee, feeRate, or feeTxConfirmTarget but not more than one
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31 | // feeTxConfirmTarget: calculate the fees per kilobyte such that the transaction will be confirmed in this number of blocks
|
32 | // maxFeeRate: The maximum fee per kb to use in satoshis, for safety purposes when using dynamic fees
|
33 | // minConfirms: the minimum confirmations an output must have before spending
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34 | // forceChangeAtEnd: force the change address to be the last output
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35 | // changeAddress: specify the change address rather than generate a new one
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36 | // noSplitChange: set to true to disable automatic change splitting for purposes of unspent management
|
37 | // targetWalletUnspents: specify a number of target unspents to maintain in the wallet (currently defaulted to 8 by the server)
|
38 | // validate: extra verification of the change addresses, which is always done server-side and is redundant client-side (defaults true)
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39 | // minUnspentSize: The minimum size in satoshis of unspent to use (to prevent spending unspents worth less than fee added). Defaults to 0.
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40 | // feeSingleKeySourceAddress: Use this single key address to pay fees
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41 | // feeSingleKeyWIF: Use the address based on this private key to pay fees
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42 | // unspentsFetchParams: Extra parameters to use for fetching unspents for this transaction
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43 | exports.createTransaction = function (params) {
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44 | const minConfirms = params.minConfirms || 0;
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45 | const validate = params.validate === undefined ? true : params.validate;
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46 | let recipients = [];
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47 | let opReturns = [];
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48 | let extraChangeAmounts = [];
|
49 | let estTxSize;
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50 | let travelInfos;
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51 | // Sanity check the arguments passed in
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52 | if (!_.isObject(params.wallet) ||
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53 | (params.fee && !_.isNumber(params.fee)) ||
|
54 | (params.feeRate && !_.isNumber(params.feeRate)) ||
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55 | !_.isInteger(minConfirms) ||
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56 | (params.forceChangeAtEnd && !_.isBoolean(params.forceChangeAtEnd)) ||
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57 | (params.changeAddress && !_.isString(params.changeAddress)) ||
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58 | (params.noSplitChange && !_.isBoolean(params.noSplitChange)) ||
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59 | (params.targetWalletUnspents && !_.isInteger(params.targetWalletUnspents)) ||
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60 | (validate && !_.isBoolean(validate)) ||
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61 | (params.enforceMinConfirmsForChange && !_.isBoolean(params.enforceMinConfirmsForChange)) ||
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62 | (params.minUnspentSize && !_.isNumber(params.minUnspentSize)) ||
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63 | (params.maxFeeRate && !_.isNumber(params.maxFeeRate)) ||
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64 | // this should be an array and its length must be at least 1
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65 | (params.unspents && (!Array.isArray(params.unspents) || params.unspents.length < 1)) ||
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66 | (params.feeTxConfirmTarget && !_.isInteger(params.feeTxConfirmTarget)) ||
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67 | (params.instant && !_.isBoolean(params.instant)) ||
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68 | (params.bitgoFee && !_.isObject(params.bitgoFee)) ||
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69 | (params.unspentsFetchParams && !_.isObject(params.unspentsFetchParams))) {
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70 | throw new Error('invalid argument');
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71 | }
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72 | const bitgo = params.wallet.bitgo;
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73 | const constants = bitgo.getConstants();
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74 | const network = bitcoin_1.getNetwork(common.Environments[bitgo.getEnv()].network);
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75 | // The user can specify a seperate, single-key wallet for the purposes of paying miner's fees
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76 | // When creating a transaction this can be specified as an input address or the private key in WIF
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77 | let feeSingleKeySourceAddress;
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78 | let feeSingleKeyInputAmount = 0;
|
79 | if (params.feeSingleKeySourceAddress) {
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80 | try {
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81 | utxolib.address.fromBase58Check(params.feeSingleKeySourceAddress, network);
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82 | feeSingleKeySourceAddress = params.feeSingleKeySourceAddress;
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83 | }
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84 | catch (e) {
|
85 | throw new Error('invalid bitcoin address: ' + params.feeSingleKeySourceAddress);
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86 | }
|
87 | }
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88 | if (params.feeSingleKeyWIF) {
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89 | const feeSingleKey = utxolib.ECPair.fromWIF(params.feeSingleKeyWIF, network);
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90 | feeSingleKeySourceAddress = bitcoin_1.getAddressP2PKH(feeSingleKey);
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91 | // If the user specifies both, check to make sure the feeSingleKeySourceAddress corresponds to the address of feeSingleKeyWIF
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92 | if (params.feeSingleKeySourceAddress &&
|
93 | params.feeSingleKeySourceAddress !== feeSingleKeySourceAddress) {
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94 | throw new Error('feeSingleKeySourceAddress: ' + params.feeSingleKeySourceAddress +
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95 | ' did not correspond to address of feeSingleKeyWIF: ' + feeSingleKeySourceAddress);
|
96 | }
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97 | }
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98 | if (!_.isObject(params.recipients)) {
|
99 | throw new Error('recipients must be array of { address: abc, amount: 100000 } objects');
|
100 | }
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101 | let feeParamsDefined = 0;
|
102 | if (!_.isUndefined(params.fee)) {
|
103 | feeParamsDefined++;
|
104 | }
|
105 | if (!_.isUndefined(params.feeRate)) {
|
106 | feeParamsDefined++;
|
107 | }
|
108 | if (!_.isUndefined(params.feeTxConfirmTarget)) {
|
109 | feeParamsDefined++;
|
110 | }
|
111 | if (feeParamsDefined > 1) {
|
112 | throw new Error('cannot specify more than one of fee, feeRate and feeTxConfirmTarget');
|
113 | }
|
114 | if (_.isUndefined(params.maxFeeRate)) {
|
115 | params.maxFeeRate = constants.maxFeeRate;
|
116 | }
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117 | // Convert the old format of params.recipients (dictionary of address:amount) to new format: { destinationAddress, amount }
|
118 | if (!(params.recipients instanceof Array)) {
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119 | recipients = [];
|
120 | Object.keys(params.recipients).forEach(function (destinationAddress) {
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121 | const amount = params.recipients[destinationAddress];
|
122 | recipients.push({ address: destinationAddress, amount: amount });
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123 | });
|
124 | }
|
125 | else {
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126 | recipients = params.recipients;
|
127 | }
|
128 | if (params.opReturns) {
|
129 | if (!(params.opReturns instanceof Array)) {
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130 | opReturns = [];
|
131 | Object.keys(params.opReturns).forEach(function (message) {
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132 | const amount = params.opReturns[message];
|
133 | opReturns.push({ message, amount });
|
134 | });
|
135 | }
|
136 | else {
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137 | opReturns = params.opReturns;
|
138 | }
|
139 | }
|
140 | if (recipients.length === 0 && opReturns.length === 0) {
|
141 | throw new Error('must have at least one recipient');
|
142 | }
|
143 | let fee = params.fee;
|
144 | let feeRate = params.feeRate;
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145 | // Flag indicating whether this class will compute the fee
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146 | const shouldComputeBestFee = (_.isUndefined(fee));
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147 | let totalOutputAmount = 0;
|
148 | recipients.forEach(function (recipient) {
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149 | if (_.isString(recipient.address)) {
|
150 | try {
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151 | utxolib.address.fromBase58Check(recipient.address, network);
|
152 | }
|
153 | catch (e) {
|
154 | throw new Error('invalid bitcoin address: ' + recipient.address);
|
155 | }
|
156 | if (!!recipient.script) {
|
157 | // A script was provided as well - validate that the address corresponds to that
|
158 | if (utxolib.address.toOutputScript(recipient.address, network).toString('hex') !== recipient.script) {
|
159 | throw new Error('both script and address provided but they did not match: ' + recipient.address + ' ' + recipient.script);
|
160 | }
|
161 | }
|
162 | }
|
163 | if (!_.isInteger(recipient.amount) || recipient.amount < 0) {
|
164 | throw new Error('invalid amount for ' + recipient.address + ': ' + recipient.amount);
|
165 | }
|
166 | totalOutputAmount += recipient.amount;
|
167 | });
|
168 | opReturns.forEach(function (opReturn) {
|
169 | totalOutputAmount += opReturn.amount;
|
170 | });
|
171 | let bitgoFeeInfo = params.bitgoFee;
|
172 | if (bitgoFeeInfo &&
|
173 | (!_.isInteger(bitgoFeeInfo.amount) || !_.isString(bitgoFeeInfo.address))) {
|
174 | throw new Error('invalid bitgoFeeInfo');
|
175 | }
|
176 | // The total amount needed for this transaction.
|
177 | let totalAmount = totalOutputAmount + (fee || 0);
|
178 | // The list of unspent transactions being used in this transaction.
|
179 | let unspents;
|
180 | // the total number of unspents on this wallet
|
181 | let totalUnspentsCount;
|
182 | // the number of unspents we fetched from the server, before filtering
|
183 | let fetchedUnspentsCount;
|
184 | // The list of unspent transactions being used with zero-confirmations
|
185 | let zeroConfUnspentTxIds;
|
186 | // The sum of the input values for this transaction.
|
187 | let inputAmount;
|
188 | let changeOutputs = [];
|
189 | // The transaction.
