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Warning! Contract bytecode has been changed and doesn't match the verified one. Therefore, interaction with this smart contract may be risky.
This contract has been partially verified via Sourcify.
View contract in Sourcify repository
- Contract name:
- WyvernProxyRegistry
- Optimization enabled
- true
- Compiler version
- v0.4.23+commit.124ca40d
- Optimization runs
- 200
- EVM Version
- byzantium
- Verified at
- 2026-03-08T00:00:09.009434Z
WyvernProxyRegistry.sol
pragma solidity ^0.4.13;
contract Ownable {
address public owner;
event OwnershipRenounced(address indexed previousOwner);
event OwnershipTransferred(
address indexed previousOwner,
address indexed newOwner
);
/**
* @dev The Ownable constructor sets the original `owner` of the contract to the sender
* account.
*/
constructor() public {
owner = msg.sender;
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
require(msg.sender == owner);
_;
}
/**
* @dev Allows the current owner to transfer control of the contract to a newOwner.
* @param newOwner The address to transfer ownership to.
*/
function transferOwnership(address newOwner) public onlyOwner {
require(newOwner != address(0));
emit OwnershipTransferred(owner, newOwner);
owner = newOwner;
}
/**
* @dev Allows the current owner to relinquish control of the contract.
*/
function renounceOwnership() public onlyOwner {
emit OwnershipRenounced(owner);
owner = address(0);
}
}
contract ERC20Basic {
function totalSupply() public view returns (uint256);
function balanceOf(address who) public view returns (uint256);
function transfer(address to, uint256 value) public returns (bool);
event Transfer(address indexed from, address indexed to, uint256 value);
}
contract ERC20 is ERC20Basic {
function allowance(address owner, address spender)
public view returns (uint256);
function transferFrom(address from, address to, uint256 value)
public returns (bool);
function approve(address spender, uint256 value) public returns (bool);
event Approval(
address indexed owner,
address indexed spender,
uint256 value
);
}
contract TokenRecipient {
event ReceivedEther(address indexed sender, uint amount);
event ReceivedTokens(address indexed from, uint256 value, address indexed token, bytes extraData);
/**
* @dev Receive tokens and generate a log event
* @param from Address from which to transfer tokens
* @param value Amount of tokens to transfer
* @param token Address of token
* @param extraData Additional data to log
*/
function receiveApproval(address from, uint256 value, address token, bytes extraData) public {
ERC20 t = ERC20(token);
require(t.transferFrom(from, this, value));
emit ReceivedTokens(from, value, token, extraData);
}
/**
* @dev Receive Ether and generate a log event
*/
function () payable public {
emit ReceivedEther(msg.sender, msg.value);
}
}
contract ProxyRegistry is Ownable {
/* DelegateProxy implementation contract. Must be initialized. */
address public delegateProxyImplementation;
/* Authenticated proxies by user. */
mapping(address => OwnableDelegateProxy) public proxies;
/* Contracts pending access. */
mapping(address => uint) public pending;
/* Contracts allowed to call those proxies. */
mapping(address => bool) public contracts;
/* Delay period for adding an authenticated contract.
This mitigates a particular class of potential attack on the Wyvern DAO (which owns this registry) - if at any point the value of assets held by proxy contracts exceeded the value of half the WYV supply (votes in the DAO),
a malicious but rational attacker could buy half the Wyvern and grant themselves access to all the proxy contracts. A delay period renders this attack nonthreatening - given two weeks, if that happened, users would have
plenty of time to notice and transfer their assets.
*/
uint public DELAY_PERIOD = 2 weeks;
/**
* Start the process to enable access for specified contract. Subject to delay period.
*
* @dev ProxyRegistry owner only
* @param addr Address to which to grant permissions
*/
function startGrantAuthentication (address addr)
public
onlyOwner
{
require(!contracts[addr] && pending[addr] == 0);
pending[addr] = now;
}
/**
* End the process to nable access for specified contract after delay period has passed.
*
* @dev ProxyRegistry owner only
* @param addr Address to which to grant permissions
*/
function endGrantAuthentication (address addr)
public
onlyOwner
{
require(!contracts[addr] && pending[addr] != 0 && ((pending[addr] + DELAY_PERIOD) < now));
pending[addr] = 0;
contracts[addr] = true;
}
/**
* Revoke access for specified contract. Can be done instantly.
