contract-registry

Ethereum Smart Contract key-value registry
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Registry.sol (2039B)

      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: 4
      6 // Description: Keyed smart contract registry
      7 
      8 
      9 contract ContractRegistry {
     10 	mapping (bytes32 => address) entries;
     11 
     12 	// Implements ERC173
     13 	address public owner;
     14 
     15 	// Implements Registry
     16 	bytes32[] public identifier;
     17 
     18 	// Implements ERC173
     19 	event OwnershipTransferred(address indexed _previousOwner, address indexed _newOwner);
     20 
     21 	// Implements Registry
     22 	event AddressKey(bytes32 indexed _key, address _address);
     23 
     24 	constructor(bytes32[] memory _identifiers) {
     25 		owner = msg.sender;
     26 		for (uint i = 0; i < _identifiers.length; i++) {
     27 			identifier.push(_identifiers[i]);
     28 		}
     29 	}
     30 
     31 	// Assign address to identifier
     32 	function set(bytes32 _identifier, address _address) public returns (bool) {
     33 		require(msg.sender == owner);
     34 		require(entries[_identifier] == address(0));
     35 		require(_address != address(0));
     36 
     37 		bool found = false;
     38 		for (uint i = 0; i < identifier.length; i++) {
     39 			if (identifier[i] == _identifier) {
     40 				found = true;
     41 			}	
     42 		}
     43 		require(found);
     44 
     45 		entries[_identifier] = _address;
     46 
     47 		emit AddressKey(_identifier, _address);
     48 
     49 		return true;
     50 	}
     51 
     52 	// Implements EIP 173
     53 	function transferOwnership(address _newOwner) public returns (bool) {
     54 		address _oldOwner;
     55 
     56 		require(msg.sender == owner, 'ERR_AXX');
     57 		_oldOwner = owner;
     58 		owner = _newOwner;
     59 		emit OwnershipTransferred(_oldOwner, _newOwner);
     60 		return true;
     61 	}
     62 
     63 	// Implements Registry
     64 	function addressOf(bytes32 _identifier) public view returns (address) {
     65 		return entries[_identifier];
     66 	}
     67 
     68 	// Implements Registry
     69 	function identifierCount() public view returns(uint256) {
     70 		return identifier.length;
     71 	}
     72 
     73 	// Implements ERC165
     74 	function supportsInterface(bytes4 _sum) public pure returns (bool) {
     75 		if (_sum == 0xeffbf671) { // Registry
     76 			return true;
     77 		}
     78 		if (_sum == 0x01ffc9a7) { // ERC165
     79 			return true;
     80 		}
     81 		if (_sum == 0x9493f8b2) { // ERC173
     82 			return true;
     83 		}
     84 		return false;
     85 	}
     86 }