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dashtx.js
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dashtx.js
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/**
* @typedef Tx
* @prop {Uint53} SATOSHIS
* @prop {Uint32} _HEADER_ONLY_SIZE
* @prop {Uint32} HEADER_SIZE
* @prop {Uint32} LEGACY_DUST
* @prop {Uint32} MIN_INPUT_SIZE - 147 each
* @prop {Uint32} MAX_INPUT_PAD - 2 (possible ASN.1 BigInt padding)
* @prop {Uint32} MAX_INPUT_SIZE - 149 each (with padding)
* @prop {Uint32} OUTPUT_SIZE - 34 each
* @prop {Uint32|0x00000001} SIGHASH_ALL - 0x01
* @prop {Uint32|0x00000002} SIGHASH_NONE - 0x02
* @prop {Uint32|0x00000003} SIGHASH_SINGLE - 0x03 - Not Supported
* @prop {Uint32|0x00000080} SIGHASH_ANYONECANPAY - 0x80
* @prop {Uint32|0x00000081} SIGHASH_DEFAULT - 0x81
* @prop {TxAppraise} appraise
* @prop {TxAppraiseCounts} _appraiseCounts
* @prop {TxAppraiseMemos} _appraiseMemos
* @prop {TxToDash} toDash
* @prop {TxToSats} toSats
* @prop {TxCreate} create
* @prop {TxCreateDonationOutput} createDonationOutput
* @prop {TxCreateRaw} createRaw
* @prop {TxCreateInputRaw} createInputRaw
* @prop {TxCreateForSig} createForSig
* @prop {TxCreateInputForSig} createInputForSig
* @prop {TxCreatePkhScript} createPkhScript
* @prop {TxCreateSigned} createSigned
* @prop {TxGetId} getId - only useful for fully signed tx
* @prop {TxCreateLegacyTx} createLegacyTx
* @prop {TxDoubleSha256} doubleSha256
* @prop {TxParseUnknown} parseUnknown
* @prop {TxParseRequest} parseRequest
* @prop {TxParseSigHash} parseSigHash
* @prop {TxParseSigned} parseSigned
* @prop {TxSelectSigHashInputs} selectSigHashInputs
* @prop {TxSelectSigHashOutputs} selectSigHashOutputs
* @prop {TxSerialize} serialize
* @prop {TxSerializeForSig} serializeForSig
* @prop {TxSerializeInputs} serializeInputs
* @prop {TxSerializeInput} serializeInput
* @prop {TxSerializeOutputs} serializeOutputs
* @prop {TxSerializeOutput} serializeOutput
* @prop {TxSortBySats} sortBySatsAsc
* @prop {TxSortBySats} sortBySatsDsc
* @prop {TxSortInputs} sortInputs
* @prop {TxSortOutputs} sortOutputs
* @prop {TxSum} sum - sums an array of TxInputUnspent
* @prop {TxUtils} utils
* @prop {Function} _createInsufficientFundsError
* @prop {Function} _createMemoScript
* @prop {Function} _debugPrint
* @prop {Function} _legacyMustSelectInputs
* @prop {Function} _legacySelectOptimalUtxos
* @prop {Function} _parse
*/
/**
* @typedef TxUtils
* @prop {TxRPC} rpc
* @prop {TxToVarInt} toVarInt
* @prop {TxToVarIntSize} toVarIntSize
* @prop {TxReverseHex} reverseHex
* @prop {TxHexToBytes} hexToBytes
* @prop {TxBytesToHex} bytesToHex
* @prop {TxStringToHex} strToHex
* @prop {TxToUint32LE} toUint32LE
* @prop {TxToUint64LE} toUint64LE
*/
/**
* @callback TxCreate
* @param {TxKeyUtils} keyUtils
* @returns {tx}
*/
/**
* @typedef tx
* @prop {TxHashAndSignAll} hashAndSignAll
* @prop {TxHashAndSignInput} hashAndSignInput
*/
/** @type {Tx} */
//@ts-ignore
