Contracts

RewardToken.sol

Mintable ERC20 token with properties of withdrawalFee and rewardRate for an Staking contract.

Features (owner)

• Mintable.
• Withdrawal fee modifiable and can be enabled/disabled.
• RewardRate modifiable. Can also be disabled setting to 0.

Staker.sol

Staking contract which receives and rewards with the same tokens.

Features

• In deployment can set the startBlock.
• User can deposit multiple times.
• Withdraw send all the staked tokens and reward to the user.

Deployed contracts

Contracts deployed to https://testnet.bscscan.com/

• RewardToken deployed to: 0xe3ee3acce613E5fab3a9225619A792b796aA9A37
• Staker deployed to: 0x28bcB704BB6D70562c1D61B48A858C46a1c9a204
• Start block: 20156079

Tools

• Hardhat
• ethers.js
• @openzeppelin/contracts
• hardhat-gas-reporter

Instructions

Compile and test

1. Clone repo: git clone https://github.com/leanonchain/solidity-challenge.git
2. Install dependencies: yarn
3. Compile: npx hardhat compile
4. Test: npx hardhat test

Deploy

1. Create .env file with:

BSC_TESTNET_RPC = ""
BSC_TESTNET_API_KEY = ""
PRIVATE_KEY = ""

2. npx hardhat run --network bsc_testnet scripts/deploy.js

To-do real case / with more time

• Testing refactor with typescript and remove redundant code.
• Harvest function and partial withdraw. This could be easily implemented but as I understood the requirements was for a withdraw function of all the staked tokens.