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|
pragma solidity ^0.4.24;
import "./IYesComplianceToken.sol";
/**
* draft implementation of YES compliance token
*
* NOTE: i have done relatively few gas optimization tweaks (beyond using the sturctures necessary to avoid any
* linear time procedures).
* in some cases i am using a call structure which replicates some checks. this is for code clarity/security -
* i marked a few obvious ones which could be optimized for gas, but :meh:
*
* todo static owner should follow owner token? remove static owner? :security: :should:
* @author Tyson Malchow
*/
contract YesComplianceToken is YesComplianceTokenV1 {
uint64 private constant MAX_TOKENS_PER_ENTITY = 10240; // completely arbitrary limit
uint64 private constant MAX_ENTITIES = 2**32-1; // bc using 32 bit index tracking
uint64 private constant MAX_VALIDATORS_PER_MARK = 2**32-1; // bc using 32 bit index tracking
uint64 private constant TOTAL_YES_MARKS = 255; // bc 'uint8 yes'
// todo could shorten the entity IDs to anything 160+ to make this cheaper?
/** @notice a single YES attestation */
struct YesMark {
/** @notice ISO-3166-1 country codes */
uint16 countryCode;
/** @notice the possibly-country-speicifc YES being marked. */
uint8 yes;
// 8 bits more space in this slot.. could upgrade yes to uint16?
/** @notice the index of this mark in EntityRecord.yesMarks */
uint32 yesMarkIdx;
/** a list of the validator entities which have attested to this mark */
uint256[] validatorEntityIds;
/** @notice index of each validator entity ID in validatorEntityIds */
mapping(uint256 => uint32) validatorEntityIdIdx;
// uint8 entityListIdx;
}
/**
* tracks the state for a single recognized entity
*/
struct EntityRecord {
/** true marking this entity ID has been encountered */
bool init;
/** when true, this entity is effectively useless */
bool locked;
// 30 bits more space in this slot
/** position of the entityId in allEntityIds */
uint32 entityIdIdx;
/** used for creating reliable token IDs, monotonically increasing */
uint64 tokenIdCounter;
/** indexed YES mark lookups */
mapping(bytes4 => YesMark) yesMarkByKey;
/** raw collection of all marks keys */
bytes4[] yesMarkKeys;
/** all tokens associated with this identity */
uint256[] tokenIds;
// trellis/tower connection ?
// civic connection ?
// erc725/735 connection ?
}
/**
* @notice all fields we want to add per-token.
*
* there may never be more than just control flag, in which case it may make sense to collapse this
* to just a mapping(uint256 => bool) ?
*/
struct TokenRecord {
/** position of the tokenId in EntityRecord.tokenIds */
uint32 tokenIdIdx;
/** true if this token has administrative superpowers (aka is _not_ limited) */
bool control;
/** true if this token cannot move */
bool finalized;
// 30 bits more in this slot
// limitations: in/out?
