feat: add get asset config to sdk (#70)

packages/sdk/src/core/contracts.service.ts

@@ -13,6 +13,7 @@ import {
 } from "viem";
 import { Withdrawal, WithdrawalProof } from "../types/withdrawal.js";
 import {
+  AssetConfig,
   ContractInteractions,
   TransactionResponse,
 } from "../interfaces/contracts.interface.js";
@@ -283,6 +284,40 @@ export class ContractInteractionsService implements ContractInteractions {
     return BigInt(stateSize as string);
   }
 
+
+  /**
+   * Retrieves data from the corresponding asset
+   *
+   * @param assetAddress - The asset contract address.
+   * @returns AssetConfig - An object containing the privacy pool address, minimum deposit amount, vetting fee and maximum relaying fee.
+   * @throws ContractError if the asset does not exist in the pool.
+   */
+  async getAssetConfig(assetAddress: Address): Promise<AssetConfig> {
+    const assetConfig = await this.publicClient.readContract({
+      address: this.entrypointAddress,
+      abi: IEntrypointABI as Abi,
+      account: this.account,
+      args: [assetAddress],
+      functionName: "assetConfig",
+    });
+    const [pool, minimumDepositAmount, vettingFeeBPS, maxRelayFeeBPS] = assetConfig as [string, bigint, bigint, bigint];
+
+    // if no pool throw error
+    if (
+      !pool ||
+      pool === "0x0000000000000000000000000000000000000000"
+    ) {
+      throw ContractError.assetNotFound(assetAddress);
+    }
+
+    return {
+      pool: getAddress(pool),
+      minimumDepositAmount,
+      vettingFeeBPS,
+      maxRelayFeeBPS
+    }
+  }
+
   /**
    * Retrieves data about a specific scope, including the associated privacy pool
    * and the asset used in that pool.

packages/sdk/src/errors/base.error.ts

@@ -117,4 +117,9 @@ export class ContractError extends SDKError {
   public static scopeNotFound(scope: bigint): ContractError {
     return new ContractError(`No pool found for scope ${scope.toString()}`, ErrorCode.CONTRACT_ERROR);
   }
+
+  public static assetNotFound(address: string): ContractError {
+    return new ContractError(`Asset ${address} has no pool`, ErrorCode.CONTRACT_ERROR);
+  }
+
 }

packages/sdk/src/interfaces/contracts.interface.ts

@@ -9,6 +9,13 @@ export interface SolidityGroth16Proof {
   pubSignals: bigint[];
 }
 
+export interface AssetConfig {
+  pool: Address,
+  minimumDepositAmount: bigint,
+  vettingFeeBPS: bigint,
+  maxRelayFeeBPS: bigint
+}
+
 export interface TransactionResponse {
   hash: string;
   wait: () => Promise<void>;
@@ -46,6 +53,7 @@ export interface ContractInteractions {
   getScope(privacyPoolAddress: Address): Promise<bigint>;
   getStateRoot(privacyPoolAddress: Address): Promise<bigint>;
   getStateSize(privacyPoolAddress: Address): Promise<bigint>;
+  getAssetConfig(assetAddress: Address): Promise<AssetConfig>;
   getScopeData(
     scope: bigint,
   ): Promise<{ poolAddress: Address | null; assetAddress: Address | null }>;