Proxy contract

In the repo, trying to implement and test upgradable proxy contract.

Practice 1

• UpgradeableProxy.sol

• TradingCenter.sol: version 1 contract with exchange function to transfer USDT or USDC

• TradingCenterV2.sol: version 2 contract with malicious empty function to rub all users' money

• TradingCenterTest.t.sol

  • user1, user2 approve to proxy contract
  • upgrade version 1 contract to version 2
  • Initialize TradingCenterV2
  • empty users' account

practice 2

• FiatTokenV3.sol:

  • mimick to upgrade USDC contract
  • with new whitelist function that both mint() and transfer() require msg.sender who is in the whitelist to call
  • require to preserve the same slots as FiatTokenV2_1 at first

• FiatTokenV3Test.t.sol:

  • set users as leaf to implement merkle tree function and get root and proof
  • fork the ethereum mainnet
  • get admin address through ADMIN_SLOT
  • upgrade the proxy pointer from V2_1 to V3
  • check contract version()
  • test mint() and transfer()
  • USDC proxy contract on etherscan
  • USDC FiatTokenV2_1 contract

Documentation

Environment: foundry

https://book.getfoundry.sh/

Build

1. download fuundry

curl -L https://foundry.paradigm.xyz | bash

2. install or update foundry

foundryup

3. create new project

forge init [project name]

4. install openzepplin

forge install openzeppelin/openzeppelin-contracts --no-commit

5. install Merkle

forge install dmfxyz/murky --no-commit

6. add dependencies and path

forge remappings > remappings.txt

Test

1. download the git

git clone https://github.com/Rita94105/proxy.git

2. adjust the path

cd proxy

3. test Practice 1

forge test --mc TradingCenter

• test result

4. test Practice 2

forge test --mc FiatTokenV3 

• test result