Overview
Max Total Supply
710,112.8108 TIME
Holders
4,027 (0.00%)
Total Transfers
-
Market
Onchain Market Cap
$0.00
Circulating Supply Market Cap
-
Other Info
Token Contract (WITH 8 Decimals)
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Contract Name:
ChronoBankAssetProxy
Compiler Version
v0.4.8+commit.60cc1668
Optimization Enabled:
Yes with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity)
/** *Submitted for verification at Etherscan.io on 2018-03-06 */ pragma solidity ^0.4.4; contract Owned { address public contractOwner; address public pendingContractOwner; function Owned() { contractOwner = msg.sender; } modifier onlyContractOwner() { if (contractOwner == msg.sender) { _; } } /** * Prepares ownership pass. * * Can only be called by current owner. * * @param _to address of the next owner. * * @return success. */ function changeContractOwnership(address _to) onlyContractOwner() returns(bool) { pendingContractOwner = _to; return true; } /** * Finalize ownership pass. * * Can only be called by pending owner. * * @return success. */ function claimContractOwnership() returns(bool) { if (pendingContractOwner != msg.sender) { return false; } contractOwner = pendingContractOwner; delete pendingContractOwner; return true; } } contract Emitter { function emitTransfer(address _from, address _to, bytes32 _symbol, uint _value, string _reference); function emitIssue(bytes32 _symbol, uint _value, address _by); function emitRevoke(bytes32 _symbol, uint _value, address _by); function emitOwnershipChange(address _from, address _to, bytes32 _symbol); function emitApprove(address _from, address _spender, bytes32 _symbol, uint _value); function emitRecovery(address _from, address _to, address _by); function emitError(bytes32 _message); } contract Proxy { function emitTransfer(address _from, address _to, uint _value); function emitApprove(address _from, address _spender, uint _value); } /** * @title ChronoBank Platform. * * The official ChronoBank assets platform powering TIME and LHT tokens, and possibly * other unknown tokens needed later. * Platform uses EventsHistory contract to keep events, so that in case it needs to be redeployed * at some point, all the events keep appearing at the same place. * * Every asset is meant to be used through a proxy contract. Only one proxy contract have access * rights for a particular asset. * * Features: transfers, allowances, supply adjustments, lost wallet access recovery. * * Note: all the non constant functions return false instead of throwing in case if state change * didn't happen yet. */ contract ChronoBankPlatform is Owned { // Structure of a particular asset. struct Asset { uint owner; // Asset's owner id. uint totalSupply; // Asset's total supply. string name; // Asset's name, for information purposes. string description; // Asset's description, for information purposes. bool isReissuable; // Indicates if asset have dynamic of fixed supply. uint8 baseUnit; // Proposed number of decimals. mapping(uint => Wallet) wallets; // Holders wallets. } // Structure of an asset holder wallet for particular asset. struct Wallet { uint balance; mapping(uint => uint) allowance; } // Structure of an asset holder. struct Holder { address addr; // Current address of the holder. mapping(address => bool) trust; // Addresses that are trusted with recovery proocedure. } // Iterable mapping pattern is used for holders. uint public holdersCount; mapping(uint => Holder) public holders; // This is an access address mapping. Many addresses may have access to a single holder. mapping(address => uint) holderIndex; // Asset symbol to asset mapping. mapping(bytes32 => Asset) public assets; // Asset symbol to asset proxy mapping. mapping(bytes32 => address) public proxies; // Should use interface of the emitter, but address of events history. Emitter public eventsHistory; /** * Emits Error event with specified error message. * * Should only be used if no state changes happened. * * @param _message error message. */ function _error(bytes32 _message) internal { eventsHistory.emitError(_message); } /** * Sets EventsHstory contract address. * * Can be set only once, and only by contract owner. * * @param _eventsHistory EventsHistory contract address. * * @return success. */ function setupEventsHistory(address _eventsHistory) onlyContractOwner() returns(bool) { if (address(eventsHistory) != 0) { return false; } eventsHistory = Emitter(_eventsHistory); return true; } /** * Emits Error if called not by asset owner. */ modifier onlyOwner(bytes32 _symbol) { if (isOwner(msg.sender, _symbol)) { _; } else { _error("Only owner: access denied"); } } /** * Emits Error if called not by asset proxy. */ modifier onlyProxy(bytes32 _symbol) { if (proxies[_symbol] == msg.sender) { _; } else { _error("Only proxy: access denied"); } } /** * Emits Error if _from doesn't trust _to. */ modifier checkTrust(address _from, address _to) { if (isTrusted(_from, _to)) { _; } else { _error("Only trusted: access denied"); } } /** * Check asset existance. * * @param _symbol asset symbol. * * @return asset existance. */ function isCreated(bytes32 _symbol) constant returns(bool) { return assets[_symbol].owner != 0; } /** * Returns asset decimals. * * @param _symbol asset symbol. * * @return asset decimals. */ function baseUnit(bytes32 _symbol) constant returns(uint8) { return assets[_symbol].baseUnit; } /** * Returns asset name. * * @param _symbol asset symbol. * * @return asset name. */ function name(bytes32 _symbol) constant returns(string) { return assets[_symbol].name; } /** * Returns asset description. * * @param _symbol asset symbol. * * @return asset description. */ function description(bytes32 _symbol) constant returns(string) { return assets[_symbol].description; } /** * Returns asset reissuability. * * @param _symbol asset symbol. * * @return asset reissuability. */ function isReissuable(bytes32 _symbol) constant returns(bool) { return assets[_symbol].isReissuable; } /** * Returns asset owner address. * * @param _symbol asset symbol. * * @return asset owner address. */ function owner(bytes32 _symbol) constant returns(address) { return holders[assets[_symbol].owner].addr; } /** * Check if specified address has asset owner rights. * * @param _owner address to check. * @param _symbol asset symbol. * * @return owner rights availability. */ function isOwner(address _owner, bytes32 _symbol) constant returns(bool) { return isCreated(_symbol) && (assets[_symbol].owner == getHolderId(_owner)); } /** * Returns asset total supply. * * @param _symbol asset symbol. * * @return asset total supply. */ function totalSupply(bytes32 _symbol) constant returns(uint) { return assets[_symbol].totalSupply; } /** * Returns asset balance for a particular holder. * * @param _holder holder address. * @param _symbol asset symbol. * * @return holder balance. */ function balanceOf(address _holder, bytes32 _symbol) constant returns(uint) { return _balanceOf(getHolderId(_holder), _symbol); } /** * Returns asset balance for a particular holder id. * * @param _holderId holder id. * @param _symbol asset symbol. * * @return holder balance. */ function _balanceOf(uint _holderId, bytes32 _symbol) constant returns(uint) { return assets[_symbol].wallets[_holderId].balance; } /** * Returns current address for a particular holder id. * * @param _holderId holder id. * * @return holder address. */ function _address(uint _holderId) constant returns(address) { return holders[_holderId].addr; } /** * Sets Proxy contract address for a particular asset. * * Can be set only once for each asset, and only by contract owner. * * @param _address Proxy contract address. * @param _symbol asset symbol. * * @return success. */ function setProxy(address _address, bytes32 _symbol) onlyContractOwner() returns(bool) { if (proxies[_symbol] != 0x0) { return false; } proxies[_symbol] = _address; return true; } /** * Transfers asset balance between holders wallets. * * @param _fromId holder id to take from. * @param _toId holder id to give to. * @param _value amount to transfer. * @param _symbol asset symbol. */ function _transferDirect(uint _fromId, uint _toId, uint _value, bytes32 _symbol) internal { assets[_symbol].wallets[_fromId].balance -= _value; assets[_symbol].wallets[_toId].balance += _value; } /** * Transfers asset balance between holders wallets. * * Performs sanity checks and takes care of allowances adjustment. * * @param _fromId holder id to take from. * @param _toId holder id to give to. * @param _value amount to transfer. * @param _symbol asset symbol. * @param _reference transfer comment to be included