@velora-dex/sdk/src/methods/delta/helpers/buildTWAPOrderData.ts

Velora SDK

import { Domain } from '../../common/orders/buildOrderData';
import {
  TWAPDeltaOrder,
  TWAPBuyDeltaOrder,
  TWAPOnChainOrderType,
  OnChainOrderMap,
} from './types';

const BRIDGE_EIP_712_TYPE = [
  { name: 'protocolSelector', type: 'bytes4' },
  { name: 'destinationChainId', type: 'uint256' },
  { name: 'outputToken', type: 'address' },
  { name: 'scalingFactor', type: 'int8' },
  { name: 'protocolData', type: 'bytes' },
];

const TWAP_ORDER_EIP_712_TYPES = {
  TWAPOrder: [
    { name: 'owner', type: 'address' },
    { name: 'beneficiary', type: 'address' },
    { name: 'srcToken', type: 'address' },
    { name: 'destToken', type: 'address' },
    { name: 'nonce', type: 'uint256' },
    { name: 'partnerAndFee', type: 'uint256' },
    { name: 'deadline', type: 'uint64' },
    { name: 'interval', type: 'uint64' },
    { name: 'numSlices', type: 'uint32' },
    { name: 'destAmountPerSlice', type: 'uint256' },
    { name: 'totalSrcAmount', type: 'uint256' },
    { name: 'permit', type: 'bytes' },
    { name: 'metadata', type: 'bytes' },
    { name: 'bridge', type: 'Bridge' },
  ],
  Bridge: BRIDGE_EIP_712_TYPE,
};

const TWAP_BUY_ORDER_EIP_712_TYPES = {
  TWAPBuyOrder: [
    { name: 'owner', type: 'address' },
    { name: 'beneficiary', type: 'address' },
    { name: 'srcToken', type: 'address' },
    { name: 'destToken', type: 'address' },
    { name: 'nonce', type: 'uint256' },
    { name: 'partnerAndFee', type: 'uint256' },
    { name: 'deadline', type: 'uint64' },
    { name: 'interval', type: 'uint64' },
    { name: 'numSlices', type: 'uint32' },
    { name: 'totalDestAmount', type: 'uint256' },
    { name: 'maxSrcAmount', type: 'uint256' },
    { name: 'permit', type: 'bytes' },
    { name: 'metadata', type: 'bytes' },
    { name: 'bridge', type: 'Bridge' },
  ],
  Bridge: BRIDGE_EIP_712_TYPE,
};

export type SignableTWAPSellOrderData = {
  types: typeof TWAP_ORDER_EIP_712_TYPES;
  domain: Domain;
  data: TWAPDeltaOrder;
};

export type SignableTWAPBuyOrderData = {
  types: typeof TWAP_BUY_ORDER_EIP_712_TYPES;
  domain: Domain;
  data: TWAPBuyDeltaOrder;
};

export type SignableTWAPOrderData =
  | SignableTWAPSellOrderData
  | SignableTWAPBuyOrderData;

type ProduceTWAPOrderTypedDataInput<T extends TWAPOnChainOrderType> = {
  orderInput: OnChainOrderMap[T];
  paraswapDeltaAddress: string;
  chainId: number;
  onChainOrderType: T;
};

export function produceTWAPOrderTypedData(
  params: ProduceTWAPOrderTypedDataInput<'TWAPOrder'>
): SignableTWAPSellOrderData;
export function produceTWAPOrderTypedData(
  params: ProduceTWAPOrderTypedDataInput<'TWAPBuyOrder'>
): SignableTWAPBuyOrderData;
export function produceTWAPOrderTypedData({
  orderInput,
  chainId,
  paraswapDeltaAddress,
  onChainOrderType,
}: ProduceTWAPOrderTypedDataInput<TWAPOnChainOrderType>) {
  const domain: Domain = {
    name: 'Portikus',
    version: '2.0.0',
    chainId,
    verifyingContract: paraswapDeltaAddress,
  };

  if (onChainOrderType === 'TWAPOrder') {
    return {
      types: TWAP_ORDER_EIP_712_TYPES,
      domain,
      data: orderInput,
    };
  }

  return {
    types: TWAP_BUY_ORDER_EIP_712_TYPES,
    domain,
    data: orderInput,
  };
}