*
* @dev ProxyRegistry owner only
* @param addr Address of which to revoke permissions
*/
function revokeAuthentication (address addr)
public
onlyOwner
{
contracts[addr] = false;
}
/**
* Register a proxy contract with this registry
*
* @dev Must be called by the user which the proxy is for, creates a new AuthenticatedProxy
* @return New AuthenticatedProxy contract
*/
function registerProxy()
public
returns (OwnableDelegateProxy proxy)
{
require(proxies[msg.sender] == address(0));
proxy = new OwnableDelegateProxy(msg.sender, delegateProxyImplementation, abi.encodeWithSignature("initialize(address,address)", msg.sender, address(this)));
proxies[msg.sender] = proxy;
return proxy;
}
}
contract WyvernProxyRegistry is ProxyRegistry {
string public constant name = "Project Wyvern Proxy Registry";
/* Whether the initial auth address has been set. */
bool public initialAddressSet = false;
constructor ()
public
{
delegateProxyImplementation = new AuthenticatedProxy();
}
/**
* Grant authentication to the initial Exchange protocol contract
*
* @dev No delay, can only be called once - after that the standard registry process with a delay must be used
* @param authAddress Address of the contract to grant authentication
*/
function grantInitialAuthentication (address authAddress)
onlyOwner
public
{
require(!initialAddressSet);
initialAddressSet = true;
contracts[authAddress] = true;
}
}
contract OwnedUpgradeabilityStorage {
// Current implementation
address internal _implementation;
// Owner of the contract
address private _upgradeabilityOwner;
/**
* @dev Tells the address of the owner
* @return the address of the owner
*/
function upgradeabilityOwner() public view returns (address) {
return _upgradeabilityOwner;
}
/**
* @dev Sets the address of the owner
*/
function setUpgradeabilityOwner(address newUpgradeabilityOwner) internal {
_upgradeabilityOwner = newUpgradeabilityOwner;
}
/**
* @dev Tells the address of the current implementation
* @return address of the current implementation
*/
function implementation() public view returns (address) {
return _implementation;
}
/**
* @dev Tells the proxy type (EIP 897)
* @return Proxy type, 2 for forwarding proxy
*/
function proxyType() public pure returns (uint256 proxyTypeId) {
return 2;
}
}
contract AuthenticatedProxy is TokenRecipient, OwnedUpgradeabilityStorage {
/* Whether initialized. */
bool initialized = false;
/* Address which owns this proxy. */
address public user;
/* Associated registry with contract authentication information. */
ProxyRegistry public registry;
/* Whether access has been revoked. */
bool public revoked;
/* Delegate call could be used to atomically transfer multiple assets owned by the proxy contract with one order. */
enum HowToCall { Call, DelegateCall }
/* Event fired when the proxy access is revoked or unrevoked. */
event Revoked(bool revoked);
/**
* Initialize an AuthenticatedProxy
*
* @param addrUser Address of user on whose behalf this proxy will act
* @param addrRegistry Address of ProxyRegistry contract which will manage this proxy
*/
function initialize (address addrUser, ProxyRegistry addrRegistry)
public
{
require(!initialized);
initialized = true;
user = addrUser;
registry = addrRegistry;
}
/**
* Set the revoked flag (allows a user to revoke ProxyRegistry access)
*
* @dev Can be called by the user only
* @param revoke Whether or not to revoke access
*/
function setRevoke(bool revoke)
public
{
require(msg.sender == user);
revoked = revoke;
emit Revoked(revoke);
}
/**
* Execute a message call from the proxy contract
*
* @dev Can be called by the user, or by a contract authorized by the registry as long as the user has not revoked access
* @param dest Address to which the call will be sent
* @param howToCall Which kind of call to make
* @param calldata Calldata to send
* @return Result of the call (success or failure)
*/
function proxy(address dest, HowToCall howToCall, bytes calldata)
public
returns (bool result)
{
require(msg.sender == user || (!revoked && registry.contracts(msg.sender)));
if (howToCall == HowToCall.Call) {
result = dest.call(calldata);
} else if (howToCall == HowToCall.DelegateCall) {
result = dest.delegatecall(calldata);
}
return result;
}
/**
* Execute a message call and assert success
*
* @dev Same functionality as `proxy`, just asserts the return value
* @param dest Address to which the call will be sent
* @param howToCall What kind of call to make
* @param calldata Calldata to send
*/
function proxyAssert(address dest, HowToCall howToCall, bytes calldata)
public
{
require(proxy(dest, howToCall, calldata));
}
}