in a Transfer event. * @param _senderId transfer initiator holder id. * * @return success. */ function _transfer(uint _fromId, uint _toId, uint _value, bytes32 _symbol, string _reference, uint _senderId) internal returns(bool) { // Should not allow to send to oneself. if (_fromId == _toId) { _error("Cannot send to oneself"); return false; } // Should have positive value. if (_value == 0) { _error("Cannot send 0 value"); return false; } // Should have enough balance. if (_balanceOf(_fromId, _symbol) < _value) { _error("Insufficient balance"); return false; } // Should have enough allowance. if (_fromId != _senderId && _allowance(_fromId, _senderId, _symbol) < _value) { _error("Not enough allowance"); return false; } _transferDirect(_fromId, _toId, _value, _symbol); // Adjust allowance. if (_fromId != _senderId) { assets[_symbol].wallets[_fromId].allowance[_senderId] -= _value; } // Internal Out Of Gas/Throw: revert this transaction too; // Call Stack Depth Limit reached: n/a after HF 4; // Recursive Call: safe, all changes already made. eventsHistory.emitTransfer(_address(_fromId), _address(_toId), _symbol, _value, _reference); _proxyTransferEvent(_fromId, _toId, _value, _symbol); return true; } /** * Transfers asset balance between holders wallets. * * Can only be called by asset proxy. * * @param _to holder address to give to. * @param _value amount to transfer. * @param _symbol asset symbol. * @param _reference transfer comment to be included in a Transfer event. * @param _sender transfer initiator address. * * @return success. */ function proxyTransferWithReference(address _to, uint _value, bytes32 _symbol, string _reference, address _sender) onlyProxy(_symbol) returns(bool) { return _transfer(getHolderId(_sender), _createHolderId(_to), _value, _symbol, _reference, getHolderId(_sender)); } /** * Ask asset Proxy contract to emit ERC20 compliant Transfer event. * * @param _fromId holder id to take from. * @param _toId holder id to give to. * @param _value amount to transfer. * @param _symbol asset symbol. */ function _proxyTransferEvent(uint _fromId, uint _toId, uint _value, bytes32 _symbol) internal { if (proxies[_symbol] != 0x0) { // Internal Out Of Gas/Throw: revert this transaction too; // Call Stack Depth Limit reached: n/a after HF 4; // Recursive Call: safe, all changes already made. Proxy(proxies[_symbol]).emitTransfer(_address(_fromId), _address(_toId), _value); } } /** * Returns holder id for the specified address. * * @param _holder holder address. * * @return holder id. */ function getHolderId(address _holder) constant returns(uint) { return holderIndex[_holder]; } /** * Returns holder id for the specified address, creates it if needed. * * @param _holder holder address. * * @return holder id. */ function _createHolderId(address _holder) internal returns(uint) { uint holderId = holderIndex[_holder]; if (holderId == 0) { holderId = ++holdersCount; holders[holderId].addr = _holder; holderIndex[_holder] = holderId; } return holderId; } /** * Issues new asset token on the platform. * * Tokens issued with this call go straight to contract owner. * Each symbol can be issued only once, and only by contract owner. * * @param _symbol asset symbol. * @param _value amount of tokens to issue immediately. * @param _name name of the asset. * @param _description description for the asset. * @param _baseUnit number of decimals. * @param _isReissuable dynamic or fixed supply. * * @return success. */ function issueAsset(bytes32 _symbol, uint _value, string _name, string _description, uint8 _baseUnit, bool _isReissuable) onlyContractOwner() returns(bool) { // Should have positive value if supply is going to be fixed. if (_value == 0 && !