var DashTx = ("object" === typeof module && exports) || {};
(function (window, Tx) {
"use strict";
//@ts-ignore
let Crypto = globalThis.crypto;
let TxUtils = {};
const CURRENT_VERSION = 3;
const TYPE_VERSION = 0;
const SATOSHIS = 100000000;
const MAX_U8 = Math.pow(2, 8) - 1;
const MAX_U16 = Math.pow(2, 16) - 1;
const MAX_U32 = Math.pow(2, 32) - 1;
const MAX_U53 = Number.MAX_SAFE_INTEGER; // Math.pow(2, 53) - 1
const MAX_U64 = 2n ** 64n - 1n;
const CH_0 = 48;
const CH_9 = 57;
const CH_A = 97;
const CH_F = 102;
const OP_RETURN = "6a"; // 106
// Satoshis (64-bit) + lockscript size + OP_RETURN + Message Len
const OP_RETURN_HEADER_SIZE = 8 + 1 + 1 + 1;
const OP_PUSHDATA1 = "4c";
const OP_PUSHDATA1_INT = 0x4c; // 76
const OP_PUSHDATA2 = "4d";
const OP_DUP = "76";
const OP_HASH160 = "a9";
const OP_EQUALVERIFY = "88";
const OP_CHECKSIG = "ac";
const PKH_SIZE = (20).toString(16); // 0x14
const PKH_SCRIPT_SIZE = (25).toString(16); // 0x19
//@ts-ignore - for debug only
Tx._OP_DUP_HEX = OP_DUP;
//@ts-ignore - for debug only
Tx._OP_HASH160_HEX = OP_HASH160;
//@ts-ignore - for debug only
Tx._OP_EQUALVERIFY_HEX = OP_EQUALVERIFY;
//@ts-ignore - for debug only
Tx._OP_CHECKSIG_HEX = OP_CHECKSIG;
//@ts-ignore - for debug only
Tx._OP_RETURN_HEX = OP_RETURN;
//@ts-ignore - for debug only
Tx._PKH_SIZE_HEX = PKH_SIZE;
//@ts-ignore - for debug only
Tx._PKH_SCRIPT_SIZE_HEX = PKH_SCRIPT_SIZE;
const E_KEYBYTES_UNDEFINED = `developer error: keyUtils.getPrivateKey() must return 'keyBytes' to sign, or 'null' to skip`;
const E_LITTLE_INT =
"JavaScript 'Number's only go up to uint53, you must use 'BigInt' (ex: `let amount = 18014398509481984n`) for larger values";
const E_TOO_BIG_INT =
"JavaScript 'BigInt's are arbitrarily large, but you may only use up to UINT64 for transactions";
const E_NO_OUTPUTS = `'outputs' list must not be empty; use .createDonationOutput({ message }) to burn inputs`;
Tx.SATOSHIS = SATOSHIS;
Tx.LEGACY_DUST = 2000;
Tx._HEADER_ONLY_SIZE =
2 + // version
2 + // type
4; // locktime
Tx.HEADER_SIZE =
2 + // version
2 + // type
1 + // input count
1 + // output count
4; // locktime
Tx.MIN_INPUT_SIZE = // 147~149 each
4 + // outputIndex
32 + // txId
1 + // sigscriptsize
106 + // sigscript
4; // sequence
Tx.MAX_INPUT_PAD = // possible ASN.1 BigInt padding
1 + // Signature R value
1 + // Signature S value
0; // Public Key value is NOT BigInt padded
Tx.MAX_INPUT_SIZE = Tx.MIN_INPUT_SIZE + Tx.MAX_INPUT_PAD;
Tx.OUTPUT_SIZE = // 34 each
8 + // satoshis (base units) value
1 + // lockscript size
25; // lockscript
Tx.SIGHASH_ALL = 0x01;
Tx.SIGHASH_NONE = 0x02;
Tx.SIGHASH_SINGLE = 0x03; // Not Supported
Tx.SIGHASH_ANYONECANPAY = 0x80;
Tx.SIGHASH_DEFAULT = Tx.SIGHASH_ALL | Tx.SIGHASH_ANYONECANPAY;
Tx.appraise = function (txInfo) {
let extraSize = Tx._appraiseMemos(txInfo.outputs);
let fees = Tx._appraiseCounts(
txInfo.inputs.length,
txInfo.outputs.length,
extraSize,
);
return fees;
};
Tx._appraiseCounts = function (numInputs, numOutputs, extraSize) {
