tokenbridge-contracts/contracts/upgradeable_contracts/Claimable.sol

56 lines
1.8 KiB
Solidity

pragma solidity 0.4.24;
import "../libraries/Address.sol";
import "../libraries/SafeERC20.sol";
/**
* @title Claimable
* @dev Implementation of the claiming utils that can be useful for withdrawing accidentally sent tokens that are not used in bridge operations.
*/
contract Claimable {
using SafeERC20 for address;
/**
* Throws if a given address is equal to address(0)
*/
modifier validAddress(address _to) {
require(_to != address(0));
/* solcov ignore next */
_;
}
/**
* @dev Withdraws the erc20 tokens or native coins from this contract.
* Caller should additionally check that the claimed token is not a part of bridge operations (i.e. that token != erc20token()).
* @param _token address of the claimed token or address(0) for native coins.
* @param _to address of the tokens/coins receiver.
*/
function claimValues(address _token, address _to) internal validAddress(_to) {
if (_token == address(0)) {
claimNativeCoins(_to);
} else {
claimErc20Tokens(_token, _to);
}
}
/**
* @dev Internal function for withdrawing all native coins from the contract.
* @param _to address of the coins receiver.
*/
function claimNativeCoins(address _to) internal {
uint256 value = address(this).balance;
Address.safeSendValue(_to, value);
}
/**
* @dev Internal function for withdrawing all tokens of ssome particular ERC20 contract from this contract.
* @param _token address of the claimed ERC20 token.
* @param _to address of the tokens receiver.
*/
function claimErc20Tokens(address _token, address _to) internal {
ERC20Basic token = ERC20Basic(_token);
uint256 balance = token.balanceOf(this);
_token.safeTransfer(_to, balance);
}
}