_isReissuable) { _error("Cannot issue 0 value fixed asset"); return false; } // Should not be issued yet. if (isCreated(_symbol)) { _error("Asset already issued"); return false; } uint holderId = _createHolderId(msg.sender); assets[_symbol] = Asset(holderId, _value, _name, _description, _isReissuable, _baseUnit); assets[_symbol].wallets[holderId].balance = _value; // Internal Out Of Gas/Throw: revert this transaction too; // Call Stack Depth Limit reached: n/a after HF 4; // Recursive Call: safe, all changes already made. eventsHistory.emitIssue(_symbol, _value, _address(holderId)); return true; } /** * Issues additional asset tokens if the asset have dynamic supply. * * Tokens issued with this call go straight to asset owner. * Can only be called by asset owner. * * @param _symbol asset symbol. * @param _value amount of additional tokens to issue. * * @return success. */ function reissueAsset(bytes32 _symbol, uint _value) onlyOwner(_symbol) returns(bool) { // Should have positive value. if (_value == 0) { _error("Cannot reissue 0 value"); return false; } Asset asset = assets[_symbol]; // Should have dynamic supply. if (!asset.isReissuable) { _error("Cannot reissue fixed asset"); return false; } // Resulting total supply should not overflow. if (asset.totalSupply + _value < asset.totalSupply) { _error("Total supply overflow"); return false; } uint holderId = getHolderId(msg.sender); asset.wallets[holderId].balance += _value; asset.totalSupply += _value; // Internal Out Of Gas/Throw: revert this transaction too; // Call Stack Depth Limit reached: n/a after HF 4; // Recursive Call: safe, all changes already made. eventsHistory.emitIssue(_symbol, _value, _address(holderId)); _proxyTransferEvent(0, holderId, _value, _symbol); return true; } /** * Destroys specified amount of senders asset tokens. * * @param _symbol asset symbol. * @param _value amount of tokens to destroy. * * @return success. */ function revokeAsset(bytes32 _symbol, uint _value) returns(bool) { // Should have positive value. if (_value == 0) { _error("Cannot revoke 0 value"); return false; } Asset asset = assets[_symbol]; uint holderId = getHolderId(msg.sender); // Should have enough tokens. if (asset.wallets[holderId].balance < _value) { _error("Not enough tokens to revoke"); return false; } asset.wallets[holderId].balance -= _value; asset.totalSupply -= _value; // Internal Out Of Gas/Throw: revert this transaction too; // Call Stack Depth Limit reached: n/a after HF 4; // Recursive Call: safe, all changes already made. eventsHistory.emitRevoke(_symbol, _value, _address(holderId)); _proxyTransferEvent(holderId, 0, _value, _symbol); return true; } /** * Passes asset ownership to specified address. * * Only ownership is changed, balances are not touched. * Can only be called by asset owner. * * @param _symbol asset symbol. * @param _newOwner address to become a new owner. * * @return success. */ function changeOwnership(bytes32 _symbol, address _newOwner) onlyOwner(_symbol) returns(bool) { Asset asset = assets[_symbol]; uint newOwnerId = _createHolderId(_newOwner); // Should pass ownership to another holder. if (asset.owner == newOwnerId) { _error("Cannot pass ownership to oneself"); return false; } address oldOwner = _address(asset.owner); asset.owner = newOwnerId; // Internal Out Of Gas/Throw: revert this transaction too; // Call Stack Depth Limit reached: n/a after HF 4; // Recursive Call: safe, all changes already made. eventsHistory.emitOwnershipChange(oldOwner, _address(newOwnerId), _symbol); return true; } /** * Check if specified holder trusts an address with recovery procedure. * * @param _from truster. * @param _to trustee. * * @return trust existance. */ function isTrusted(address _from, address _to) constant returns(bool) { return holders[getHolderId(_from)].trust[_to]; } /** * Trust an address to perform recovery procedure for the caller. * * @param _to trustee. * * @return success. */ function trust(address _to) returns(bool) { uint fromId = _createHolderId(msg.sender); // Should trust to another address. if (fromId == getHolderId(_to)) { _error("Cannot trust to oneself"); return false; } // Should trust to yet untrusted. if (isTrusted(msg.sender, _to)) { _error("Already trusted"); return false; } holders[fromId].trust[_to] = true; return true; } /** * Revoke trust to perform recovery procedure from an address. * * @param _to trustee. * * @return success. */ function distrust(address _to) checkTrust(msg.sender, _to) returns(bool) { holders[getHolderId(msg.sender)].trust[_to] = false; return true; } /** * Perform recovery procedure. * * This function logic is actually more of an addAccess(uint _holderId, address _to). * It grants another address access to recovery subject wallets. * Can only be called by trustee of recovery subject. * * @param _from holder address to recover from. * @param _to address to grant access to. * * @return