Section 4 Detecting Smart Contract vs EOA

[shobhit-gupta]

Section 4 - Lesson 60: Reporting: Smart Contract Wallet Reverts Winning (If the winner doesn't implement receive or fallback function)

1. Do not allow smart contract entrants (not recommended)

How can a smart contract (such as PuppyRaffle) enforce this? Is there a way in Solidity to determine if a given address is a Smart Contract or an EOA (Externally Owned Account)?

[0xlrivo]

In the Address library from OpenZeppelin you can use the method isContract(address account) that returns true if the passed address is a contract.
The function was removed in the latest version of the OpenZeppelin contracts (the 5.0) but PuppyRaffle uses version 3.4 so you can still use this function.
https://docs.openzeppelin.com/contracts/3.x/api/utils#Address

[TilakMaddy]

https://solidity-by-example.org/hacks/contract-size/