|
190 | let transaction = utxolib.bitgo.createTransactionBuilderForNetwork(network);
|
191 | const getBitGoFee = function () {
|
192 | return Bluebird.try(function () {
|
193 | if (bitgoFeeInfo) {
|
194 | return;
|
195 | }
|
196 | return params.wallet.getBitGoFee({ amount: totalOutputAmount, instant: params.instant })
|
197 | .then(function (result) {
|
198 | if (result && result.fee > 0) {
|
199 | bitgoFeeInfo = {
|
200 | amount: result.fee,
|
201 | };
|
202 | }
|
203 | });
|
204 | })
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205 | .then(function () {
|
206 | if (bitgoFeeInfo && bitgoFeeInfo.amount > 0) {
|
207 | totalAmount += bitgoFeeInfo.amount;
|
208 | }
|
209 | });
|
210 | };
|
211 | const getBitGoFeeAddress = function () {
|
212 | return Bluebird.try(function () {
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213 | // If we don't have bitgoFeeInfo, or address is already set, don't get a new one
|
214 | if (!bitgoFeeInfo || bitgoFeeInfo.address) {
|
215 | return;
|
216 | }
|
217 | return bitgo.getBitGoFeeAddress()
|
218 | .then(function (result) {
|
219 | bitgoFeeInfo.address = result.address;
|
220 | });
|
221 | });
|
222 | };
|
223 | // Get a dynamic fee estimate from the BitGo server if feeTxConfirmTarget
|
224 | // is specified or if no fee-related params are specified
|
225 | const getDynamicFeeRateEstimate = function () {
|
226 | if (params.feeTxConfirmTarget || !feeParamsDefined) {
|
227 | return bitgo.estimateFee({
|
228 | numBlocks: params.feeTxConfirmTarget,
|
229 | maxFee: params.maxFeeRate,
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230 | inputs: zeroConfUnspentTxIds,
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231 | txSize: estTxSize,
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232 | cpfpAware: true,
|
233 | })
|
234 | .then(function (result) {
|
235 | const estimatedFeeRate = result.cpfpFeePerKb;
|
236 | const minimum = params.instant ? Math.max(constants.minFeeRate, constants.minInstantFeeRate) : constants.minFeeRate;
|
237 | // 5 satoshis per byte
|
238 | // it is worth noting that the padding only applies when the threshold is crossed, but not when the delta is less than the padding
|
239 | const padding = 5000;
|
240 | if (estimatedFeeRate < minimum) {
|
241 | console.log(new Date() + ': Error when estimating fee for send from ' + params.wallet.id() + ', it was too low - ' + estimatedFeeRate);
|
242 | feeRate = minimum + padding;
|
243 | }
|
244 | else if (estimatedFeeRate > params.maxFeeRate) {
|
245 | feeRate = params.maxFeeRate - padding;
|
246 | }
|
247 | else {
|
248 | feeRate = estimatedFeeRate;
|
249 | }
|
250 | return feeRate;
|
251 | })
|
252 | .catch(function (e) {
|
253 | // sanity check failed on tx size
|
254 | if (_.includes(e.message, 'invalid txSize')) {
|
255 | return Bluebird.reject(e);
|
256 | }
|
257 | else {
|
258 | // couldn't estimate the fee, proceed using the default
|
259 | feeRate = constants.fallbackFeeRate;
|
260 | console.log('Error estimating fee for send from ' + params.wallet.id() + ': ' + e.message);
|
261 | return Bluebird.resolve();
|
262 | }
|
263 | });
|
264 | }
|
265 | };
|
266 | // Get the unspents for the sending wallet.
|
267 | const getUnspents = function () {
|
268 | if (params.unspents) { // we just wanna use custom unspents
|
269 | unspents = params.unspents;
|
270 | return;
|
271 | }
|
272 | // Get enough unspents for the requested amount
|
273 | const options = _.merge({}, params.unspentsFetchParams || {}, {
|
274 | target: totalAmount,
|
275 | minSize: params.minUnspentSize || 0,
|
276 | instant: params.instant,
|
277 | targetWalletUnspents: params.targetWalletUnspents,
|
278 | });
|
279 | if (params.instant) {
|
280 | options.instant = params.instant; // insist on instant unspents only
|
281 | }
|
282 | return params.wallet.unspentsPaged(options)
|
283 | .then(function (results) {
|
284 | totalUnspentsCount = results.total;
|
285 | fetchedUnspentsCount = results.count;
|
286 | unspents = results.unspents.filter(function (u) {
|
287 | const confirms = u.confirmations || 0;
|
288 | if (!params.enforceMinConfirmsForChange && u.isChange) {
|
289 | return true;
|
290 | }
|
291 | return confirms >= minConfirms;
|
292 | });
|
293 | // abort early if there's no viable unspents, because it won't be possible to create the txn later
|
294 | if (unspents.length === 0) {
|
295 | throw Error('0 unspents available for transaction creation');
|
296 | }
|
297 | // create array of unconfirmed unspent ID strings of the form "txHash:outputIndex"
|
298 | zeroConfUnspentTxIds = _(results.unspents).filter(function (u) {
|
299 | return !u.confirmations;
|
300 | }).map(function (u) {
|
301 | return u.tx_hash + ':' + u.tx_output_n;
|
302 | }).value();
|
303 | if (_.isEmpty(zeroConfUnspentTxIds)) {
|
304 | // we don't want to pass an empty array of inputs to the server, because it assumes if the
|
305 | // inputs arguments exists, it contains values
|
306 | zeroConfUnspentTxIds = undefined;
|
307 | }
|
308 | // For backwards compatibility, respect the old splitChangeSize=0 parameter
|
309 | if (!params.noSplitChange && params.splitChangeSize !== 0) {
|
310 | extraChangeAmounts = results.extraChangeAmounts || [];
|
311 | }
|
312 | });
|
313 | };
|
314 | // Get the unspents for the single key fee address
|
315 | let feeSingleKeyUnspents = [];
|
316 | const getUnspentsForSingleKey = function () {
|
317 | if (feeSingleKeySourceAddress) {
|
318 | let feeTarget = 0.01e8;
|
319 | if (params.instant) {
|
320 | feeTarget += totalAmount * 0.001;
|
321 | }
|
322 | return bitgo.get(bitgo.url('/address/' + feeSingleKeySourceAddress + '/unspents?target=' + feeTarget))
|
323 | .then(function (response) {
|
324 | if (response.body.total <= 0) {
|
325 | throw new Error('No unspents available in single key fee source');
|
326 | }
|
327 | feeSingleKeyUnspents = response.body.unspents;
|
328 | });
|
329 | }
|
330 | };
|
331 | let minerFeeInfo = {};
|
332 | let txInfo = {};
|
333 | // Iterate unspents, sum the inputs, and save _inputs with the total
|
334 | // input amount and final list of inputs to use with the transaction.
|
335 | let feeSingleKeyUnspentsUsed = [];
|
336 | const collectInputs = function () {
|
337 | if (!unspents.length) {
|
338 | throw new Error('no unspents available on wallet');
|
339 | }
|
340 | inputAmount = 0;
|
341 | // Calculate the cost of spending a single input, i.e. the smallest economical unspent value
|
342 | return Bluebird.try(function () {
|
343 | if (_.isNumber(params.feeRate) || _.isNumber(params.originalFeeRate)) {
|
344 | return (!_.isUndefined(params.feeRate) ? params.feeRate : params.originalFeeRate);
|
345 | }
|
346 | else {
|
347 | return bitgo.estimateFee({
|
348 | numBlocks: params.feeTxConfirmTarget,
|
349 | maxFee: params.maxFeeRate,
|
350 | })
|
351 | .then(function (feeRateEstimate) {
|
352 | return feeRateEstimate.feePerKb;
|
353 | });
|
354 | }
|
355 | }).then(function (feeRate) {
|
356 | // Don't spend inputs that cannot pay for their own cost.
|
357 | let minInputValue = 0;
|
358 | if (_.isInteger(params.minUnspentSize)) {
|
359 | minInputValue = params.minUnspentSize;
|
360 | }
|
361 | let prunedUnspentCount = 0;
|
362 | const originalUnspentCount = unspents.length;
|
363 | unspents = _.filter(unspents, function (unspent) {
|
364 | const isSegwitInput = !!unspent.witnessScript;
|
365 | const currentInputSize = isSegwitInput ? unspents_1.VirtualSizes.txP2shP2wshInputSize : unspents_1.VirtualSizes.txP2shInputSize;
|
366 | const feeBasedMinInputValue = (feeRate * currentInputSize) / 1000;
|
367 | const currentMinInputValue = Math.max(minInputValue, feeBasedMinInputValue);
|
368 | if (currentMinInputValue > unspent.value) {
|
369 | // pruning unspent
|
370 | const pruneDetails = {
|
371 | generalMinInputValue: minInputValue,
|
372 | feeBasedMinInputValue,
|
373 | currentMinInputValue,
|
374 | feeRate,
|
375 | inputSize: currentInputSize,
|
376 | unspent: unspent,
|
377 | };
|
378 | console.log(`pruning unspent: ${JSON.stringify(pruneDetails, null, 4)}`);
|
379 | prunedUnspentCount++;
|
380 | return false;
|
381 | }
|
382 | return true;
|
383 | });
|
384 | if (prunedUnspentCount > 0) {
|
385 | console.log(`pruned ${prunedUnspentCount} out of ${originalUnspentCount} unspents`);
|
386 | }
|
387 | if (unspents.length === 0) {
|
388 | throw new Error('insufficient funds');
|
389 | }
|
390 | let segwitInputCount = 0;
|
391 | unspents.every(function (unspent) {
|
392 | if (unspent.witnessScript) {
|
393 | segwitInputCount++;
|
394 | }
|
395 | inputAmount += unspent.value;
|
396 | transaction.addInput(unspent.tx_hash, unspent.tx_output_n, 0xffffffff);
|
397 | return (inputAmount < (feeSingleKeySourceAddress ? totalOutputAmount : totalAmount));
|
398 | });
|
399 | // if paying fees from an external single key wallet, add the inputs
|
400 | if (feeSingleKeySourceAddress) {
|
401 | // collect the amount used in the fee inputs so we can get change later
|
402 | feeSingleKeyInputAmount = 0;
|
403 | feeSingleKeyUnspentsUsed = [];
|
404 | feeSingleKeyUnspents.every(function (unspent) {
|
405 | feeSingleKeyInputAmount += unspent.value;
|
406 | inputAmount += unspent.value;
|
407 | transaction.addInput(unspent.tx_hash, unspent.tx_output_n);
|
408 | feeSingleKeyUnspentsUsed.push(unspent);
|
409 | // use the fee wallet to pay miner fees and potentially instant fees
|
410 | return (feeSingleKeyInputAmount < (fee + (bitgoFeeInfo ? bitgoFeeInfo.amount : 0)));
|
411 | });
|
412 | }
|
413 | txInfo = {
|
414 | nP2shInputs: transaction.tx.ins.length - (feeSingleKeySourceAddress ? 1 : 0) - segwitInputCount,
|
415 | nP2shP2wshInputs: segwitInputCount,
|
416 | nP2pkhInputs: feeSingleKeySourceAddress ? 1 : 0,
|
417 | nOutputs: (recipients.length + 1 + // recipients and change
|
418 | extraChangeAmounts.length + // extra change splitting
|
419 | (bitgoFeeInfo && bitgoFeeInfo.amount > 0 ? 1 : 0) + // add output for bitgo fee
|
420 | (feeSingleKeySourceAddress ? 1 : 0) // add single key source address change
|
421 | ),
|
422 | };
|
423 | estTxSize = estimateTransactionSize({
|
424 | nP2shInputs: txInfo.nP2shInputs,
|
425 | nP2shP2wshInputs: txInfo.nP2shP2wshInputs,
