71 lines
2.0 KiB
TypeScript
71 lines
2.0 KiB
TypeScript
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import { BytesLike } from 'ethers'
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import { splitSignature } from 'ethers/lib/utils'
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import { ChainId } from '@/types'
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import { onSignInput, Permit, PermitInput } from './@types'
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import { getWalletProvider } from '@/services'
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const getMessageParams = (verifyingContract: string, permit: Permit) => {
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return JSON.stringify({
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types: {
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EIP712Domain: [
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{ name: 'name', type: 'string' },
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{ name: 'version', type: 'string' },
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{ name: 'chainId', type: 'uint256' },
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{ name: 'verifyingContract', type: 'address' },
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],
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Permit: [
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{ name: 'owner', type: 'address' },
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{ name: 'spender', type: 'address' },
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{ name: 'value', type: 'uint256' },
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{ name: 'nonce', type: 'uint256' },
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{ name: 'deadline', type: 'uint256' },
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],
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},
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primaryType: 'Permit',
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domain: {
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name: 'TornadoCash',
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version: '1',
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chainId: ChainId.MAINNET,
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verifyingContract,
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},
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message: permit,
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})
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}
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async function onSign({ nameProvider, methodPayload }: onSignInput) {
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const provider = getWalletProvider(nameProvider)
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try {
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const params = {
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method: 'eth_signTypedData_v4',
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params: methodPayload,
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}
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const signature = await provider.sendRequest<BytesLike>(params)
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return signature
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} catch (err) {
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if (err.message === 'Method eth_signTypedData_v4 not supported.') {
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const params = {
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method: 'eth_signTypedData',
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params: methodPayload.reverse(),
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}
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const signature = await provider.sendRequest<BytesLike>(params)
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return signature
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} else {
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throw err
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}
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}
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}
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export async function onPermit({ token, nameProvider, ...permit }: PermitInput) {
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const methodPayload = [permit.owner, getMessageParams(token, permit)]
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try {
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const signature = await onSign({ methodPayload, nameProvider })
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return splitSignature(signature)
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} catch (err) {
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throw new Error(`OnPermit method has error: ${err.message}`)
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}
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}
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