@meterio/devkit
Version:
Typescript library to aid DApp development on Meter network
238 lines • 17.3 kB
JavaScript
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.Transaction = void 0;
const address_1 = require("./cry/address");
const blake2b_1 = require("./cry/blake2b");
const secp256k1_1 = require("./cry/secp256k1");
const rlp_1 = require("./rlp");
/** Transaction class defines Meter's multi-clause transaction */
class Transaction {
/** decode from Buffer to transaction
* @param raw encoded buffer
* @param unsigned to indicator if the encoded buffer contains signature
*/
static decode(raw, unsigned) {
let body;
let signature;
if (unsigned) {
body = unsignedTxRLP.decode(raw);
}
else {
const decoded = txRLP.decode(raw);
signature = decoded.signature;
delete decoded.signature;
body = decoded;
}
const reserved = body.reserved;
if (reserved.length > 0) {
if (reserved[reserved.length - 1].length === 0) {
throw new Error('invalid reserved fields: not trimmed');
}
const features = featuresKind.buffer(reserved[0], 'reserved.features').decode();
body.reserved = {
features,
};
if (reserved.length > 1) {
body.reserved.unused = reserved.slice(1);
}
}
else {
delete body.reserved;
}
const tx = new Transaction(body);
if (signature) {
tx.signature = signature;
}
return tx;
}
/**
* construct a transaction object with given body
* @param body body of tx
*/
constructor(body) {
this.body = Object.assign({}, body);
}
/**
* returns transaction ID
* null returned if something wrong (e.g. invalid signature)
*/
get id() {
if (!this._signatureValid) {
return null;
}
try {
const signingHash = this.signingHash();
const pubKey = secp256k1_1.secp256k1.recover(signingHash, this.signature.slice(0, 65));
const origin = (0, address_1.publicKeyToAddress)(pubKey);
return '0x' + (0, blake2b_1.blake2b256)(signingHash, origin).toString('hex');
}
catch (_a) {
return null;
}
}
/**
* compute signing hashes.
* It returns tx hash for origin or delegator depends on param `delegateFor`.
* @param delegateFor address of intended tx origin. If set, the returned hash is for delegator to sign.
*/
signingHash(delegateFor) {
const reserved = this._encodeReserved();
const buf = unsignedTxRLP.encode(Object.assign(Object.assign({}, this.body), { reserved }));
const hash = (0, blake2b_1.blake2b256)(buf);
if (delegateFor) {
if (!/^0x[0-9a-f]{40}$/i.test(delegateFor)) {
throw new Error('delegateFor expected address');
}
return (0, blake2b_1.blake2b256)(hash, Buffer.from(delegateFor.slice(2), 'hex'));
}
return hash;
}
/** returns tx origin. null returned if no signature or not incorrectly signed */
get origin() {
if (!this._signatureValid) {
return null;
}
try {
const signingHash = this.signingHash();
const pubKey = secp256k1_1.secp256k1.recover(signingHash, this.signature.slice(0, 65));
return '0x' + (0, address_1.publicKeyToAddress)(pubKey).toString('hex');
}
catch (_a) {
return null;
}
}
/** returns tx delegator. null returned if no signature or not incorrectly signed */
get delegator() {
if (!this.delegated) {
return null;
}
if (!this._signatureValid) {
return null;
}
const origin = this.origin;
if (!origin) {
return null;
}
try {
const signingHash = this.signingHash(origin);
const pubKey = secp256k1_1.secp256k1.recover(signingHash, this.signature.slice(65));
return '0x' + (0, address_1.publicKeyToAddress)(pubKey).toString('hex');
}
catch (_a) {
return null;
}
}
/** returns whether delegated. see https://github.com/dfinlab/VIPs/blob/master/vips/VIP-191.md */
get delegated() {
return ((((this.body.reserved || {}).features || 0) & Transaction.DELEGATED_MASK) ===
Transaction.DELEGATED_MASK);
}
/** returns intrinsic gas it takes */
get intrinsicGas() {
return Transaction.intrinsicGas(this.body.clauses);
}
/** encode into Buffer */
encode() {
const reserved = this._encodeReserved();
if (this.signature) {
return txRLP.encode(Object.assign(Object.assign({}, this.body), { reserved, signature: this.signature }));
}
return unsignedTxRLP.encode(Object.assign(Object.assign({}, this.body), { reserved }));
}
_encodeReserved() {
const reserved = this.body.reserved || {};
const list = [
featuresKind.data(reserved.features || 0, 'reserved.features').encode(),
...(reserved.unused || []),
];
// trim
while (list.length > 0) {
if (list[list.length - 1].length === 0) {
list.pop();
}
else {
break;
}
}
return list;
}
get _signatureValid() {
const expectedSigLen = this.delegated ? 65 * 2 : 65;
return this.signature ? this.signature.length === expectedSigLen : false;
}
}
Transaction.DELEGATED_MASK = 1;
exports.Transaction = Transaction;
(function (Transaction) {
/**
* calculates intrinsic gas that a tx costs with the given clauses.
* @param clauses
*/
function intrinsicGas(clauses) {
const txGas = 5000;
const clauseGas = 16000;
const clauseGasContractCreation = 48000;
if (clauses.length === 0) {
return txGas + clauseGas;
}
return clauses.reduce((sum, c) => {
if (c.to) {
sum += clauseGas;
}
else {
sum += clauseGasContractCreation;
}
sum += dataGas(c.data);
return sum;
}, txGas);
}
Transaction.intrinsicGas = intrinsicGas;
function dataGas(data) {
const zgas = 4;
const nzgas = 68;
let sum = 0;
for (let i = 2; i < data.length; i += 2) {
if (data.substr(i, 2) === '00') {
sum += zgas;
}
else {
sum += nzgas;
}
}
return sum;
}
})(Transaction = exports.Transaction || (exports.Transaction = {}));
exports.Transaction = Transaction;
const unsignedTxRLP = new rlp_1.RLP({
name: 'tx',
kind: [
{ name: 'chainTag', kind: new rlp_1.RLP.NumericKind(1) },
{ name: 'blockRef', kind: new rlp_1.RLP.CompactFixedBlobKind(8) },
{ name: 'expiration', kind: new rlp_1.RLP.NumericKind(4) },
{
name: 'clauses',
kind: {
item: [
{ name: 'to', kind: new rlp_1.RLP.NullableFixedBlobKind(20) },
{ name: 'value', kind: new rlp_1.RLP.NumericKind(32) },
{ name: 'token', kind: new rlp_1.RLP.NumericKind(1) },
{ name: 'data', kind: new rlp_1.RLP.BlobKind() },
],
},
},
{ name: 'gasPriceCoef', kind: new rlp_1.RLP.NumericKind(1) },
{ name: 'gas', kind: new rlp_1.RLP.NumericKind(8) },
{ name: 'dependsOn', kind: new rlp_1.RLP.NullableFixedBlobKind(32) },
{ name: 'nonce', kind: new rlp_1.RLP.NumericKind(8) },
{ name: 'reserved', kind: { item: new rlp_1.RLP.BufferKind() } },
],
});
const txRLP = new rlp_1.RLP({
name: 'tx',
kind: [
...unsignedTxRLP.profile.kind,
{ name: 'signature', kind: new rlp_1.RLP.BufferKind() },
],
});
const featuresKind = new rlp_1.RLP.NumericKind(4);
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