thor-devkit
Version:
Typescript library to aid DApp development on VeChain Thor
313 lines • 25.6 kB
JavaScript
import { address } from './address';
import { blake2b256 } from './blake2b';
import { RLP } from './rlp';
import { secp256k1 } from './secp256k1';
import { Buffer } from 'buffer';
/** Transaction class defines VeChainThor's multi-clause transaction */
export class Transaction {
/**
* construct a transaction object with given body
* @param body body of tx
*/
constructor(body) {
this.body = Object.assign({}, body);
}
/** decode from Buffer to transaction
* @param raw encoded buffer
* @param unsigned to indicator if the encoded buffer contains signature
*/
static decode(raw, unsigned) {
let type;
if (raw.length > 0 && raw[0] > 0x7f) {
type = Transaction.Type.Legacy;
}
else {
if (raw.length === 0) {
throw new Error('typed transaction too short');
}
if (raw[0] === Transaction.Type.DynamicFee) {
type = Transaction.Type.DynamicFee;
// remove type identifier for subsequent decoding
raw = raw.slice(1);
}
else {
throw new Error('transaction type not supported: ' + raw[0]);
}
}
let body;
let signature;
if (unsigned) {
body = type === Transaction.Type.DynamicFee ?
unsignedDynamicFeeTxRLP.decode(raw) :
unsignedLegacyTxRLP.decode(raw);
body.type = type;
}
else {
const decoded = type === Transaction.Type.DynamicFee ?
dynamicFeeTxRLP.decode(raw) :
legacyTxRLP.decode(raw);
signature = decoded.signature;
delete decoded.signature;
body = decoded;
body.type = type;
}
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;
}
/**
* 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.recover(signingHash, this.signature.slice(0, 65));
const origin = address.fromPublicKey(pubKey);
return '0x' + blake2b256(signingHash, Buffer.from(origin.slice(2), 'hex')).toString('hex');
}
catch (_a) {
return null;
}
}
/** returns transaction type, type legacy will return if type is not set */
get type() {
if (this.body.hasOwnProperty('type') && this.body.type !== undefined) {
return this.body.type;
}
return Transaction.Type.Legacy;
}
/**
* 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) {
this.checkType();
const reserved = this._encodeReserved();
let buf;
if (this.type === Transaction.Type.DynamicFee) {
const raw = unsignedDynamicFeeTxRLP.encode(Object.assign(Object.assign({}, this.body), { reserved }));
buf = Buffer.concat([Buffer.from([Transaction.Type.DynamicFee]), raw]);
}
else {
buf = unsignedLegacyTxRLP.encode(Object.assign(Object.assign({}, this.body), { reserved }));
}
const hash = blake2b256(buf);
if (delegateFor) {
if (!/^0x[0-9a-f]{40}$/i.test(delegateFor)) {
throw new Error('delegateFor expected address');
}
return 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.recover(signingHash, this.signature.slice(0, 65));
return address.fromPublicKey(pubKey);
}
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.recover(signingHash, this.signature.slice(65));
return address.fromPublicKey(pubKey);
}
catch (_a) {
return null;
}
}
/** returns whether delegated. see https://github.com/vechain/VIPs/blob/master/vips/VIP-191.md */
get delegated() {
var _a, _b;
// tslint:disable-next-line:no-bitwise
return (((_b = ((_a = this.body.reserved) !== null && _a !== void 0 ? _a : {}).features) !== null && _b !== void 0 ? _b : 0) & Transaction.DELEGATED_MASK) === Transaction.DELEGATED_MASK;
}
/** returns intrinsic gas it takes */
get intrinsicGas() {
return Transaction.intrinsicGas(this.body.clauses);
}
/** encode into Buffer */
encode() {
this.checkType();
const reserved = this._encodeReserved();
if (this.type === Transaction.Type.DynamicFee) {
const raw = this.signature ?
dynamicFeeTxRLP.encode(Object.assign(Object.assign({}, this.body), { reserved, signature: this.signature })) :
unsignedDynamicFeeTxRLP.encode(Object.assign(Object.assign({}, this.body), { reserved }));
return Buffer.concat([Buffer.from([Transaction.Type.DynamicFee]), raw]);
}
return this.signature ?
