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feat: modify top up factories to work with different stablecoins
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,127 @@ | ||
| // SPDX-FileCopyrightText: 2022 Lido <info@lido.fi> | ||
| // SPDX-License-Identifier: GPL-3.0 | ||
| pragma solidity ^0.8.4; | ||
|
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| import "OpenZeppelin/openzeppelin-contracts@4.3.2/contracts/access/AccessControl.sol"; | ||
| import "OpenZeppelin/openzeppelin-contracts@4.3.2/contracts/token/ERC20/extensions/IERC20Metadata.sol"; | ||
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| contract AllowedTokensRegistry is AccessControl { | ||
| // ------------- | ||
| // EVENTS | ||
| // ------------- | ||
| event TokenAdded(address indexed _token); | ||
| event TokenRemoved(address indexed _token); | ||
|
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| // ------------- | ||
| // ROLES | ||
| // ------------- | ||
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| bytes32 public constant ADD_TOKEN_TO_ALLOWED_LIST_ROLE = keccak256("ADD_TOKEN_TO_ALLOWED_LIST_ROLE"); | ||
| bytes32 public constant REMOVE_TOKEN_FROM_ALLOWED_LIST_ROLE = keccak256("REMOVE_TOKEN_FROM_ALLOWED_LIST_ROLE"); | ||
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| // ------------- | ||
| // ERRORS | ||
| // ------------- | ||
| string private constant ERROR_TOKEN_ALREADY_ADDED_TO_ALLOWED_LIST = "TOKEN_ALREADY_ADDED_TO_ALLOWED_LIST"; | ||
| string private constant ERROR_TOKEN_NOT_FOUND_IN_ALLOWED_LIST = "TOKEN_NOT_FOUND_IN_ALLOWED_LIST"; | ||
| string private constant ERROR_TOKEN_ADDRESS_IS_ZERO = "TOKEN_ADDRESS_IS_ZERO"; | ||
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| // ------------- | ||
| // VARIABLES | ||
| // ------------- | ||
| /// @dev List of allowed tokens for payouts | ||
| address[] public allowedTokens; | ||
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| // Position of the address in the `allowedTokens` array, | ||
| // plus 1 because index 0 means a value is not in the set. | ||
| mapping(address => uint256) private allowedTokenIndices; | ||
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| /// @notice Precise number of tokens in the system | ||
| uint8 public constant PRECISION = 18; | ||
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| constructor( | ||
| address _admin, | ||
| address[] memory _addTokenToAllowedListRoleHolders, | ||
| address[] memory _removeTokenFromAllowedListRoleHolders | ||
| ) { | ||
| _setupRole(DEFAULT_ADMIN_ROLE, _admin); | ||
| for (uint256 i = 0; i < _addTokenToAllowedListRoleHolders.length; i++) { | ||
| _setupRole(ADD_TOKEN_TO_ALLOWED_LIST_ROLE, _addTokenToAllowedListRoleHolders[i]); | ||
| } | ||
| for (uint256 i = 0; i < _removeTokenFromAllowedListRoleHolders.length; i++) { | ||
| _setupRole(REMOVE_TOKEN_FROM_ALLOWED_LIST_ROLE, _removeTokenFromAllowedListRoleHolders[i]); | ||
| } | ||
| } | ||
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| // ------------- | ||
| // EXTERNAL METHODS | ||
| // ------------- | ||
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| /// @notice Adds address to list of allowed tokens for payouts | ||
| function addToken(address _token) external onlyRole(ADD_TOKEN_TO_ALLOWED_LIST_ROLE) { | ||
| require(_token != address(0), ERROR_TOKEN_ADDRESS_IS_ZERO); | ||
| require(allowedTokenIndices[_token] == 0, ERROR_TOKEN_ALREADY_ADDED_TO_ALLOWED_LIST); | ||
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| allowedTokens.push(_token); | ||
| allowedTokenIndices[_token] = allowedTokens.length; | ||
| emit TokenAdded(_token); | ||
| } | ||
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| /// @notice Removes address from list of allowed tokens for payouts | ||
| /// @dev To delete an allowed token from the allowedTokens array in O(1), | ||
| /// we swap the element to delete with the last one in the array, | ||
| /// and then remove the last element (sometimes called as 'swap and pop'). | ||
| function removeToken(address _token) external onlyRole(REMOVE_TOKEN_FROM_ALLOWED_LIST_ROLE) { | ||
| uint256 index = _getAllowedTokenIndex(_token); | ||
| uint256 lastIndex = allowedTokens.length - 1; | ||
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| if (index != lastIndex) { | ||
| address lastAllowedToken = allowedTokens[lastIndex]; | ||
| allowedTokens[index] = lastAllowedToken; | ||
| allowedTokenIndices[lastAllowedToken] = index + 1; | ||
| } | ||
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| allowedTokens.pop(); | ||
| delete allowedTokenIndices[_token]; | ||
| emit TokenRemoved(_token); | ||
| } | ||
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| /// @notice Returns if passed address is listed as allowed token in the registry | ||
| function isTokenAllowed(address _token) external view returns (bool) { | ||
| return allowedTokenIndices[_token] > 0; | ||
| } | ||
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| /// @notice Returns current list of allowed tokens | ||
| function getAllowedTokens() external view returns (address[] memory) { | ||
| return allowedTokens; | ||
| } | ||
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| /// @notice Transforms amout from token format to precise format | ||
| function normalizeAmount(uint256 _tokenAmount, address _token) external view returns (uint256) { | ||
