dependabot/npm_and_yarn/markdown-it-and-markdownlint-cli-13.0.1 #383
Description
CODE_OF_CONDUCT.mdFUNDING.yml.gitattributesREADME.md#> pip3 install solidity_parser #> python3 -m solidity_parser <parse|outline> <path_to_contract.sol> # print parse tree or sourceUnit outlineimport { signTypedData_v4 } from 'eth-sig-util' import { fromRpcSig } from 'ethereumjs-util' // ... other imports import aTokenAbi from "./aTokenAbi.json" // ... setup your web3 provider const aTokenAddress = "ATOKEN_ADDRESS" const aTokenContract = new web3.eth.Contract(aTokenAbi, aTokenAddress) const privateKey = "YOUR_PRIVATE_KEY_WITHOUT_0x" const chainId = 1 const owner = "OWNER_ADDRESS" const spender = "SPENDER_ADDRESS" const value = 100 // Amount the spender is permitted const nonce = 1 // The next valid nonce, use _nonces() const deadline = 1600093162 const permitParams = { types: { EIP712Domain: [ { name: "name", type: "string" }, { name: "version", type: "string" }, { name: "chainId", type: "uint256" }, { name: "verifyingContract", type: "address" }, ], Permit: [ { name: "owner", type: "address" }, { name: "spender", type: "address" }, { name: "value", type: "uint256" }, { name: "nonce", type: "uint256" }, { name: "deadline", type: "uint256" }, ], }, primaryType: "Permit", domain: { name: "aTOKEN_NAME", version: "1", chainId: chainId, verifyingContract: aTokenAddress, }, message: { owner, spender, value, nonce, deadline, }, } const signature = signTypedData_v4( Buffer.from(privateKey, "hex"), { data: permitParams } ) // The signature can now be used to execute the transaction const { v, r, s } = fromRpcSig(signature) await aTokenContract.methods .permit({ owner, spender, value, deadline, v, r, s }) .send() .catch((e) => { throw Error(Error permitting: ${e.message}) })