Permit wrapper for ERC20

Problem Statement

ERC2612 allows for gasless approvals for ERC20 via signatures. While many ERC20 tokens now incorporate permits, many do not. contract which serves as a wrapper to an ERC20 and allows permits.

Proposed Solution

Created a singleton contract which implements permit and relies on max allowance.
After the user gives max allowance to address(this) user can send a signature with permit method which checks the signature and transfers the tokens using safeTransferFrom method from SafeERC20.

Deployed and verified Permit contract address on kovan link

0xbe05377f035e00B3052633c9c813a2D1F20928E7

Requirements

• node
• npm
• hardhat

Setup project

1. Clone the repository

   git clone https://github.com/jatinj615/permit.git
   cd permit

2. create .env file and set environment variables

    touch .env
   
    // structure of env file
    ALCHEMY_API_KEY=<YOUR_ALCHEMY_KEY> // can use - GuY3V68erOgOioj6jYTGb1IfkJCIxhLH
    MNEMONIC=<YOUR_MNEMONIC_PRIVATE_KEY>
    OWNER_PRIVATE_KEY=<YOUR_OWNER_PRIVATE_KEY>

   refer to .env.example file for refrence.
   

   To get OWNER_PRIVATE_KEY run

   npx hardhat node
   
   // Ouput
   Account #0: 0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266 (10000 ETH)
   Private Key: 0xac0974bec39a17e36ba4a6b4d238ff944bacb478cbed5efcae784d7bf4f2ff80 //OWNER_PRIVATE_KEY(must be of Account #0)

3. Install the dependencies

   npm install

4. Compile the code

   npx hardhat compile

Run Test cases

npx hardhat test

Deploy Contract

npx hardhat run scripts/deployer.ts --network <network_name>