feat(1636): New command- allowance for fungible token

Signed-off-by: matevszm <mateusz.marcinkowski@blockydevs.com>

Author: matevszm

src/core/services/token/token-service.interface.ts

@@ -3,13 +3,15 @@
  * All token services must implement this interface
  */
 import type {
+  AccountAllowanceApproveTransaction,
   TokenAssociateTransaction,
   TokenCreateTransaction,
   TokenMintTransaction,
   TransferTransaction,
 } from '@hashgraph/sdk';
 import type {
   NftTransferParams,
+  TokenAllowanceFtParams,
   TokenAssociationParams,
   TokenCreateParams,
   TokenMintParams,
@@ -44,4 +46,8 @@ export interface TokenService {
    * Create an NFT transfer transaction (without execution)
    */
   createNftTransferTransaction(params: NftTransferParams): TransferTransaction;
+
+  createFungibleTokenAllowanceTransaction(
+    params: TokenAllowanceFtParams,
+  ): AccountAllowanceApproveTransaction;
 }

src/core/services/token/token-service.ts

@@ -7,6 +7,7 @@ import type { Logger } from '@/core/services/logger/logger-service.interface';
 import type {
   CustomFee as CustomFeeParams,
   NftTransferParams,
+  TokenAllowanceFtParams,
   TokenAssociationParams,
   TokenCreateParams,
   TokenMintParams,
@@ -15,6 +16,7 @@ import type {
 import type { TokenService } from './token-service.interface';
 
 import {
+  AccountAllowanceApproveTransaction,
   AccountId,
   CustomFixedFee,
   CustomFractionalFee,
@@ -267,6 +269,21 @@ export class TokenServiceImpl implements TokenService {
     return transferTx;
   }
 
+  createFungibleTokenAllowanceTransaction(
+    params: TokenAllowanceFtParams,
+  ): AccountAllowanceApproveTransaction {
+    const { tokenId, ownerAccountId, spenderAccountId, amount } = params;
+    this.logger.debug(
+      `[TOKEN SERVICE] Creating FT allowance: ${amount.toString()} tokens of ${tokenId} from ${ownerAccountId} to spender ${spenderAccountId}`,
+    );
+    return new AccountAllowanceApproveTransaction().approveTokenAllowance(
+      TokenId.fromString(tokenId),
+      AccountId.fromString(ownerAccountId),
+      AccountId.fromString(spenderAccountId),
+      amount,
+    );
+  }
+
   /**
    * Process custom fees and convert them to Hedera CustomFee objects
    */

src/core/types/token.types.ts

@@ -101,3 +101,10 @@ export interface NftTransferParams {
   toAccountId: string;
   serialNumbers: number[];
 }
+
+export interface TokenAllowanceFtParams {
+  tokenId: string;
+  ownerAccountId: string;
+  spenderAccountId: string;
+  amount: bigint;
+}