let min = Tx._HEADER_ONLY_SIZE;
min += Tx.utils.toVarIntSize(numInputs);
min += Tx.MIN_INPUT_SIZE * numInputs;
min += Tx.utils.toVarIntSize(numOutputs);
if (extraSize) {
min += extraSize; // memos, etc
}
let maxPadding = Tx.MAX_INPUT_PAD * numInputs;
let max = min + maxPadding;
let spread = max - min;
let halfSpread = Math.ceil(spread / 2);
let mid = min + halfSpread;
let fees = { min, mid, max };
return fees;
};
Tx._appraiseMemos = function (outputs) {
let size = 0;
for (let output of outputs) {
if ("string" === typeof output.message) {
if (!output.memo) {
output.memo = TxUtils.strToHex(output.message);
}
}
if ("string" === typeof output.memo) {
let memoSize = output.memo.length / 2;
if (memoSize > MAX_U8) {
size += 2;
} else if (memoSize >= OP_PUSHDATA1_INT) {
size += 1;
}
size += OP_RETURN_HEADER_SIZE + memoSize;
continue;
}
size += Tx.OUTPUT_SIZE;
}
return size;
};
Tx.toDash = function (satoshis) {
let dashNum = satoshis / SATOSHIS;
let dashStr = dashNum.toFixed(8);
let floatBalance = parseFloat(dashStr);
return floatBalance;
};
Tx.toSats = function (dash) {
let sats = dash * SATOSHIS;
sats = Math.round(sats);
return sats;
};
Tx.create = function (keyUtils) {
if (!keyUtils?.getPrivateKey) {
throw new Error(`you must create with 'opts.getPrivateKey()'`);
}
if (!keyUtils.getPublicKey) {
if (!keyUtils.toPublicKey) {
const errGetPubKey =
"you must provide 'getPublicKey()' (efficient) or 'toPublicKey()' (to convert private key)";
throw new Error(errGetPubKey);
}
/** @type {TxGetPublicKey} */
keyUtils.getPublicKey = async function (txInput, i, txInputs) {
let privKeyBytes = await keyUtils.getPrivateKey(txInput, i, txInputs);
//@ts-ignore - toPublicKey *is* defined above
let pubKeyBytes = await keyUtils.toPublicKey(privKeyBytes);
if ("string" === typeof pubKeyBytes) {
throw new Error("toPublicKey() must return bytes (Uint8Array)");
}
return pubKeyBytes;
};
}
/** @type {TxDeps} */
//@ts-ignore
let keyDeps = keyUtils;
let txInst = {};
/** @type {TxHashAndSignAll} */
txInst.hashAndSignAll = async function (txInfo, sigHashType) {
let sortedInputs = txInfo.inputs.slice(0);
sortedInputs.sort(Tx.sortInputs);
for (let i = 0; i < sortedInputs.length; i += 1) {
let isSelf = sortedInputs[i] === txInfo.inputs[i];
if (!isSelf) {
console.warn(
`txInfo.inputs are not ordered correctly, use txInfo.inputs.sort(Tx.sortInputs)\n(this will be an exception in the next version)`,
);
break;
}
}
let sortedOutputs = txInfo.outputs.slice(0);
sortedOutputs.sort(Tx.sortOutputs);
for (let i = 0; i < sortedOutputs.length; i += 1) {
let isSelf = sortedOutputs[i] === txInfo.outputs[i];
if (!isSelf) {
console.warn(
`txInfo.outputs are not ordered correctly, use txInfo.outputs.sort(Tx.sortOutputs)\n(this will be an exception in the next version)`,
);
break;
}
}
/** @type {TxInfoSigned} */
let txInfoSigned = {
version: txInfo.version || CURRENT_VERSION,
type: txInfo.type || TYPE_VERSION,
/** @type {Array<TxInputSigned>} */
