Contract Address Details

0xB9D26bCD5a865eB0C9420C45BF0B59a77787Ff98

Token
ICON (ICX)
Creator
0x09573b–9324c1 at 0xd7403a–1003ee
Implementation
0x1a6b526a73e2d68a120a87364f78bc88101a2d4d
Balance
0.00 NRG
Tokens
Fetching tokens...
Transactions
7,643 Transactions
Transfers
0 Transfers
Gas Used
204,004,352
Last Balance Update
2255542
Contract name:
GovernedERC20Proxy




Optimization enabled
true
Compiler version
v0.5.16+commit.9c3226ce




Optimization runs
200
EVM Version
petersburg




Verified at
2021-09-22 11:43:25.090605Z

Constructor Arguments

00000000000000000000000009573b876224dcfd82312e5679a28393da9324c10000000000000000000000000000000000000000000000000000000000000305

Arg [0] (address) : 0x09573b876224dcfd82312e5679a28393da9324c1
Arg [1] (address) : 0x0000000000000000000000000000000000000305

              

Contract source code

pragma solidity 0.5.16;
// File: assets/contracts/interfaces/IGovernedContract.sol
// Copyright 2019 The Energi Core Authors
// This file is part of Energi Core.
//
// Energi Core is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Energi Core is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Energi Core. If not, see <http://www.gnu.org/licenses/>.
// Energi Governance system is the fundamental part of Energi Core.
// NOTE: It's not allowed to change the compiler due to byte-to-byte
// match requirement.
/**
* Genesis version of GovernedContract interface.
*
* Base Consensus interface for upgradable contracts.
* Unlike common approach, the implementation is NOT expected to be
* called through delegatecall() to minimize risks of shared storage.
*
* NOTE: it MUST NOT change after blockchain launch!
*/
interface IGovernedContract {
// Return actual proxy address for secure validation
function proxy() external returns(address);
// It must check that the caller is the proxy
// and copy all required data from the old address.
function migrate(IGovernedContract _oldImpl) external;
// It must check that the caller is the proxy
// and self destruct to the new address.
function destroy(IGovernedContract _newImpl) external;
// function () external payable; // This line (from original Energi IGovernedContract) is commented because it
// makes truffle migrations fail
}
// File: assets/contracts/interfaces/IProposal.sol
// Copyright 2019 The Energi Core Authors
// This file is part of Energi Core.
//
// Energi Core is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Energi Core is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Energi Core. If not, see <http://www.gnu.org/licenses/>.
// Energi Governance system is the fundamental part of Energi Core.
// NOTE: It's not allowed to change the compiler due to byte-to-byte
// match requirement.
interface IProposal {
function parent() external view returns(address);
function created_block() external view returns(uint);
function deadline() external view returns(uint);
function fee_payer() external view returns(address payable);
function fee_amount() external view returns(uint);
function accepted_weight() external view returns(uint);
function rejected_weight() external view returns(uint);
function total_weight() external view returns(uint);
function quorum_weight() external view returns(uint);
function isFinished() external view returns(bool);
function isAccepted() external view returns(bool);
function withdraw() external;
function destroy() external;
function collect() external;
function voteAccept() external;
function voteReject() external;
function setFee() external payable;
function canVote(address owner) external view returns(bool);
}
// File: assets/contracts/interfaces/IUpgradeProposal.sol
// Copyright 2019 The Energi Core Authors
// This file is part of Energi Core.
//
// Energi Core is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Energi Core is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Energi Core. If not, see <http://www.gnu.org/licenses/>.
// Energi Governance system is the fundamental part of Energi Core.
// NOTE: It's not allowed to change the compiler due to byte-to-byte
// match requirement.
/**
* Interface of UpgradeProposal
*/
contract IUpgradeProposal is IProposal {
function impl() external view returns(IGovernedContract);
}
// File: assets/contracts/interfaces/IGovernedProxy.sol
// Copyright 2019 The Energi Core Authors
// This file is part of Energi Core.
//
// Energi Core is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Energi Core is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Energi Core. If not, see <http://www.gnu.org/licenses/>.
// Energi Governance system is the fundamental part of Energi Core.