}
address public ownerAddress;
mapping(uint256 => TokenRecord) public tokenRecordById;
mapping(uint256 => EntityRecord) public entityRecordById;
mapping(uint256 => uint256) public entityIdByTokenId;
/** for entity enumeration. maximum of 2^256-1 total entities (i think we'll be ok) */
uint256[] entityIds;
constructor() public {
/* this space intentionally left blank */
}
/**
* constructor alternative: first-time initialization the contract/token (required because of upgradeability)
*/
function initialize(string _name, string _symbol) {
// require(super._symbol.length == 0 || _symbol == super._symbol); // cannot change symbol after first init bc that could fuck shit up
_upgradeable_initialize(); // basically for security
super.initialize(_name, _symbol); // init token info
// grant the owner token
mint_I(ownerAddress, OWNER_ENTITY_ID, true);
// ecosystem owner gets both owner and validator marks (self-attested)
setYes_I(OWNER_ENTITY_ID, OWNER_ENTITY_ID, 0, YESMARK_OWNER);
setYes_I(OWNER_ENTITY_ID, OWNER_ENTITY_ID, 0, YESMARK_VALIDATOR);
}
/**
* executed in lieu of a constructor in a delegated context
*/
function _upgradeable_initialize() public {
super._upgradeable_initialize(); // provides require(msg.sender == _upgradeable_delegate_owner);
// some things are still tied to the owner (instead of the yesmark_owner :notsureif:)
ownerAddress = msg.sender;
}
// YesComplianceTokenV1 Interface Methods --------------------------------------------------------------------------
function isYes(uint256 _validatorEntityId, address _address, uint16 _countryCode, uint8 _yes) external view returns(bool) {
return isYes_I(_validatorEntityId, _address, _countryCode, _yes);
}
function requireYes(uint256 _validatorEntityId, address _address, uint16 _countryCode, uint8 _yes) external view {
require(isYes_I(_validatorEntityId, _address, _countryCode, _yes));
}
function getYes(uint256 _validatorEntityId, address _address, uint16 _countryCode) external view returns(uint8[] memory) {
if(balanceOf(_address) == 0)
return new uint8[](0);
uint256 entityId = entityIdByTokenId[tokenOfOwnerByIndex(_address, 0)];
EntityRecord storage e = entityRecordById[entityId];
uint256 j = 0;
uint256 i;
// locked always bails
if(e.locked)
return new uint8[](0);
uint8[] memory r = new uint8[](e.yesMarkKeys.length);
for(i = 0; i < e.yesMarkKeys.length; i++) {
YesMark storage m = e.yesMarkByKey[e.yesMarkKeys[i]];
// filter country code
if(m.countryCode != _countryCode)
continue;
// filter explicit validator entity
if(_validatorEntityId > 0
&& m.validatorEntityIdIdx[_validatorEntityId] == 0
&& (m.validatorEntityIds.length == 0 || m.validatorEntityIds[0] == _validatorEntityId))
continue;
// matched, chyess
r[j++] = m.yes;
}
// reduce array length
assembly { mstore(r, j) }
return r;
}
function mint(address _to, uint256 _entityId, bool _control) external returns (uint256) /* internally protected */{
uint256 callerTokenId = tokenOfOwnerByIndex(msg.sender, 0);
uint256 callerEntityId = entityIdByTokenId[callerTokenId];
// make sure caller has a control token, at the least
require(tokenRecordById[callerTokenId].control, 'control token required');
// determine/validate the entity being minted for
uint256 realEntityId;
if(_entityId == 0 || _entityId == callerEntityId) {
// unspecified entity, or caller entity, can do!
realEntityId = callerEntityId;
} else {
// otherwise make sure caller is a VALIDATOR, else fail
require(senderIsControlValidator(), 'illegal entity id'); // some duplicate checks/lookups, gas leak
realEntityId = _entityId;
}
return mint_I(_to, realEntityId, _control);
}
function mint(address _to, uint256 _entityId, bool _control, uint16 _countryCode, uint8[] _yes) external returns (uint256) /* internally protected */ {
// lazy warning: this is a 90% copy/paste job from the mint directly above this
uint256 callerTokenId = tokenOfOwnerByIndex(msg.sender, 0);
uint256 callerEntityId = entityIdByTokenId[callerTokenId];
// make sure caller has a control token, at the least
require(tokenRecordById[callerTokenId].control, 'control token required');
// determine/validate the entity being minted for
uint256 realEntityId;
if(_entityId == 0 || _entityId == callerEntityId) {
// unspecified entity, or caller entity, can do!