inputs: [],
outputs: txInfo.outputs,
locktime: txInfo.locktime || 0x00,
extraPayload: txInfo.extraPayload || "",
transaction: "",
};
for (let i = 0; i < txInfo.inputs.length; i += 1) {
let txInput = txInfo.inputs[i];
let privBytes = await keyDeps.getPrivateKey(txInput, i, txInfo.inputs);
if (privBytes) {
txInput = await txInst.hashAndSignInput(
privBytes,
txInfo,
i,
sigHashType,
);
} else if (privBytes !== null) {
throw new Error(E_KEYBYTES_UNDEFINED);
} else {
// same as txInput = Tx.createInputRaw(txInput, i);
// (but we don't want to strip .address, etc)
}
//@ts-ignore - TODO - may be partially signed
txInfoSigned.inputs.push(txInput);
}
txInfoSigned.transaction = Tx.serialize(txInfoSigned);
return txInfoSigned;
};
/** @type {TxHashAndSignInput} */
txInst.hashAndSignInput = async function (
privBytes,
txInfo,
i,
sigHashType,
) {
let txInput = txInfo.inputs[i];
let _sigHashType =
txInput.sigHashType ?? sigHashType ?? Tx.SIGHASH_DEFAULT;
// let inputs = Tx.selectSigHashInputs(txInfo, i, _sigHashType);
// let outputs = Tx.selectSigHashOutputs(txInfo, i, _sigHashType);
// let txForSig = Object.assign({}, txInfo, { inputs, outputs });
// let txSigHash = Tx.createForSig(txForSig, i, _sigHashType);
let txSigHash = Tx.createForSig(txInfo, i, _sigHashType);
let txHex = Tx.serialize(txSigHash, _sigHashType);
let txBytes = Tx.utils.hexToBytes(txHex);
let txHashBuf = await Tx.doubleSha256(txBytes);
let sigBuf = await keyDeps.sign(privBytes, txHashBuf);
let sigHex = "";
if ("string" === typeof sigBuf) {
console.warn(`sign() should return a Uint8Array of an ASN.1 signature`);
sigHex = sigBuf;
} else {
sigHex = Tx.utils.bytesToHex(sigBuf);
}
let pubKeyHex = txInput.publicKey;
if (!pubKeyHex) {
let pubKey = await keyDeps.getPublicKey(txInput, i, txInfo.inputs);
if (!pubKey) {
throw new Error(`no public key for input ${i}`);
}
pubKeyHex = Tx.utils.bytesToHex(pubKey);
}
if ("string" !== typeof pubKeyHex) {
let warn = new Error("stack");
console.warn(
`utxo inputs should be plain JSON and use hex rather than buffers for 'publicKey'`,
warn.stack,
);
pubKeyHex = Tx.utils.bytesToHex(pubKeyHex);
}
/** @type TxInputSigned */
let txInputSigned = Object.assign(
{
_transaction: txHex,
_hash: Tx.utils.bytesToHex(txHashBuf),
_indexForSig: txSigHash.indexForSig,
_lockScript: txSigHash.inputs[txSigHash.indexForSig].script,
},
txInput,
{
txid: txInput.txId || txInput.txid,
txId: txInput.txId || txInput.txid,
outputIndex: txInput.outputIndex,
signature: sigHex,
publicKey: pubKeyHex,
sigHashType: _sigHashType,
},
);
return txInputSigned;
};
txInst.legacy = {};
/**
* @param {Object} opts
* @param {Array<CoreUtxo>?} [opts.inputs]
* @param {Array<CoreUtxo>?} [opts.utxos]
* @param {TxOutput} opts.output
* @returns {TxDraft}
*/
txInst.legacy.draftSingleOutput = function ({ utxos, inputs, output }) {
let fullTransfer = false;
if (!inputs) {
inputs = DashTx._legacyMustSelectInputs({
utxos: utxos,
