eth-accounts-index/solidity/AccountsIndex.sol

47 lines
1.1 KiB
Solidity

pragma solidity >=0.6.12;
// 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);
constructor() public {
owner = msg.sender;
accounts.push(address(0));
count = 1;
}
function addWriter(address _writer) public returns (bool) {
require(owner == msg.sender);
writers[_writer] = true;
return true;
}
function deleteWriter(address _writer) public returns (bool) {
require(owner == msg.sender);
delete writers[_writer];
return true;
}
function add(address _account) external returns (bool) {
require(writers[msg.sender]);
require(accountsIndex[_account] == 0);
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;
}
}