DN404 identification

Currently, it would be possible to use staticcall for mirrorERC721 in order to detect if the contract is DN404 however this could also cause an issue with abi.decode since it doesn't catch decoding errors effectively

argotorg/solidity#10381

Therefore, the cleanest method would be supporting an arbitrary value for supportsInterface function

#68

function _getMirrorERC721(address possibleDN404) internal view returns (address result) {
    assembly {
        mstore(0x00, 0x4ef41efc) // `mirrorERC721()`.
        if and(
            gt(returndatasize(), 0x1f),
            staticcall(gas(), possibleDN404, 0x1c, 0x04, 0x00, 0x20)
        ) {
            // If result is a non-zero address, contract is very likely DN404.
            result := shr(96, mload(0x0c)) 
        }
    }   
}

Sounds like good suggestion.

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DN404 identification #69

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DN404 identification #69

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Vectorized commented on Feb 15, 2024

Vectorized commented on Feb 15, 2024

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