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229 | 1×
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48×
| const ethUtil = require('ethereumjs-util')
const fees = require('ethereum-common')
const ecdsa = require('secp256k1')
const BN = ethUtil.BN
const rlp = ethUtil.rlp
// give browser access to Buffers
global.Buffer = Buffer
global.ethUtil = ethUtil
/**
* Represents a transaction
* @constructor
* @param {Buffer|Array} data raw data, deserialized
*/
var Transaction = module.exports = function (data) {
// Define Properties
const fields = [{
name: 'nonce',
length: 32,
allowLess: true,
default: new Buffer([])
}, {
name: 'gasPrice',
length: 32,
allowLess: true,
default: new Buffer([])
}, {
name: 'gasLimit',
length: 32,
allowLess: true,
default: new Buffer([])
}, {
name: 'to',
allowZero: true,
length: 20,
default: new Buffer([])
}, {
name: 'value',
length: 32,
allowLess: true,
default: new Buffer([])
}, {
name: 'data',
allowZero: true,
default: new Buffer([])
}, {
name: 'v',
length: 1,
default: new Buffer([0x1c])
}, {
name: 'r',
length: 32,
allowLess: true,
default: new Buffer([])
}, {
name: 's',
length: 32,
allowLess: true,
default: new Buffer([])
}]
Object.defineProperty(this, 'from', {
enumerable: false,
configurable: true,
get: function () {
if (this._from) {
return this._from
}
this._from = this.getSenderAddress()
return this._from
},
set: function (v) {
this._from = v
}
})
ethUtil.defineProperties(this, fields, data)
}
/**
* Returns the rlp encoding of the transaction
* @method serialize
* @return {Buffer}
*/
Transaction.prototype.serialize = function () {
return rlp.encode(this.raw)
}
/**
* Computes a sha3-256 hash of the tx
* @method hash
* @param {Boolean} [true] signature - whether or not to inculde the signature
* @return {Buffer}
*/
Transaction.prototype.hash = function (signature) {
var toHash
Iif (typeof signature === 'undefined') {
signature = true
}
Iif (signature) {
toHash = this.raw
} else {
toHash = this.raw.slice(0, 6)
}
// create hash
return ethUtil.sha3(rlp.encode(toHash))
}
/**
* gets the senders address
* @method getSenderAddress
* @return {Buffer}
*/
Transaction.prototype.getSenderAddress = function () {
var pubKey = this.getSenderPublicKey()
pubKey = ecdsa.publicKeyConvert(pubKey, false)
return ethUtil.pubToAddress(pubKey)
}
/**
* gets the senders public key
* @method getSenderPublicKey
* @return {Buffer}
*/
Transaction.prototype.getSenderPublicKey = function () {
Iif (!this._senderPubKey || !this._senderPubKey.length) {
this.verifySignature()
}
return this._senderPubKey
}
/**
* @method verifySignature
* @return {Boolean}
*/
Transaction.prototype.verifySignature = function () {
var msgHash = this.hash(false)
var sig = {
signature: Buffer.concat([ethUtil.pad(this.r, 32), ethUtil.pad(this.s, 32)], 64),
recovery: ethUtil.bufferToInt(this.v) - 27
}
try {
this._senderPubKey = ecdsa.recoverSync(msgHash, sig.signature, sig.recovery)
} catch (e) {
return false
}
Iif (!this._senderPubKey) {
return false
}
// hack to force elliptic to verify
Iif (process.browser) {
var result = ecdsa.verifySync(msgHash, sig.signature, this._senderPubKey)
if (!result) {
this._senderPubKey = null
}
} else {
result = !!this._senderPubKey
}
return result
}
/**
* sign a transaction with a given a private key
* @method sign
* @param {Buffer} privateKey
*/
Transaction.prototype.sign = function (privateKey) {
var msgHash = this.hash(false)
var sig = ecdsa.signSync(msgHash, privateKey)
this.r = sig.signature.slice(0, 32)
this.s = sig.signature.slice(32, 64)
this.v = sig.recovery + 27
}
/**
* The amount of gas paid for the data in this tx
* @method getDataFee
* @return {bn.js}
*/
Transaction.prototype.getDataFee = function () {
const data = this.raw[5]
var cost = new BN(0)
for (var i = 0; i < data.length; i++) {
if (data[i] === 0) {
cost.iaddn(fees.txDataZeroGas.v)
} else {
cost.iaddn(fees.txDataNonZeroGas.v)
}
}
return cost
}
/**
* the base amount of gas it takes to be a valid tx
* @method getBaseFee
* @return {bn.js}
*/
Transaction.prototype.getBaseFee = function () {
return this.getDataFee().addn(fees.txGas.v)
}
/**
* the up front amount that an account must have for this transaction to be valid
* @method getUpfrontCost
* @return {BN}
*/
Transaction.prototype.getUpfrontCost = function () {
return new BN(this.gasLimit)
.mul(new BN(this.gasPrice))
.add(new BN(this.value))
}
/**
* validates the signature and checks to see if it has enough gas
* @method validate
* @return {Boolean}
*/
Transaction.prototype.validate = function () {
return this.verifySignature() && (Number(this.getBaseFee().toString()) <= ethUtil.bufferToInt(this.gasLimit))
}
|