58 lines
1.4 KiB
TypeScript
58 lines
1.4 KiB
TypeScript
import { BigNumber, BigNumberish, constants, Signature, Wallet } from 'ethers'
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import { splitSignature } from 'ethers/lib/utils'
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import { NonfungiblePositionManager } from '../../typechain'
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export default async function getPermitNFTSignature(
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wallet: Wallet,
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positionManager: NonfungiblePositionManager,
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spender: string,
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tokenId: BigNumberish,
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deadline: BigNumberish = 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 ?? positionManager.positions(tokenId).then((p) => p.nonce),
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permitConfig?.name ?? positionManager.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: positionManager.address,
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},
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{
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Permit: [
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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: 'tokenId',
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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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tokenId,
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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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