satoshis: output.satoshis,
});
if (!inputs) {
// tsc can't tell that 'inputs' was just guaranteed
throw new Error(`type checker workaround`);
}
} else {
fullTransfer = !output.satoshis;
}
let totalAvailable = DashTx.sum(inputs);
//@ts-ignore - TODO update typedefs
let fees = DashTx.appraise({ inputs: inputs, outputs: [output] });
//let EXTRA_SIG_BYTES_PER_INPUT = 2;
let CHANCE_INPUT_SIGS_HAVE_NO_EXTRA_BYTES = 1 / 4;
let MINIMUM_CHANCE_SIG_MATCHES_TARGET = 1 / 20;
let feeTarget = fees.min;
let chanceSignaturesMatchLowestFee = Math.pow(
CHANCE_INPUT_SIGS_HAVE_NO_EXTRA_BYTES,
inputs.length,
);
let minimumIsUnlikely =
chanceSignaturesMatchLowestFee < MINIMUM_CHANCE_SIG_MATCHES_TARGET;
if (minimumIsUnlikely) {
//let likelyPadByteSize = EXTRA_SIG_BYTES_PER_INPUT * inputs.length;
let likelyPadByteSize = inputs.length;
feeTarget += likelyPadByteSize;
}
let recip = Object.assign({}, output);
if (!recip.satoshis) {
recip.satoshis = totalAvailable + -feeTarget;
}
let outputs = [recip];
let change;
let changeSats =
totalAvailable + -recip.satoshis + -feeTarget + -DashTx.OUTPUT_SIZE;
let hasChange = changeSats > DashTx.LEGACY_DUST;
if (hasChange) {
change = { address: "", satoshis: changeSats };
outputs.push(change);
feeTarget += DashTx.OUTPUT_SIZE;
} else {
change = null;
// Re: Dash Direct: we round in favor of the network (exact payments)
feeTarget = totalAvailable + -recip.satoshis;
}
let txInfoRaw = {
inputs,
outputs,
change,
feeTarget,
fullTransfer,
};
//@ts-ignore - TODO update typedefs
return txInfoRaw;
};
/**
* @param {TxDraft} txDraft
* @returns {Promise<TxSummary>}
*/
txInst.legacy.finalizePresorted = async function (txDraft) {
/** @type {TxInfoSigned} */
let txSigned = await txInst.legacy
._signToTarget(txDraft)
.catch(async function (e) {
if ("E_NO_ENTROPY" !== e.code) {
throw e;
}
let _txSigned = await txInst.legacy._signFeeWalk(txDraft);
return _txSigned;
});
let txSummary = txInst.legacy._summarizeTx(txSigned);
return txSummary;
};
/**
* @param {TxDraft} txDraft
* @returns {Promise<TxInfoSigned>}
*/
txInst.legacy._signToTarget = async function (txDraft) {
let limit = 128;
let lastTx = "";
let hasEntropy = true;
/** @type {TxInfoSigned} */
let txSigned;
let fee;
for (let n = 0; true; n += 1) {
txSigned = await txInst.hashAndSignAll(txDraft);
fee = txSigned.transaction.length / 2;
if (fee <= txDraft.feeTarget) {
break;
}
if (txSigned.transaction === lastTx) {
hasEntropy = false;
break;
}
lastTx = txSigned.transaction;
if (n >= limit) {
let msg = `(near-)infinite loop: fee is ${fee} trying to hit target fee of ${txDraft.feeTarget}`;
throw new Error(msg);
}
}
if (!hasEntropy) {
let err = new Error(
"secp256k1 implementation does not use signature entropy",
);
Object.assign(err, { code: "E_NO_ENTROPY" });
throw err;
}
return txSigned;
};
/**
* Strategy for signing transactions when a non-entropy signing method is used -
* exhaustively walk each possible signature until one that works is found.
