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-rw-r--r--src/0x.js.ts3
-rw-r--r--src/contract_wrappers/erc20_wrapper.ts28
-rw-r--r--src/types.ts6
3 files changed, 37 insertions, 0 deletions
diff --git a/src/0x.js.ts b/src/0x.js.ts
index 7e48bc0a5..7932559fb 100644
--- a/src/0x.js.ts
+++ b/src/0x.js.ts
@@ -13,6 +13,7 @@ import compareVersions = require('compare-versions');
import {ExchangeWrapper} from './contract_wrappers/exchange_wrapper';
import {TokenRegistryWrapper} from './contract_wrappers/token_registry_wrapper';
import {ecSignatureSchema} from './schemas/ec_signature_schema';
+import {ERC20Wrapper} from './contract_wrappers/erc20_wrapper';
import {SolidityTypes, ECSignature, ZeroExError} from './types';
const MAX_DIGITS_IN_UNSIGNED_256_INT = 78;
@@ -21,6 +22,7 @@ export class ZeroEx {
public web3Wrapper: Web3Wrapper;
public exchange: ExchangeWrapper;
public tokenRegistry: TokenRegistryWrapper;
+ public erc20: ERC20Wrapper;
/**
* Computes the orderHash given the order parameters and returns it as a hex encoded string.
*/
@@ -135,6 +137,7 @@ export class ZeroEx {
this.web3Wrapper = new Web3Wrapper(web3);
this.exchange = new ExchangeWrapper(this.web3Wrapper);
this.tokenRegistry = new TokenRegistryWrapper(this.web3Wrapper);
+ this.erc20 = new ERC20Wrapper(this.web3Wrapper);
}
/**
* Signs an orderHash and returns it's elliptic curve signature
diff --git a/src/contract_wrappers/erc20_wrapper.ts b/src/contract_wrappers/erc20_wrapper.ts
new file mode 100644
index 000000000..60b1887db
--- /dev/null
+++ b/src/contract_wrappers/erc20_wrapper.ts
@@ -0,0 +1,28 @@
+import * as _ from 'lodash';
+import * as BigNumber from 'bignumber.js';
+import {Web3Wrapper} from '../web3_wrapper';
+import {assert} from '../utils/assert';
+import {ContractWrapper} from './contract_wrapper';
+import * as TokenArtifacts from '../artifacts/Token.json';
+import {ERC20Contract} from '../types';
+
+export class ERC20Wrapper extends ContractWrapper {
+ constructor(web3Wrapper: Web3Wrapper) {
+ super(web3Wrapper);
+ }
+ /**
+ * Returns an owner's ERC20 token balance
+ */
+ public async getBalanceAsync(tokenAddress: string, ownerAddress: string): Promise<BigNumber.BigNumber> {
+ assert.isETHAddressHex('ownerAddress', ownerAddress);
+ assert.isETHAddressHex('tokenAddress', tokenAddress);
+
+ const contractInstance = await this.instantiateContractIfExistsAsync((TokenArtifacts as any), tokenAddress);
+ const tokenContract = contractInstance as ERC20Contract;
+ let balance = await tokenContract.balanceOf.call(ownerAddress);
+ // The BigNumber instance returned by Web3 is of a much older version then our own, we therefore
+ // should always re-instantiate the returned BigNumber after retrieval.
+ balance = _.isUndefined(balance) ? new BigNumber(0) : new BigNumber(balance);
+ return balance;
+ }
+}
diff --git a/src/types.ts b/src/types.ts
index 273389480..f5b0f3e7c 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -30,6 +30,12 @@ export interface ExchangeContract {
isValidSignature: any;
}
+export interface ERC20Contract {
+ balanceOf: {
+ call: (address: string) => Promise<BigNumber.BigNumber>;
+ };
+}
+
export interface TokenRegistryContract {
getTokenMetaData: any;
getTokenAddresses: any;