legacyTxRLP.encode(Object.assign(Object.assign({}, this.body), { reserved, signature: this.signature })) :
unsignedLegacyTxRLP.encode(Object.assign(Object.assign({}, this.body), { reserved }));
}
_encodeReserved() {
var _a, _b, _c;
const reserved = (_a = this.body.reserved) !== null && _a !== void 0 ? _a : {};
const list = [featuresKind.data((_b = reserved.features) !== null && _b !== void 0 ? _b : 0, 'reserved.features').encode(),
...((_c = reserved.unused) !== null && _c !== void 0 ? _c : [])];
// 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;
}
checkType() {
// allow type to be undefined to be compatible with older spec
if (this.body.hasOwnProperty('type') && this.body.type !== undefined &&
this.body.type !== Transaction.Type.Legacy && this.body.type !== Transaction.Type.DynamicFee) {
throw new Error('unsupported transaction type: ' + this.body.type);
}
}
}
Transaction.DELEGATED_MASK = 1;
(function (Transaction) {
let Type;
(function (Type) {
Type[Type["Legacy"] = 0] = "Legacy";
Type[Type["DynamicFee"] = 81] = "DynamicFee";
})(Type = Transaction.Type || (Transaction.Type = {}));
/**
* 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.substring(i, i + 2) === '00') {
sum += zgas;
}
else {
sum += nzgas;
}
}
return sum;
}
})(Transaction || (Transaction = {}));
const unsignedLegacyTxRLP = new RLP({
name: 'unsigned legacy tx',
kind: [
{ name: 'chainTag', kind: new RLP.NumericKind(1) },
{ name: 'blockRef', kind: new RLP.CompactFixedBlobKind(8) },
{ name: 'expiration', kind: new RLP.NumericKind(4) },
{
name: 'clauses', kind: {
item: [
{ name: 'to', kind: new RLP.NullableFixedBlobKind(20) },
{ name: 'value', kind: new RLP.NumericKind(32) },
{ name: 'data', kind: new RLP.BlobKind() },
],
},
},
{ name: 'gasPriceCoef', kind: new RLP.NumericKind(1) },
{ name: 'gas', kind: new RLP.NumericKind(8) },
{ name: 'dependsOn', kind: new RLP.NullableFixedBlobKind(32) },
{ name: 'nonce', kind: new RLP.NumericKind(8) },
{ name: 'reserved', kind: { item: new RLP.BufferKind() } },
],
});
const legacyTxRLP = new RLP({
name: 'legacy tx',
kind: [...unsignedLegacyTxRLP.profile.kind, { name: 'signature', kind: new RLP.BufferKind() }],
});
const unsignedDynamicFeeTxRLP = new RLP({
name: 'unsigned dynamic fee tx',
kind: [
{ name: 'chainTag', kind: new RLP.NumericKind(1) },
{ name: 'blockRef', kind: new RLP.CompactFixedBlobKind(8) },
{ name: 'expiration', kind: new RLP.NumericKind(4) },
{
name: 'clauses', kind: {
item: [
{ name: 'to', kind: new RLP.NullableFixedBlobKind(20) },
{ name: 'value', kind: new RLP.NumericKind(32) },
{ name: 'data', kind: new RLP.BlobKind() },
],
},
},
{ name: 'maxPriorityFeePerGas', kind: new RLP.NumericKind(32) },
{ name: 'maxFeePerGas', kind: new RLP.NumericKind(32) },
{ name: 'gas', kind: new RLP.NumericKind(8) },
{ name: 'dependsOn', kind: new RLP.NullableFixedBlobKind(32) },
{ name: 'nonce', kind: new RLP.NumericKind(8) },
{ name: 'reserved', kind: { item: new RLP.BufferKind() } },
],
});
const dynamicFeeTxRLP = new RLP({
name: 'dynamic fee tx',
// tslint:disable-next-line:max-line-length
kind: [...unsignedDynamicFeeTxRLP.profile.kind, { name: 'signature', kind: new RLP.BufferKind() }],
});
const featuresKind = new RLP.NumericKind(4);
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