* @param {TxDraft} txDraft
* @returns {Promise<TxInfoSigned>}
*/
txInst.legacy._signFeeWalk = async function (txDraft) {
//@ts-ignore - TODO should have satoshis by now
let totalIn = DashTx.sum(txDraft.inputs);
let totalOut = DashTx.sum(txDraft.outputs);
let totalFee = totalIn - totalOut;
let fees = DashTx.appraise(txDraft);
let limit = fees.max - totalFee;
/** @type TxInfoSigned */
let txSigned;
for (let n = 0; true; n += 1) {
let changeSats = txDraft.change?.satoshis || 0;
let hasChange = changeSats > 0;
let canIncreaseFee = txDraft.fullTransfer || hasChange;
if (!canIncreaseFee) {
// TODO try to add another utxo before failing
throw new Error(
`no signing entropy and the fee variance is too low to cover the marginal cost of all possible signature iterations`,
);
}
let outIndex = 0;
if (hasChange) {
outIndex = txDraft.outputs.length - 1;
}
txDraft.outputs[outIndex].satoshis -= 1;
totalFee += 1;
txSigned = await txInst.hashAndSignAll(txDraft);
let byteFee = txSigned.transaction.length / 2;
if (byteFee <= totalFee) {
break;
}
if (n >= limit) {
throw new Error(
`(near-)infinite loop: fee is ${byteFee} trying to hit target fee of ${txDraft.feeTarget}`,
);
}
}
return txSigned;
};
/**
* @param {TxInfoSigned} txInfo
* @returns {TxSummary}
*/
txInst.legacy._summarizeTx = function (txInfo) {
//@ts-ignore - our inputs are mixed with CoreUtxo
let totalAvailable = Tx.sum(txInfo.inputs);
let recipient = txInfo.outputs[0];
// to satisfy tsc
if (!recipient.address) {
recipient.address = "";
}
let sent = recipient.satoshis;
let fee = totalAvailable - sent;
let changeSats = 0;
let change = txInfo.outputs[1];
if (change) {
changeSats = change.satoshis;
}
fee -= changeSats;
// 000 0.00 000 000
let summaryPartial = {
total: totalAvailable,
sent: sent,
fee: fee,
output: recipient,
recipient: recipient,
change: change,
};
let summary = Object.assign({}, txInfo, summaryPartial);
return summary;
};
return txInst;
};
Tx.selectSigHashInputs = function (
txInfo,
i,
sigHashType = Tx.SIGHASH_DEFAULT,
) {
let inputs = txInfo.inputs;
if (sigHashType & Tx.SIGHASH_ANYONECANPAY) {
let txInput = txInfo.inputs[i];
inputs = [txInput];
}
return inputs;
};
Tx.selectSigHashOutputs = function (
txInfo,
i,
sigHashType = Tx.SIGHASH_DEFAULT,
) {
let outputs = txInfo.outputs;
if (sigHashType & Tx.SIGHASH_ALL) {
return outputs;
}
if (sigHashType & Tx.SIGHASH_NONE) {
outputs = [];
return outputs;
}
if (sigHashType & Tx.SIGHASH_SINGLE) {
let output = txInfo.outputs[i];
outputs = [output];
throw new Error(
"SIGHASH_SINGLE conflicts with BIP-69, see https://github.com/dashhive/DashTx.js/issues/66",
);
}
throw new Error(
`expected SIGHASH_[ALL|NONE], but got unrecognized type: ${sigHashType}`,
);
};
/**
* Creates a transaction that is guaranteed to be signable. Selects
* the smallest coin that is bigger or equal to the amount sent + fees,
* or the largest available coins until that total is met.
