Contract Address Details

0xd9Aa86e0Ddb932bD78ab8c71C1B98F83cF610Bd4

OneTimePayments Last Balance Update: Block #14194091
Created by 0x5128–22e4bb at 0x3a6d–a6a331

Balance

0 Fuse

Fetching tokens...

Contract name:
OneTimePayments




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




Optimization runs
200
EVM Version
default

Constructor Arguments

000000000000000000000000f96dadc6d71113f6500e97590760c924da1ef70e000000000000000000000000fa8d865a962ca8456df331d78806152d3ac5b84f

Arg [0] (address) : 0xf96dadc6d71113f6500e97590760c924da1ef70e
Arg [1] (address) : 0xfa8d865a962ca8456df331d78806152d3ac5b84f

              

Contract source code

/**
* Submitted for verification at blockscout.com on 2021-03-14 11:42:54.005809Z
*/
// SPDX-License-Identifier:
// File: openzeppelin-solidity/contracts/ownership/Ownable.sol
pragma solidity ^0.5.0;
/**
* @title Ownable
* @dev The Ownable contract has an owner address, and provides basic authorization control
* functions, this simplifies the implementation of "user permissions".
*/
contract Ownable {
address private _owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
/**
* @dev The Ownable constructor sets the original `owner` of the contract to the sender
* account.
*/
constructor () internal {
_owner = msg.sender;
emit OwnershipTransferred(address(0), _owner);
}
/**
* @return the address of the owner.
*/
function owner() public view returns (address) {
return _owner;
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
require(isOwner());
_;
}
/**
* @return true if `msg.sender` is the owner of the contract.
*/
function isOwner() public view returns (bool) {
return msg.sender == _owner;
}
/**
* @dev Allows the current owner to relinquish control of the contract.
* @notice Renouncing to ownership will leave the contract without an owner.
* It will not be possible to call the functions with the `onlyOwner`
* modifier anymore.
*/
function renounceOwnership() public onlyOwner {
emit OwnershipTransferred(_owner, address(0));
_owner = address(0);
}
/**
* @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 {
_transferOwnership(newOwner);
}
/**
* @dev Transfers control of the contract to a newOwner.
* @param newOwner The address to transfer ownership to.
*/
function _transferOwnership(address newOwner) internal {
require(newOwner != address(0));
emit OwnershipTransferred(_owner, newOwner);
_owner = newOwner;
}
}
// File: @daostack/infra/contracts/Reputation.sol
/**
* @title Reputation system
* @dev A DAO has Reputation System which allows peers to rate other peers in order to build trust .
* A reputation is use to assign influence measure to a DAO'S peers.
* Reputation is similar to regular tokens but with one crucial difference: It is non-transferable.
* The Reputation contract maintain a map of address to reputation value.
* It provides an onlyOwner functions to mint and burn reputation _to (or _from) a specific address.
*/
contract Reputation is Ownable {
uint8 public decimals = 18; //Number of decimals of the smallest unit
// Event indicating minting of reputation to an address.
event Mint(address indexed _to, uint256 _amount);
// Event indicating burning of reputation for an address.
event Burn(address indexed _from, uint256 _amount);
/// @dev `Checkpoint` is the structure that attaches a block number to a
/// given value, the block number attached is the one that last changed the
/// value
struct Checkpoint {
// `fromBlock` is the block number that the value was generated from
uint128 fromBlock;
// `value` is the amount of reputation at a specific block number
uint128 value;
}
// `balances` is the map that tracks the balance of each address, in this
// contract when the balance changes the block number that the change
// occurred is also included in the map
mapping (address => Checkpoint[]) balances;
// Tracks the history of the `totalSupply` of the reputation
Checkpoint[] totalSupplyHistory;
/// @notice Constructor to create a Reputation
constructor(
) public
{
}
/// @dev This function makes it easy to get the total number of reputation
/// @return The total number of reputation
function totalSupply() public view returns (uint256) {
return totalSupplyAt(block.number);
}
////////////////
// Query balance and totalSupply in History
////////////////
/**
* @dev return the reputation amount of a given owner
* @param _owner an address of the owner which we want to get his reputation
*/
function balanceOf(address _owner) public view returns (uint256 balance) {
return balanceOfAt(_owner, block.number);
}
/// @dev Queries the balance of `_owner` at a specific `_blockNumber`
/// @param _owner The address from which the balance will be retrieved
/// @param _blockNumber The block number when the balance is queried
/// @return The balance at `_blockNumber`
function balanceOfAt(address _owner, uint256 _blockNumber)
