/**
*Submitted for verification at Etherscan.io on 2021-01-17
*/
/**
* @title CoinTool, support ETH and ERC20 Tokens
* @dev To Use this Dapp: https://cointool.app
*/
pragma solidity 0.4.24;
/**
* @title Proxy
* @dev Gives the possibility to delegate any call to a foreign implementation.
*/
contract Proxy {
/**
* @dev Tells the address of the implementation where every call will be delegated.
* @return address of the implementation to which it will be delegated
*/
function implementation() public view returns (address);
/**
* @dev Tells the version of the current implementation
* @return version of the current implementation
*/
function version() public view returns (string);
/**
* @dev Fallback function allowing to perform a delegatecall to the given implementation.
* This function will return whatever the implementation call returns
*/
function () payable public {
address _impl = implementation();
require(_impl != address(0));
assembly {
let ptr := mload(0x40)
calldatacopy(ptr, 0, calldatasize)
let result := delegatecall(gas, _impl, ptr, calldatasize, 0, 0)
let size := returndatasize
returndatacopy(ptr, 0, size)
switch result
case 0 { revert(ptr, size) }
default { return(ptr, size) }
}
}
}
pragma solidity 0.4.24;
/**
* @title UpgradeabilityProxy
* @dev This contract represents a proxy where the implementation address to which it will delegate can be upgraded
*/
contract UpgradeabilityProxy is Proxy {
/**
* @dev This event will be emitted every time the implementation gets upgraded
* @param implementation representing the address of the upgraded implementation
*/
event Upgraded(address indexed implementation, string version);
// Storage position of the address of the current implementation
bytes32 private constant implementationPosition = keccak256("cointool.app.proxy.implementation");
//Version name of the current implementation
string internal _version;
/**
* @dev Constructor function
*/
constructor() public {}
/**
* @dev Tells the version name of the current implementation
* @return string representing the name of the current version
*/
function version() public view returns (string) {
return _version;
}
/**
* @dev Tells the address of the current implementation
* @return address of the current implementation
*/
function implementation() public view returns (address impl) {
bytes32 position = implementationPosition;
assembly {
impl := sload(position)
}
}
/**
* @dev Sets the address of the current implementation
* @param _newImplementation address representing the new implementation to be set
*/
function _setImplementation(address _newImplementation) internal {
bytes32 position = implementationPosition;
assembly {
sstore(position, _newImplementation)
}
}
/**
* @dev Upgrades the implementation address
* @param _newImplementation representing the address of the new implementation to be set
*/
function _upgradeTo(address _newImplementation, string _newVersion) internal {
address currentImplementation = implementation();
require(currentImplementation != _newImplementation);
_setImplementation(_newImplementation);
_version = _newVersion;
emit Upgraded( _newImplementation, _newVersion);
}
}
pragma solidity 0.4.24;
/**
* @title CoinToolProxy
* @dev This contract combines an upgradeability proxy with basic authorization control functionalities
*/
contract CoinToolProxy is UpgradeabilityProxy {
/**
* @dev Event to show ownership has been transferred
* @param previousOwner representing the address of the previous owner
* @param newOwner representing the address of the new owner
*/
event ProxyOwnershipTransferred(address previousOwner, address newOwner);
// Storage position of the owner of the contract
bytes32 private constant proxyOwnerPosition = keccak256("cointool.app.proxy.owner");
/**
* @dev the constructor sets the original owner of the contract to the sender account.
*/
constructor(address _implementation, string _version) public {
_setUpgradeabilityOwner(msg.sender);
_upgradeTo(_implementation, _version);
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyProxyOwner() {
require(msg.sender == proxyOwner());
_;
}
/**
* @dev Tells the address of the owner
* @return the address of the owner
*/
function proxyOwner() public view returns (address owner) {
bytes32 position = proxyOwnerPosition;
assembly {
owner := sload(position)
}
}
/**
* @dev Allows the current owner to transfer control of the contract to a newOwner.
* @param _newOwner The address to transfer ownership to.
*/
function transferProxyOwnership(address _newOwner) public onlyProxyOwner {
require(_newOwner != address(0));
_setUpgradeabilityOwner(_newOwner);
emit ProxyOwnershipTransferred(proxyOwner(), _newOwner);
}
/**
* @dev Allows the proxy owner to upgrade the current version of the proxy.
* @param _implementation representing the address of the new implementation to be set.
*/
function upgradeTo(address _implementation, string _newVersion) public onlyProxyOwner {
_upgradeTo(_implementation, _newVersion);
}
/**
* @dev Allows the proxy owner to upgrade the current version of the proxy and call the new implementation
* to initialize whatever is needed through a low level call.
* @param _implementation representing the address of the new implementation to be set.
* @param _data represents the msg.data to bet sent in the low level call. This parameter may include the function
* signature of the implementation to be called with the needed payload
*/
function upgradeToAndCall(address _implementation, string _newVersion, bytes _data) payable public onlyProxyOwner {
_upgradeTo(_implementation, _newVersion);
require(address(this).call.value(msg.value)(_data));
}
/*
* @dev Sets the address of the owner
*/
function _setUpgradeabilityOwner(address _newProxyOwner) internal {
bytes32 position = proxyOwnerPosition;
assembly {
sstore(position, _newProxyOwner)
}
}
}
This is a contract for multi-transmission. But I can't see the multisender code anywhere. How does this work?