realEntityId = callerEntityId;
} else {
// otherwise make sure caller is a VALIDATOR, else fail
require(senderIsControlValidator()); // some duplicate checks/lookups, gas leak
realEntityId = _entityId;
}
// mint the coin
uint256 tokenId = mint_I(_to, realEntityId, _control);
// now set the attestations
require(_yes.length <= TOTAL_YES_MARKS); // safety
for(uint256 i = 0; i<_yes.length; i++) {
setYes_I(_entityId, _countryCode, _yes[i]);
}
return tokenId;
}
function getEntityId(address _address) external view returns (uint256) {
return entityIdByTokenId[tokenOfOwnerByIndex(_address, 0)];
}
function burn(uint256 _tokenId) external permission_control_tokenId(_tokenId) {
uint256 entityId = entityIdByTokenId[_tokenId];
EntityRecord storage e = entity(entityId);
TokenRecord storage t = tokenRecordById[_tokenId];
// remove token from entity
e.tokenIds[t.tokenIdIdx] = e.tokenIds[e.tokenIds.length - 1];
e.tokenIds.length--;
// update tracked index (of swapped, if present)
if(e.tokenIds.length > t.tokenIdIdx)
tokenRecordById[e.tokenIds[t.tokenIdIdx]].tokenIdIdx = t.tokenIdIdx;
// remove token record
delete tokenRecordById[_tokenId];
// burn the actual token
super._burn(tokenOwner[_tokenId], _tokenId);
}
function burnEntity(uint256 _entityId) external permission_control_entityId(_entityId) { // self-burn allowed
EntityRecord storage e = entity(_entityId);
// burn all the tokens
for(uint256 i = 0; i < e.tokenIds.length; i++) {
uint256 tokenId = e.tokenIds[i];
super._burn(tokenOwner[tokenId], tokenId);
}
// clear all the marks
clearYes_I(_entityId);
// clear out entity record
e.init = false;
e.locked = false;
e.entityIdIdx = 0;
e.tokenIdCounter = 0;
assert(e.yesMarkKeys.length == 0);
assert(e.tokenIds.length == 0);
}
function setYes(uint256 _entityId, uint16 _countryCode, uint8 _yes) external permission_validator {
setYes_I(_entityId, _countryCode, _yes);
}
function clearYes(uint256 _entityId, uint16 _countryCode, uint8 _yes) external permission_validator {
require(_yes > 0);
require(_yes != 128);
// special check against reserved country code 0
if(_countryCode == 0)
require(senderIsEcosystemControl(), 'not authorized as ecosystem control'); // this is duplicating some things, gas leak
EntityRecord storage e = entity(_entityId);
uint256 callerTokenId = tokenOfOwnerByIndex(msg.sender, 0);
uint256 callerEntityId = entityIdByTokenId[callerTokenId];
bytes4 key = yesKey(_countryCode, _yes);
YesMark storage mark = e.yesMarkByKey[key];
if(mark.yes == 0)
return; // not set by anyone, bail happily
if(mark.validatorEntityIdIdx[callerEntityId] == 0 &&
(mark.validatorEntityIds.length == 0 || mark.validatorEntityIds[0] != callerEntityId)) {
// set, but not by this validator, bail happily
return;
}
clearYes_I(mark, e, callerEntityId);
}
function clearYes(uint256 _entityId, uint16 _countryCode) external permission_validator {
// special check against 129 validator mark
if(_countryCode == 0)
require(senderIsEcosystemControl(), 'not authorized as ecosystem control (129)'); // this is duplicating some things, gas leak
EntityRecord storage e = entity(_entityId);