|
426 | nP2pkhInputs: txInfo.nP2pkhInputs,
|
427 | nOutputs: txInfo.nOutputs,
|
428 | });
|
429 | }).then(getDynamicFeeRateEstimate)
|
430 | .then(function () {
|
431 | minerFeeInfo = exports.calculateMinerFeeInfo({
|
432 | bitgo: params.wallet.bitgo,
|
433 | feeRate: feeRate,
|
434 | nP2shInputs: txInfo.nP2shInputs,
|
435 | nP2shP2wshInputs: txInfo.nP2shP2wshInputs,
|
436 | nP2pkhInputs: txInfo.nP2pkhInputs,
|
437 | nOutputs: txInfo.nOutputs,
|
438 | });
|
439 | if (shouldComputeBestFee) {
|
440 | const approximateFee = minerFeeInfo.fee;
|
441 | const shouldRecurse = _.isUndefined(fee) || approximateFee > fee;
|
442 | fee = approximateFee;
|
443 | // Recompute totalAmount from scratch
|
444 | totalAmount = fee + totalOutputAmount;
|
445 | if (bitgoFeeInfo) {
|
446 | totalAmount += bitgoFeeInfo.amount;
|
447 | }
|
448 | if (shouldRecurse) {
|
449 | // if fee changed, re-collect inputs
|
450 | inputAmount = 0;
|
451 | transaction = utxolib.bitgo.createTransactionBuilderForNetwork(network);
|
452 | return collectInputs();
|
453 | }
|
454 | }
|
455 | const totalFee = fee + (bitgoFeeInfo ? bitgoFeeInfo.amount : 0);
|
456 | if (feeSingleKeySourceAddress) {
|
457 | const summedSingleKeyUnspents = _.sumBy(feeSingleKeyUnspents, 'value');
|
458 | if (totalFee > summedSingleKeyUnspents) {
|
459 | const err = new Error('Insufficient fee amount available in single key fee source: ' + summedSingleKeyUnspents);
|
460 | err.result = {
|
461 | fee: fee,
|
462 | feeRate: feeRate,
|
463 | estimatedSize: minerFeeInfo.size,
|
464 | available: inputAmount,
|
465 | bitgoFee: bitgoFeeInfo,
|
466 | txInfo: txInfo,
|
467 | };
|
468 | return Bluebird.reject(err);
|
469 | }
|
470 | }
|
471 | if (inputAmount < (feeSingleKeySourceAddress ? totalOutputAmount : totalAmount)) {
|
472 | // The unspents we're using for inputs do not have sufficient value on them to
|
473 | // satisfy the user's requested spend amount. That may be because the wallet's balance
|
474 | // is simply too low, or it might be that the wallet's balance is sufficient but
|
475 | // we didn't fetch enough unspents. Too few unspents could result from the wallet
|
476 | // having many small unspents and we hit our limit on the number of inputs we can use
|
477 | // in a txn, or it might have been that the filters the user passed in (like minConfirms)
|
478 | // disqualified too many of the unspents
|
479 | let err;
|
480 | if (totalUnspentsCount === fetchedUnspentsCount) {
|
481 | // we fetched every unspent the wallet had, but it still wasn't enough
|
482 | err = new Error('Insufficient funds');
|
483 | }
|
484 | else {
|
485 | // we weren't able to fetch all the unspents on the wallet
|
486 | err = new Error(`Transaction size too large due to too many unspents. Can send only ${inputAmount} satoshis in this transaction`);
|
487 | }
|
488 | err.result = {
|
489 | fee: fee,
|
490 | feeRate: feeRate,
|
491 | estimatedSize: minerFeeInfo.size,
|
492 | available: inputAmount,
|
493 | bitgoFee: bitgoFeeInfo,
|
494 | txInfo: txInfo,
|
495 | };
|
496 | return Bluebird.reject(err);
|
497 | }
|
498 | });
|
499 | };
|
500 | // Add the outputs for this transaction.
|
501 | const collectOutputs = function () {
|
502 | if (minerFeeInfo.size >= 90000) {
|
503 | throw new Error('transaction too large: estimated size ' + minerFeeInfo.size + ' bytes');
|
504 | }
|
505 | const outputs = [];
|
506 | recipients.forEach(function (recipient) {
|
507 | let script;
|
508 | if (_.isString(recipient.address)) {
|
509 | script = utxolib.address.toOutputScript(recipient.address, network);
|
510 | }
|
511 | else if (_.isObject(recipient.script)) {
|
512 | script = recipient.script;
|
513 | }
|
514 | else {
|
515 | throw new Error('neither recipient address nor script was provided');
|
516 | }
|
517 | // validate travelInfo if it exists
|
518 | let travelInfo;
|
519 | if (!_.isEmpty(recipient.travelInfo)) {
|
520 | travelInfo = recipient.travelInfo;
|
521 | // Better to avoid trouble now, before tx is created
|
522 | bitgo.travelRule().validateTravelInfo(travelInfo);
|
523 | }
|
524 | outputs.push({
|
525 | script: script,
|
526 | amount: recipient.amount,
|
527 | travelInfo: travelInfo,
|
528 | });
|
529 | });
|
530 | opReturns.forEach(function ({ message, amount }) {
|
531 | const script = utxolib.script.fromASM('OP_RETURN ' + Buffer.from(message).toString('hex'));
|
532 | outputs.push({ script, amount });
|
533 | });
|
534 | const getChangeOutputs = function (changeAmount) {
|
535 | if (changeAmount < 0) {
|
536 | throw new Error('negative change amount: ' + changeAmount);
|
537 | }
|
538 | const result = [];
|
539 | // if we paid fees from a single key wallet, return the fee change first
|
540 | if (feeSingleKeySourceAddress) {
|
541 | const feeSingleKeyWalletChangeAmount = feeSingleKeyInputAmount - (fee + (bitgoFeeInfo ? bitgoFeeInfo.amount : 0));
|
542 | if (feeSingleKeyWalletChangeAmount >= constants.minOutputSize) {
|
543 | result.push({ address: feeSingleKeySourceAddress, amount: feeSingleKeyWalletChangeAmount });
|
544 | changeAmount = changeAmount - feeSingleKeyWalletChangeAmount;
|
545 | }
|
546 | }
|
547 | if (changeAmount < constants.minOutputSize) {
|
548 | // Give it to the miners
|
549 | return result;
|
550 | }
|
551 | if (params.wallet.type() === 'safe') {
|
552 | return params.wallet.addresses()
|
553 | .then(function (response) {
|
554 | result.push({ address: response.addresses[0].address, amount: changeAmount });
|
555 | return result;
|
556 | });
|
557 | }
|
558 | let extraChangeTotal = _.sum(extraChangeAmounts);
|
559 | // Sanity check
|
560 | if (extraChangeTotal > changeAmount) {
|
561 | extraChangeAmounts = [];
|
562 | extraChangeTotal = 0;
|
563 | }
|
564 | // copy and add remaining change amount
|
565 | const allChangeAmounts = extraChangeAmounts.slice(0);
|
566 | allChangeAmounts.push(changeAmount - extraChangeTotal);
|
567 | // Recursive async func to add all change outputs
|
568 | const addChangeOutputs = function () {
|
569 | const thisAmount = allChangeAmounts.shift();
|
570 | if (!thisAmount) {
|
571 | return result;
|
572 | }
|
573 | return Bluebird.try(function () {
|
574 | if (params.changeAddress) {
|
575 | // If user passed a change address, use it for all outputs
|
576 | return params.changeAddress;
|
577 | }
|
578 | else {
|
579 | // Otherwise create a new address per output, for privacy
|
580 | // determine if segwit or not
|
581 | const changeChain = params.wallet.getChangeChain(params);
|
582 | return params.wallet.createAddress({ chain: changeChain, validate: validate })
|
583 | .then(function (result) {
|
584 | return result.address;
|
585 | });
|
586 | }
|
587 | })
|
588 | .then(function (address) {
|
589 | result.push({ address: address, amount: thisAmount });
|
590 | return addChangeOutputs();
|
591 | });
|
592 | };
|
593 | return addChangeOutputs();
|
594 | };
|
595 | // Add change output(s) and instant fee output if applicable
|
596 | return Bluebird.try(function () {
|
597 | return getChangeOutputs(inputAmount - totalAmount);
|
598 | })
|
599 | .then(function (result) {
|
600 | changeOutputs = result;
|
601 | const extraOutputs = changeOutputs.concat([]); // copy the array
|
602 | if (bitgoFeeInfo && bitgoFeeInfo.amount > 0) {
|
603 | extraOutputs.push(bitgoFeeInfo);
|
604 | }
|
605 | extraOutputs.forEach(function (output) {
|
606 | if (output.address) {
|
607 | output.script =
|
608 | utxolib.address.toOutputScript(output.address, network);
|
609 | }
|
610 | // decide where to put the outputs - default is to randomize unless forced to end
|
611 | const outputIndex = params.forceChangeAtEnd ? outputs.length : _.random(0, outputs.length);
|
612 | outputs.splice(outputIndex, 0, output);
|
613 | });
|
614 | // Add all outputs to the transaction
|
615 | outputs.forEach(function (output) {
|
616 | transaction.addOutput(output.script, output.amount);
|
617 | });
|
618 | travelInfos = _(outputs).map(function (output, index) {
|
619 | const result = output.travelInfo;
|
620 | if (!result) {
|
621 | return undefined;
|
622 | }
|
623 | result.outputIndex = index;
|
624 | return result;
|
625 | })
|
626 | .filter()
|
627 | .value();
|
628 | });
|
629 | };
|
630 | // Serialize the transaction, returning what is needed to sign it
|
631 | const serialize = function () {
|
632 | // only need to return the unspents that were used and just the chainPath, redeemScript, and instant flag
|
633 | const pickedUnspents = _.map(unspents, function (unspent) {
|
634 | return _.pick(unspent, ['chainPath', 'redeemScript', 'instant', 'witnessScript', 'script', 'value']);
|
635 | });
|
636 | const prunedUnspents = _.slice(pickedUnspents, 0, transaction.tx.ins.length - feeSingleKeyUnspentsUsed.length);
|
637 | _.each(feeSingleKeyUnspentsUsed, function (feeUnspent) {
|
638 | prunedUnspents.push({ redeemScript: false, chainPath: false }); // mark as false to signify a non-multisig address
|
639 | });
|
640 | const result = {
|
641 | transactionHex: transaction.buildIncomplete().toHex(),
|
642 | unspents: prunedUnspents,
|
643 | fee: fee,
|
644 | changeAddresses: changeOutputs.map(function (co) {
|
645 | return _.pick(co, ['address', 'path', 'amount']);
|
646 | }),
|
647 | walletId: params.wallet.id(),
|
648 | walletKeychains: params.wallet.keychains,
|
649 | feeRate: feeRate,
|
650 | instant: params.instant,
|
651 | bitgoFee: bitgoFeeInfo,
|
652 | estimatedSize: minerFeeInfo.size,
|
653 | txInfo: txInfo,
|
654 | travelInfos: travelInfos,
|
655 | };
|
656 | // Add for backwards compatibility
|
657 | if (result.instant && bitgoFeeInfo) {
|
658 | result.instantFee = _.pick(bitgoFeeInfo, ['amount', 'address']);
|
659 | }
|
660 | return result;
|
661 | };
|
662 | return Bluebird.try(function () {
|
663 | return getBitGoFee();
|
664 | })
|
665 | .then(function () {
|
666 | return Bluebird.all([getBitGoFeeAddress(), getUnspents(), getUnspentsForSingleKey()]);
|
667 | })
|
668 | .then(collectInputs)
|
669 | .then(collectOutputs)
|
670 | .then(serialize);
|
671 | };
|
672 | /**
|
673 | * Estimate the size of a transaction in bytes based on the number of
|
674 | * inputs and outputs present.
