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// tslint:disable:no-unnecessary-type-assertion
import { BlockParamLiteral, ERC20TokenWrapper, ERC721TokenWrapper } from '@0xproject/contract-wrappers';
import { AbstractBalanceAndProxyAllowanceFetcher, assetDataUtils } from '@0xproject/order-utils';
import { AssetProxyId, ERC20AssetData, ERC721AssetData } from '@0xproject/types';
import { BigNumber } from '@0xproject/utils';
export class AssetBalanceAndProxyAllowanceFetcher implements AbstractBalanceAndProxyAllowanceFetcher {
private readonly _erc20Token: ERC20TokenWrapper;
private readonly _erc721Token: ERC721TokenWrapper;
private readonly _stateLayer: BlockParamLiteral;
constructor(erc20Token: ERC20TokenWrapper, erc721Token: ERC721TokenWrapper, stateLayer: BlockParamLiteral) {
this._erc20Token = erc20Token;
this._erc721Token = erc721Token;
this._stateLayer = stateLayer;
}
public async getBalanceAsync(assetData: string, userAddress: string): Promise<BigNumber> {
const decodedAssetData = assetDataUtils.decodeAssetDataOrThrow(assetData);
if (decodedAssetData.assetProxyId === AssetProxyId.ERC20) {
const decodedERC20AssetData = decodedAssetData as ERC20AssetData;
const balance = await this._erc20Token.getBalanceAsync(decodedERC20AssetData.tokenAddress, userAddress, {
defaultBlock: this._stateLayer,
});
return balance;
} else {
const decodedERC721AssetData = decodedAssetData as ERC721AssetData;
const tokenOwner = await this._erc721Token.getOwnerOfAsync(
decodedERC721AssetData.tokenAddress,
decodedERC721AssetData.tokenId,
{
defaultBlock: this._stateLayer,
},
);
const balance = tokenOwner === userAddress ? new BigNumber(1) : new BigNumber(0);
return balance;
}
}
public async getProxyAllowanceAsync(assetData: string, userAddress: string): Promise<BigNumber> {
const decodedAssetData = assetDataUtils.decodeAssetDataOrThrow(assetData);
if (decodedAssetData.assetProxyId === AssetProxyId.ERC20) {
const decodedERC20AssetData = decodedAssetData as ERC20AssetData;
const proxyAllowance = await this._erc20Token.getProxyAllowanceAsync(
decodedERC20AssetData.tokenAddress,
userAddress,
{
defaultBlock: this._stateLayer,
},
);
return proxyAllowance;
} else {
const decodedERC721AssetData = decodedAssetData as ERC721AssetData;
const isApprovedForAll = await this._erc721Token.isProxyApprovedForAllAsync(
decodedERC721AssetData.tokenAddress,
userAddress,
{
defaultBlock: this._stateLayer,
},
);
if (isApprovedForAll) {
return new BigNumber(this._erc20Token.UNLIMITED_ALLOWANCE_IN_BASE_UNITS);
} else {
const isApproved = await this._erc721Token.isProxyApprovedAsync(
decodedERC721AssetData.tokenAddress,
decodedERC721AssetData.tokenId,
{
defaultBlock: this._stateLayer,
},
);
const proxyAllowance = isApproved ? new BigNumber(1) : new BigNumber(0);
return proxyAllowance;
}
}
}
}
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