// NOTE: It's not allowed to change the compiler due to byte-to-byte
// match requirement.
//pragma experimental SMTChecker;
/**
* Genesis version of IGovernedProxy interface.
*
* Base Consensus interface for upgradable contracts proxy.
* Unlike common approach, the implementation is NOT expected to be
* called through delegatecall() to minimize risks of shared storage.
*
* NOTE: it MUST NOT change after blockchain launch!
*/
interface IGovernedProxy {
event UpgradeProposal(
IGovernedContract indexed impl,
IUpgradeProposal proposal
);
event Upgraded(
IGovernedContract indexed impl,
IUpgradeProposal proposal
);
function impl() external view returns(IGovernedContract);
function proposeUpgrade(IGovernedContract _newImpl, uint _period)
external payable returns(IUpgradeProposal);
function upgrade(IUpgradeProposal _proposal) external;
function upgradeProposalImpl(IUpgradeProposal _proposal) external view returns(IGovernedContract new_impl);
function listUpgradeProposals() external view returns(IUpgradeProposal[] memory proposals);
function collectUpgradeProposal(IUpgradeProposal _proposal) external;
function () external payable;
}
// File: assets/contracts/interfaces/IGovernedERC20Proxy.sol
// Copyright 2019 The Energi Core Authors
// This file is part of Energi Core.
//
// Energi Core is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Energi Core is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Energi Core. If not, see <http://www.gnu.org/licenses/>.
// Energi Governance system is the fundamental part of Energi Core.
// NOTE: It's not allowed to change the compiler due to byte-to-byte
// match requirement.
/**
* Genesis version of IGovernedProxy interface.
*
* Base Consensus interface for upgradable contracts proxy.
* Unlike common approach, the implementation is NOT expected to be
* called through delegatecall() to minimize risks of shared storage.
*
* NOTE: it MUST NOT change after blockchain launch!
*/
interface IGovernedERC20Proxy {
event UpgradeProposal(
IGovernedContract indexed impl,
IUpgradeProposal proposal
);
event Upgraded(
IGovernedContract indexed impl,
IUpgradeProposal proposal
);
// ERC20 standard interface
function name() external view returns(string memory _name);
function symbol() external view returns(string memory _symbol);
function decimals() external view returns(uint _decimals);
function balanceOf(address account) external view returns(uint _balance);
function allowance(address owner, address spender) external view returns(uint _allowance);
function totalSupply() external view returns(uint _totalSupply);
function approve(address spender, uint value) external returns (bool result);
function transfer(address to, uint value) external returns (bool result);
function transferFrom(address from, address to, uint value) external returns (bool result);
function increaseAllowance(address spender, uint256 addedValue) external returns (bool result);
function decreaseAllowance(address spender, uint256 subtractedValue) external returns (bool result);
// Energi governance interface
function impl() external view returns(IGovernedContract);
function proposeUpgrade(IGovernedContract _newImpl, uint _period) external payable returns(IUpgradeProposal);
function upgrade(IUpgradeProposal _proposal) external;
function upgradeProposalImpl(IUpgradeProposal _proposal) external view returns(IGovernedContract new_impl);
function listUpgradeProposals() external view returns(IUpgradeProposal[] memory proposals);
function collectUpgradeProposal(IUpgradeProposal _proposal) external;
function () external payable;
/**
* @dev Emitted when `value` tokens are moved from one account (`from`) to
* another (`to`).
*
* Note that `value` may be zero.
*/
event Transfer(address indexed from, address indexed to, uint256 value);
/**
* @dev Emitted when the allowance of a `spender` for an `owner` is set by
* a call to {approve}. `value` is the new allowance.
*/
event Approval(address indexed _owner, address indexed spender, uint256 value);
}
// File: assets/contracts/interfaces/ISporkRegistry.sol
// Copyright 2019 The Energi Core Authors
// This file is part of Energi Core.
//
// Energi Core is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Energi Core is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Energi Core. If not, see <http://www.gnu.org/licenses/>.
// Energi Governance system is the fundamental part of Energi Core.
// NOTE: It's not allowed to change the compiler due to byte-to-byte
// match requirement.
interface ISporkRegistry {
function createUpgradeProposal(
IGovernedContract _impl,
uint _period,
address payable _fee_payer
)
external payable
returns (IUpgradeProposal);
function consensusGasLimits()