success. */ function recover(address _from, address _to) checkTrust(_from, msg.sender) returns(bool) { // Should recover to previously unused address. if (getHolderId(_to) != 0) { _error("Should recover to new address"); return false; } // We take current holder address because it might not equal _from. // It is possible to recover from any old holder address, but event should have the current one. address from = holders[getHolderId(_from)].addr; holders[getHolderId(_from)].addr = _to; holderIndex[_to] = getHolderId(_from); // Internal Out Of Gas/Throw: revert this transaction too; // Call Stack Depth Limit reached: revert this transaction too; // Recursive Call: safe, all changes already made. eventsHistory.emitRecovery(from, _to, msg.sender); return true; } /** * Sets asset spending allowance for a specified spender. * * Note: to revoke allowance, one needs to set allowance to 0. * * @param _spenderId holder id to set allowance for. * @param _value amount to allow. * @param _symbol asset symbol. * @param _senderId approve initiator holder id. * * @return success. */ function _approve(uint _spenderId, uint _value, bytes32 _symbol, uint _senderId) internal returns(bool) { // Asset should exist. if (!isCreated(_symbol)) { _error("Asset is not issued"); return false; } // Should allow to another holder. if (_senderId == _spenderId) { _error("Cannot approve to oneself"); return false; } assets[_symbol].wallets[_senderId].allowance[_spenderId] = _value; // Internal Out Of Gas/Throw: revert this transaction too; // Call Stack Depth Limit reached: revert this transaction too; // Recursive Call: safe, all changes already made. eventsHistory.emitApprove(_address(_senderId), _address(_spenderId), _symbol, _value); if (proxies[_symbol] != 0x0) { // Internal Out Of Gas/Throw: revert this transaction too; // Call Stack Depth Limit reached: n/a after HF 4; // Recursive Call: safe, all changes already made. Proxy(proxies[_symbol]).emitApprove(_address(_senderId), _address(_spenderId), _value); } return true; } /** * Sets asset spending allowance for a specified spender. * * Can only be called by asset proxy. * * @param _spender holder address to set allowance to. * @param _value amount to allow. * @param _symbol asset symbol. * @param _sender approve initiator address. * * @return success. */ function proxyApprove(address _spender, uint _value, bytes32 _symbol, address _sender) onlyProxy(_symbol) returns(bool) { return _approve(_createHolderId(_spender), _value, _symbol, _createHolderId(_sender)); } /** * Returns asset allowance from one holder to another. * * @param _from holder that allowed spending. * @param _spender holder that is allowed to spend. * @param _symbol asset symbol. * * @return holder to spender allowance. */ function allowance(address _from, address _spender, bytes32 _symbol) constant returns(uint) { return _allowance(getHolderId(_from), getHolderId(_spender), _symbol); } /** * Returns asset allowance from one holder to another. * * @param _fromId holder id that allowed spending. * @param _toId holder id that is allowed to spend. * @param _symbol asset symbol. * * @return holder to spender allowance. */ function _allowance(uint _fromId, uint _toId, bytes32 _symbol) constant internal returns(uint) { return assets[_symbol].wallets[_fromId].allowance[_toId]; } /** * Prforms allowance transfer of asset balance between holders wallets. * * Can only be called by asset proxy. * * @param _from holder address to take from. * @param _to holder address to give to. * @param _value amount to transfer. * @param _symbol asset symbol. * @param _reference transfer comment to be included in a Transfer event. * @param _sender allowance transfer initiator address. * * @return success. */ function proxyTransferFromWithReference(address _from, address _to, uint _value, bytes32 _symbol, string _reference, address _sender) onlyProxy(_symbol) returns(bool) { return _transfer(getHolderId(_from), _createHolderId(_to), _value, _symbol, _reference, getHolderId(_sender)); } } contract ChronoBankAsset { function __transferWithReference(address _to, uint _value, string _reference, address _sender) returns(bool); function __transferFromWithReference(address _from, address _to, uint _value, string _reference, address _sender) returns(bool); function __approve(address _spender, uint _value, address _sender) returns(bool); function __process(bytes _data, address _sender) payable { throw; } } contract ERC20 { event Transfer(address indexed from, address indexed to, uint256 value); event Approval(address indexed from, address indexed spender, uint256 value); function totalSupply() constant returns (uint256 supply); function balanceOf(address _owner) constant returns (uint256 balance); function transfer(address _to, uint256 _value) returns (bool success); function transferFrom(address _from, address _to, uint256 _value) returns (bool success); function approve(address _spender, uint256 _value) returns (bool success); function allowance(address _owner, address _spender) constant returns (uint256 remaining); } contract ChronoBankAssetProxy is ERC20 { // Assigned platform, immutable. ChronoBankPlatform public chronoBankPlatform; // Assigned symbol, immutable. bytes32 smbl; // Assigned name, immutable. string public name; string public symbol; /** * Sets platform address, assigns symbol and name. * * Can be set only once. * * @param _chronoBankPlatform platform contract address. * @param _symbol assigned symbol. * @param _name assigned name. * * @return success. */ function init(ChronoBankPlatform _chronoBankPlatform, string _symbol, string _name) returns(bool) { if (address(chronoBankPlatform) != 0x0) { return false; } chronoBankPlatform = _chronoBankPlatform; symbol = _symbol; smbl = stringToBytes32(_symbol); name = _name; return true; } function stringToBytes32(string memory source) returns (bytes32 result) { assembly { result := mload(add(source, 32)) } } /** * Only platform is allowed to call. */ modifier onlyChronoBankPlatform() { if (msg.sender == address(chronoBankPlatform)) { _; } } /** * Only current asset owner is allowed to call. */ modifier onlyAssetOwner() { if (chronoBankPlatform.isOwner(msg.sender, smbl)) { _; } } /** * Returns asset implementation contract for current caller. * * @return asset implementation contract. */ function _getAsset() internal returns(ChronoBankAsset) { return ChronoBankAsset(getVersionFor(msg.sender)); } /** * Returns asset total supply. * * @return asset total supply. */ function totalSupply() constant returns(uint) { return chronoBankPlatform.totalSupply(smbl); } /** * Returns asset balance for a particular holder. * * @param _owner holder address. * * @return holder balance. */ function balanceOf(address _owner) constant returns(uint) { return chronoBankPlatform.balanceOf(_owner, smbl); } /** * Returns asset allowance from one holder to another. * * @param _from holder that allowed spending. * @param _spender holder that is allowed to spend. * * @return holder to spender allowance. */ function allowance(address _from, address _spender) constant returns(uint) { return chronoBankPlatform.allowance(_from, _spender, smbl); } /** * Returns asset decimals. * * @return asset decimals. */ function decimals() constant returns(uint8) { return chronoBankPlatform.baseUnit(smbl); } /** * Transfers asset balance from the caller to specified receiver. * * @param _to holder address to give to. * @param _value amount to transfer. * * @return success. */ function transfer(address _to, uint _value) returns(bool) { return _transferWithReference(_to, _value, ""); } /** * Transfers asset balance from the caller to specified receiver adding specified comment. * * @param _to holder address to give to. * @param _value amount to transfer. * @param _reference transfer comment to be included in a platform's Transfer event. * * @return success. */ function transferWithReference(address _to, uint _value, string _reference) returns(bool) { return _transferWithReference(_to, _value, _reference); } /** * Resolves asset implementation contract for the caller and forwards there arguments along with * the caller address. * * @return success. */ function _transferWithReference(address _to, uint _value, string _reference) internal returns(bool) { return _getAsset().