|
675 | * @params params {
|
676 | * nP2shInputs: number of P2SH (multisig) inputs
|
677 | * nP2pkhInputs: number of P2PKH (single sig) inputs
|
678 | * nOutputs: number of outputs
|
679 | * }
|
680 | *
|
681 | * @returns size: estimated size of the transaction in bytes
|
682 | */
|
683 | const estimateTransactionSize = function (params) {
|
684 | if (!_.isInteger(params.nP2shInputs) || params.nP2shInputs < 0) {
|
685 | throw new Error('expecting positive nP2shInputs');
|
686 | }
|
687 | if (!_.isInteger(params.nP2pkhInputs) || params.nP2pkhInputs < 0) {
|
688 | throw new Error('expecting positive nP2pkhInputs to be numeric');
|
689 | }
|
690 | if (!_.isInteger(params.nP2shP2wshInputs) || params.nP2shP2wshInputs < 0) {
|
691 | throw new Error('expecting positive nP2shP2wshInputs to be numeric');
|
692 | }
|
693 | if ((params.nP2shInputs + params.nP2shP2wshInputs) < 1) {
|
694 | throw new Error('expecting at least one nP2shInputs or nP2shP2wshInputs');
|
695 | }
|
696 | if (!_.isInteger(params.nOutputs) || params.nOutputs < 1) {
|
697 | throw new Error('expecting positive nOutputs');
|
698 | }
|
699 | const estimatedSize = unspents_1.VirtualSizes.txP2shInputSize * params.nP2shInputs +
|
700 | unspents_1.VirtualSizes.txP2shP2wshInputSize * (params.nP2shP2wshInputs || 0) +
|
701 | unspents_1.VirtualSizes.txP2pkhInputSizeUncompressedKey * (params.nP2pkhInputs || 0) +
|
702 | unspents_1.VirtualSizes.txP2pkhOutputSize * params.nOutputs +
|
703 | // if the tx contains at least one segwit input, the tx overhead is increased by 1
|
704 | unspents_1.VirtualSizes.txOverheadSize + (params.nP2shP2wshInputs > 0 ? 1 : 0);
|
705 | return estimatedSize;
|
706 | };
|
707 | /**
|
708 | * Calculate the fee and estimated size in bytes for a transaction.
|
709 | * @params params {
|
710 | * bitgo: bitgo object
|
711 | * feeRate: satoshis per kilobyte
|
712 | * nP2shInputs: number of P2SH (multisig) inputs
|
713 | * nP2pkhInputs: number of P2PKH (single sig) inputs
|
714 | * nOutputs: number of outputs
|
715 | * }
|
716 | *
|
717 | * @returns {
|
718 | * size: estimated size of the transaction in bytes
|
719 | * fee: estimated fee in satoshis for the transaction
|
720 | * feeRate: fee rate that was used to estimate the fee for the transaction
|
721 | * }
|
722 | */
|
723 | exports.calculateMinerFeeInfo = function (params) {
|
724 | const feeRateToUse = params.feeRate || params.bitgo.getConstants().fallbackFeeRate;
|
725 | const estimatedSize = estimateTransactionSize(params);
|
726 | return {
|
727 | size: estimatedSize,
|
728 | fee: Math.ceil(estimatedSize * feeRateToUse / 1000),
|
729 | feeRate: feeRateToUse,
|
730 | };
|
731 | };
|
732 | /*
|
733 | * Given a transaction hex, unspent information (chain path and redeem scripts), and the keychain xprv,
|
734 | * perform key derivation and sign the inputs in the transaction based on the unspent information provided
|
735 | *
|
736 | * @params:
|
737 | * transactionHex serialized form of the transaction in hex
|
738 | * unspents array of unspent information, where each unspent is a chainPath and redeemScript with the same
|
739 | * index as the inputs in the transactionHex
|
740 | * keychain Keychain containing the xprv to sign with. For legacy support of safe wallets, keychain can
|
741 | also be a WIF private key.
|
742 | * signingKey private key in WIF for safe wallets, when keychain is unavailable
|
743 | * validate client-side signature verification - can be disabled for improved performance (signatures
|
744 | * are still validated server-side).
|
745 | * feeSingleKeyWIF Use the address based on this private key to pay fees
|
746 | * @returns {*}
|
747 | */
|
748 | exports.signTransaction = function (params) {
|
749 | let keychain = params.keychain; // duplicate so as to not mutate below
|
750 | const validate = (params.validate === undefined) ? true : params.validate;
|
751 | let privKey;
|
752 | if (!_.isString(params.transactionHex)) {
|
753 | throw new Error('expecting the transaction hex as a string');
|
754 | }
|
755 | if (!Array.isArray(params.unspents)) {
|
756 | throw new Error('expecting the unspents array');
|
757 | }
|
758 | if (!_.isBoolean(validate)) {
|
759 | throw new Error('expecting validate to be a boolean');
|
760 | }
|
761 | let network = bitcoin_1.getNetwork();
|
762 | const enableBCH = (_.isBoolean(params.forceBCH) && params.forceBCH === true);
|
763 | if (!_.isObject(keychain) || !_.isString(keychain.xprv)) {
|
764 | if (_.isString(params.signingKey)) {
|
765 | privKey = utxolib.ECPair.fromWIF(params.signingKey, network);
|
766 | keychain = undefined;
|
767 | }
|
768 | else {
|
769 | throw new Error('expecting the keychain object with xprv');
|
770 | }
|
771 | }
|
772 | let feeSingleKey;
|
773 | if (params.feeSingleKeyWIF) {
|
774 | feeSingleKey = utxolib.ECPair.fromWIF(params.feeSingleKeyWIF, network);
|
775 | }
|
776 | debug('Network: %O', network);
|
777 | if (enableBCH) {
|
778 | debug('Enabling BCH…');
|
779 | network = utxolib.networks.bitcoincash;
|
780 | debug('New network: %O', network);
|
781 | }
|
782 | const transaction = utxolib.bitgo.createTransactionFromHex(params.transactionHex, network);
|
783 | if (transaction.ins.length !== params.unspents.length) {
|
784 | throw new Error('length of unspents array should equal to the number of transaction inputs');
|
785 | }
|
786 | // decorate transaction with input values for TransactionBuilder instantiation
|
787 | const isUtxoTx = _.isObject(transaction) && Array.isArray(transaction.ins);
|
788 | const areValidUnspents = _.isObject(params) && Array.isArray(params.unspents);
|
789 | if (isUtxoTx && areValidUnspents) {
|
790 | // extend the transaction inputs with the values
|
791 | const inputValues = _.map(params.unspents, (u => _.pick(u, 'value')));
|
792 | transaction.ins.map((currentItem, index) => _.extend(currentItem, inputValues[index]));
|
793 | }
|
794 | let rootExtKey;
|
795 | if (keychain) {
|
796 | rootExtKey = bip32.fromBase58(keychain.xprv);
|
797 | }
|
798 | const txb = utxolib.bitgo.createTransactionBuilderFromTransaction(transaction);
|
799 | for (let index = 0; index < txb.tx.ins.length; ++index) {
|
800 | const currentUnspent = params.unspents[index];
|
801 | if (currentUnspent.redeemScript === false) {
|
802 | // this is the input from a single key fee address
|
803 | if (!feeSingleKey) {
|
804 | throw new Error('single key address used in input but feeSingleKeyWIF not provided');
|
805 | }
|
806 | if (enableBCH) {
|
807 | feeSingleKey.network = network;
|
808 | }
|
809 | txb.sign(index, feeSingleKey);
|
810 | continue;
|
811 | }
|
812 | if (currentUnspent.witnessScript && enableBCH) {
|
813 | throw new Error('BCH does not support segwit inputs');
|
814 | }
|
815 | const chainPath = currentUnspent.chainPath;
|
816 | if (rootExtKey) {
|
817 | const { walletSubPath = '/0/0' } = keychain;
|
818 | const path = bip32path_1.sanitizeLegacyPath(keychain.path + walletSubPath + chainPath);
|
819 | privKey = rootExtKey.derivePath(path);
|
820 | }
|
821 | privKey.network = network;
|
822 | // subscript is the part of the output script after the OP_CODESEPARATOR.