external view
returns(uint callGas, uint xferGas);
}
// File: assets/contracts/NonReentrant.sol
// Copyright 2019 The Energi Core Authors
// This file is part of Energi Core.
//
// Energi Core is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Energi Core is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Energi Core. If not, see <http://www.gnu.org/licenses/>.
// Energi Governance system is the fundamental part of Energi Core.
// NOTE: It's not allowed to change the compiler due to byte-to-byte
// match requirement.
/**
* A little helper to protect contract from being re-entrant in state
* modifying functions.
*/
contract NonReentrant {
uint private entry_guard;
modifier noReentry {
require(entry_guard == 0, "Reentry");
entry_guard = 1;
_;
entry_guard = 0;
}
}
// File: assets/contracts/interfaces/IGovernedERC20.sol
// Copyright (C) 2021 Energi Core
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
/**
* @dev Interface of the ERC20 standard as defined in the EIP. Does not include
* the optional functions; to access them see {ERC20Detailed}.
*/
interface IGovernedERC20 {
function governedERC20Proxy() external view returns(address _governedERC20Proxy);
function erc20Storage() external view returns(address _erc20Storage);
function name() external view returns(string memory _name);
function symbol() external view returns(string memory _symbol);
function decimals() external view returns(uint8 _decimals);
function totalSupply() external view returns (uint256);
function balanceOf(address account) external view returns (uint256);
function allowance(address owner, address spender) external view returns (uint256);
function transfer(address sender, address recipient, uint256 amount) external returns (bool);
function approve(address owner, address spender, uint256 amount) external returns (bool);
function transferFrom(address spender, address sender, address recipient, uint256 amount) external returns (bool);
function increaseAllowance(address sender, address spender, uint256 addedValue) external returns (bool);
function decreaseAllowance(address sender, address spender, uint256 subtractedValue) external returns (bool);
}
// File: assets/contracts/interfaces/IOwnedERC20.sol
interface IOwnedERC20 {
function owner() external view returns(address _owner);
function mint(address recipient, uint amount) external;
function burn(address recipient, uint amount) external;
function setOwner(address _owner) external;
}
// File: assets/contracts/libraries/SafeMath.sol
// Copyright (C) 2021 Energi Core
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
/**
* @dev Wrappers over Solidity's arithmetic operations with added overflow
* checks.
*
* Arithmetic operations in Solidity wrap on overflow. This can easily result
* in bugs, because programmers usually assume that an overflow raises an
* error, which is the standard behavior in high level programming languages.
* `SafeMath` restores this intuition by reverting the transaction when an
* operation overflows.
*
* Using this library instead of the unchecked operations eliminates an entire
* class of bugs, so it's recommended to use it always.
*/
library SafeMath {
/**
* @dev Returns the addition of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `+` operator.
*
* Requirements:
* - Addition cannot overflow.
*/
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
require(c >= a, "SafeMath: addition overflow");
return c;
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting on
* overflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
* - Subtraction cannot overflow.
*/
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
return sub(a, b, "SafeMath: subtraction overflow");
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting with custom message on
* overflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
* - Subtraction cannot overflow.
*
* _Available since v2.4.0._
*/
function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b <= a, errorMessage);
uint256 c = a - b;
return c;
}
/**
* @dev Returns the multiplication of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `*` operator.
*
* Requirements:
* - Multiplication cannot overflow.
*/
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
// Gas optimization: this is cheaper than requiring 'a' not being zero, but the
// benefit is lost if 'b' is also tested.
// See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
if (a == 0) {
return 0;
}
uint256 c = a * b;
require(c / a == b, "SafeMath: multiplication overflow");
return c;
}
/**
* @dev Returns the integer division of two unsigned integers. Reverts on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator. Note: this function uses a
