feat(sdk-coin-vet): add delegate txn builder

modules/sdk-coin-vet/src/lib/constants.ts

@@ -1,10 +1,12 @@
 export const VET_TRANSACTION_ID_LENGTH = 64;
 export const VET_ADDRESS_LENGTH = 40;
 export const VET_BLOCK_ID_LENGTH = 64;
+export const ZERO_VALUE_AMOUNT = '0';
 
 export const TRANSFER_TOKEN_METHOD_ID = '0xa9059cbb';
 export const STAKING_METHOD_ID = '0xd8da3bbf';
 export const STAKE_CLAUSE_METHOD_ID = '0x604f2177';
+export const DELEGATE_CLAUSE_METHOD_ID = '0x3207555d';
 export const EXIT_DELEGATION_METHOD_ID = '0x69e79b7d';
 export const BURN_NFT_METHOD_ID = '0x2e17de78';
 export const TRANSFER_NFT_METHOD_ID = '0x23b872dd';

modules/sdk-coin-vet/src/lib/index.ts

@@ -9,6 +9,7 @@ export { FlushTokenTransaction } from './transaction/flushTokenTransaction';
 export { TokenTransaction } from './transaction/tokenTransaction';
 export { StakingTransaction } from './transaction/stakingTransaction';
 export { StakeClauseTransaction } from './transaction/stakeClauseTransaction';
+export { DelegateClauseTransaction } from './transaction/delegateClauseTransaction';
 export { ExitDelegationTransaction } from './transaction/exitDelegation';
 export { BurnNftTransaction } from './transaction/burnNftTransaction';
 export { ClaimRewardsTransaction } from './transaction/claimRewards';
@@ -19,6 +20,7 @@ export { AddressInitializationBuilder } from './transactionBuilder/addressInitia
 export { FlushTokenTransactionBuilder } from './transactionBuilder/flushTokenTransactionBuilder';
 export { StakingBuilder } from './transactionBuilder/stakingBuilder';
 export { StakeClauseTxnBuilder } from './transactionBuilder/stakeClauseTxnBuilder';
+export { DelegateTxnBuilder } from './transactionBuilder/delegateTxnBuilder';
 export { NFTTransactionBuilder } from './transactionBuilder/nftTransactionBuilder';
 export { BurnNftBuilder } from './transactionBuilder/burnNftBuilder';
 export { ExitDelegationBuilder } from './transactionBuilder/exitDelegationBuilder';

