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import { ERC20ProxyContract } from '@0xproject/abi-gen-wrappers';
import { ERC20Proxy } from '@0xproject/contract-artifacts';
import { AssetProxyId } from '@0xproject/types';
import { Web3Wrapper } from '@0xproject/web3-wrapper';
import { ContractAbi } from 'ethereum-types';
import * as _ from 'lodash';
import { assert } from '../utils/assert';
import { ContractWrapper } from './contract_wrapper';
/**
* This class includes the functionality related to interacting with the ERC20Proxy contract.
*/
export class ERC20ProxyWrapper extends ContractWrapper {
public abi: ContractAbi = ERC20Proxy.compilerOutput.abi;
public address: string;
private _erc20ProxyContractIfExists?: ERC20ProxyContract;
/**
* Instantiate ERC20ProxyWrapper
* @param web3Wrapper Web3Wrapper instance to use
* @param networkId Desired networkId
* @param address The address of the ERC20Proxy contract. If undefined, will
* default to the known address corresponding to the networkId.
*/
constructor(web3Wrapper: Web3Wrapper, networkId: number, address?: string) {
super(web3Wrapper, networkId);
this.address = _.isUndefined(address) ? this._getDefaultContractAddresses().erc20Proxy : address;
}
/**
* Get the 4 bytes ID of this asset proxy
* @return Proxy id
*/
public async getProxyIdAsync(): Promise<AssetProxyId> {
const ERC20ProxyContractInstance = this._getERC20ProxyContract();
const proxyId = (await ERC20ProxyContractInstance.getProxyId.callAsync()) as AssetProxyId;
return proxyId;
}
/**
* Check if the Exchange contract address is authorized by the ERC20Proxy contract.
* @param exchangeContractAddress The hex encoded address of the Exchange contract to call.
* @return Whether the exchangeContractAddress is authorized.
*/
public async isAuthorizedAsync(exchangeContractAddress: string): Promise<boolean> {
assert.isETHAddressHex('exchangeContractAddress', exchangeContractAddress);
const normalizedExchangeContractAddress = exchangeContractAddress.toLowerCase();
const ERC20ProxyContractInstance = this._getERC20ProxyContract();
const isAuthorized = await ERC20ProxyContractInstance.authorized.callAsync(normalizedExchangeContractAddress);
return isAuthorized;
}
/**
* Get the list of all Exchange contract addresses authorized by the ERC20Proxy contract.
* @return The list of authorized addresses.
*/
public async getAuthorizedAddressesAsync(): Promise<string[]> {
const ERC20ProxyContractInstance = this._getERC20ProxyContract();
const authorizedAddresses = await ERC20ProxyContractInstance.getAuthorizedAddresses.callAsync();
return authorizedAddresses;
}
// HACK: We don't want this method to be visible to the other units within that package but not to the end user.
// TS doesn't give that possibility and therefore we make it private and access it over an any cast. Because of that tslint sees it as unused.
// tslint:disable-next-line:no-unused-variable
private _invalidateContractInstance(): void {
delete this._erc20ProxyContractIfExists;
}
private _getERC20ProxyContract(): ERC20ProxyContract {
if (!_.isUndefined(this._erc20ProxyContractIfExists)) {
return this._erc20ProxyContractIfExists;
}
const contractInstance = new ERC20ProxyContract(
this.abi,
this.address,
this._web3Wrapper.getProvider(),
this._web3Wrapper.getContractDefaults(),
);
this._erc20ProxyContractIfExists = contractInstance;
return this._erc20ProxyContractIfExists;
}
}
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