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* uses an invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
* - The divisor cannot be zero.
*/
function div(uint256 a, uint256 b) internal pure returns (uint256) {
return div(a, b, "SafeMath: division by zero");
}
/**
* @dev Returns the integer division of two unsigned integers. Reverts with custom message on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator. Note: this function uses a
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* uses an invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
* - The divisor cannot be zero.
*
* _Available since v2.4.0._
*/
function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
// Solidity only automatically asserts when dividing by 0
require(b > 0, errorMessage);
uint256 c = a / b;
// assert(a == b * c + a % b); // There is no case in which this doesn't hold
return c;
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* Reverts when dividing by zero.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
* - The divisor cannot be zero.
*/
function mod(uint256 a, uint256 b) internal pure returns (uint256) {
return mod(a, b, "SafeMath: modulo by zero");
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* Reverts with custom message when dividing by zero.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
* - The divisor cannot be zero.
*
* _Available since v2.4.0._
*/
function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b != 0, errorMessage);
return a % b;
}
}
// File: assets/contracts/GovernedERC20Proxy.sol
// Copyright 2019 The Energi Core Authors
// This file is part of Energi Core.
//
// Energi Core is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Energi Core is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Energi Core. If not, see <http://www.gnu.org/licenses/>.
// Energi Governance system is the fundamental part of Energi Core.
// NOTE: It's not allowed to change the compiler due to byte-to-byte
// match requirement.
/**
* SC-9: This contract has no chance of being updated. It must be stupid simple.
*
* If another upgrade logic is required in the future - it can be done as proxy stage II.
*/
contract GovernedERC20Proxy is IGovernedERC20Proxy, NonReentrant {
using SafeMath for uint;
IGovernedContract public impl;
IGovernedProxy public spork_proxy;
mapping(address => IGovernedContract) public upgrade_proposals;
IUpgradeProposal[] public upgrade_proposal_list;
modifier senderOrigin {
// Internal calls are expected to use impl directly.
// That's due to use of call() instead of delegatecall() on purpose.
// solium-disable-next-line security/no-tx-origin
require(tx.origin == msg.sender, "Only direct calls are allowed!");
_;
}
modifier onlyImpl {
require(msg.sender == address(impl), "Only calls from impl are allowed!");
_;
}
constructor(IGovernedContract _impl, IGovernedProxy _sporkProxy) public {
impl = _impl;
spork_proxy = _sporkProxy;
}
// ERC20 standard functions
function name() external view returns(string memory _name) {
_name = IGovernedERC20(address(uint160(address(impl)))).name();
}
function symbol() external view returns(string memory _symbol) {
_symbol = IGovernedERC20(address(uint160(address(impl)))).symbol();
}
function decimals() external view returns(uint _decimals) {
_decimals = IGovernedERC20(address(uint160(address(impl)))).decimals();
}
function balanceOf(address account) external view returns(uint _balance) {
_balance = IGovernedERC20(address(uint160(address(impl)))).balanceOf(account);
}
function allowance(address owner, address spender) external view returns(uint _allowance) {
_allowance = IGovernedERC20(address(uint160(address(impl)))).allowance(owner, spender);
}
function totalSupply() external view returns(uint _totalSupply) {
_totalSupply = IGovernedERC20(address(uint160(address(impl)))).totalSupply();
}
function approve(address spender, uint value) external returns (bool result) {
result = IGovernedERC20(address(uint160(address(impl)))).approve(msg.sender, spender, value);
emit Approval(msg.sender, spender, value);
}
function transfer(address to, uint value) external returns (bool result) {
result = IGovernedERC20(address(uint160(address(impl)))).transfer(msg.sender, to, value);
emit Transfer(msg.sender, to, value);
}
function transferFrom(address from, address to, uint value) external returns (bool result) {
result = IGovernedERC20(address(uint160(address(impl)))).transferFrom(msg.sender, from, to, value);
emit Transfer(from, to, value);
uint newApproveAmount = IGovernedERC20(address(uint160(address(impl)))).allowance(from, msg.sender);
