62 lines
1.5 KiB
TypeScript
62 lines
1.5 KiB
TypeScript
import { BigNumberish, constants, Signature, Wallet } from 'ethers'
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import { splitSignature } from 'ethers/lib/utils'
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import { TestERC20, TestERC20PermitAllowed } from '../../typechain'
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export async function getPermitSignature(
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wallet: Wallet,
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token: TestERC20 | TestERC20PermitAllowed,
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spender: string,
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value: BigNumberish = constants.MaxUint256,
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deadline = constants.MaxUint256,
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permitConfig?: { nonce?: BigNumberish; name?: string; chainId?: number; version?: string }
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): Promise<Signature> {
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const [nonce, name, version, chainId] = await Promise.all([
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permitConfig?.nonce ?? token.nonces(wallet.address),
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permitConfig?.name ?? token.name(),
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permitConfig?.version ?? '1',
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permitConfig?.chainId ?? wallet.getChainId(),
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])
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return splitSignature(
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await wallet._signTypedData(
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{
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name,
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version,
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chainId,
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verifyingContract: token.address,
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},
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{
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Permit: [
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{
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name: 'owner',
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type: 'address',
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},
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{
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name: 'spender',
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type: 'address',
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},
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{
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name: 'value',
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type: 'uint256',
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},
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{
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name: 'nonce',
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type: 'uint256',
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},
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{
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name: 'deadline',
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type: 'uint256',
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},
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],
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},
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{
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owner: wallet.address,
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spender,
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value,
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nonce,
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deadline,
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}
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)
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)
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}
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