|
823 | // Since we are only ever signing p2sh outputs, which do not have
|
824 | // OP_CODESEPARATORS, it is always the output script.
|
825 | const subscript = Buffer.from(currentUnspent.redeemScript, 'hex');
|
826 | currentUnspent.validationScript = subscript;
|
827 | // In order to sign with bitcoinjs-lib, we must use its transaction
|
828 | // builder, confusingly named the same exact thing as our transaction
|
829 | // builder, but with inequivalent behavior.
|
830 | try {
|
831 | const witnessScript = currentUnspent.witnessScript ? Buffer.from(currentUnspent.witnessScript, 'hex') : undefined;
|
832 | const sigHash = utxolib.bitgo.getDefaultSigHash(network);
|
833 | txb.sign(index, privKey, subscript, sigHash, currentUnspent.value, witnessScript);
|
834 | }
|
835 | catch (e) {
|
836 | // we need to know what's causing this
|
837 | e.result = {
|
838 | unspent: currentUnspent,
|
839 | };
|
840 | e.message = `Failed to sign input #${index} - ${e.message} - ${JSON.stringify(e.result, null, 4)} - \n${e.stack}`;
|
841 | debug('input sign failed: %s', e.message);
|
842 | return Bluebird.reject(e);
|
843 | }
|
844 | }
|
845 | const partialTransaction = txb.buildIncomplete();
|
846 | if (validate) {
|
847 | partialTransaction.ins.forEach((input, index) => {
|
848 | const signatureCount = utxolib.bitgo.getSignatureVerifications(partialTransaction, index, params.unspents[index].value).filter(v => v.signedBy !== undefined).length;
|
849 | if (signatureCount < 1) {
|
850 | throw new Error('expected at least one valid signature');
|
851 | }
|
852 | if (params.fullLocalSigning && signatureCount < 2) {
|
853 | throw new Error('fullLocalSigning set: expected at least two valid signatures');
|
854 | }
|
855 | });
|
856 | }
|
857 | return Bluebird.resolve({
|
858 | transactionHex: partialTransaction.toHex(),
|
859 | });
|
860 | };
|
861 | //# 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* @hidden\n */\n\n/**\n */\n//\n// TransactionBuilder\n// A utility for building and signing transactions\n//\n// Copyright 2014, BitGo, Inc.  All Rights Reserved.\n//\n\nimport * as bip32 from 'bip32';\nimport * as Bluebird from 'bluebird';\nimport * as utxolib from '@bitgo/utxo-lib';\nimport * as _ from 'lodash';\nimport { VirtualSizes } from '@bitgo/unspents';\nimport { getAddressP2PKH, getNetwork } from './bitcoin';\nimport debugLib = require('debug');\nconst debug = debugLib('bitgo:v1:txb');\nimport * as common from './common';\nimport { sanitizeLegacyPath } from './bip32path';\n\ninterface BaseOutput {\n  amount: number;\n  travelInfo?: any;\n}\n\ninterface AddressOutput extends BaseOutput {\n  address: string;\n}\n\ninterface ScriptOutput extends BaseOutput {\n  script: Buffer;\n}\n\ntype Output = AddressOutput | ScriptOutput;\n\ninterface BitGoUnspent {\n  value: number;\n  tx_hash: Buffer;\n  tx_output_n: number;\n}\n\n//\n// TransactionBuilder\n// @params:\n//   wallet:  a wallet object to send from\n//   recipients: array of recipient objects and the amount to send to each e.g. [{address: '38BKDNZbPcLogvVbcx2ekJ9E6Vv94DqDqw', amount: 1500}, {address: '36eL8yQqCn1HMRmVFFo49t2PJ3pai8wQam', amount: 2000}]\n//   fee: the fee to use with this transaction.  if not provided, a default, minimum fee will be used.\n//   feeRate: the amount of fee per kilobyte - optional - specify either fee, feeRate, or feeTxConfirmTarget but not more than one\n//   feeTxConfirmTarget: calculate the fees per kilobyte such that the transaction will be confirmed in this number of blocks\n//   maxFeeRate: The maximum fee per kb to use in satoshis, for safety purposes when using dynamic fees\n//   minConfirms: the minimum confirmations an output must have before spending\n//   forceChangeAtEnd: force the change address to be the last output\n//   changeAddress: specify the change address rather than generate a new one\n//   noSplitChange: set to true to disable automatic change splitting for purposes of unspent management\n//   targetWalletUnspents: specify a number of target unspents to maintain in the wallet (currently defaulted to 8 by the server)\n//   validate: extra verification of the change addresses, which is always done server-side and is redundant client-side (defaults true)\n//   minUnspentSize: The minimum size in satoshis of unspent to use (to prevent spending unspents worth less than fee added). Defaults to 0.\n//   feeSingleKeySourceAddress: Use this single key address to pay fees\n//   feeSingleKeyWIF: Use the address based on this private key to pay fees\n//   unspentsFetchParams: Extra parameters to use for fetching unspents for this transaction\nexports.createTransaction = function (params) {\n  const minConfirms = params.minConfirms || 0;\n  const validate = params.validate === undefined ? true : params.validate;\n  let recipients: { address: string; amount: number; script?: string; travelInfo?: any; }[] = [];\n  let opReturns: { message: string; amount: number; }[] = [];\n  let extraChangeAmounts: number[] = [];\n  let estTxSize: number;\n  let travelInfos;\n\n  // Sanity check the arguments passed in\n  if (!_.isObject(params.wallet) ||\n  (params.fee && !_.isNumber(params.fee)) ||\n  (params.feeRate && !_.isNumber(params.feeRate)) ||\n  !_.isInteger(minConfirms) ||\n  (params.forceChangeAtEnd && !_.isBoolean(params.forceChangeAtEnd)) ||\n  (params.changeAddress && !_.isString(params.changeAddress)) ||\n  (params.noSplitChange && !_.isBoolean(params.noSplitChange)) ||\n  (params.targetWalletUnspents && !_.isInteger(params.targetWalletUnspents)) ||\n  (validate && !_.isBoolean(validate)) ||\n  (params.enforceMinConfirmsForChange && !_.isBoolean(params.enforceMinConfirmsForChange)) ||\n  (params.minUnspentSize && !_.isNumber(params.minUnspentSize)) ||\n  (params.maxFeeRate && !_.isNumber(params.maxFeeRate)) ||\n  // this should be an array and its length must be at least 1\n  (params.unspents && (!Array.isArray(params.unspents) || params.unspents.length < 1)) ||\n  (params.feeTxConfirmTarget && !_.isInteger(params.feeTxConfirmTarget)) ||\n  (params.instant && !_.isBoolean(params.instant)) ||\n  (params.bitgoFee && !_.isObject(params.bitgoFee)) ||\n  (params.unspentsFetchParams && !_.isObject(params.unspentsFetchParams))\n  ) {\n    throw new Error('invalid argument');\n  }\n\n  const bitgo = params.wallet.bitgo;\n  const constants = bitgo.getConstants();\n  const network = getNetwork(common.Environments[bitgo.getEnv()].network);\n\n  // The user can specify a seperate, single-key wallet for the purposes of paying miner's fees\n  // When creating a transaction this can be specified as an input address or the private key in WIF\n  let feeSingleKeySourceAddress;\n  let feeSingleKeyInputAmount = 0;\n  if (params.feeSingleKeySourceAddress) {\n    try {\n      utxolib.address.fromBase58Check(params.feeSingleKeySourceAddress, network);\n      feeSingleKeySourceAddress = params.feeSingleKeySourceAddress;\n    } catch (e) {\n      throw new Error('invalid bitcoin address: ' + params.feeSingleKeySourceAddress);\n    }\n  }\n\n  if (params.feeSingleKeyWIF) {\n    const feeSingleKey = utxolib.ECPair.fromWIF(params.feeSingleKeyWIF, network as utxolib.BitcoinJSNetwork);\n    feeSingleKeySourceAddress = getAddressP2PKH(feeSingleKey);\n    // If the user specifies both, check to make sure the feeSingleKeySourceAddress corresponds 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of params.recipients (dictionary of address:amount) to new format: { destinationAddress, amount }\n  if (!(params.recipients instanceof Array)) {\n    recipients = [];\n    Object.keys(params.recipients).forEach(function (destinationAddress) {\n      const amount = params.recipients[destinationAddress];\n      recipients.push({ address: destinationAddress, amount: amount });\n    });\n  } else {\n    recipients = params.recipients;\n  }\n\n  if (params.opReturns) {\n    if (!(params.opReturns instanceof Array)) {\n      opReturns = [];\n      Object.keys(params.opReturns).forEach(function (message) {\n        const amount = params.opReturns[message];\n        opReturns.push({ message, amount });\n      });\n    } else {\n      opReturns = params.opReturns;\n    }\n  }\n\n  if (recipients.length === 0 && opReturns.length === 0) {\n    throw new Error('must have at least one recipient');\n  }\n\n  let fee = params.fee;\n  let feeRate = params.feeRate;\n\n  // Flag indicating whether this class will compute the fee\n  const shouldComputeBestFee = (_.isUndefined(fee));\n\n  let totalOutputAmount = 0;\n\n  recipients.forEach(function (recipient) {\n    if (_.isString(recipient.address)) {\n      try {\n        utxolib.address.fromBase58Check(recipient.address, network);\n      } catch (e) {\n        throw new Error('invalid bitcoin address: ' + recipient.address);\n      }\n      if (!!recipient.script) {\n        // A script was provided as well - validate that the address corresponds to that\n        if (utxolib.address.toOutputScript(recipient.address, network).toString('hex') !== recipient.script) {\n          throw new Error('both script and address provided but they did not match: ' + recipient.address + ' ' + recipient.script);\n        }\n      }\n    }\n    if (!_.isInteger(recipient.amount) || recipient.amount < 0) {\n      throw new Error('invalid amount for ' + recipient.address + ': ' + recipient.amount);\n    }\n    totalOutputAmount += recipient.amount;\n  });\n\n  opReturns.forEach(function (opReturn) {\n    totalOutputAmount += opReturn.amount;\n  });\n\n  let bitgoFeeInfo = params.bitgoFee;\n  if (bitgoFeeInfo &&\n  (!_.isInteger(bitgoFeeInfo.amount) || !_.isString(bitgoFeeInfo.address))) {\n    throw new Error('invalid bitgoFeeInfo');\n  }\n\n  // The total amount needed for this transaction.\n  let totalAmount = totalOutputAmount + (fee || 0);\n\n  // The list of unspent transactions being used in this transaction.