uint256 callerTokenId = tokenOfOwnerByIndex(msg.sender, 0);
uint256 callerEntityId = entityIdByTokenId[callerTokenId];
uint256 i;
for(i =0; i<e.yesMarkKeys.length; i++) {
YesMark storage mark = e.yesMarkByKey[e.yesMarkKeys[i]];
if(mark.countryCode != _countryCode)
continue;
if(mark.validatorEntityIdIdx[callerEntityId] == 0 &&
(mark.validatorEntityIds.length == 0 || mark.validatorEntityIds[0] != callerEntityId)) {
// set, but not by this validator, skip
continue;
}
if(clearYes_I(mark, e, callerEntityId)) {
// mark was fully destroyed (and replaced in e.yesMarkKeys with the last one)
i--;
}
}
}
function clearYes(uint256 _entityId) external permission_validator {
clearYes_I(_entityId);
}
function setLocked(uint256 _entityId, bool _lock) external permission_validator {
EntityRecord storage e = entity(_entityId);
// can't fux with owner lock
require(_entityId != OWNER_ENTITY_ID);
// if caller isn't ecosystem control, cannot target other validators
if(!senderIsEcosystemControl())
require(e.yesMarkByKey[yesKey(0, YESMARK_VALIDATOR)].yes == 0);
// lockzz
e.locked = _lock;
}
function isLocked(uint256 _entityId) external view returns (bool) {
return entity(_entityId).locked;
}
function isFinalized(uint256 _tokenId) external view returns (bool) {
return tokenRecordById[_tokenId].finalized;
}
function finalize(uint256 _tokenId) external permission_access_tokenId(_tokenId) {
TokenRecord storage t = tokenRecordById[_tokenId];
t.finalized = true;
}
// Internal Methods ------------------------------------------------------------------------------------------------
function clearYes_I(YesMark storage mark, EntityRecord storage e, uint256 validatorEntityId) internal returns(bool) {
uint32 idx = mark.validatorEntityIdIdx[validatorEntityId];
mark.validatorEntityIds[idx] = mark.validatorEntityIds[mark.validatorEntityIds.length - 1];
mark.validatorEntityIds.length--;
delete mark.validatorEntityIdIdx[validatorEntityId];
// remap
if(mark.validatorEntityIds.length > idx)
mark.validatorEntityIdIdx[mark.validatorEntityIds[idx]] = idx;
// check if the entire mark needs deleting
if(mark.validatorEntityIds.length == 0) {
// yes, it does. swap/delete
idx = mark.yesMarkIdx;
e.yesMarkKeys[idx] = e.yesMarkKeys[e.yesMarkKeys.length - 1];
e.yesMarkKeys.length--;
// remap
if(e.yesMarkKeys.length > idx)
e.yesMarkByKey[e.yesMarkKeys[idx]].yesMarkIdx = idx;
// delete mark
mark.countryCode = 0;
mark.yes = 0;
mark.yesMarkIdx = 0;
// assert(mark.validatorEntityIds.length == 0);
return true;
}
return false;
}
function clearYes_I(uint256 _entityId) internal {
require(_entityId != OWNER_ENTITY_ID);
EntityRecord storage e = entity(_entityId);
// only ecosystem control can touch validators
if(!senderIsEcosystemControl())
require(e.yesMarkByKey[yesKey(0, YESMARK_VALIDATOR)].yes == 0);
uint256 callerTokenId = tokenOfOwnerByIndex(msg.sender, 0);
uint256 callerEntityId = entityIdByTokenId[callerTokenId];
uint256 i;
for(i =0; i<e.yesMarkKeys.length; i++) {
YesMark storage mark = e.yesMarkByKey[e.yesMarkKeys[i]];
if(mark.validatorEntityIdIdx[callerEntityId] == 0 &&