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 type of proxy (EIP 897)
* @return Type of proxy, 2 for upgradeable proxy
*/
function proxyType() public pure returns (uint256 proxyTypeId);
/**
* @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) }
}
}
}
contract OwnedUpgradeabilityProxy is Proxy, OwnedUpgradeabilityStorage {
/**
* @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);
/**
* @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);
/**
* @dev Upgrades the implementation address
* @param implementation representing the address of the new implementation to be set
*/
function _upgradeTo(address implementation) internal {
require(_implementation != implementation);
_implementation = implementation;
emit Upgraded(implementation);
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyProxyOwner() {
require(msg.sender == proxyOwner());
_;
}
/**
* @dev Tells the address of the proxy owner
* @return the address of the proxy owner
*/
function proxyOwner() public view returns (address) {
return upgradeabilityOwner();
}
/**
* @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));
emit ProxyOwnershipTransferred(proxyOwner(), newOwner);
setUpgradeabilityOwner(newOwner);
}
/**
* @dev Allows the upgradeability owner to upgrade the current implementation of the proxy.
* @param implementation representing the address of the new implementation to be set.
*/
function upgradeTo(address implementation) public onlyProxyOwner {
_upgradeTo(implementation);
}
/**
* @dev Allows the upgradeability owner to upgrade the current implementation of the proxy
* and delegatecall the new implementation for initialization.
* @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, bytes data) payable public onlyProxyOwner {
upgradeTo(implementation);
require(address(this).delegatecall(data));
}
}
contract OwnableDelegateProxy is OwnedUpgradeabilityProxy {
constructor(address owner, address initialImplementation, bytes calldata)
public
{
setUpgradeabilityOwner(owner);
_upgradeTo(initialImplementation);
require(initialImplementation.delegatecall(calldata));
}
}
Compiler Settings
{"remappings":[],"optimizer":{"runs":200,"enabled":true},"libraries":{},"evmVersion":"byzantium","compilationTarget":{"WyvernProxyRegistry.sol":"WyvernProxyRegistry"}}
Contract ABI
[{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"string","name":""}],"name":"name","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"bool","name":""}],"name":"initialAddressSet","inputs":[],"constant":true},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"endGrantAuthentication","inputs":[{"type":"address","name":"addr"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"revokeAuthentication","inputs":[{"type":"address","name":"addr"}],"constant":false},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":""}],"name":"pending","inputs":[{"type":"address","name":""}],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"bool","name":""}],"name":"contracts","inputs":[{"type":"address","name":""}],"constant":true},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"renounceOwnership","inputs":[],"constant":false},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"address","name":""}],"name":"owner","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"address","name":""}],"name":"delegateProxyImplementation","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"address","name":""}],"name":"proxies","inputs":[{"type":"address","name":""}],"constant":true},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"startGrantAuthentication","inputs":[{"type":"address","name":"addr"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[{"type":"address","name":"proxy"}],"name":"registerProxy","inputs":[],"constant":false},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":""}],"name":"DELAY_PERIOD","inputs":[],"constant":true},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"grantInitialAuthentication","inputs":[{"type":"address","name":"authAddress"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"transferOwnership","inputs":[{"type":"address","name":"newOwner"}],"constant":false},{"type":"constructor","stateMutability":"nonpayable","payable":false,"inputs":[]},{"type":"event","name":"OwnershipRenounced","inputs":[{"type":"address","name":"previousOwner","indexed":true}],"anonymous":false},{"type":"event","name":"OwnershipTransferred","inputs":[{"type":"address","name":"previousOwner","indexed":true},{"type":"address","name":"newOwner","indexed":true}],"anonymous":false}]
Contract Creation Code
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