\n  let unspents;\n\n  // the total number of unspents on this wallet\n  let totalUnspentsCount;\n\n  // the number of unspents we fetched from the server, before filtering\n  let fetchedUnspentsCount;\n\n  // The list of unspent transactions being used with zero-confirmations\n  let zeroConfUnspentTxIds;\n\n  // The sum of the input values for this transaction.\n  let inputAmount;\n\n  let changeOutputs: Output[] = [];\n\n  // The transaction.\n  let transaction = utxolib.bitgo.createTransactionBuilderForNetwork(network);\n\n  const getBitGoFee = function () {\n    return Bluebird.try(function () {\n      if (bitgoFeeInfo) {\n        return;\n      }\n      return params.wallet.getBitGoFee({ amount: totalOutputAmount, instant: params.instant })\n        .then(function (result) {\n          if (result && result.fee > 0) {\n            bitgoFeeInfo = {\n              amount: result.fee,\n            };\n          }\n        });\n    })\n      .then(function () {\n        if (bitgoFeeInfo && bitgoFeeInfo.amount > 0) {\n          totalAmount += bitgoFeeInfo.amount;\n        }\n      });\n  };\n\n  const getBitGoFeeAddress = function () {\n    return Bluebird.try(function () {\n      // If we don't have bitgoFeeInfo, or address is already set, don't get a new one\n      if (!bitgoFeeInfo || bitgoFeeInfo.address) {\n        return;\n      }\n      return bitgo.getBitGoFeeAddress()\n        .then(function (result) {\n          bitgoFeeInfo.address = result.address;\n        });\n    });\n  };\n\n  // Get a dynamic fee estimate from the BitGo server if feeTxConfirmTarget\n  // is specified or if no fee-related params are specified\n  const getDynamicFeeRateEstimate = function () {\n    if (params.feeTxConfirmTarget || !feeParamsDefined) {\n      return bitgo.estimateFee({\n        numBlocks: params.feeTxConfirmTarget,\n        maxFee: params.maxFeeRate,\n        inputs: zeroConfUnspentTxIds,\n        txSize: estTxSize,\n        cpfpAware: true,\n      })\n        .then(function (result) {\n          const estimatedFeeRate = result.cpfpFeePerKb;\n          const minimum = params.instant ? Math.max(constants.minFeeRate, constants.minInstantFeeRate) : constants.minFeeRate;\n          // 5 satoshis per byte\n          // it is worth noting that the padding only applies when the threshold is crossed, but not when the delta is less than the padding\n          const padding = 5000;\n          if (estimatedFeeRate < minimum) {\n            console.log(new Date() + ': Error when estimating fee for send from ' + params.wallet.id() + ', it was too low - ' + estimatedFeeRate);\n            feeRate = minimum + padding;\n          } else if (estimatedFeeRate > params.maxFeeRate) {\n            feeRate = params.maxFeeRate - padding;\n          } else {\n            feeRate = estimatedFeeRate;\n          }\n          return feeRate;\n        })\n        .catch(function (e) {\n        // sanity check failed on tx size\n          if (_.includes(e.message, 'invalid txSize')) {\n            return Bluebird.reject(e);\n          } else {\n          // couldn't estimate the fee, proceed using the default\n            feeRate = constants.fallbackFeeRate;\n            console.log('Error estimating fee for send from ' + params.wallet.id() + ': ' + e.message);\n            return Bluebird.resolve();\n          }\n        });\n    }\n  };\n\n\n  // Get the unspents for the sending wallet.\n  const getUnspents = function () {\n\n    if (params.unspents) { // we just wanna use custom unspents\n      unspents = params.unspents;\n      return;\n    }\n\n    // Get enough unspents for the requested amount\n    const options = _.merge({}, params.unspentsFetchParams || {}, {\n      target: totalAmount,\n      minSize: params.minUnspentSize || 0,\n      instant: params.instant, // insist on instant unspents only\n      targetWalletUnspents: params.targetWalletUnspents,\n    });\n    if (params.instant) {\n      options.instant = params.instant; // insist on instant unspents only\n    }\n\n    return params.wallet.unspentsPaged(options)\n      .then(function (results) {\n        totalUnspentsCount = results.total;\n        fetchedUnspentsCount = results.count;\n        unspents = results.unspents.filter(function (u) {\n          const confirms = u.confirmations || 0;\n          if (!params.enforceMinConfirmsForChange && u.isChange) {\n            return true;\n          }\n          return confirms >= minConfirms;\n        });\n\n        // abort early if there's no viable unspents, because it won't be possible to create the txn later\n        if (unspents.length === 0) {\n          throw Error('0 unspents available for transaction creation');\n        }\n\n        // create array of unconfirmed unspent ID strings of the form \"txHash:outputIndex\"\n        zeroConfUnspentTxIds = _(results.unspents).filter(function (u) {\n          return !u.confirmations;\n        }).map(function (u) {\n          return u.tx_hash + ':' + u.tx_output_n;\n        }).value();\n        if (_.isEmpty(zeroConfUnspentTxIds)) {\n        // we don't want to pass an empty array of inputs to the server, because it assumes if the\n        // inputs arguments exists, it contains values\n          zeroConfUnspentTxIds = undefined;\n        }\n\n        // For backwards compatibility, respect the old splitChangeSize=0 parameter\n        if (!params.noSplitChange && params.splitChangeSize !== 0) {\n          extraChangeAmounts = results.extraChangeAmounts || [];\n        }\n      });\n  };\n\n  // Get the unspents for the single key fee address\n  let feeSingleKeyUnspents: BitGoUnspent[] = [];\n  const getUnspentsForSingleKey = function () {\n    if (feeSingleKeySourceAddress) {\n      let feeTarget = 0.01e8;\n      if (params.instant) {\n        feeTarget += totalAmount * 0.001;\n      }\n      return bitgo.get(bitgo.url('/address/' + feeSingleKeySourceAddress + '/unspents?target=' + feeTarget))\n        .then(function (response) {\n          if (response.body.total <= 0) {\n            throw new Error('No unspents available in single key fee source');\n          }\n          feeSingleKeyUnspents = response.body.unspents;\n        });\n    }\n  };\n\n  let minerFeeInfo: any = {};\n  let txInfo: any = {};\n\n  // Iterate unspents, sum the inputs, and save _inputs with the total\n  // input amount and final list of inputs to use with the transaction.\n  let feeSingleKeyUnspentsUsed: BitGoUnspent[] = [];\n\n  const collectInputs = function () {\n    if (!unspents.length) {\n      throw new Error('no unspents available on wallet');\n    }\n    inputAmount = 0;\n\n    // Calculate the cost of spending a single input, i.e. the smallest economical unspent value\n    return Bluebird.try(function () {\n\n      if (_.isNumber(params.feeRate) || _.isNumber(params.originalFeeRate)) {\n        return (!_.isUndefined(params.feeRate) ? params.feeRate : params.originalFeeRate);\n      } else {\n        return bitgo.estimateFee({\n          numBlocks: params.feeTxConfirmTarget,\n          maxFee: params.maxFeeRate,\n        })\n          .then(function (feeRateEstimate) {\n            return feeRateEstimate.feePerKb;\n          });\n      }\n    }).then(function (feeRate) {\n      // Don't spend inputs that cannot pay for their own cost.\n      let minInputValue = 0;\n      if (_.isInteger(params.minUnspentSize)) {\n        minInputValue = params.minUnspentSize;\n      }\n\n      let prunedUnspentCount = 0;\n      const originalUnspentCount = unspents.length;\n      unspents = _.filter(unspents, function (unspent) {\n        const isSegwitInput = !!unspent.witnessScript;\n        const currentInputSize = isSegwitInput ? VirtualSizes.txP2shP2wshInputSize : VirtualSizes.txP2shInputSize;\n        const feeBasedMinInputValue = (feeRate * currentInputSize) / 1000;\n        const currentMinInputValue = Math.max(minInputValue, feeBasedMinInputValue);\n        if (currentMinInputValue > unspent.value) {\n          // pruning unspent\n          const pruneDetails = {\n            generalMinInputValue: minInputValue,\n            feeBasedMinInputValue,\n            currentMinInputValue,\n            feeRate,\n            inputSize: currentInputSize,\n            unspent: unspent,\n          };\n          console.log(`pruning unspent: ${JSON.stringify(pruneDetails, null, 4)}`);\n          prunedUnspentCount++;\n          return false;\n        }\n        return true;\n      });\n\n      if (prunedUnspentCount > 0) {\n        console.log(`pruned ${prunedUnspentCount} out of ${originalUnspentCount} unspents`);\n      }\n\n      if (unspents.length === 0) {\n        throw new Error('insufficient funds');\n      }\n      let segwitInputCount = 0;\n      unspents.every(function (unspent) {\n        if (unspent.witnessScript) {\n          segwitInputCount++;\n        }\n        inputAmount += unspent.value;\n        transaction.addInput(unspent.tx_hash, unspent.tx_output_n, 0xffffffff);\n\n        return (inputAmount < (feeSingleKeySourceAddress ? totalOutputAmount : totalAmount));\n      });\n\n      // if paying fees from an external single key wallet, add the inputs\n      if (feeSingleKeySourceAddress) {\n        // collect the amount used in the fee inputs so we can get change later\n        feeSingleKeyInputAmount = 0;\n        feeSingleKeyUnspentsUsed = [];\n        feeSingleKeyUnspents.every(function (unspent) {\n          feeSingleKeyInputAmount += unspent.value;\n          inputAmount += unspent.value;\n          transaction.addInput(unspent.tx_hash, unspent.tx_output_n);\n          feeSingleKeyUnspentsUsed.push(unspent);\n          // use the fee wallet to pay miner fees and potentially instant fees\n          return (feeSingleKeyInputAmount < (fee + (bitgoFeeInfo ? bitgoFeeInfo.amount : 0)));\n        });\n      }\n\n      txInfo = {\n        nP2shInputs: transaction.tx.ins.length - (feeSingleKeySourceAddress ? 