ethers-override/dist/permit2AsIf.js

> ⚡🚀 SDK for `eth_call` override.

import { keccak256, solidityPacked, toBeHex, zeroPadValue } from "ethers";
import { AddressAsIf } from "./addressAsIf.js";
// import { abi as permit2Abi } from '../abi/permit2.json'
// const permit2Interface: Interface = new Interface(permit2Abi);
const getAllowanceSlotKey = (ownerAddress, tokenAddress, spenderAddress, mappingSlotNumber) => {
    return keccak256(zeroPadValue(spenderAddress, 32)
        + keccak256(zeroPadValue(tokenAddress, 32)
            + keccak256(zeroPadValue(ownerAddress, 32)
                + toBeHex(mappingSlotNumber, 32).slice(2)).slice(2)).slice(2));
};
export class Permit2AsIf extends AddressAsIf {
    constructor(address) {
        super(address);
        this._method = undefined;
        this._allowanceMappingSlotNumber = 1;
    }
    allowance(ownerAddress, tokenAddress, spenderAddress) {
        this._method = "allowance";
        super.stateDiff(getAllowanceSlotKey(ownerAddress, tokenAddress, spenderAddress, this._allowanceMappingSlotNumber));
        return this;
    }
    is(value) {
        if (this._method === undefined) {
            throw new Error(`Method to call of AsIf at ${this.address} is not set!`);
        }
        if (this._method === "allowance") {
            if (value === undefined
                || typeof value.amount !== 'bigint'
                || typeof value.expiration !== 'bigint'
                || typeof value.nonce !== 'bigint') {
                throw new Error(`Invalid value for ${this._method} of Permit2AsIf.`);
            }
            const slotValue = solidityPacked(["uint48", "uint48", "uint160"], [value.nonce, value.expiration, value.amount]);
            super.is(slotValue);
        }
        return this;
    }
}
;
const PERMIT2_ADDRESS = "0x000000000022d473030f116ddee9f6b43ac78ba3";
export const permit2 = new Permit2AsIf(PERMIT2_ADDRESS);
export const exportedForTesting = { getAllowanceSlotKey };