*/
//@ts-ignore - TODO update typedefs
Tx.createLegacyTx = function (coins, outputs, changeOutput, extraPayload) {
// TODO bump to 4 for DIP: enforce tx hygiene
let version = CURRENT_VERSION;
let type = TYPE_VERSION;
coins = coins.slice(0);
outputs = outputs.slice(0);
changeOutput = Object.assign({}, changeOutput);
coins.sort(Tx.sortBySatsAsc);
let totalBalance = Tx.sum(coins);
/** @type {Array<TxInputUnspent>} */
let inputs = [];
//@ts-ignore - TODO update typedefs
let fees = DashTx.appraise({ inputs, outputs });
let taxes = fees.max;
// requires at least one input
taxes += Tx.MAX_INPUT_SIZE;
let subtotal = Tx.sum(outputs);
let total = subtotal + taxes;
let cash = 0;
/** @type {Array<TxInputUnspent>} */
let biggerOrEqual = [];
for (;;) {
let input = coins.pop();
if (input) {
if (input.satoshis >= total) {
biggerOrEqual.push(input);
continue;
}
}
if (biggerOrEqual.length) {
input = biggerOrEqual.pop();
}
if (!input) {
break;
}
let sats = input.satoshis;
cash += sats;
inputs.push(input);
if (cash >= total) {
break;
}
// requires at least one more input
total += Tx.MAX_INPUT_SIZE;
}
if (cash < total) {
total -= Tx.MAX_INPUT_SIZE;
if (cash < totalBalance) {
throw new Error(
`developer error: did not use full balance of ${totalBalance} when calculating available balance of ${cash} to pay ${total}`,
);
}
throw new Error(
`balance of ${cash} cannot pay for the transaction + fees of ${total}`,
);
}
let change = 0;
let dust = cash + -total + -Tx.OUTPUT_SIZE;
if (dust >= Tx.LEGACY_DUST) {
change = dust;
changeOutput.satoshis = change;
outputs.push(changeOutput);
total += Tx.OUTPUT_SIZE;
}
taxes = total - subtotal;
inputs.sort(Tx.sortInputs);
outputs.sort(Tx.sortOutputs);
let changeIndex = outputs.indexOf(changeOutput);
let locktime = 0;
let txInfo = {
version,
type,
inputs,
outputs,
changeIndex,
locktime,
extraPayload,
};
// let change = txInfo.outputs[txInfo.changeIndex];
return txInfo;
};
//@ts-ignore - old usage - TODO REMOVE for v1
Tx.legacyCreateTx = Tx.createLegacyTx;
Tx.sortBySatsAsc = function (a, b) {
let aSats = a.satoshis;
let bSats = b.satoshis;
let diff = aSats - bSats;
if (diff > 0) {
return 1;
}
if (diff < 0) {
return -1;
}
return 0;
};
Tx.sortBySatsDsc = function (a, b) {
let aSats = a.satoshis;
let bSats = b.satoshis;
let diff = aSats - bSats;
if (diff > 0) {
return -1;
}
if (diff < 0) {
return 1;
}
return 0;
};
/**
* Lexicographical Indexing of Transaction Inputs and Outputs
* See <https://github.com/bitcoin/bips/blob/master/bip-0069.mediawiki>
*
* Keeps ordering deterministic to avoid data leakage.
*
* - ASC `txId` (a.k.a. `txid`, `prev_hash`)
* Note: the comparison is done with the normal (Big-Endian) ordering
* whereas the byte order of wire format is reversed (Little-Endian)
*
* - ASC `outputIndex` (a.k.a. `output_index`, `vout`)
*/
Tx.sortInputs = function (a, b) {
let aTxid = a.txId || a.txid;
let bTxid = b.txId || b.txid;
// Ascending Lexicographical on TxId (prev-hash) in-memory (not wire) byte order
if (aTxid > bTxid) {
return 1;
}
if (aTxid < bTxid) {
return -1;
}
// Ascending Vout (Numerical)
let indexDiff = a.outputIndex - b.outputIndex;
return indexDiff;
};
/**
* Lexicographical Indexing of Transaction Inputs and Outputs
* See <https://github.com/bitcoin/bips/blob/master/bip-0069.mediawiki>
*
* Note: this must be updated to support new types of script comparison.
