30 lines
1.4 KiB
Solidity
30 lines
1.4 KiB
Solidity
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// SPDX-License-Identifier: CC0-1.0
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pragma solidity ^0.8.0;
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// helper methods for interacting with ERC20 tokens and sending ETH that do not consistently return true/false
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library TransferHelper {
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function safeApprove(address token, address to, uint value) internal {
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// bytes4(keccak256(bytes("approve(address,uint256)")));
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(bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x095ea7b3, to, value));
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require(success && (data.length == 0 || abi.decode(data, (bool))), "AF");
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}
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function safeTransfer(address token, address to, uint value) internal {
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// bytes4(keccak256(bytes("transfer(address,uint256)")));
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(bool success, bytes memory data) = token.call(abi.encodeWithSelector(0xa9059cbb, to, value));
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require(success && (data.length == 0 || abi.decode(data, (bool))), "TF");
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}
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function safeTransferFrom(address token, address from, address to, uint value) internal {
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// bytes4(keccak256(bytes("transferFrom(address,address,uint256)")));
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(bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x23b872dd, from, to, value));
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require(success && (data.length == 0 || abi.decode(data, (bool))), "TFF");
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}
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function safeTransferETH(address to, uint value) internal {
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(bool success,) = to.call{value:value}(new bytes(0));
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require(success, "ETF");
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}
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}
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