@tempus-labs/utils/ts/token/PermitUtils.js

Tempus utility helpers

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.constructPermit = void 0;
const ContractBase_1 = require("../utils/ContractBase");
const utils_1 = require("ethers/lib/utils");
const permitTypes = {
    Permit: [
        { name: "owner", type: "address" },
        { name: "spender", type: "address" },
        { name: "value", type: "uint256" },
        { name: "nonce", type: "uint256" },
        { name: "deadline", type: "uint256" }
    ]
};
async function getPermitStruct(token, owner, spender, value, deadline) {
    return {
        owner: (0, ContractBase_1.addressOf)(owner),
        spender: (0, ContractBase_1.addressOf)(spender),
        value: token.toBigNum(value),
        nonce: await token.contract.nonces((0, ContractBase_1.addressOf)(owner)),
        deadline: deadline
    };
}
async function getDomain(token, chainId) {
    return {
        name: await token.name(),
        version: '1',
        chainId: chainId,
        verifyingContract: token.address
    };
}
async function constructPermit(token, user, spender, value, deadline) {
    const deadlineInt = parseInt((deadline.getTime() / 1000).toFixed(0));
    const permitData = await getPermitStruct(token, user, spender, value, deadlineInt);
    const signature = (0, utils_1.splitSignature)(await user._signTypedData(await getDomain(token, await user.getChainId()), permitTypes, permitData));
    return {
        token: token.address,
        value: permitData.value,
        deadline: permitData.deadline,
        v: signature.v,
        r: signature.r,
        s: signature.s
    };
}
exports.constructPermit = constructPermit;
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