erc20-limiter

ERC20 balance limit registry
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LimiterTokenRegistry.sol (1308B)

      1 pragma solidity ^0.8.0;
      2 
      3 // Author:	Louis Holbrook <dev@holbrook.no> 0826EDA1702D1E87C6E2875121D2E7BB88C2A746
      4 // SPDX-License-Identifier: AGPL-3.0-or-later
      5 // File-Version: 1
      6 // Description: Registry of allowed ERC20 balance limits per-token and per-holder.
      7 
      8 interface Limiter {
      9 	function limitOf(address,address) external view returns(uint256);
     10 	function setLimit(address,uint256) external;
     11 	function setLimitFor(address,address,uint256) external;
     12 }
     13 
     14 contract LimiterTokenRegistry {
     15 	Limiter limiter;
     16 	address holder;
     17 
     18 	constructor(address _holder, Limiter _limiter) {
     19 		holder = _holder;
     20 		limiter = _limiter;
     21 	}
     22 
     23 	function limitOf(address _token, address _holder) public view returns (uint256) {
     24 		return limiter.limitOf(_token, _holder);
     25 	}
     26 
     27 	function setLimit(address _token, uint256 _value) public {
     28 		setLimitFor(_token, msg.sender, _value);
     29 	}
     30 
     31 	function setLimitFor(address _token, address _holder, uint256 _value) public {
     32 		limiter.setLimitFor(_token, _holder, _value);
     33 	}
     34 
     35 	function have(address _token) public view returns(bool) {
     36 		return limiter.limitOf(_token, holder) > 0;
     37 	}
     38 
     39 	function supportsInterface(bytes4 _sum) public pure returns (bool) {
     40 		if (_sum == 0x01ffc9a7) { // ERC165
     41 			return true;
     42 		}
     43 		if (_sum == 0xb7bca625) { // AccountsIndex
     44 			return true;
     45 		}
     46 		return false;
     47 	}
     48 }