Reliable way to identify the caller

Question

Is a reliable way to identify the caller with the following code?

bool isContract = msg.sender != tx.origin;

Please don't exclude contracts from interacting with your contract. If it's to avoid some security vulnerability, it's probably ineffective, and it means that no one using a multisig wallet can use your contract. tx.origin may also stop working in future Ethereum versions, especially as account abstraction work comes in. — user19510, Jan 05 '19 at 21:55

score 0 · Answer 1 · answered Jan 05 '19 at 20:53

0

This should work. Also you can check the size of the code in the address if it is bigger than zero, is a contract

function isContract(address addr) returns (bool) {
  uint size;
  assembly { size := extcodesize(addr) }
  return size > 0;
}

Hope this helps you

answered Jan 05 '19 at 20:53

Jaime

1

Note that during execution of a contract's constructor, that address's code size will be 0. – user19510 Jan 05 '19 at 21:53

1 Answers1