eth-address-index/solidity/AccountsIndexAddressDeclarator.sol

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pragma solidity >0.6.11;
// SPDX-License-Identifier: GPL-3.0-or-later
contract AccountsIndexAddressDeclarator {
address public tokenAddress;
bytes32 tokenAddressHash;
address public addressDeclaratorAddress;
mapping(address => uint256) entryIndex;
uint256 count;
address public owner;
address newOwner;
event AddressAdded(address indexed addedAccount, uint256 indexed accountIndex); // AccountsIndex
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner); // EIP173
constructor(address _tokenAddress, address _addressDeclaratorAddress) public {
bytes memory _tokenAddressPadded;
owner = msg.sender;
addressDeclaratorAddress = _addressDeclaratorAddress;
tokenAddress = _tokenAddress;
_tokenAddressPadded = abi.encode(tokenAddress);
tokenAddressHash = sha256(_tokenAddressPadded);
count = 1;
}
function add(address _account) external returns (bool) {
bool ok;
bytes memory r;
uint256 oldEntryIndex;
(ok, r) = addressDeclaratorAddress.call(abi.encodeWithSignature("addDeclaration(address,bytes32)", _account, tokenAddressHash));
require(ok);
require(r[31] == 0x01);
oldEntryIndex = count;
entryIndex[_account] = oldEntryIndex;
count++;
emit AddressAdded(_account, oldEntryIndex);
return true;
}
function have(address _account) external view returns (bool) {
return entryIndex[_account] > 0;
}
}