critesjosh/contract_spending_cUSD

Simple app to demo how to use a contract to spend cUSD on a users behalf.

Spending cUSD from another Solidity Contract

Simple app to demo how to use a contract to spend cUSD on a users behalf.

Spending cUSD on behalf of users

This example demonstrates how a contract can be designed to spend cUSD for a user. View the simple contract in ./contracts/cUSD_spender.sol. This contract is too simple to be useful, but demonstrates the necessary concepts, namely how to access the cUSD contract from another Solidity contract.

Before the cUSD_spender contract can spend cUSD on behalf of a user, the user must approve the contract to spend cUSD for them. The ./webpage directory shows how you can do this. Essentially, in the UI the dapp will request a transaction from the user, to the cUSD contract, calling the approve function for the desired amount. Once the approve transaction is confirmed, the dapp can request to send cUSD from the user's account.

Get Started

1. Run yarn install in the project root.
2. Run node createAccount.js. This will print new Celo account details. Copy the private key for your new account into the PRIVATE_KEY variable in .env.
3. Fund the account address on the Alfajores testnet here: https://celo.org/developers/faucet
4. Deploy your own cUSD_spender contract to the Alfajores testnet with truffle migrate --network alfajores
5. Move into the ./webage directory. Run yarn to install the dependencies.
6. Run the web server with yarn dev.