emit Approval(from, msg.sender, newApproveAmount);
}
function increaseAllowance(address spender, uint256 addedValue) external returns (bool result) {
result = IGovernedERC20(address(uint160(address(impl)))).increaseAllowance(msg.sender, spender, addedValue);
uint newApproveAmount = IGovernedERC20(address(uint160(address(impl)))).allowance(msg.sender, spender);
emit Approval(msg.sender, spender, newApproveAmount);
}
function decreaseAllowance(address spender, uint256 subtractedValue) external returns (bool result) {
result = IGovernedERC20(address(uint160(address(impl)))).decreaseAllowance(msg.sender, spender, subtractedValue);
uint newApproveAmount = IGovernedERC20(address(uint160(address(impl)))).allowance(msg.sender, spender);
emit Approval(msg.sender, spender, newApproveAmount);
}
// OwnedERC20 funtions
function mint(address recipient, uint amount) external {
IOwnedERC20(address(uint160(address(impl)))).mint(recipient, amount);
emit Transfer(address(0), recipient, amount);
}
function burn(address recipient, uint amount) external {
IOwnedERC20(address(uint160(address(impl)))).burn(recipient, amount);
emit Transfer(recipient, address(0), amount);
}
// Governance functions
/**
* Pre-create a new contract first.
* Then propose upgrade based on that.
*/
function proposeUpgrade(IGovernedContract _newImpl, uint _period)
external payable
senderOrigin
noReentry
returns(IUpgradeProposal)
{
require(_newImpl != impl, "Already active!");
require(_newImpl.proxy() == address(this), "Wrong proxy!");
ISporkRegistry spork_reg = ISporkRegistry(address(spork_proxy.impl()));
IUpgradeProposal proposal = spork_reg.createUpgradeProposal.value(msg.value)(_newImpl, _period, msg.sender);
upgrade_proposals[address(proposal)] = _newImpl;
upgrade_proposal_list.push(proposal);
emit UpgradeProposal(_newImpl, proposal);
return proposal;
}
/**
* Once proposal is accepted, anyone can activate that.
*/
function upgrade(IUpgradeProposal _proposal)
external
noReentry
{
IGovernedContract new_impl = upgrade_proposals[address(_proposal)];
require(new_impl != impl, "Already active!"); // in case it changes in the flight
require(address(new_impl) != address(0), "Not registered!");
require(_proposal.isAccepted(), "Not accepted!");
IGovernedContract old_impl = impl;
new_impl.migrate(old_impl);
impl = new_impl;
old_impl.destroy(new_impl);
// SECURITY: prevent downgrade attack
_cleanupProposal(_proposal);
// Return fee ASAP
_proposal.destroy();
emit Upgraded(new_impl, _proposal);
}
/**
* Map proposal to implementation
*/
function upgradeProposalImpl(IUpgradeProposal _proposal)
external view
returns(IGovernedContract new_impl)
{
new_impl = upgrade_proposals[address(_proposal)];
}
/**
* Lists all available upgrades
*/
function listUpgradeProposals()
external view
returns(IUpgradeProposal[] memory proposals)
{
uint len = upgrade_proposal_list.length;
proposals = new IUpgradeProposal[](len);
for (uint i = 0; i < len; ++i) {
proposals[i] = upgrade_proposal_list[i];
}
return proposals;
}
/**
* Once proposal is reject, anyone can start collect procedure.
*/
function collectUpgradeProposal(IUpgradeProposal _proposal)
external
noReentry
{
IGovernedContract new_impl = upgrade_proposals[address(_proposal)];
require(address(new_impl) != address(0), "Not registered!");
_proposal.collect();
delete upgrade_proposals[address(_proposal)];
_cleanupProposal(_proposal);
}
function _cleanupProposal(IUpgradeProposal _proposal) internal {
delete upgrade_proposals[address(_proposal)];
uint len = upgrade_proposal_list.length;
for (uint i = 0; i < len; ++i) {
if (upgrade_proposal_list[i] == _proposal) {
upgrade_proposal_list[i] = upgrade_proposal_list[len - 1];
upgrade_proposal_list.pop();
break;
}
}
}
/**
* Related to above
*/
function proxy() external view returns (address) {
return address(this);
}
/**
* SECURITY: prevent on-behalf-of calls
*/
function migrate(IGovernedContract) external pure {
revert("Good try");
}
/**
* SECURITY: prevent on-behalf-of calls
*/
function destroy(IGovernedContract) external pure {
revert("Good try");
}
/**
* Proxy all other calls to implementation.
*/
function ()
external payable
senderOrigin
{
// SECURITY: senderOrigin() modifier is mandatory
IGovernedContract impl_m = impl;
// solium-disable-next-line security/no-inline-assembly
assembly {
let ptr := mload(0x40)
calldatacopy(ptr, 0, calldatasize)
let res := call(sub(gas, 10000), impl_m, callvalue, ptr, calldatasize, 0, 0)
// NOTE: returndatasize should allow repeatable calls
// what should save one opcode.
returndatacopy(ptr, 0, returndatasize)
switch res
case 0 {
revert(ptr, returndatasize)
}
default {
return(ptr, returndatasize)
}
}
}
}

