Contract that can Send and Receive ERC20 Tokens

Concept

The Token contract holds a standard ERC20 token contract. The Transfer contract is then able to transfer a user's ERC20 tokens to and from the contract.

To receive ERC20 tokens, a user must fist approve the Transfer contract to spend x amount of tokens. That condition met, a user can then transfer up to x amount of tokens to the Transfer contract using the requestTokens() function. The Transfer contract records how much tokens the user has deposited into the contract.

To retrieve tokens, a user can execute the sendTokens() function to transfer tokens from the Transfer contract back to the user's account. A user can only retrieve the amount of tokens that they have deposited.

Note: The Transfer contract can only accept Token tokens, and only through the use of the requestTokens() function. The contract does not have access to tokens sent to the contract's address directly.

Installation

yarn install

Directories

• contracts/ - Directory for the Solidiy smart contracts
• deploy/ - Directory for the deployment scripts
• test/ - Directory for unit tests

NPM Scripts

Hardhat Scripts:

• clean - To clear the cache and delete artifacts
• compile - To compile your smart contracts
• node - Launches a local hardhat node
• test - Runs smart contract tests
• deploy - Runs your deployment scripts

Hardhat Watcher Scripts

• recompile - Watches for file changes in the contracts/ directory and runs hardhat compile as needed
• retest - Watches for *.test.js file chanes in the test/ directory and runs hardhat test as needed
• redeploy - Watches for file changes in the deploy/ directory and runs hardhat deploy as needed