(mark.validatorEntityIds.length == 0 || mark.validatorEntityIds[0] != callerEntityId)) {
// set, but not by this validator
continue;
}
if(clearYes_I(mark, e, callerEntityId)) {
// mark was fully destroyed (and replaced in e.yesMarkKeys with the last one)
i--;
}
}
}
function isYes_I(uint256 _validatorEntityId, address _address, uint16 _countryCode, uint8 _yes) internal view returns(bool) {
if(balanceOf(_address) == 0)
return false;
uint256 entityId = entityIdByTokenId[tokenOfOwnerByIndex(_address, 0)];
EntityRecord storage e = entityRecordById[entityId];
// locked always bails
if(e.locked)
return false;
// gate out definite nos
YesMark storage m = e.yesMarkByKey[yesKey(_countryCode, _yes)];
if(m.yes == 0)
return false;
// no specific validators, we good
if(_validatorEntityId == 0)
return true;
// filter by validator
return m.validatorEntityIdIdx[_validatorEntityId] > 0
|| m.validatorEntityIds.length > 0 && m.validatorEntityIds[0] == _validatorEntityId;
}
function setYes_I(uint256 _entityId, uint16 _countryCode, uint8 _yes) internal {
require(_yes > 0);
require(_yes != 128);
// special check against 129 validator mark
if(_yes == 129)
require(senderIsEcosystemControl()); // this is duplicating some checks, gas leak
uint256 callerTokenId = tokenOfOwnerByIndex(msg.sender, 0);
uint256 callerEntityId = entityIdByTokenId[callerTokenId];
setYes_I(callerEntityId, _entityId, _countryCode, _yes);
}
function setYes_I(uint256 _validatorEntityId, uint256 _entityId, uint16 _countryCode, uint8 _yes) internal {
// assert(_yes > 0);
EntityRecord storage targetEntity = entity(_entityId);
// locate existing mark
bytes4 key = yesKey(_countryCode, _yes);
YesMark storage mark = targetEntity.yesMarkByKey[key];
if(mark.yes == 0) {
require(targetEntity.yesMarkKeys.length < TOTAL_YES_MARKS);
// new mark on the entity
mark.countryCode = _countryCode;
mark.yes = _yes;
mark.yesMarkIdx = uint32(targetEntity.yesMarkKeys.length);
targetEntity.yesMarkKeys.push(key);
} else if(mark.validatorEntityIdIdx[_validatorEntityId] > 0 ||
(mark.validatorEntityIds.length > 0 && mark.validatorEntityIds[0] == _validatorEntityId)) {
// existing mark and the caller is already on it
/*
i'm inclined to make it do nothing in this case (instead of failing) since i'm not at this point positive how best
to distinguish error types to a caller, which would be required for a caller to know wtf to do in this case
(otherwise they need to query blockchain again)
(but that costs gas... :notsureif:)
*/
return;
}
require(mark.validatorEntityIds.length < MAX_VALIDATORS_PER_MARK);
// add this validator to the mark
mark.validatorEntityIdIdx[_validatorEntityId] = uint32(mark.validatorEntityIds.length);
mark.validatorEntityIds.push(_validatorEntityId);
}
/** non-permissed internal minting impl */
function mint_I(address _to, uint256 _entityId, bool _control) internal returns (uint256) {
EntityRecord storage e = entity(_entityId);
require(e.tokenIds.length < MAX_TOKENS_PER_ENTITY, 'token limit reached');
require(e.tokenIdCounter < 2**64-1); // kind of ridiculous but whatever, safety first!