__transferWithReference(_to, _value, _reference, msg.sender); } /** * Performs transfer call on the platform by the name of specified sender. * * Can only be called by asset implementation contract assigned to sender. * * @param _to holder address to give to. * @param _value amount to transfer. * @param _reference transfer comment to be included in a platform's Transfer event. * @param _sender initial caller. * * @return success. */ function __transferWithReference(address _to, uint _value, string _reference, address _sender) onlyAccess(_sender) returns(bool) { return chronoBankPlatform.proxyTransferWithReference(_to, _value, smbl, _reference, _sender); } /** * Prforms allowance transfer of asset balance between holders. * * @param _from holder address to take from. * @param _to holder address to give to. * @param _value amount to transfer. * * @return success. */ function transferFrom(address _from, address _to, uint _value) returns(bool) { return _transferFromWithReference(_from, _to, _value, ""); } /** * Prforms allowance transfer of asset balance between holders adding specified comment. * * @param _from holder address to take from. * @param _to holder address to give to. * @param _value amount to transfer. * @param _reference transfer comment to be included in a platform's Transfer event. * * @return success. */ function transferFromWithReference(address _from, address _to, uint _value, string _reference) returns(bool) { return _transferFromWithReference(_from, _to, _value, _reference); } /** * Resolves asset implementation contract for the caller and forwards there arguments along with * the caller address. * * @return success. */ function _transferFromWithReference(address _from, address _to, uint _value, string _reference) internal returns(bool) { return _getAsset().__transferFromWithReference(_from, _to, _value, _reference, msg.sender); } /** * Performs allowance transfer call on the platform by the name of specified sender. * * Can only be called by asset implementation contract assigned to sender. * * @param _from holder address to take from. * @param _to holder address to give to. * @param _value amount to transfer. * @param _reference transfer comment to be included in a platform's Transfer event. * @param _sender initial caller. * * @return success. */ function __transferFromWithReference(address _from, address _to, uint _value, string _reference, address _sender) onlyAccess(_sender) returns(bool) { return chronoBankPlatform.proxyTransferFromWithReference(_from, _to, _value, smbl, _reference, _sender); } /** * Sets asset spending allowance for a specified spender. * * @param _spender holder address to set allowance to. * @param _value amount to allow. * * @return success. */ function approve(address _spender, uint _value) returns(bool) { return _approve(_spender, _value); } /** * Resolves asset implementation contract for the caller and forwards there arguments along with * the caller address. * * @return success. */ function _approve(address _spender, uint _value) internal returns(bool) { return _getAsset().__approve(_spender, _value, msg.sender); } /** * Performs allowance setting call on the platform by the name of specified sender. * * Can only be called by asset implementation contract assigned to sender. * * @param _spender holder address to set allowance to. * @param _value amount to allow. * @param _sender initial caller. * * @return success. */ function __approve(address _spender, uint _value, address _sender) onlyAccess(_sender) returns(bool) { return chronoBankPlatform.proxyApprove(_spender, _value, smbl, _sender); } /** * Emits ERC20 Transfer event on this contract. * * Can only be, and, called by assigned platform when asset transfer happens. */ function emitTransfer(address _from, address _to, uint _value) onlyChronoBankPlatform() { Transfer(_from, _to, _value); } /** * Emits ERC20 Approval event on this contract. * * Can only be, and, called by assigned platform when asset allowance set happens. */ function emitApprove(address _from, address _spender, uint _value) onlyChronoBankPlatform() { Approval(_from, _spender, _value); } /** * Resolves asset implementation contract for the caller and forwards there transaction data, * along with the value. This allows for proxy interface growth. */ function () payable { _getAsset().