erc20-faucet

ERC20 token faucet
Info | Log | Files | Refs

ERC20FaucetStorage.sol (1566B)

      1 pragma solidity >=0.8.0;
      2 
      3 // SPDX-License-Identifier: AGPL-3.0-or-later
      4 
      5 contract SingleShotFaucetStorage {
      6 	// Implements EIP 173
      7 	address public owner;
      8 	address newOwner;
      9 
     10 	mapping (address => uint256) usedAccounts;
     11 	address[] public entry;
     12 
     13 	// Implements EIP 173
     14 	event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
     15 
     16 	// Implements AccountsIndex
     17 	event AddressAdded(uint256 indexed accountIndex, address _account); // AccountsIndex
     18 
     19 	// Implements AccountsIndex
     20 	uint256 constant public time = 0;
     21 
     22 	constructor() {
     23 		owner = msg.sender;
     24 		entry.push(address(0));
     25 		usedAccounts[address(0)] = 1;
     26 	}
     27 
     28 	// Implements EIP 173
     29 	function transferOwnership(address _newOwner) external {
     30 		address _oldOwner;
     31 
     32 		require(msg.sender == owner);
     33 		_oldOwner = owner;
     34 
     35 		owner = _newOwner;
     36 
     37 		emit OwnershipTransferred(_oldOwner, owner);
     38 	}
     39 
     40 	// Implements AccountsIndex
     41 	function have(address _account) external view returns (bool) {
     42 		return usedAccounts[_account] > 0;
     43 	}
     44 
     45 	// Implements AccountsIndex
     46 	function add(address _account) external returns (bool) {
     47 		require(msg.sender == owner, 'ERR_AXX');
     48 
     49 		uint256 l;
     50 
     51 		l = entry.length;
     52 		entry.push(_account);
     53 		usedAccounts[_account] = l;
     54 		emit AddressAdded(l, _account);
     55 		return true;
     56 	}
     57 
     58 	// Implements EIP165
     59 	function supportsInterface(bytes4 _sum) public pure returns (bool) {
     60 		if (_sum == 0xb7bca625) { // AccountsIndex
     61 			return true;
     62 		}
     63 		if (_sum == 0x01ffc9a7) { // EIP165
     64 			return true;
     65 		}
     66 		if (_sum == 0x9493f8b2) { // EIP173
     67 			return true;
     68 		}
     69 		return false;
     70 	}
     71 }