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[] entries;
mapping(address => uint256) entryIndex;
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mapping(address => bool) writers;
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address public owner;
address newOwner;
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event AddressAdded(address indexed addedAccount, uint256 indexed accountIndex); // AccountsIndex
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event OwnershipTransferred(address indexed previousOwner, address indexed newOwner); // EIP173
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constructor() public {
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owner = msg.sender;
entries.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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}
// Implements AccountsIndex
function add(address _account) external returns (bool) {
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require(writers[msg.sender]);
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require(entryIndex[_account] == 0);
entryIndex[_account] = entries.length;
entries.push(_account);
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emit AddressAdded(_account, entries.length-1);
return true;
}
// Implements AccountsIndex
function have(address _account) external view returns (bool) {
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return entryIndex[_account] > 0;
}
// Implements AccountsIndex
function entry(uint256 _idx) public returns (address) {
return entries[_idx+1];
}
// Implements AccountsIndex
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function entryCount() public returns (uint256) {
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return entries.length - 1;
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}
// Implements EIP173
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function transferOwnership(address _newOwner) public returns (bool) {
require(msg.sender == owner);
newOwner = _newOwner;
}
// Implements OwnedAccepter
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function acceptOwnership() public returns (bool) {
address oldOwner;
require(msg.sender == newOwner);
oldOwner = owner;
owner = newOwner;
newOwner = address(0);
emit OwnershipTransferred(oldOwner, owner);
}
// Implements EIP165
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function supportsInterface(bytes4 _sum) public pure returns (bool) {
if (_sum == 0xcbdb05c7) { // AccountsIndex
return true;
}
if (_sum == 0x01ffc9a7) { // EIP165
return true;
}
if (_sum == 0x9493f8b2) { // EIP173
return true;
}
if (_sum == 0x37a47be4) { // OwnedAccepter
return true;
}
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if (_sum == 0x80c84bd6) { // Writer
return true;
}
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return false;
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}
}