modules/sdk-coin-vet/src/lib/transaction/delegateClauseTransaction.ts

@@ -0,0 +1,177 @@
+import { TransactionType, InvalidTransactionError } from '@bitgo/sdk-core';
+import { BaseCoin as CoinConfig } from '@bitgo/statics';
+import { Transaction as VetTransaction, Secp256k1 } from '@vechain/sdk-core';
+import { Transaction } from './transaction';
+import { VetTransactionData } from '../iface';
+import EthereumAbi from 'ethereumjs-abi';
+import utils from '../utils';
+import BigNumber from 'bignumber.js';
+import { addHexPrefix } from 'ethereumjs-util';
+import { ZERO_VALUE_AMOUNT } from '../constants';
+
+export class DelegateClauseTransaction extends Transaction {
+  private _stakingContractAddress: string;
+  private _tokenId: number;
+  private _delegateForever = true;
+
+  constructor(_coinConfig: Readonly<CoinConfig>) {
+    super(_coinConfig);
+    this._type = TransactionType.StakingDelegate;
+  }
+
+  get stakingContractAddress(): string {
+    return this._stakingContractAddress;
+  }
+
+  set stakingContractAddress(address: string) {
+    this._stakingContractAddress = address;
+  }
+
+  get tokenId(): number {
+    return this._tokenId;
+  }
+
+  set tokenId(tokenId: number) {
+    this._tokenId = tokenId;
+  }
+
+  get delegateForever(): boolean {
+    return this._delegateForever;
+  }
+
+  set delegateForever(delegateForever: boolean) {
+    this._delegateForever = delegateForever;
+  }
+
+  buildClauses(): void {
+    if (!this.stakingContractAddress) {
+      throw new Error('Staking contract address is not set');
+    }
+
+    utils.validateDelegationContractAddress(this.stakingContractAddress, this._coinConfig);
+
+    if (this.tokenId === undefined || this.tokenId === null) {
+      throw new Error('Token ID is not set');
+    }
+
+    const data = this.getDelegateData(this.tokenId, this.delegateForever);
+    this._transactionData = data;
+
+    // Create the clause for delegation
+    this._clauses = [
+      {
+        to: this.stakingContractAddress,
+        value: ZERO_VALUE_AMOUNT,
+        data: this._transactionData,
+      },
+    ];
+
+    // Set recipients based on the clauses
+    this._recipients = [
+      {
+        address: this.stakingContractAddress,
+        amount: ZERO_VALUE_AMOUNT,
+      },
+    ];
+  }
+  /**
+   * Encodes delegation transaction data using ethereumjs-abi for delegate method
+   *
+   * @param {number} tokenId - The Token ID for delegation
+   * @returns {string} - The encoded transaction data
+   */
+  getDelegateData(levelId: number, delegateForever = true): string {
+    const methodName = 'delegate';
+    const types = ['uint256', 'bool'];
+    const params = [levelId, delegateForever];
+
+    const method = EthereumAbi.methodID(methodName, types);
+    const args = EthereumAbi.rawEncode(types, params);
+
+    return addHexPrefix(Buffer.concat([method, args]).toString('hex'));
+  }
+
+  toJson(): VetTransactionData {
+    const json: VetTransactionData = {
+      id: this.id,
+      chainTag: this.chainTag,
+      blockRef: this.blockRef,
+      expiration: this.expiration,
+      gasPriceCoef: this.gasPriceCoef,
+      gas: this.gas,
+      dependsOn: this.dependsOn,
+      nonce: this.nonce,
+      data: this.transactionData,
+      value: ZERO_VALUE_AMOUNT,
+      sender: this.sender,
+      to: this.stakingContractAddress,
+      stakingContractAddress: this.stakingContractAddress,
+      amountToStake: ZERO_VALUE_AMOUNT,
+      nftTokenId: this.tokenId,
+      autorenew: this.delegateForever,
+    };
+
+    return json;
+  }
+
+  fromDeserializedSignedTransaction(signedTx: VetTransaction): void {
+    try {
+      if (!signedTx || !signedTx.body) {
+        throw new InvalidTransactionError('Invalid transaction: missing transaction body');
+      }
+
+      // Store the raw transaction
+      this.rawTransaction = signedTx;
+
+      // Set transaction body properties
+      const body = signedTx.body;
+      this.chainTag = typeof body.chainTag === 'number' ? body.chainTag : 0;
+      this.blockRef = body.blockRef || '0x0';
+      this.expiration = typeof body.expiration === 'number' ? body.expiration : 64;
+      this.clauses = body.clauses || [];
+      this.gasPriceCoef = typeof body.gasPriceCoef === 'number' ? body.gasPriceCoef : 128;
+      this.gas = typeof body.gas === 'number' ? body.gas : Number(body.gas) || 0;
+      this.dependsOn = body.dependsOn || null;
+      this.nonce = String(body.nonce);
+
+      // Set delegation-specific properties
+      if (body.clauses.length > 0) {
+        const clause = body.clauses[0];
+        if (clause.to) {
+          this.stakingContractAddress = clause.to;
+        }
+        if (clause.data) {
+          this.transactionData = clause.data;
+          const decoded = utils.decodeDelegateClauseData(clause.data);
+          this.tokenId = decoded.tokenId;
+          this.delegateForever = decoded.delegateForever;
+        }
+      }
+
+      // Set recipients from clauses
+      this.recipients = body.clauses.map((clause) => ({
+        address: (clause.to || '0x0').toString().toLowerCase(),
+        amount: new BigNumber(clause.value || 0).toString(),
+      }));
+      this.loadInputsAndOutputs();
+
+      // Set sender address
+      if (signedTx.signature && signedTx.origin) {
+        this.sender = signedTx.origin.toString().toLowerCase();
+      }
+
+      // Set signatures if present
+      if (signedTx.signature) {
+        // First signature is sender's signature
+        this.senderSignature = Buffer.from(signedTx.signature.slice(0, Secp256k1.SIGNATURE_LENGTH));
+
+        // If there's additional signature data, it's the fee payer's signature
+        if (signedTx.signature.length > Secp256k1.SIGNATURE_LENGTH) {
+          this.feePayerSignature = Buffer.from(signedTx.signature.slice(Secp256k1.SIGNATURE_LENGTH));
+        }
+      }
+    } catch (e) {
+      throw new InvalidTransactionError(`Failed to deserialize transaction: ${e.message}`);
+    }
+  }
+}

