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Add ERC-165 support (#4)

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Alex Beregszaszi 2020-05-14 12:19:03 +01:00 committed by GitHub
parent 0b50a3e1f5
commit 2b6c176043
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1 changed files with 16 additions and 1 deletions
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17
deposit_contract.sol
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@ -24,9 +24,20 @@ interface IDepositContract {
function get_deposit_count() external view returns (bytes memory); function get_deposit_count() external view returns (bytes memory);
} }
// Based on official specification in https://eips.ethereum.org/EIPS/eip-165
interface ERC165 {
/// @notice Query if a contract implements an interface
/// @param interfaceId The interface identifier, as specified in ERC-165
/// @dev Interface identification is specified in ERC-165. This function
/// uses less than 30,000 gas.
/// @return `true` if the contract implements `interfaceId` and
/// `interfaceId` is not 0xffffffff, `false` otherwise
function supportsInterface(bytes4 interfaceId) external pure returns (bool);
}
// This is a rewrite of the Vyper Eth2.0 deposit contract in Solidity. // This is a rewrite of the Vyper Eth2.0 deposit contract in Solidity.
// It tries to stay as close as possible to the original source code. // It tries to stay as close as possible to the original source code.
contract DepositContract is IDepositContract { contract DepositContract is IDepositContract, ERC165 {
uint constant GWEI = 1e9; uint constant GWEI = 1e9;
uint constant MIN_DEPOSIT_AMOUNT = 1 ether; uint constant MIN_DEPOSIT_AMOUNT = 1 ether;
@ -128,6 +139,10 @@ contract DepositContract is IDepositContract {
assert(false); assert(false);
} }
function supportsInterface(bytes4 interfaceId) override external pure returns (bool) {
return interfaceId == type(ERC165).interfaceId || interfaceId == type(IDepositContract).interfaceId;
}
function to_little_endian_64(uint64 value) internal pure returns (bytes memory ret) { function to_little_endian_64(uint64 value) internal pure returns (bytes memory ret) {
// Unrolled the loop here. // Unrolled the loop here.
ret = new bytes(8); ret = new bytes(8);