1 files changed, 37 insertions, 0 deletions
diff --git a/src/contract_wrappers/exchange_wrapper.ts b/src/contract_wrappers/exchange_wrapper.ts
new file mode 100644
index 000000000..38043dd55
--- /dev/null
+++ b/src/contract_wrappers/exchange_wrapper.ts
@@ -0,0 +1,37 @@
+import * as _ from 'lodash';
+import {Web3Wrapper} from '../web3_wrapper';
+import {ECSignature, ZeroExError, ExchangeContract} from '../types';
+import {assert} from '../utils/assert';
+import {ContractWrapper} from './contract_wrapper';
+import * as ExchangeArtifacts from '../../artifacts/Exchange.json';
+import {ECSignatureSchema} from '../schemas/ec_signature_schema';
+
+export class ExchangeWrapper extends ContractWrapper {
+    constructor(web3Wrapper: Web3Wrapper) {
+        super(web3Wrapper);
+    }
+    public async isValidSignatureAsync(dataHex: string, ecSignature: ECSignature,
+                                       signerAddressHex: string): Promise<boolean> {
+        assert.isHexString('dataHex', dataHex);
+        assert.doesConformToSchema('ecSignature', ecSignature, ECSignatureSchema);
+        assert.isETHAddressHex('signerAddressHex', signerAddressHex);
+
+        const senderAddressIfExists = await this.web3Wrapper.getSenderAddressIfExistsAsync();
+        assert.assert(!_.isUndefined(senderAddressIfExists), ZeroExError.USER_HAS_NO_ASSOCIATED_ADDRESSES);
+
+        const contractInstance = await this.instantiateContractIfExistsAsync((ExchangeArtifacts as any));
+        const exchangeInstance = contractInstance as ExchangeContract;
+
+        const isValidSignature = await exchangeInstance.isValidSignature.call(
+            signerAddressHex,
+            dataHex,
+            ecSignature.v,
+            ecSignature.r,
+            ecSignature.s,
+            {
+                from: senderAddressIfExists,
+            },
+        );
+        return isValidSignature;
+    }
+}