seeleteam.js/src/tx.js

Generic script api library for Seele blockchain

const createKeccakHash = require('keccak')
const secp256k1 = require('secp256k1')
const rlp = require('rlp')

/**
 * Creates a new transaction object.
 * @example 
 * var rawTx = {
 *   "From":"0xa61e5b0b30e91c4ae10dda3a6ddeb9d9d35ebfe1",
 *    "To":"0x0000000000000000000000000000000000000000",
 *    "Amount":0,
 *    "AccountNonce":123,
 *    "GasPrice":1,
 *    "GasLimit":3000000,
 *    "Timestamp":0,
 *    "Payload":"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 * }
 * var tx = new Transaction(rawTx);
 * @class Seele Transaction
 * @property {Buffer} raw The raw rlp encoded transaction
 * @param {Buffer} rawTx.From the from address
 * @param {Buffer} rawTx.To the to address
 * @param {Buffer} rawTx.Amount the amount of ether sent
 * @param {Buffer} rawTx.AccountNonce nonce number
 * @param {Buffer} rawTx.GasPrice transaction gas price
 * @param {Buffer} rawTx.GasLimit maximum gas for contract creation/execution
 * @param {Buffer} rawTx.Timestamp the timestamp of the transaction creation. Always be *0*.
 * @param {Buffer} rawTx.Payload this will contain the data of the message or the init of a contract
 * @todo Check the rawTx properties, if it's null, set the default value.
 **/
class Transaction {
    constructor (rawTx) {
        rawTx = rawTx || {}
        
        var raw=[]
        for(var i in rawTx){
            raw.push(rawTx[i])
        }
        this.raw = raw
        this.Data = rawTx
    }

    /**
    * Computes a sha3-256 hash of the serialized tx
    * @return {Buffer}
    */
    hash() {
        var c = rlp.encode(this.raw)
        return createKeccakHash('keccak256').update(c).digest()
    }

   /**
    * Sign a transaction with a given private key
    * @example 
    * var hashBuffer = tx.hash()
    * var privatekey = Buffer.from("24ce9cadcc9207c94296db166ab7a0fa686f2a6d29f7ea54fe8c22271c40812e", 'hex')
    * tx.sign(privatekey, hashBuffer)
    * @param {Buffer} hashBuffer
    * @param {Buffer} privateKey
    */
    sign(hashBuffer, privatekey){
        var sig = secp256k1.sign(hashBuffer, privatekey)
        var recidBuffer = Buffer.alloc(1).fill(sig.recovery)
        return Buffer.concat([sig.signature, recidBuffer], sig.signature.length + recidBuffer.length)
    }
}

module.exports = Transaction