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Текущая директория: /opt/BitGoJS/node_modules/algosdk/dist/esm/src
Просмотр файла: group.js
import * as txnBuilder from './transaction';
import * as nacl from './nacl/naclWrappers';
import * as encoding from './encoding/encoding';
import * as address from './encoding/address';
import * as utils from './utils/utils';
const ALGORAND_MAX_TX_GROUP_SIZE = 16;
/**
* Aux class for group id calculation of a group of transactions
*/
export class TxGroup {
constructor(hashes) {
this.name = 'Transaction group';
this.tag = Buffer.from('TG');
if (hashes.length > ALGORAND_MAX_TX_GROUP_SIZE) {
const errorMsg = `${hashes.length.toString()} transactions grouped together but max group size is ${ALGORAND_MAX_TX_GROUP_SIZE.toString()}`;
throw Error(errorMsg);
}
this.txGroupHashes = hashes;
}
// eslint-disable-next-line camelcase
get_obj_for_encoding() {
const txgroup = {
txlist: this.txGroupHashes,
};
return txgroup;
}
// eslint-disable-next-line camelcase
static from_obj_for_encoding(txgroupForEnc) {
const txn = Object.create(this.prototype);
txn.name = 'Transaction group';
txn.tag = Buffer.from('TG');
txn.txGroupHashes = [];
for (const hash of txgroupForEnc.txlist) {
txn.txGroupHashes.push(Buffer.from(hash));
}
return txn;
}
toByte() {
return encoding.encode(this.get_obj_for_encoding());
}
}
/**
* computeGroupID returns group ID for a group of transactions
* @param txns - array of transactions (every element is a dict or Transaction)
* @returns Buffer
*/
export function computeGroupID(txns) {
const hashes = [];
for (const txn of txns) {
const tx = txnBuilder.instantiateTxnIfNeeded(txn);
hashes.push(tx.rawTxID());
}
const txgroup = new TxGroup(hashes);
const bytes = txgroup.toByte();
const toBeHashed = Buffer.from(utils.concatArrays(txgroup.tag, bytes));
const gid = nacl.genericHash(toBeHashed);
return Buffer.from(gid);
}
/**
* assignGroupID assigns group id to a given list of unsigned transactions
* @param txns - array of transactions (every element is a dict or Transaction)
* @param from - optional sender address specifying which transaction return
* @returns possible list of matching transactions
*/
export function assignGroupID(txns, from) {
const gid = computeGroupID(txns);
const result = [];
for (const txn of txns) {
const tx = txnBuilder.instantiateTxnIfNeeded(txn);
if (!from || address.encodeAddress(tx.from.publicKey) === from) {
tx.group = gid;
result.push(tx);
}
}
return result;
}
export default TxGroup;
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