eth-address-index/solidity/AddressDeclarator.sol

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pragma solidity >0.6.11;
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// SPDX-License-Identifier: GPL-3.0-or-later
contract AddressDeclarator {
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// EIP 173
address public owner;
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mapping( address => address[] ) declarationIndex;
mapping( bytes32 => uint256 ) declarationContentIndex;
mapping( address => address[] ) declarator;
mapping( address => address[] ) declaratorReverse;
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bytes32[][] public contents;
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constructor(bytes32 _initialDescription) public {
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bytes32[] memory foundation;
owner = msg.sender;
contents.push(foundation);
contents[contents.length-1].push(blockhash(block.number));
addDeclaration(msg.sender, _initialDescription);
}
// EIP 172
function transferOwnership() public {
revert("owner cannot be changed");
}
// EIP-165
function supportsInterface(bytes4 interfaceID) public view returns ( bool ) {
return false;
}
function toReference(address _declarator, address _subject) private pure returns ( bytes32 ) {
bytes32 k;
bytes memory signMaterial = new bytes(40);
bytes memory addrBytes = abi.encodePacked(_declarator);
for (uint256 i = 0; i < 20; i++) {
signMaterial[i] = addrBytes[i];
}
addrBytes = abi.encodePacked(_subject);
for (uint256 i = 0; i < 20; i++) {
signMaterial[i+20] = addrBytes[i];
}
k = sha256(signMaterial);
return k;
}
function declaratorCount(address _subject) public view returns ( uint256 ) {
return declarator[_subject].length;
}
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function declaratorAddressAt(address _subject, uint256 _idx) public view returns ( address ) {
return declarator[_subject][_idx];
}
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function addDeclaration(address _subject, bytes32 _proof) public returns ( bool ) {
bytes32 k;
bytes32[] memory declarationContents;
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uint256 idx;
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k = toReference(msg.sender, _subject);
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idx = declarationContentIndex[k];
if (idx == 0) { // This also works for the constructor :)
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declarator[_subject].push(msg.sender);
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contents.push(declarationContents); //= contents[idx],
declarationIndex[msg.sender].push(_subject);
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}
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idx = contents.length-1;
declarationContentIndex[k] = idx;
contents[idx].push(_proof);
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return true;
}
function declaration(address _declarator, address _subject) public view returns ( bytes32[] memory ) {
bytes32 k;
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uint256 idx;
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k = toReference(_declarator, _subject);
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idx = declarationContentIndex[k];
return contents[idx];
}
function declarationCount(address _declarator) public view returns ( uint256 ) {
return declarationIndex[_declarator].length;
}
function declarationAddressAt(address _declarator, uint256 _idx) public view returns ( address ) {
return declarationIndex[_declarator][_idx];
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}
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}