90 lines
2.1 KiB
Solidity
90 lines
2.1 KiB
Solidity
pragma solidity ^0.5.7;
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import "./ERC20Token.sol";
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contract ERC20Receiver {
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event TokenDeposited(address indexed token, address indexed sender, uint256 amount);
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event TokenWithdrawn(address indexed token, address indexed sender, uint256 amount);
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mapping (address => mapping(address => uint256)) tokenBalances;
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constructor() public {
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}
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function depositToken(
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ERC20Token _token
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)
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external
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{
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_depositToken(
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msg.sender,
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_token,
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_token.allowance(
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msg.sender,
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address(this)
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)
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);
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}
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function withdrawToken(
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ERC20Token _token,
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uint256 _amount
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)
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external
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{
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_withdrawToken(msg.sender, _token, _amount);
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}
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function depositToken(
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ERC20Token _token,
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uint256 _amount
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)
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external
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{
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require(_token.allowance(msg.sender, address(this)) >= _amount, "Bad argument");
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_depositToken(msg.sender, _token, _amount);
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}
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function tokenBalanceOf(
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ERC20Token _token,
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address _from
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)
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external
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view
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returns(uint256 fromTokenBalance)
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{
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return tokenBalances[address(_token)][_from];
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}
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function _depositToken(
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address _from,
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ERC20Token _token,
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uint256 _amount
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)
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private
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{
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require(_amount != 0, "Amount is required to be more than zero");
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if (_token.transferFrom(_from, address(this), _amount)) {
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tokenBalances[address(_token)][_from] += _amount;
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emit TokenDeposited(address(_token), _from, _amount);
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}
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}
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function _withdrawToken(
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address _from,
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ERC20Token _token,
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uint256 _amount
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)
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private
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{
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require(_amount > 0, "Bad argument");
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require(tokenBalances[address(_token)][_from] >= _amount, "Insufficient funds");
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tokenBalances[address(_token)][_from] -= _amount;
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require(_token.transfer(_from, _amount), "Transfer fail");
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emit TokenWithdrawn(address(_token), _from, _amount);
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}
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} |