__process.value(msg.value)(msg.data, msg.sender); } /** * Indicates an upgrade freeze-time start, and the next asset implementation contract. */ event UpgradeProposal(address newVersion); // Current asset implementation contract address. address latestVersion; // Proposed next asset implementation contract address. address pendingVersion; // Upgrade freeze-time start. uint pendingVersionTimestamp; // Timespan for users to review the new implementation and make decision. uint constant UPGRADE_FREEZE_TIME = 3 days; // Asset implementation contract address that user decided to stick with. // 0x0 means that user uses latest version. mapping(address => address) userOptOutVersion; /** * Only asset implementation contract assigned to sender is allowed to call. */ modifier onlyAccess(address _sender) { if (getVersionFor(_sender) == msg.sender) { _; } } /** * Returns asset implementation contract address assigned to sender. * * @param _sender sender address. * * @return asset implementation contract address. */ function getVersionFor(address _sender) constant returns(address) { return userOptOutVersion[_sender] == 0 ? latestVersion : userOptOutVersion[_sender]; } /** * Returns current asset implementation contract address. * * @return asset implementation contract address. */ function getLatestVersion() constant returns(address) { return latestVersion; } /** * Returns proposed next asset implementation contract address. * * @return asset implementation contract address. */ function getPendingVersion() constant returns(address) { return pendingVersion; } /** * Returns upgrade freeze-time start. * * @return freeze-time start. */ function getPendingVersionTimestamp() constant returns(uint) { return pendingVersionTimestamp; } /** * Propose next asset implementation contract address. * * Can only be called by current asset owner. * * Note: freeze-time should not be applied for the initial setup. * * @param _newVersion asset implementation contract address. * * @return success. */ function proposeUpgrade(address _newVersion) onlyAssetOwner() returns(bool) { // Should not already be in the upgrading process. if (pendingVersion != 0x0) { return false; } // New version address should be other than 0x0. if (_newVersion == 0x0) { return false; } // Don't apply freeze-time for the initial setup. if (latestVersion == 0x0) { latestVersion = _newVersion; return true; } pendingVersion = _newVersion; pendingVersionTimestamp = now; UpgradeProposal(_newVersion); return true; } /** * Cancel the pending upgrade process. * * Can only be called by current asset owner. * * @return success. */ function purgeUpgrade() onlyAssetOwner() returns(bool) { if (pendingVersion == 0x0) { return false; } delete pendingVersion; delete pendingVersionTimestamp; return true; } /** * Finalize an upgrade process setting new asset implementation contract address. * * Can only be called after an upgrade freeze-time. * * @return success. */ function commitUpgrade() returns(bool) { if (pendingVersion == 0x0) { return false; } if (pendingVersionTimestamp + UPGRADE_FREEZE_TIME > now) { return false; } latestVersion = pendingVersion; delete pendingVersion; delete pendingVersionTimestamp; return true; } /** * Disagree with proposed upgrade, and stick with current asset implementation * until further explicit agreement to upgrade. * * @return success. */ function optOut() returns(bool) { if (userOptOutVersion[msg.sender] != 0x0) { return false; } userOptOutVersion[msg.sender] = latestVersion; return true; } /** * Implicitly agree to upgrade to current and future asset implementation upgrades, * until further explicit disagreement. * * @return success. */ function optIn() returns(bool) { delete userOptOutVersion[msg.sender]; return true; } }
Contract Security Audit
- No Contract Security Audit Submitted- Submit Audit Here
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indexed":false,"name":"newVersion","type":"address"}],"name":"UpgradeProposal","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"from","type":"address"},{"indexed":true,"name":"to","type":"address"},{"indexed":false,"name":"value","type":"uint256"}],"name":"Transfer","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"from","type":"address"},{"indexed":true,"name":"spender","type":"address"},{"indexed":false,"name":"value","type":"uint256"}],"name":"Approval","type":"event"}]
Contract Creation Code
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Swarm Source
bzzr://14a2415442d222c840a9f97e881c3a1a8b3b9e45ca90ea33df3ca27a39dd6a50
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