- Contract name:
- BrightIDSnapshot
- Optimization enabled
- false
- Compiler version
- v0.8.0+commit.c7dfd78e
- EVM Version
- default
- Verified at
- 2022-01-23 04:18:06.461251Z
Constructor Arguments
000000000000000000000000f917c019349dd70be96dea78e75dc679dcd323f7736e617073686f74000000000000000000000000000000000000000000000000
Arg [0] (address) : 0xf917c019349dd70be96dea78e75dc679dcd323f7
Arg [1] (bytes32) : 736e617073686f74000000000000000000000000000000000000000000000000
Contract source code
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
/**
* @dev Provides information about the current execution context, including the
* sender of the transaction and its data. While these are generally available
* via msg.sender and msg.data, they should not be accessed in such a direct
* manner, since when dealing with meta-transactions the account sending and
* paying for execution may not be the actual sender (as far as an application
* is concerned).
*
* This contract is only required for intermediate, library-like contracts.
*/
abstract contract Context {
function _msgSender() internal view virtual returns (address) {
return msg.sender;
}
function _msgData() internal view virtual returns (bytes calldata) {
return msg.data;
}
}
/**
* @dev Contract module which provides a basic access control mechanism, where
* there is an account (an owner) that can be granted exclusive access to
* specific functions.
*
* By default, the owner account will be the one that deploys the contract. This
* can later be changed with {transferOwnership}.
*
* This module is used through inheritance. It will make available the modifier
* `onlyOwner`, which can be applied to your functions to restrict their use to
* the owner.
*/
abstract contract Ownable is Context {
address private _owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
/**
* @dev Initializes the contract setting the deployer as the initial owner.
*/
constructor() {
_transferOwnership(_msgSender());
}
/**
* @dev Returns the address of the current owner.
*/
function owner() public view virtual returns (address) {
return _owner;
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
require(owner() == _msgSender(), "Ownable: caller is not the owner");
_;
}
/**
* @dev Leaves the contract without owner. It will not be possible to call
* `onlyOwner` functions anymore. Can only be called by the current owner.
*
* NOTE: Renouncing ownership will leave the contract without an owner,
* thereby removing any functionality that is only available to the owner.
*/
function renounceOwnership() public virtual onlyOwner {
_transferOwnership(address(0));
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Can only be called by the current owner.
*/
function transferOwnership(address newOwner) public virtual onlyOwner {
require(newOwner != address(0), "Ownable: new owner is the zero address");
_transferOwnership(newOwner);
}
/**
* @dev Transfers ownership of the contract to a new account (`newOwner`).
* Internal function without access restriction.
*/
function _transferOwnership(address newOwner) internal virtual {
address oldOwner = _owner;
_owner = newOwner;
emit OwnershipTransferred(oldOwner, newOwner);
}
}
/**
* @dev Interface of the ERC20 standard as defined in the EIP.
*/
interface IERC20 {
/**
* @dev Returns the amount of tokens in existence.
*/
function totalSupply() external view returns (uint256);
/**
* @dev Returns the amount of tokens owned by `account`.
*/
function balanceOf(address account) external view returns (uint256);
/**
* @dev Moves `amount` tokens from the caller's account to `recipient`.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transfer(address recipient, uint256 amount) external returns (bool);
/**
* @dev Returns the remaining number of tokens that `spender` will be
* allowed to spend on behalf of `owner` through {transferFrom}. This is
* zero by default.
*
* This value changes when {approve} or {transferFrom} are called.
*/
function allowance(address owner, address spender) external view returns (uint256);
/**
* @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* IMPORTANT: Beware that changing an allowance with this method brings the risk
* that someone may use both the old and the new allowance by unfortunate
* transaction ordering. One possible solution to mitigate this race
* condition is to first reduce the spender's allowance to 0 and set the
* desired value afterwards:
* https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
*
* Emits an {Approval} event.