modules/sdk-coin-vet/src/lib/transaction/transaction.ts

@@ -390,6 +390,7 @@ export class Transaction extends BaseTransaction {
       this.type === TransactionType.SendNFT ||
       this.type === TransactionType.ContractCall ||
       this.type === TransactionType.StakingActivate ||
+      this.type === TransactionType.StakingDelegate ||
       this.type === TransactionType.StakingUnlock ||
       this.type === TransactionType.StakingWithdraw ||
       this.type === TransactionType.StakingClaim

modules/sdk-coin-vet/src/lib/transactionBuilder/delegateTxnBuilder.ts

@@ -0,0 +1,128 @@
+import assert from 'assert';
+import { BaseCoin as CoinConfig } from '@bitgo/statics';
+import { TransactionType } from '@bitgo/sdk-core';
+import { TransactionClause } from '@vechain/sdk-core';
+
+import { TransactionBuilder } from './transactionBuilder';
+import { Transaction } from '../transaction/transaction';
+import { DelegateClauseTransaction } from '../transaction/delegateClauseTransaction';
+import utils from '../utils';
+
+export class DelegateTxnBuilder extends TransactionBuilder {
+  /**
+   * Creates a new Delegate Clause txn instance.
+   *
+   * @param {Readonly<CoinConfig>} _coinConfig - The coin configuration object
+   */
+  constructor(_coinConfig: Readonly<CoinConfig>) {
+    super(_coinConfig);
+    this._transaction = new DelegateClauseTransaction(_coinConfig);
+  }
+
+  /**
+   * Initializes the builder with an existing Delegate txn.
+   *
+   * @param {DelegateClauseTransaction} tx - The transaction to initialize the builder with
+   */
+  initBuilder(tx: DelegateClauseTransaction): void {
+    this._transaction = tx;
+  }
+
+  /**
+   * Gets the staking transaction instance.
+   *
+   * @returns {DelegateClauseTransaction} The delegate transaction
+   */
+  get delegateTransaction(): DelegateClauseTransaction {
+    return this._transaction as DelegateClauseTransaction;
+  }
+
+  /**
+   * Gets the transaction type for delegate.
+   *
+   * @returns {TransactionType} The transaction type
+   */
+  protected get transactionType(): TransactionType {
+    return TransactionType.StakingDelegate;
+  }
+
+  /**
+   * Validates the transaction clauses for delegate transaction.
+   * @param {TransactionClause[]} clauses - The transaction clauses to validate.
+   * @returns {boolean} - Returns true if the clauses are valid, false otherwise.
+   */
+  protected isValidTransactionClauses(clauses: TransactionClause[]): boolean {
+    try {
+      if (!clauses || !Array.isArray(clauses) || clauses.length === 0) {
+        return false;
+      }
+
+      const clause = clauses[0];
+      if (!clause.to || !utils.isValidAddress(clause.to)) {
+        return false;
+      }
+
+      return true;
+    } catch (e) {
+      return false;
+    }
+  }
+
+  /**
+   * Sets the staking contract address for this delegate tx.
+   * The address must be explicitly provided to ensure the correct contract is used.
+   *
+   * @param {string} address - The staking contract address (required)
+   * @returns {DelegateTxnBuilder} This transaction builder
+   * @throws {Error} If no address is provided
+   */
+  stakingContractAddress(address: string): this {
+    if (!address) {
+      throw new Error('Staking contract address is required');
+    }
+    this.validateAddress({ address });
+    this.delegateTransaction.stakingContractAddress = address;
+    return this;
+  }
+
+  /**
+   * Sets the token ID for this delegate tx.
+   *
+   * @param {number} levelId - The level ID for staking
+   * @returns {DelegateTxnBuilder} This transaction builder
+   */
+  tokenId(tokenId: number): this {
+    this.delegateTransaction.tokenId = tokenId;
+    return this;
+  }
+
+  /**
+   * Sets the transaction data for this delegate tx.
+   *
+   * @param {string} data - The transaction data
+   * @returns {DelegateTxnBuilder} This transaction builder
+   */
+  transactionData(data: string): this {
+    this.delegateTransaction.transactionData = data;
+    return this;
+  }
+
+  /** @inheritdoc */
+  validateTransaction(transaction?: DelegateClauseTransaction): void {
+    if (!transaction) {
+      throw new Error('transaction not defined');
+    }
+    assert(transaction.stakingContractAddress, 'Staking contract address is required');
+
+    assert(transaction.tokenId, 'Token ID is required');
+    assert(transaction.delegateForever, 'delegate forever flag is required');
+    this.validateAddress({ address: transaction.stakingContractAddress });
+  }
+
+  /** @inheritdoc */
+  protected async buildImplementation(): Promise<Transaction> {
+    this.transaction.type = this.transactionType;
+    await this.delegateTransaction.build();
+    return this.transaction;
+  }
+}