Contract ABI

[{"type":"constructor","stateMutability":"nonpayable","payable":false,"inputs":[{"type":"address","name":"_impl","internalType":"contract IGovernedContract"},{"type":"address","name":"_sporkProxy","internalType":"contract IGovernedProxy"}]},{"type":"event","name":"Approval","inputs":[{"type":"address","name":"_owner","internalType":"address","indexed":true},{"type":"address","name":"spender","internalType":"address","indexed":true},{"type":"uint256","name":"value","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"Transfer","inputs":[{"type":"address","name":"from","internalType":"address","indexed":true},{"type":"address","name":"to","internalType":"address","indexed":true},{"type":"uint256","name":"value","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"UpgradeProposal","inputs":[{"type":"address","name":"impl","internalType":"contract IGovernedContract","indexed":true},{"type":"address","name":"proposal","internalType":"contract IUpgradeProposal","indexed":false}],"anonymous":false},{"type":"event","name":"Upgraded","inputs":[{"type":"address","name":"impl","internalType":"contract IGovernedContract","indexed":true},{"type":"address","name":"proposal","internalType":"contract IUpgradeProposal","indexed":false}],"anonymous":false},{"type":"fallback","stateMutability":"payable","payable":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":"_allowance","internalType":"uint256"}],"name":"allowance","inputs":[{"type":"address","name":"owner","internalType":"address"},{"type":"address","name":"spender","internalType":"address"}],"constant":true},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[{"type":"bool","name":"result","internalType":"bool"}],"name":"approve","inputs":[{"type":"address","name":"spender","internalType":"address"},{"type":"uint256","name":"value","internalType":"uint256"}],"constant":false},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":"_balance","internalType":"uint256"}],"name":"balanceOf","inputs":[{"type":"address","name":"account","internalType":"address"}],"constant":true},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"burn","inputs":[{"type":"address","name":"recipient","internalType":"address"},{"type":"uint256","name":"amount","internalType":"uint256"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"collectUpgradeProposal","inputs":[{"type":"address","name":"_proposal","internalType":"contract IUpgradeProposal"}],"constant":false},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":"_decimals","internalType":"uint256"}],"name":"decimals","inputs":[],"constant":true},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[{"type":"bool","name":"result","internalType":"bool"}],"name":"decreaseAllowance","inputs":[{"type":"address","name":"spender","internalType":"address"},{"type":"uint256","name":"subtractedValue","internalType":"uint256"}],"constant":false},{"type":"function","stateMutability":"pure","payable":false,"outputs":[],"name":"destroy","inputs":[{"type":"address","name":"","internalType":"contract IGovernedContract"}],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"address","name":"","internalType":"contract IGovernedContract"}],"name":"impl","inputs":[],"constant":true},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[{"type":"bool","name":"result","internalType":"bool"}],"name":"increaseAllowance","inputs":[{"type":"address","name":"spender","internalType":"address"},{"type":"uint256","name":"addedValue","internalType":"uint256"}],"constant":false},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"address[]","name":"proposals","internalType":"contract IUpgradeProposal[]"}],"name":"listUpgradeProposals","inputs":[],"constant":true},{"type":"function","stateMutability":"pure","payable":false,"outputs":[],"name":"migrate","inputs":[{"type":"address","name":"","internalType":"contract IGovernedContract"}],"constant":true},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"mint","inputs":[{"type":"address","name":"recipient","internalType":"address"},{"type":"uint256","name":"amount","internalType":"uint256"}],"constant":false},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"string","name":"_name","internalType":"string"}],"name":"name","inputs":[],"constant":true},{"type":"function","stateMutability":"payable","payable":true,"outputs":[{"type":"address","name":"","internalType":"contract IUpgradeProposal"}],"name":"proposeUpgrade","inputs":[{"type":"address","name":"_newImpl","internalType":"contract IGovernedContract"},{"type":"uint256","name":"_period","internalType":"uint256"}],"constant":false},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"address","name":"","internalType":"address"}],"name":"proxy","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"address","name":"","internalType":"contract IGovernedProxy"}],"name":"spork_proxy","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"string","name":"_symbol","internalType":"string"}],"name":"symbol","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":"_totalSupply","internalType":"uint256"}],"name":"totalSupply","inputs":[],"constant":true},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[{"type":"bool","name":"result","internalType":"bool"}],"name":"transfer","inputs":[{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"value","internalType":"uint256"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[{"type":"bool","name":"result","internalType":"bool"}],"name":"transferFrom","inputs":[{"type":"address","name":"from","internalType":"address"},{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"value","internalType":"uint256"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"upgrade","inputs":[{"type":"address","name":"_proposal","internalType":"contract IUpgradeProposal"}],"constant":false},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"address","name":"new_impl","internalType":"contract IGovernedContract"}],"name":"upgradeProposalImpl","inputs":[{"type":"address","name":"_proposal","internalType":"contract IUpgradeProposal"}],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"address","name":"","internalType":"contract IUpgradeProposal"}],"name":"upgrade_proposal_list","inputs":[{"type":"uint256","name":"","internalType":"uint256"}],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"address","name":"","internalType":"contract IGovernedContract"}],"name":"upgrade_proposals","inputs":[{"type":"address","name":"","internalType":"address"}],"constant":true}]
            

Deployed ByteCode

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