1 files changed, 20 insertions, 0 deletions
diff --git a/packages/contracts/src/utils/simple_erc20_balance_and_allowance_fetcher.ts b/packages/contracts/src/utils/simple_erc20_balance_and_allowance_fetcher.ts
new file mode 100644
index 000000000..6eed9227a
--- /dev/null
+++ b/packages/contracts/src/utils/simple_erc20_balance_and_allowance_fetcher.ts
@@ -0,0 +1,20 @@
+import { AbstractBalanceAndProxyAllowanceFetcher } from '@0xproject/order-utils';
+import { BigNumber } from '@0xproject/utils';
+
+import { ERC20Wrapper } from './erc20_wrapper';
+
+// TODO(fabio): Refactor this to also work for ERC721!
+export class SimpleERC20BalanceAndProxyAllowanceFetcher implements AbstractBalanceAndProxyAllowanceFetcher {
+    private _erc20TokenWrapper: ERC20Wrapper;
+    constructor(erc20TokenWrapper: ERC20Wrapper) {
+        this._erc20TokenWrapper = erc20TokenWrapper;
+    }
+    public async getBalanceAsync(tokenAddress: string, userAddress: string): Promise<BigNumber> {
+        const balance = await this._erc20TokenWrapper.getBalanceAsync(userAddress, tokenAddress);
+        return balance;
+    }
+    public async getProxyAllowanceAsync(tokenAddress: string, userAddress: string): Promise<BigNumber> {
+        const proxyAllowance = await this._erc20TokenWrapper.getProxyAllowanceAsync(userAddress, tokenAddress);
+        return proxyAllowance;
+    }
+}