modules/sdk-coin-vet/src/lib/transactionBuilderFactory.ts

@@ -23,6 +23,8 @@ import { NFTTransactionBuilder } from './transactionBuilder/nftTransactionBuilde
 import { NFTTransaction } from './transaction/nftTransaction';
 import { StakeClauseTransaction } from './transaction/stakeClauseTransaction';
 import { StakeClauseTxnBuilder } from './transactionBuilder/stakeClauseTxnBuilder';
+import { DelegateTxnBuilder } from './transactionBuilder/delegateTxnBuilder';
+import { DelegateClauseTransaction } from './transaction/delegateClauseTransaction';
 
 export class TransactionBuilderFactory extends BaseTransactionBuilderFactory {
   constructor(_coinConfig: Readonly<CoinConfig>) {
@@ -63,6 +65,10 @@ export class TransactionBuilderFactory extends BaseTransactionBuilderFactory {
           const stakeClauseTx = new StakeClauseTransaction(this._coinConfig);
           stakeClauseTx.fromDeserializedSignedTransaction(signedTx);
           return this.getStakingActivateBuilder(stakeClauseTx);
+        case TransactionType.StakingDelegate:
+          const delegateClauseTx = new DelegateClauseTransaction(this._coinConfig);
+          delegateClauseTx.fromDeserializedSignedTransaction(signedTx);
+          return this.getStakingDelegateBuilder(delegateClauseTx);
         case TransactionType.StakingUnlock:
           const exitDelegationTx = new ExitDelegationTransaction(this._coinConfig);
           exitDelegationTx.fromDeserializedSignedTransaction(signedTx);
@@ -104,6 +110,10 @@ export class TransactionBuilderFactory extends BaseTransactionBuilderFactory {
     return this.initializeBuilder(tx, new StakingBuilder(this._coinConfig));
   }
 
+  getStakingDelegateBuilder(tx?: DelegateClauseTransaction): DelegateTxnBuilder {
+    return this.initializeBuilder(tx, new DelegateTxnBuilder(this._coinConfig));
+  }
+
   getStakingActivateBuilder(tx?: StakeClauseTransaction): StakeClauseTxnBuilder {
     return this.initializeBuilder(tx, new StakeClauseTxnBuilder(this._coinConfig));
   }