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NameSpaceRegistrar.sol
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NameSpaceRegistrar.sol
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pragma solidity ^0.4.18;
/*
Allows issuers to reserve their token symbols under a given namespace ahead
of actually generating their security token.
SecurityTokenRegistrar would reference this contract and ensure that any token symbols
registered here can only be created by their owner.
*/
/**
* @title NameSpaceRegistrar
* @dev Contract use to register the security token symbols
*/
contract NameSpaceRegistrar {
string public VERSION = "2";
mapping (string => mapping (string => address)) symbolOwner; //Maps namespaces to token symbols to owner address
mapping (string => mapping (string => uint256)) symbolTimestamp; //Maps namespaces to token symbols to registration timestamp
mapping (string => mapping (string => string)) symbolDescription; //Maps token symbols to their description - this is only used internally within this contract
mapping (string => mapping (string => string)) symbolContact; //Maps token symbols to their contact details - this is only used internally within this contract
mapping (address => bool) hasRegistered; //Tracks addresses that have registered tokens, only allow one registration per address
mapping (address => bool) public admins; //Track valid admin addresses
event AdminChange(address indexed _admin, bool _valid);
event RegisteredToken(string _nameSpace, string _symbol, string _description, string _contact, address indexed _owner, address indexed _admin, uint256 _timestamp);
event TokenOwnerChange(string _nameSpace, string _symbol, address indexed _oldOwner, address indexed _newOwner);
// Check that msg.sender is an admin
modifier onlyAdmin {
require(admins[msg.sender]);
_;
}
/**
* @dev Constructor - sets the admin
* the creation of the security token
*/
function NameSpaceRegistrar() public
{
admins[msg.sender] = true;
}
/**
* @dev allows the admin address to set a new admin
* @param _admin admin address
* @param _valid bool to indicate whether admin address is allowed
*/
function changeAdmin(address _admin, bool _valid) onlyAdmin public {
admins[_admin] = _valid;
AdminChange(_admin, _valid);
}
/**
* @dev allows the owner of a token registration to change the owner
* @param _nameSpace namespace
* @param _symbol token symbol
* @param _newOwner new owner
*/
function changeTokenOwner(string _nameSpace, string _symbol, address _newOwner) public {
require(symbolOwner[_nameSpace][_symbol] == msg.sender);
symbolOwner[_nameSpace][_symbol] = _newOwner;
TokenOwnerChange(_nameSpace, _symbol, msg.sender, _newOwner);
}
/**
* @dev Registers a new token symbol and owner against a specific namespace
* @param _nameSpace namespace
* @param _symbol token symbol
* @param _description token description
* @param _contact token contract details e.g. email
* @param _owner owner
*/
function registerToken(string _nameSpace, string _symbol, string _description, string _contact, address _owner) onlyAdmin public {
require(!hasRegistered[_owner]);
require(symbolOwner[_nameSpace][_symbol] == address(0));
hasRegistered[_owner] = true;
symbolOwner[_nameSpace][_symbol] = _owner;
symbolDescription[_nameSpace][_symbol] = _description;
symbolContact[_nameSpace][_symbol] = _contact;
symbolTimestamp[_nameSpace][_symbol] = now;
RegisteredToken(_nameSpace, _symbol, _description, _contact, _owner, msg.sender, now);
}
/**
* @dev Returns the owner and timestamp for a given symbol, under a given namespace - can be called by other contracts
* @param _nameSpace namespace
* @param _symbol symbol
*/
function getDetails(string _nameSpace, string _symbol) view public returns (address, uint256) {
return (symbolOwner[_nameSpace][_symbol], symbolTimestamp[_nameSpace][_symbol]);
}
/**
* @dev Returns the description and contact details for a given symbol, under a given namespace - cannot be called by other contracts
* @param _nameSpace namespace
* @param _symbol symbol
*/
function getDescription(string _nameSpace, string _symbol) view public returns (string, string) {
return (symbolDescription[_nameSpace][_symbol], symbolDescription[_nameSpace][_symbol]);
}
}