| require(_token != address(0), ERROR_TOKEN_ADDRESS_IS_ZERO); | ||
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| uint8 tokenDecimals = IERC20Metadata(_token).decimals(); | ||
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| if (tokenDecimals == PRECISION) return _tokenAmount; | ||
| if (tokenDecimals > PRECISION) { | ||
| uint256 difference = tokenDecimals - PRECISION; | ||
| uint256 remainder = _tokenAmount % (10 ** difference); | ||
| uint256 quotient = _tokenAmount / (10 ** difference); | ||
| if (remainder > 0) { | ||
| quotient += 1; | ||
| } | ||
| return quotient; | ||
| } | ||
| return _tokenAmount * 10 ** (PRECISION - tokenDecimals); | ||
| } | ||
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| // ------------------ | ||
| // PRIVATE METHODS | ||
| // ------------------ | ||
|
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| function _getAllowedTokenIndex(address _token) private view returns (uint256 _index) { | ||
| _index = allowedTokenIndices[_token]; | ||
| require(_index > 0, ERROR_TOKEN_NOT_FOUND_IN_ALLOWED_LIST); | ||
| _index -= 1; | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,13 @@ | ||
| // SPDX-FileCopyrightText: 2021 Lido <info@lido.fi> | ||
| // SPDX-License-Identifier: GPL-3.0 | ||
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| pragma solidity ^0.8.4; | ||
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| contract MockERC20 { | ||
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| uint8 public decimals; | ||
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| constructor(uint8 _decimals) { | ||
| decimals = _decimals; | ||
| } | ||
| } |
77 changes: 77 additions & 0 deletions
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dependencies/OpenZeppelin/openzeppelin-contracts@4.3.2/contracts/token/ERC20/IERC20.sol
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,77 @@ | ||
| // SPDX-License-Identifier: MIT | ||
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| pragma solidity ^0.8.0; | ||
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| /** | ||
| * @dev Interface of the ERC20 standard as defined in the EIP. | ||
| */ | ||
| interface IERC20 { | ||
| /** | ||
| * @dev Returns the amount of tokens in existence. | ||
| */ | ||
| function totalSupply() external view returns (uint256); | ||
|
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| /** | ||
| * @dev Returns the amount of tokens owned by `account`. | ||
| */ | ||
| function balanceOf(address account) external view returns (uint256); | ||
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| /** | ||
| * @dev Moves `amount` tokens from the caller's account to `recipient`. | ||
| * | ||
| * Returns a boolean value indicating whether the operation succeeded. | ||
| * | ||
| * Emits a {Transfer} event. | ||
| */ | ||
| function transfer(address recipient, uint256 amount) external returns (bool); | ||
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| /** | ||
| * @dev Returns the remaining number of tokens that `spender` will be | ||
| * allowed to spend on behalf of `owner` through {transferFrom}. This is | ||
| * zero by default. | ||
| * | ||
| * This value changes when {approve} or {transferFrom} are called. | ||
| */ | ||
| function allowance(address owner, address spender) external view returns (uint256); | ||
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| /** | ||
| * @dev Sets `amount` as the allowance of `spender` over the caller's tokens. | ||
| * | ||
| * Returns a boolean value indicating whether the operation succeeded. | ||
| * | ||
| * IMPORTANT: Beware that changing an allowance with this method brings the risk | ||
| * that someone may use both the old and the new allowance by unfortunate | ||
| * transaction ordering. One possible solution to mitigate this race | ||
| * condition is to first reduce the spender's allowance to 0 and set the | ||
| * desired value afterwards: | ||
| * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 | ||
| * | ||
| * Emits an {Approval} event. | ||
| */ | ||
| function approve(address spender, uint256 amount) external returns (bool); | ||
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| /** | ||
| * @dev Moves `amount` tokens from `sender` to `recipient` using the | ||
| * allowance mechanism. `amount` is then deducted from the caller's | ||
| * allowance. | ||
| * | ||
| * Returns a boolean value indicating whether the operation succeeded. | ||
| * | ||
| * Emits a {Transfer} event. | ||
| */ | ||
| function transferFrom(address sender, address recipient, uint256 amount) external returns (bool); | ||
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| /** | ||
| * @dev Emitted when `value` tokens are moved from one account (`from`) to | ||
| * another (`to`). | ||
| * | ||
| * Note that `value` may be zero. | ||
| */ | ||
| event Transfer(address indexed from, address indexed to, uint256 value); | ||
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| /** | ||
| * @dev Emitted when the allowance of a `spender` for an `owner` is set by | ||
| * a call to {approve}. `value` is the new allowance. | ||
| */ | ||
| event Approval(address indexed owner, address indexed spender, uint256 value); | ||
| } |
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