​
Whitelist.sol

​
Overview

This smart contract is a simple whitelist implementation that allows an owner to add and remove addresses to/from a whitelist. The contract is designed in its current iteration to interact with EtherspotPaymaster contract to allow for a single Paymaster contract that can handle payments from sponsors to fund transaction gas for approved wallets.

​
Version

Solidity pragma version ^0.8.12.

​
Mappings

mapping(address => mapping(address => bool)) public whitelist: A mapping of sponsor addresses to another mapping of account addresses to a boolean value that indicates whether the account address is whitelisted for the sponsor address.

​
Events

  • event WhitelistInitialized(address owner): Triggered when the contract is initialized.
  • event AddedToWhitelist(address indexed paymaster, address indexed account): Triggered when an account is added to the whitelist for a specific paymaster.
  • event AddedBatchToWhitelist(address indexed paymaster, address[] indexed accounts): Triggered when multiple accounts are added to the whitelist for a specific paymaster.
  • event RemovedFromWhitelist(address indexed paymaster, address indexed account): Triggered when an account is removed from the whitelist for a specific paymaster.
  • event RemovedBatchFromWhitelist(address indexed paymaster, address[] indexed accounts): Triggered when multiple accounts are removed from the whitelist for a specific paymaster.

​
External Functions

  • function check(address _sponsor, address _account) external view returns (bool): Checks if an account is whitelisted for a specific sponsor.
  • function add(address _account) external: Adds an account to the whitelist for the caller.
    • Emits AddedToWhitelist(msg.sender, _account).
  • function addBatch(address[] calldata _accounts) external: Adds multiple accounts to the whitelist for the caller.
    • EmitsAddedBatchToWhitelist(msg.sender, _accounts).
  • function remove(address _account) external: Removes an account from the whitelist for the caller.
    • Emits RemovedFromWhitelist(msg.sender, _account).
  • function removeBatch(address[] calldata _accounts) external: Removes multiple accounts from the whitelist for the caller.
    • Emits RemovedBatchFromWhitelist(msg.sender, _accounts).

​
Internal Functions

  • function _check(address _sponsor, address _account) internal view returns (bool): Checks if an account is whitelisted for a specific sponsor.
  • function _add(address _account) internal: Adds an account to the whitelist for the caller.
    • Error Whitelist:: Zero address: Zero address cannot be added to whitelist.
    • Error Whitelist:: Account is already whitelisted: Existing whitelisted address cannot be re-added to the whitelist.
  • function _addBatch(address[] calldata _accounts) internal: Adds multiple accounts to the whitelist for the caller.
  • function _remove(address _account) internal: Removes an account from the whitelist for the caller.
    • Error Whitelist:: Zero address: Cannot try to remove zero address from whitelist.
    • Error Whitelist:: Account is not whitelisted: Must be a valid whitelisted account to be removed from whitelist.
  • function _removeBatch(address[] calldata _accounts) internal: Removes multiple accounts from the whitelist for the caller.

​
License

This contract is licensed under the MIT license.