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| import BigNumber from 'bignumber.js';
import * as ByteBuffer from 'bytebuffer';
import * as empty from 'is-empty';
import {api as sodium} from 'sodium';
import {bigNumberFromBuffer, bigNumberToBuffer} from '../utils/bignumber';
import {toSha256} from '../utils/sha256';
import {GenericWallet} from '../wallet';
export interface ITransaction<AssetType = {}> {
recipientId: string;
amount: number;
senderPublicKey: string;
requesterPublicKey: string;
timestamp: number;
fee: number;
asset: AssetType;
type: number;
id: string;
signature: string;
signSignature?: string;
}
/**
* Base transaction class.
*/
export abstract class BaseTx<T = {}> {
public recipientId: string;
public amount: number;
public senderPublicKey: string;
public requesterPublicKey: string = null;
public timestamp: number;
public fee: number;
protected abstract type: number;
// Transients
// tslint:disable variable-name
protected _signature: string;
protected _secondSignature?: string;
protected _id: string;
// tslint:enable variable-name
constructor(public asset?: T) {
}
/**
* Calculates bytes of tx.
* @param {boolean} skipSignature=false true if you don't want to account signature
* @param {boolean} skipSecondSign=false true if you don't want to account second signature
* @returns {Buffer}
*/
public getBytes(EskipSignature: boolean = false, EskipSecondSign: boolean = false): Buffer {
const childBytes = this.getChildBytes(skipSignature, skipSecondSign);
const assetSize = empty(childBytes) ? 0 : childBytes.length;
const bb = new ByteBuffer(1 + 4 + 32 + 32 + 8 + 8 + 64 + 64 + assetSize, true);
bb.writeByte(this.type);
bb.writeInt(this.timestamp);
BaseTx.hexKeyInByteBuffer(this.senderPublicKey, bb);
Iif (!empty(this.requesterPublicKey)) {
BaseTx.hexKeyInByteBuffer(this.requesterPublicKey, bb);
}
if (!empty(this.recipientId)) {
const recipient = bigNumberToBuffer(
new BigNumber(this.recipientId.slice(0, -1)),
{ size: 8 }
);
for (let i = 0; i < 8; i++) {
bb.writeByte(recipient[i] || 0);
}
} else {
for (let i = 0; i < 8; i++) {
bb.writeByte(0);
}
}
// tslint:disable-next-line no-string-literal
bb['writeLong'](this.amount);
if (assetSize > 0) {
for (let i = 0; i < assetSize; i++) {
bb.writeByte(childBytes[i]);
}
}
if (!skipSignature && !empty(this._signature)) {
BaseTx.hexKeyInByteBuffer(this._signature, bb);
}
if (!skipSecondSign && !empty(this._secondSignature)) {
BaseTx.hexKeyInByteBuffer(this._secondSignature, bb);
}
bb.flip();
// TODO: Check? this returns an array buffer which does not
// inherit from buffer (according to ts types).
return new Buffer(bb.toBuffer());
}
public sign(signingPrivKey: string | GenericWallet, signingSecondPrivKey?: string): ITransaction<T> {
let privKey: string;
let wallet: GenericWallet = null;
if (signingPrivKey instanceof GenericWallet) {
privKey = signingPrivKey.privKey;
wallet = signingPrivKey;
} else {
privKey = signingPrivKey;
}
if (empty(this.type) && this.type !== 0) {
throw new Error(`Unknown transaction type ${this.type}`);
}
if (empty(this.senderPublicKey)) {
if (wallet === null) {
throw new Error('Sender Public Key is empty');
}
this.senderPublicKey = wallet.publicKey;
}
if ((empty(this.timestamp) && this.timestamp !== 0 ) || this.timestamp < 0) {
throw new Error('Invalid timestamp provided');
}
Iif (empty(this.fee)) {
throw new Error('No fees specified');
}
this.innerCreate();
this._signature = this.createSignature(privKey).toString('hex');
if (!empty(signingSecondPrivKey)) {
this._secondSignature = this.createSignature(signingSecondPrivKey).toString('hex');
}
this._id = this.calcId();
return this.toObj();
}
/**
* Gets raw hash of current tx
*/
public getHash(): Buffer {
return toSha256(this.getBytes());
}
// chain style utilities.
