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address-based.ts
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address-based.ts
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import {
AdvancedLogicTypes,
ExtensionTypes,
PaymentTypes,
RequestLogicTypes,
} from '@requestnetwork/types';
import getBalanceErrorObject from '../balance-error';
import Erc20InfoRetriever from './address-based-info-retriever';
const bigNumber: any = require('bn.js');
const supportedNetworks = ['mainnet', 'rinkeby', 'private'];
/**
* Handle payment networks with ERC20 based address extension
*/
export default class PaymentNetworkERC20AddressBased
implements PaymentTypes.IPaymentNetwork<PaymentTypes.IERC20PaymentEventParameters> {
private extension: ExtensionTypes.PnAddressBased.IAddressBased;
/**
* @param extension The advanced logic payment network extensions
*/
public constructor({ advancedLogic }: { advancedLogic: AdvancedLogicTypes.IAdvancedLogic }) {
this.extension = advancedLogic.extensions.addressBasedErc20;
}
/**
* Creates the extensions data for the creation of this extension
*
* @param paymentNetworkCreationParameters Parameters to create the extension
* @returns The extensionData object
*/
public async createExtensionsDataForCreation(
paymentNetworkCreationParameters: ExtensionTypes.PnAddressBased.ICreationParameters,
): Promise<ExtensionTypes.IAction> {
return this.extension.createCreationAction({
paymentAddress: paymentNetworkCreationParameters.paymentAddress,
refundAddress: paymentNetworkCreationParameters.refundAddress,
});
}
/**
* Creates the extensions data to add payment address
*
* @param parameters to add payment information
* @returns The extensionData object
*/
public createExtensionsDataForAddPaymentInformation(
parameters: ExtensionTypes.PnAddressBased.IAddPaymentAddressParameters,
): ExtensionTypes.IAction {
return this.extension.createAddPaymentAddressAction({
paymentAddress: parameters.paymentAddress,
});
}
/**
* Creates the extensions data to add refund address
*
* @param Parameters to add refund information
* @returns The extensionData object
*/
public createExtensionsDataForAddRefundInformation(
parameters: ExtensionTypes.PnAddressBased.IAddRefundAddressParameters,
): ExtensionTypes.IAction {
return this.extension.createAddRefundAddressAction({
refundAddress: parameters.refundAddress,
});
}
/**
* Gets the balance and the payment/refund events
*
* @param request the request to check
* @returns the balance and the payment/refund events
*/
public async getBalance(
request: RequestLogicTypes.IRequest,
): Promise<PaymentTypes.ERC20BalanceWithEvents> {
if (!request.currency.network) {
request.currency.network = 'mainnet';
}
if (!supportedNetworks.includes(request.currency.network)) {
return getBalanceErrorObject(
`Payment network ${
request.currency.network
} not supported by ERC20 payment detection. Supported networks: ${supportedNetworks.join(
', ',
)}`,
PaymentTypes.BALANCE_ERROR_CODE.NETWORK_NOT_SUPPORTED,
);
}
try {
const paymentAddress =
request.extensions[ExtensionTypes.ID.PAYMENT_NETWORK_ERC20_ADDRESS_BASED].values
.paymentAddress;
const refundAddress =
request.extensions[ExtensionTypes.ID.PAYMENT_NETWORK_ERC20_ADDRESS_BASED].values
.refundAddress;
let payments: PaymentTypes.ERC20BalanceWithEvents = { balance: '0', events: [] };
if (paymentAddress) {
payments = await this.extractBalanceAndEvents(
paymentAddress,
PaymentTypes.EVENTS_NAMES.PAYMENT,
request.currency.network,
request.currency.value,
);
}
let refunds: PaymentTypes.ERC20BalanceWithEvents = { balance: '0', events: [] };
if (refundAddress) {
refunds = await this.extractBalanceAndEvents(
refundAddress,
PaymentTypes.EVENTS_NAMES.REFUND,
request.currency.network,
request.currency.value,
);
}
const balance: string = new bigNumber(payments.balance || 0)
.sub(new bigNumber(refunds.balance || 0))
.toString();
const events: PaymentTypes.ERC20PaymentNetworkEvent[] = [
...payments.events,
...refunds.events,
].sort((a, b) => (a.timestamp || 0) - (b.timestamp || 0));
return {
balance,
events,
};
} catch (error) {
return getBalanceErrorObject(error.message);
}
}
/**
* Extracts the balance and events of an address
*
* @private
* @param address Address to check
* @param eventName Indicate if it is an address for payment or refund
* @param network The id of network we want to check
* @param tokenContractAddress the address of the token contract
* @returns The balance
*/
private async extractBalanceAndEvents(
address: string,
eventName: PaymentTypes.EVENTS_NAMES,
network: string,
tokenContractAddress: string,
): Promise<PaymentTypes.ERC20BalanceWithEvents> {
const infoRetriever = new Erc20InfoRetriever(tokenContractAddress, address, eventName, network);
const events = await infoRetriever.getTransferEvents();
const balance = events
.reduce((acc, event) => acc.add(new bigNumber(event.amount)), new bigNumber(0))
.toString();
return {
balance,
events,
};
}
}