1 : 0) - segwitInputCount,\n        nP2shP2wshInputs: segwitInputCount,\n        nP2pkhInputs: feeSingleKeySourceAddress ? 1 : 0,\n        nOutputs: (\n          recipients.length + 1 + // recipients and change\n        extraChangeAmounts.length + // extra change splitting\n        (bitgoFeeInfo && bitgoFeeInfo.amount > 0 ? 1 : 0) + // add output for bitgo fee\n        (feeSingleKeySourceAddress ? 1 : 0) // add single key source address change\n        ),\n      };\n\n      estTxSize = estimateTransactionSize({\n        nP2shInputs: txInfo.nP2shInputs,\n        nP2shP2wshInputs: txInfo.nP2shP2wshInputs,\n        nP2pkhInputs: txInfo.nP2pkhInputs,\n        nOutputs: txInfo.nOutputs,\n      });\n    }).then(getDynamicFeeRateEstimate)\n      .then(function () {\n        minerFeeInfo = exports.calculateMinerFeeInfo({\n          bitgo: params.wallet.bitgo,\n          feeRate: feeRate,\n          nP2shInputs: txInfo.nP2shInputs,\n          nP2shP2wshInputs: txInfo.nP2shP2wshInputs,\n          nP2pkhInputs: txInfo.nP2pkhInputs,\n          nOutputs: txInfo.nOutputs,\n        });\n\n        if (shouldComputeBestFee) {\n          const approximateFee = minerFeeInfo.fee;\n          const shouldRecurse = _.isUndefined(fee) || approximateFee > fee;\n          fee = approximateFee;\n          // Recompute totalAmount from scratch\n          totalAmount = fee + totalOutputAmount;\n          if (bitgoFeeInfo) {\n            totalAmount += bitgoFeeInfo.amount;\n          }\n          if (shouldRecurse) {\n          // if fee changed, re-collect inputs\n            inputAmount = 0;\n            transaction = utxolib.bitgo.createTransactionBuilderForNetwork(network);\n            return collectInputs();\n          }\n        }\n\n        const totalFee = fee + (bitgoFeeInfo ? bitgoFeeInfo.amount : 0);\n\n        if (feeSingleKeySourceAddress) {\n          const summedSingleKeyUnspents = _.sumBy(feeSingleKeyUnspents, 'value');\n          if (totalFee > summedSingleKeyUnspents) {\n            const err: any = new Error('Insufficient fee amount available in single key fee source: ' + summedSingleKeyUnspents);\n            err.result = {\n              fee: fee,\n              feeRate: feeRate,\n              estimatedSize: minerFeeInfo.size,\n              available: inputAmount,\n              bitgoFee: bitgoFeeInfo,\n              txInfo: txInfo,\n            };\n            return Bluebird.reject(err);\n          }\n        }\n\n        if (inputAmount < (feeSingleKeySourceAddress ? totalOutputAmount : totalAmount)) {\n        // The unspents we're using for inputs do not have sufficient value on them to\n        // satisfy the user's requested spend amount. That may be because the wallet's balance\n        // is simply too low, or it might be that the wallet's balance is sufficient but\n        // we didn't fetch enough unspents. Too few unspents could result from the wallet\n        // having many small unspents and we hit our limit on the number of inputs we can use\n        // in a txn, or it might have been that the filters the user passed in (like minConfirms)\n        // disqualified too many of the unspents\n          let err;\n          if (totalUnspentsCount === fetchedUnspentsCount) {\n          // we fetched every unspent the wallet had, but it still wasn't enough\n            err = new Error('Insufficient funds');\n          } else {\n          // we weren't able to fetch all the unspents on the wallet\n            err = new Error(`Transaction size too large due to too many unspents. Can send only ${inputAmount} satoshis in this transaction`);\n          }\n          err.result = {\n            fee: fee,\n            feeRate: feeRate,\n            estimatedSize: minerFeeInfo.size,\n            available: inputAmount,\n            bitgoFee: bitgoFeeInfo,\n            txInfo: txInfo,\n          };\n          return Bluebird.reject(err);\n        }\n      });\n  };\n\n  // Add the outputs for this transaction.\n  const collectOutputs = function () {\n    if (minerFeeInfo.size >= 90000) {\n      throw new Error('transaction too large: estimated size ' + minerFeeInfo.size + ' bytes');\n    }\n\n    const outputs: Output[] = [];\n\n    recipients.forEach(function (recipient) {\n      let script;\n      if (_.isString(recipient.address)) {\n        script = utxolib.address.toOutputScript(recipient.address, network);\n      } else if (_.isObject(recipient.script)) {\n        script = recipient.script;\n      } else {\n        throw new Error('neither recipient address nor script was provided');\n      }\n\n      // validate travelInfo if it exists\n      let travelInfo;\n      if (!_.isEmpty(recipient.travelInfo)) {\n        travelInfo = recipient.travelInfo;\n        // Better to avoid trouble now, before tx is created\n        bitgo.travelRule().validateTravelInfo(travelInfo);\n      }\n\n      outputs.push({\n        script: script,\n        amount: recipient.amount,\n        travelInfo: travelInfo,\n      });\n    });\n\n    opReturns.forEach(function ({ message, amount }) {\n      const script = utxolib.script.fromASM('OP_RETURN ' + Buffer.from(message).toString('hex'));\n      outputs.push({ script, amount });\n    });\n\n    const getChangeOutputs = function (changeAmount: number): Output[] | Bluebird<Output[]> {\n      if (changeAmount < 0) {\n        throw new Error('negative change amount: ' + changeAmount);\n      }\n\n      const result: Output[] = [];\n      // if we paid fees from a single key wallet, return the fee change first\n      if (feeSingleKeySourceAddress) {\n        const feeSingleKeyWalletChangeAmount = feeSingleKeyInputAmount - (fee + (bitgoFeeInfo ? bitgoFeeInfo.amount : 0));\n        if (feeSingleKeyWalletChangeAmount >= constants.minOutputSize) {\n          result.push({ address: feeSingleKeySourceAddress, amount: feeSingleKeyWalletChangeAmount });\n          changeAmount = changeAmount - feeSingleKeyWalletChangeAmount;\n        }\n      }\n\n      if (changeAmount < constants.minOutputSize) {\n        // Give it to the miners\n        return result;\n      }\n\n      if (params.wallet.type() === 'safe') {\n        return params.wallet.addresses()\n          .then(function (response) {\n            result.push({ address: response.addresses[0].address, amount: changeAmount });\n            return result;\n          });\n      }\n\n      let extraChangeTotal = _.sum(extraChangeAmounts);\n      // Sanity check\n      if (extraChangeTotal > changeAmount) {\n        extraChangeAmounts = [];\n        extraChangeTotal = 0;\n      }\n\n      // copy and add remaining change amount\n      const allChangeAmounts = extraChangeAmounts.slice(0);\n      allChangeAmounts.push(changeAmount - extraChangeTotal);\n\n      // Recursive async func to add all change outputs\n      const addChangeOutputs = function (): Output[] | Bluebird<Output[]> {\n        const thisAmount = allChangeAmounts.shift();\n        if (!thisAmount) {\n          return result;\n        }\n        return Bluebird.try(function () {\n          if (params.changeAddress) {\n            // If user passed a change address, use it for all outputs\n            return params.changeAddress;\n          } else {\n            // Otherwise create a new address per output, for privacy\n            // determine if segwit or not\n            const changeChain = params.wallet.getChangeChain(params);\n            return params.wallet.createAddress({ chain: changeChain, validate: validate })\n              .then(function (result) {\n                return result.address;\n              });\n          }\n        })\n          .then(function (address) {\n            result.push({ address: address, amount: thisAmount });\n            return addChangeOutputs();\n          });\n      };\n\n      return addChangeOutputs();\n    };\n\n    // Add change output(s) and instant fee output if applicable\n    return Bluebird.try(function () {\n      return getChangeOutputs(inputAmount - totalAmount);\n    })\n      .then(function (result) {\n        changeOutputs = result;\n        const extraOutputs = changeOutputs.concat([]); // copy the array\n        if (bitgoFeeInfo && bitgoFeeInfo.amount > 0) {\n          extraOutputs.push(bitgoFeeInfo);\n        }\n        extraOutputs.forEach(function (output) {\n          if ((output as AddressOutput).address) {\n            (output as ScriptOutput).script =\n            utxolib.address.toOutputScript((output as AddressOutput).address, network);\n          }\n\n          // decide where to put the outputs - default is to randomize unless forced to end\n          const outputIndex = params.forceChangeAtEnd ? outputs.length : _.random(0, outputs.length);\n          outputs.splice(outputIndex, 0, output);\n        });\n\n        // Add all outputs to the transaction\n        outputs.forEach(function (output) {\n          transaction.addOutput((output as ScriptOutput).script, output.amount);\n        });\n\n        travelInfos = _(outputs).map(function (output, index) {\n          const result = output.travelInfo;\n          if (!result) {\n            return undefined;\n          }\n          result.outputIndex = index;\n          return result;\n        })\n          .filter()\n          .value();\n      });\n  };\n\n  // Serialize the transaction, returning what is needed to sign it\n  const serialize = function () {\n    // only need to return the unspents that were used and just the chainPath, redeemScript, and instant flag\n    const pickedUnspents: any = _.map(unspents, function (unspent) {\n      return _.pick(unspent, ['chainPath', 'redeemScript', 'instant', 'witnessScript', 'script', 'value']);\n    });\n    const prunedUnspents = _.slice(pickedUnspents, 0, transaction.tx.ins.length - feeSingleKeyUnspentsUsed.length);\n    _.each(feeSingleKeyUnspentsUsed, function (feeUnspent) {\n      prunedUnspents.push({ redeemScript: false, chainPath: false }); // mark as false to signify a non-multisig address\n    });\n    const result: any = {\n      transactionHex: transaction.buildIncomplete().toHex(),\n      unspents: prunedUnspents,\n      fee: fee,\n      changeAddresses: changeOutputs.map(function (co) {\n        return _.pick(co, ['address', 'path', 'amount']);\n      }),\n      walletId: params.wallet.id(),\n      walletKeychains: params.wallet.keychains,\n      feeRate: feeRate,\n      instant: params.instant,\n      bitgoFee: bitgoFeeInfo,\n      estimatedSize: minerFeeInfo.size,\n      txInfo: txInfo,\n      travelInfos: travelInfos,\n    };\n\n    // Add for backwards compatibility\n    if (result.instant && bitgoFeeInfo) {\n      result.instantFee = _.pick(bitgoFeeInfo, ['amount', 'address']);\n    }\n\n    return result;\n  };\n\n  return Bluebird.try(function () {\n    return getBitGoFee();\n  })\n    .then(function () {\n      return Bluebird.all([getBitGoFeeAddress(), getUnspents(), getUnspentsForSingleKey()]);\n    })\n    .then(collectInputs)\n    .then(collectOutputs)\n    .then(serialize);\n};\n\n\n/**\n * Estimate the size of a transaction in bytes based on the number of\n * inputs and outputs present.