laconicd-deprecated/tests-solidity/suites/proxy/contracts/IsContract.sol
Brett Sun c9639c3860
tests: add solidity test suites (#487)
* tests: add solidity test suite

* tests: remove require strings

* Update tests-solidity/init-test-node.sh

* Update tests-solidity/init-test-node.sh

Co-authored-by: Federico Kunze <31522760+fedekunze@users.noreply.github.com>
2020-09-01 17:16:28 -04:00

22 lines
629 B
Solidity

pragma solidity ^0.4.24;
contract IsContract {
/*
* NOTE: this should NEVER be used for authentication
* (see pitfalls: https://github.com/fergarrui/ethereum-security/tree/master/contracts/extcodesize).
*
* This is only intended to be used as a sanity check that an address is actually a contract,
* RATHER THAN an address not being a contract.
*/
function isContract(address _target) internal view returns (bool) {
if (_target == address(0)) {
return false;
}
uint256 size;
assembly { size := extcodesize(_target) }
return size > 0;
}
}