uint256 tokenId = uint256(keccak256(abi.encodePacked(_entityId, e.tokenIdCounter++)));
super._mint(_to, tokenId);
tokenRecordById[tokenId].tokenIdIdx = uint32(e.tokenIds.length);
tokenRecordById[tokenId].control = _control;
e.tokenIds.push(tokenId);
entityIdByTokenId[tokenId] = _entityId;
return tokenId;
}
/** entity resolution (creation when needed) */
function entity(uint256 _entityId) internal returns (EntityRecord storage) {
require(_entityId > 0);
EntityRecord storage e = entityRecordById[_entityId];
if(e.init) return e;
require(entityIds.length < MAX_ENTITIES);
e.init = true;
e.entityIdIdx = uint32(entityIds.length);
entityIds.push(_entityId);
return e;
}
/** override default addTokenTo for additional transaction limitations */
function addTokenTo(address _to, uint256 _tokenId) internal {
uint256 entityId = entityIdByTokenId[_tokenId];
// ensure one owner cannot be associated with multiple entities
// NOTE: this breaks hotwallet integrations, at this point necessarily so
if(balanceOf(_to) > 0) {
uint256 prevEntityId = entityIdByTokenId[tokenOfOwnerByIndex(_to, 0)];
require(prevEntityId == entityId, 'conflicting entities');
}
require(!tokenRecordById[_tokenId].finalized, 'token is finalized');
super.addTokenTo(_to, _tokenId);
}
/** the sender is the same entity as the one specified */
function senderIsEntity_ByEntityId(uint256 _entityId) internal view returns (bool) {
return _entityId == entityIdByTokenId[tokenOfOwnerByIndex(msg.sender, 0)];
}
/** the sender is the same entity as the one specified, and the sender is a control for that entity */
function senderIsControl_ByEntityId(uint256 _entityId) internal view returns (bool) {
if(balanceOf(msg.sender) == 0)
return false;
uint256 tokenId = tokenOfOwnerByIndex(msg.sender, 0);
uint256 senderEntityId = entityIdByTokenId[tokenId];
return _entityId == senderEntityId && tokenRecordById[tokenId].control;
}
/** the sender is a non-locked validator via control token */
function senderIsControlValidator() internal view returns (bool) {
if(balanceOf(msg.sender) == 0)
return false;
uint256 tokenId = tokenOfOwnerByIndex(msg.sender, 0);
uint256 senderEntityId = entityIdByTokenId[tokenId];
EntityRecord storage e = entityRecordById[senderEntityId];
return tokenRecordById[tokenId].control
&& !e.locked
&& entityRecordById[senderEntityId].yesMarkByKey[yesKey(0, YESMARK_VALIDATOR)].yes > 0;
}
/** the sender is the same entity as the one tied to the token specified */
function senderIsEntity_ByTokenId(uint256 _tokenId) internal view returns (bool) {
if(balanceOf(msg.sender) == 0)
return false;
return entityIdByTokenId[_tokenId] == entityIdByTokenId[tokenOfOwnerByIndex(msg.sender, 0)];
}
/** the sender is the same entity as the one tied to the token specified, and the sender is a control for that entity */
function senderIsControl_ByTokenId(uint256 _tokenId) internal view returns (bool) {
if(balanceOf(msg.sender) == 0)
return false;
uint256 senderEntityId = entityIdByTokenId[tokenOfOwnerByIndex(msg.sender, 0)];
return entityIdByTokenId[_tokenId] == senderEntityId && tokenRecordById[_tokenId].control;
}
/** checks if sender is the singular ecosystem owner */
function senderIsEcosystemControl() internal view returns (bool) {
// todo deprecate ownerAddress ?!
return msg.sender == ownerAddress || senderIsControl_ByEntityId(OWNER_ENTITY_ID);
}
/** a key for a YES attestation mark */
function yesKey(uint16 _countryCode, uint8 _yes) internal pure returns(bytes4) {
return bytes4(keccak256(abi.encodePacked(_countryCode, _yes)));
}
// PERMISSIONS MODIFIERS ----------------------------------------------------------------
modifier permission_validator {
require(senderIsControlValidator(), 'not authorized as validator');
_;
}
modifier permission_super {
require(senderIsEcosystemControl(), 'not authorized as ecosystem control');
_;
}
// modifier permission_access_entityId(uint256 _entityId) {
// require(senderIsEcosystemControl() || senderIsEntity_ByEntityId(_entityId));
// _;
// }
modifier permission_control_entityId(uint256 _entityId) {
require(senderIsEcosystemControl() || senderIsControl_ByEntityId(_entityId), 'not authorized entity controller');
_;
}
modifier permission_access_tokenId(uint256 _tokenId) {
require(senderIsEcosystemControl() || senderIsEntity_ByTokenId(_tokenId));
_;
}
modifier permission_control_tokenId(uint256 _tokenId) {
require(senderIsEcosystemControl() || senderIsControl_ByTokenId(_tokenId), 'not authorized token controller');
_;
}
}
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