eth-accounts-index/solidity/AccountsIndex.sol

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pragma solidity >0.6.11;
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// SPDX-License-Identifier: GPL-3.0-or-later
contract CustodialAccountIndex {
address[] public accounts;
mapping(address => uint256) public accountsIndex;
uint256 public count;
mapping(address => bool) writers;
address owner;
event AccountAdded(address indexed addedAccount, uint256 indexed accountIndex);
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constructor() public {
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owner = msg.sender;
accounts.push(address(0));
count = 1;
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}
function addWriter(address _writer) public returns (bool) {
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require(owner == msg.sender);
writers[_writer] = true;
return true;
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}
function deleteWriter(address _writer) public returns (bool) {
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require(owner == msg.sender);
delete writers[_writer];
return true;
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}
function add(address _account) external returns (bool) {
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require(writers[msg.sender]);
require(accountsIndex[_account] == 0);
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accounts.push(_account);
accountsIndex[_account] = count;
count++;
emit AccountAdded(_account, count-1);
return true;
}
function have(address _account) external view returns (bool) {
return accountsIndex[_account] > 0;
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}
}