*/
function approve(address spender, uint256 amount) external returns (bool);
/**
* @dev Moves `amount` tokens from `sender` to `recipient` using the
* allowance mechanism. `amount` is then deducted from the caller's
* allowance.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transferFrom(
address sender,
address recipient,
uint256 amount
) external returns (bool);
/**
* @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);
}
interface IBrightIDSnapshot {
event Verified(address indexed addr);
function isVerifiedUser(address _user) external view returns (bool);
function history(address addr) external view returns (address);
}
//-------------------Contracts-------------------------------
contract BrightIDSnapshot is Ownable, IBrightIDSnapshot {
//-------------------Storage-----------------------------
IERC20 public verifierToken; // Address of verification Token
bytes32 public app; // Registered BrightID app name
uint32 constant public REGISTRATION_PERIOD = 0; // A day
struct Verification {
uint256 time;
bool isVerified;
}
//-------------------Events-----------------------------
event VerifierTokenSet(IERC20 verifierToken);
event Sponsor(address indexed addr);
//-------------------Mappings---------------------------
mapping(address => Verification) public verifications;
mapping(address => address) override public history;
//-------------------Constructor-------------------------
/**
* @param _verifierToken verifier token
* @param _app BrightID app used for verifying users
*/
constructor(IERC20 _verifierToken, bytes32 _app) {
verifierToken = _verifierToken;
app = _app;
}
// emits a sponsor event for brightID nodes
function sponsor(address addr) public {
emit Sponsor(addr);
}
/**
* @notice Set verifier token
* @param _verifierToken verifier token
*/
function setVerifierToken(IERC20 _verifierToken) public onlyOwner {
verifierToken = _verifierToken;
emit VerifierTokenSet(_verifierToken);
}
/**
* @notice Register a user by BrightID verification
* @param addrs The history of addresses used by this user in the app
* @param timestamp The BrightID node's verification timestamp
* @param v Component of signature
* @param r Component of signature
* @param s Component of signature
*/
function verify(
address[] memory addrs,
uint timestamp,
uint8 v,
bytes32 r,
bytes32 s
) public {
require(verifications[addrs[0]].time < timestamp, "Newer verification registered before.");
require (timestamp > block.timestamp - REGISTRATION_PERIOD, "Verification too old. Try linking again.");
bytes32 message = keccak256(abi.encodePacked(app, addrs, timestamp));
address signer = ecrecover(message, v, r, s);
require(verifierToken.balanceOf(signer) > 0, "not authorized");
verifications[addrs[0]].time = timestamp;
verifications[addrs[0]].isVerified = true;
for(uint i = 1; i < addrs.length; i++) {
require(verifications[addrs[i]].time < block.timestamp - REGISTRATION_PERIOD * 2, "Address changed too recently. Wait for next registration period.");
verifications[addrs[i]].time = timestamp;
verifications[addrs[i]].isVerified = false;
history[addrs[i - 1]] = addrs[i];
}
emit Verified(addrs[0]);
}
/**
* @notice Check an address is verified or not
* @param _user The context id used for verifying users
*/
function isVerifiedUser(address _user) override external view returns (bool) {
return verifications[_user].isVerified;
}
}
Contract ABI
[{"type":"constructor","stateMutability":"nonpayable","inputs":[{"type":"address","name":"_verifierToken","internalType":"contract IERC20"},{"type":"bytes32","name":"_app","internalType":"bytes32"}]},{"type":"event","name":"OwnershipTransferred","inputs":[{"type":"address","name":"previousOwner","internalType":"address","indexed":true},{"type":"address","name":"newOwner","internalType":"address","indexed":true}],"anonymous":false},{"type":"event","name":"Sponsor","inputs":[{"type":"address","name":"addr","internalType":"address","indexed":true}],"anonymous":false},{"type":"event","name":"Verified","inputs":[{"type":"address","name":"addr","internalType":"address","indexed":true}],"anonymous":false},{"type":"event","name":"VerifierTokenSet","inputs":[{"type":"address","name":"verifierToken","internalType":"contract IERC20","indexed":false}],"anonymous":false},{"type":"function","stateMutability":"view","outputs":[{"type":"uint32","name":"","internalType":"uint32"}],"name":"REGISTRATION_PERIOD","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"bytes32","name":"","internalType":"bytes32"}],"name":"app","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"address"}],"name":"history","inputs":[{"type":"address","name":"","internalType":"address"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"isVerifiedUser","inputs":[{"type":"address","name":"_user","internalType":"address"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"address"}],"name":"owner","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"renounceOwnership","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"setVerifierToken","inputs":[{"type":"address","name":"_verifierToken","internalType":"contract IERC20"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"sponsor","inputs":[{"type":"address","name":"addr","internalType":"address"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"transferOwnership","inputs":[{"type":"address","name":"newOwner","internalType":"address"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"time","internalType":"uint256"},{"type":"bool","name":"isVerified","internalType":"bool"}],"name":"verifications","inputs":[{"type":"address","name":"","internalType":"address"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"contract IERC20"}],"name":"verifierToken","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"verify","inputs":[{"type":"address[]","name":"addrs","internalType":"address[]"},{"type":"uint256","name":"timestamp","internalType":"uint256"},{"type":"uint8","name":"v","internalType":"uint8"},{"type":"bytes32","name":"r","internalType":"bytes32"},{"type":"bytes32","name":"s","internalType":"bytes32"}]}]
Deployed ByteCode
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