public set(key: 'type' | 'fee' | 'amount' | 'timestamp', value: number): this;
public set(key: 'senderPublicKey' | 'recipientId' | 'requesterPublicKey', value: string): this;
public set(key: 'asset', value: T): this;
public set(key: string, value: any): this {
this[key] = value;
return this;
}
public withRecipientId(recipientId: string): this {
return this.set('recipientId', recipientId);
}
public withAmount(amount: number): this {
return this.set('amount', amount);
}
public withSenderPublicKey(senderPublicKey: string): this {
return this.set('senderPublicKey', senderPublicKey);
}
public withRequesterPublicKey(senderPublicKey: string): this {
return this.set('requesterPublicKey', senderPublicKey);
}
public withTimestamp(timestamp: number): this {
return this.set('timestamp', timestamp);
}
public withFees(fees: number): this {
return this.set('fee', fees);
}
/**
* Returns plain object representation of tx (if not signed error will be thrown)
*/
public toObj(): ITransaction<T> {
if (empty(this._signature)) {
throw new Error('Signature must be set before calling toObj');
}
if (empty(this._id)) {
this._id = this.calcId();
}
// tslint:disable object-literal-sort-keys
const toRet = {
id : this._id,
fee : this.fee,
type : this.type,
recipientId : this.recipientId,
amount : this.amount,
senderPublicKey : this.senderPublicKey,
requesterPublicKey: this.requesterPublicKey,
timestamp : this.timestamp,
signature : this._signature,
signSignature : this._secondSignature || undefined,
asset : this.asset,
};
// tslint:enable object-literal-sort-keys
if (empty(toRet.signSignature)) {
delete toRet.signSignature;
}
return toRet;
}
/**
* Generate signature from given private key.
* @param {string} privKey
* @returns {Buffer}
*/
protected createSignature(privKey: string) {
const hash = this.getHash();
return sodium.crypto_sign_detached(
hash,
new Buffer(privKey, 'hex'));
}
get signature() {
Iif (empty(this._signature)) {
throw new Error('Call create first');
}
return this._signature;
}
/**
* Set signature
* @param {string | Buffer} signature
*/
set signature(signature: string | Buffer) {
this._signature = (signature instanceof Buffer ? signature : new Buffer(signature, 'hex')).toString('hex');
if (this._signature.length !== 128) {
// Signature should have 64 bytes!
throw new Error('Signature is not having a correct lengthness');
}
}
get secondSignature() {
return this._secondSignature;
}
set secondSignature(signature: string | Buffer) {
if (empty(this._signature)) {
throw new Error('Did you set signature first? Most likely you did not calculated 2nd Signature on correct bytes');
}
this._secondSignature = (signature instanceof Buffer ? signature : new Buffer(signature, 'hex')).toString('hex');
if (this._secondSignature.length !== 128) {
// Signature should have 64 bytes!
throw new Error('Signature is not having a correct lengthness');
}
}
get id() {
if (empty(this._id)) {
throw new Error('Call create first');
}
return this._id;
}
/**
* Calculates Tx id!
* @returns {string}
*/
protected calcId(): string {
const hash = this.getHash();
const temp = new Buffer(8);
for (let i = 0; i < 8; i++) {
temp[i] = hash[7 - i];
}
return bigNumberFromBuffer(temp).toString();
}
/**
* Override to calculate asset bytes.
* @param {boolean} skipSignature
* @param {boolean} skipSecondSign
*/
protected abstract getChildBytes(skipSignature: boolean, skipSecondSign: boolean): Buffer;
/**
* override this to allow asset and other fields creations.
* for different tx types.
*/
// tslint:disable-next-line no-empty
protected innerCreate() {
}
/**
* Utility to copy an hex string to a bytebuffer
* @param {string} hex
* @param {ByteBuffer} bb
*/
// tslint:disable-next-line member-ordering
public static hexKeyInByteBuffer(hex: string, bb: ByteBuffer) {
const buf = Buffer.from(hex, 'hex');
// tslint:disable-next-line prefer-for-of
for (let i = 0; i < buf.length; i++) {
bb.writeByte(buf[i]);
}
}
}
|