*
* @param {TxOutputSortable} a
* @param {TxOutputSortable} b
* @returns {Uint32}
*/
Tx.sortOutputs = function (a, b) {
// the complexity is inherent, and doesn't seem to be reasonable to break out
/* jshint maxcomplexity:30 */
let satsA = a.satoshis;
let satsB = b.satoshis;
let sats = satsA - satsB;
if (sats < 0) {
return -1;
}
if (sats > 0) {
return 1;
}
// memo vs non-memo is settled by 'satoshis' being 0
// (otherwise there's a bug)
if (typeof a.memo === "string") {
if (typeof b.memo !== "string") {
throw new Error(`'satoshis' must be above 0, except for memos`);
}
if (a.memo < b.memo) {
return -1;
}
if (a.memo > b.memo) {
return 1;
}
return 0;
}
if (a.pubKeyHash && b.pubKeyHash) {
if (a.pubKeyHash > b.pubKeyHash) {
return 1;
}
if (a.pubKeyHash < b.pubKeyHash) {
return -1;
}
return 0;
}
if (a.address && b.address) {
if (a.address > b.address) {
return 1;
}
if (a.address < b.address) {
return -1;
}
return 0;
}
let scriptTypeA = `${OP_DUP}${OP_HASH160}`;
let scriptTypeB = scriptTypeA;
if (a.script) {
scriptTypeA = a.script.slice(0, 4);
}
if (b.script) {
scriptTypeB = b.script.slice(0, 4);
}
if (scriptTypeA < scriptTypeB) {
return -1;
}
if (scriptTypeA > scriptTypeB) {
return 1;
}
if (a.script && b.script) {
if (a.script < b.script) {
return -1;
}
if (a.script > b.script) {
return 1;
}
return 0;
}
let jsonA = JSON.stringify(a, null, 2);
let jsonB = JSON.stringify(b, null, 2);
throw new Error(
`developer error: these outputs cannot be compared:\n${jsonA}\n${jsonB}\n(probably either mixed types - address & pubKeyHash - or unsupported output types were given)`,
);
};
/**
* @template {Pick<CoreUtxo, "satoshis">} T
* @param {Object} opts
* @param {Array<T>} opts.utxos
* @param {Uint53} [opts.satoshis]
* @param {Uint53} [opts.now] - ms
* @returns {Array<T>}
*/
Tx._legacyMustSelectInputs = function ({ utxos, satoshis }) {
if (!satoshis) {
let msg = `expected target selection value 'satoshis' to be a positive integer but got '${satoshis}'`;
let err = new Error(msg);
throw err;
}
let selected = Tx._legacySelectOptimalUtxos(utxos, satoshis);
if (!selected.length) {
throw Tx._createInsufficientFundsError(utxos, satoshis);
}
return selected;
};
/**
* @template {Pick<CoreUtxo, "satoshis">} T
* @param {Array<T>} utxos
* @param {Uint53} outputSats
* @return {Array<T>}
*/
Tx._legacySelectOptimalUtxos = function (utxos, outputSats) {
let numOutputs = 1;
let extraSize = 0;
let fees = DashTx._appraiseCounts(utxos.length, numOutputs, extraSize);
let fullSats = outputSats + fees.min;
let balance = Tx.sum(utxos);
if (balance < fullSats) {
/** @type Array<T> */
return [];
}
// from largest to smallest
utxos.sort(function (a, b) {
return b.satoshis - a.satoshis;
});