\n * @params params {\n *   nP2shInputs: number of P2SH (multisig) inputs\n *   nP2pkhInputs: number of P2PKH (single sig) inputs\n *   nOutputs: number of outputs\n * }\n *\n * @returns size: estimated size of the transaction in bytes\n */\nconst estimateTransactionSize = function (params) {\n  if (!_.isInteger(params.nP2shInputs) || params.nP2shInputs < 0) {\n    throw new Error('expecting positive nP2shInputs');\n  }\n  if (!_.isInteger(params.nP2pkhInputs) || params.nP2pkhInputs < 0) {\n    throw new Error('expecting positive nP2pkhInputs to be numeric');\n  }\n  if (!_.isInteger(params.nP2shP2wshInputs) || params.nP2shP2wshInputs < 0) {\n    throw new Error('expecting positive nP2shP2wshInputs to be numeric');\n  }\n  if ((params.nP2shInputs + params.nP2shP2wshInputs) < 1) {\n    throw new Error('expecting at least one nP2shInputs or nP2shP2wshInputs');\n  }\n  if (!_.isInteger(params.nOutputs) || params.nOutputs < 1) {\n    throw new Error('expecting positive nOutputs');\n  }\n\n\n  const estimatedSize = VirtualSizes.txP2shInputSize * params.nP2shInputs +\n  VirtualSizes.txP2shP2wshInputSize * (params.nP2shP2wshInputs || 0) +\n  VirtualSizes.txP2pkhInputSizeUncompressedKey * (params.nP2pkhInputs || 0) +\n  VirtualSizes.txP2pkhOutputSize * params.nOutputs +\n  // if the tx contains at least one segwit input, the tx overhead is increased by 1\n  VirtualSizes.txOverheadSize + (params.nP2shP2wshInputs > 0 ? 1 : 0);\n\n  return estimatedSize;\n};\n\n\n/**\n * Calculate the fee and estimated size in bytes for a transaction.\n * @params params {\n *   bitgo: bitgo object\n *   feeRate: satoshis per kilobyte\n *   nP2shInputs: number of P2SH (multisig) inputs\n *   nP2pkhInputs: number of P2PKH (single sig) inputs\n *   nOutputs: number of outputs\n * }\n *\n * @returns {\n *   size: estimated size of the transaction in bytes\n *   fee: estimated fee in satoshis for the transaction\n *   feeRate: fee rate that was used to estimate the fee for the transaction\n * }\n */\nexports.calculateMinerFeeInfo = function (params) {\n  const feeRateToUse = params.feeRate || params.bitgo.getConstants().fallbackFeeRate;\n  const estimatedSize = estimateTransactionSize(params);\n\n  return {\n    size: estimatedSize,\n    fee: Math.ceil(estimatedSize * feeRateToUse / 1000),\n    feeRate: feeRateToUse,\n  };\n};\n\n/*\n * Given a transaction hex, unspent information (chain path and redeem scripts), and the keychain xprv,\n * perform key derivation and sign the inputs in the transaction based on the unspent information provided\n *\n * @params:\n *  transactionHex serialized form of the transaction in hex\n *  unspents array of unspent information, where each unspent is a chainPath and redeemScript with the same\n *  index as the inputs in the transactionHex\n *  keychain Keychain containing the xprv to sign with. For legacy support of safe wallets, keychain can\n also be a WIF private key.\n *  signingKey private key in WIF for safe wallets, when keychain is unavailable\n *  validate client-side signature verification - can be disabled for improved performance (signatures\n *           are still validated server-side).\n *  feeSingleKeyWIF Use the address based on this private key to pay fees\n * @returns {*}\n */\nexports.signTransaction = function (params) {\n  let keychain = params.keychain; // duplicate so as to not mutate below\n\n  const validate = (params.validate === undefined) ? true : params.validate;\n  let privKey;\n  if (!_.isString(params.transactionHex)) {\n    throw new Error('expecting the transaction hex as a string');\n  }\n  if (!Array.isArray(params.unspents)) {\n    throw new Error('expecting the unspents array');\n  }\n  if (!_.isBoolean(validate)) {\n    throw new Error('expecting validate to be a boolean');\n  }\n  let network = getNetwork();\n  const enableBCH = (_.isBoolean(params.forceBCH) && params.forceBCH === true);\n\n  if (!_.isObject(keychain) || !_.isString((keychain as any).xprv)) {\n    if (_.isString(params.signingKey)) {\n      privKey = utxolib.ECPair.fromWIF(params.signingKey, network as utxolib.BitcoinJSNetwork);\n      keychain = undefined;\n    } else {\n      throw new Error('expecting the keychain object with xprv');\n    }\n  }\n\n  let feeSingleKey;\n  if (params.feeSingleKeyWIF) {\n    feeSingleKey = utxolib.ECPair.fromWIF(params.feeSingleKeyWIF, network as utxolib.BitcoinJSNetwork);\n  }\n\n  debug('Network: %O', network);\n\n  if (enableBCH) {\n    debug('Enabling BCH…');\n    network = utxolib.networks.bitcoincash;\n    debug('New network: %O', network);\n  }\n\n  const transaction = utxolib.bitgo.createTransactionFromHex(params.transactionHex, network);\n  if (transaction.ins.length !== params.unspents.length) {\n    throw new Error('length of unspents array should equal to the number of transaction inputs');\n  }\n\n  // decorate transaction with input values for TransactionBuilder instantiation\n  const isUtxoTx = _.isObject(transaction) && Array.isArray((transaction as any).ins);\n  const areValidUnspents = _.isObject(params) && Array.isArray((params as any).unspents);\n  if (isUtxoTx && areValidUnspents) {\n    // extend the transaction inputs with the values\n    const inputValues = _.map((params as any).unspents, (u => _.pick(u, 'value')));\n    transaction.ins.map((currentItem, index) => _.extend(currentItem, inputValues[index]));\n  }\n\n  let rootExtKey;\n  if (keychain) {\n    rootExtKey = bip32.fromBase58(keychain.xprv);\n  }\n\n  const txb = utxolib.bitgo.createTransactionBuilderFromTransaction(transaction);\n\n  for (let index = 0; index < txb.tx.ins.length; ++index) {\n    const currentUnspent = params.unspents[index];\n    if (currentUnspent.redeemScript === false) {\n      // this is the input from a single key fee address\n      if (!feeSingleKey) {\n        throw new Error('single key address used in input but feeSingleKeyWIF not provided');\n      }\n\n      if (enableBCH) {\n        feeSingleKey.network = network;\n      }\n\n      txb.sign(index, feeSingleKey);\n      continue;\n    }\n\n    if (currentUnspent.witnessScript && enableBCH) {\n      throw new Error('BCH does not support segwit inputs');\n    }\n\n    const chainPath = currentUnspent.chainPath;\n    if (rootExtKey) {\n      const { walletSubPath = '/0/0' } = keychain;\n      const path = sanitizeLegacyPath(keychain.path + walletSubPath + chainPath);\n      privKey = rootExtKey.derivePath(path);\n    }\n\n    privKey.network = network;\n\n    // subscript is the part of the output script after the OP_CODESEPARATOR.\n    // Since we are only ever signing p2sh outputs, which do not have\n    // OP_CODESEPARATORS, it is always the output script.\n    const subscript = Buffer.from(currentUnspent.redeemScript, 'hex');\n    currentUnspent.validationScript = subscript;\n\n    // In order to sign with bitcoinjs-lib, we must use its transaction\n    // builder, confusingly named the same exact thing as our transaction\n    // builder, but with inequivalent behavior.\n    try {\n      const witnessScript = currentUnspent.witnessScript ? Buffer.from(currentUnspent.witnessScript, 'hex') : undefined;\n      const sigHash = utxolib.bitgo.getDefaultSigHash(network);\n      txb.sign(index, privKey, subscript, sigHash, currentUnspent.value, witnessScript);\n    } catch (e) {\n      // we need to know what's causing this\n      e.result = {\n        unspent: currentUnspent,\n      };\n      e.message = `Failed to sign input #${index} - ${e.message} - ${JSON.stringify(e.result, null, 4)} - \\n${e.stack}`;\n      debug('input sign failed: %s', e.message);\n      return Bluebird.reject(e);\n    }\n  }\n\n  const partialTransaction = txb.buildIncomplete();\n\n  if (validate) {\n    partialTransaction.ins.forEach((input, index) => {\n      const signatureCount = utxolib.bitgo.getSignatureVerifications(\n        partialTransaction, index, params.unspents[index].value\n      ).filter(v => v.signedBy !== undefined).length;\n      if (signatureCount < 1) {\n        throw new Error('expected at least one valid signature');\n      }\n      if (params.fullLocalSigning && signatureCount < 2) {\n        throw new Error('fullLocalSigning set: expected at least two valid signatures');\n      }\n    });\n  }\n\n  return Bluebird.resolve({\n    transactionHex: partialTransaction.toHex(),\n  });\n};\n"]} |
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