public view returns (uint256)
{
if ((balances[_owner].length == 0) || (balances[_owner][0].fromBlock > _blockNumber)) {
return 0;
// This will return the expected balance during normal situations
} else {
return getValueAt(balances[_owner], _blockNumber);
}
}
/// @notice Total amount of reputation at a specific `_blockNumber`.
/// @param _blockNumber The block number when the totalSupply is queried
/// @return The total amount of reputation at `_blockNumber`
function totalSupplyAt(uint256 _blockNumber) public view returns(uint256) {
if ((totalSupplyHistory.length == 0) || (totalSupplyHistory[0].fromBlock > _blockNumber)) {
return 0;
// This will return the expected totalSupply during normal situations
} else {
return getValueAt(totalSupplyHistory, _blockNumber);
}
}
/// @notice Generates `_amount` reputation that are assigned to `_owner`
/// @param _user The address that will be assigned the new reputation
/// @param _amount The quantity of reputation generated
/// @return True if the reputation are generated correctly
function mint(address _user, uint256 _amount) public onlyOwner returns (bool) {
uint256 curTotalSupply = totalSupply();
require(curTotalSupply + _amount >= curTotalSupply); // Check for overflow
uint256 previousBalanceTo = balanceOf(_user);
require(previousBalanceTo + _amount >= previousBalanceTo); // Check for overflow
updateValueAtNow(totalSupplyHistory, curTotalSupply + _amount);
updateValueAtNow(balances[_user], previousBalanceTo + _amount);
emit Mint(_user, _amount);
return true;
}
/// @notice Burns `_amount` reputation from `_owner`
/// @param _user The address that will lose the reputation
/// @param _amount The quantity of reputation to burn
/// @return True if the reputation are burned correctly
function burn(address _user, uint256 _amount) public onlyOwner returns (bool) {
uint256 curTotalSupply = totalSupply();
uint256 amountBurned = _amount;
uint256 previousBalanceFrom = balanceOf(_user);
if (previousBalanceFrom < amountBurned) {
amountBurned = previousBalanceFrom;
}
updateValueAtNow(totalSupplyHistory, curTotalSupply - amountBurned);
updateValueAtNow(balances[_user], previousBalanceFrom - amountBurned);
emit Burn(_user, amountBurned);
return true;
}
////////////////
// Internal helper functions to query and set a value in a snapshot array
////////////////
/// @dev `getValueAt` retrieves the number of reputation at a given block number
/// @param checkpoints The history of values being queried
/// @param _block The block number to retrieve the value at
/// @return The number of reputation being queried
function getValueAt(Checkpoint[] storage checkpoints, uint256 _block) internal view returns (uint256) {
if (checkpoints.length == 0) {
return 0;
}
// Shortcut for the actual value
if (_block >= checkpoints[checkpoints.length-1].fromBlock) {
return checkpoints[checkpoints.length-1].value;
}
if (_block < checkpoints[0].fromBlock) {
return 0;
}
// Binary search of the value in the array
uint256 min = 0;
uint256 max = checkpoints.length-1;
while (max > min) {
uint256 mid = (max + min + 1) / 2;
if (checkpoints[mid].fromBlock<=_block) {
min = mid;
} else {
max = mid-1;
}
}
return checkpoints[min].value;
}
/// @dev `updateValueAtNow` used to update the `balances` map and the
/// `totalSupplyHistory`
/// @param checkpoints The history of data being updated
/// @param _value The new number of reputation
function updateValueAtNow(Checkpoint[] storage checkpoints, uint256 _value) internal {
require(uint128(_value) == _value); //check value is in the 128 bits bounderies
if ((checkpoints.length == 0) || (checkpoints[checkpoints.length - 1].fromBlock < block.number)) {
Checkpoint storage newCheckPoint = checkpoints[checkpoints.length++];
newCheckPoint.fromBlock = uint128(block.number);
newCheckPoint.value = uint128(_value);
} else {
Checkpoint storage oldCheckPoint = checkpoints[checkpoints.length-1];
oldCheckPoint.value = uint128(_value);
}
}
}
// File: openzeppelin-solidity/contracts/token/ERC20/IERC20.sol
/**
* @title ERC20 interface
* @dev see https://github.com/ethereum/EIPs/issues/20
*/
interface IERC20 {
function transfer(address to, uint256 value) external returns (bool);
function approve(address spender, uint256 value) external returns (bool);
function transferFrom(address from, address to, uint256 value) external returns (bool);
function totalSupply() external view returns (uint256);
function balanceOf(address who) external view returns (uint256);
function allowance(address owner, address spender) external view returns (uint256);
event Transfer(address indexed from, address indexed to, uint256 value);
event Approval(address indexed owner, address indexed spender, uint256 value);
}
// File: openzeppelin-solidity/contracts/math/SafeMath.sol
/**
* @title SafeMath
* @dev Unsigned math operations with safety checks that revert on error
*/
library SafeMath {
/**
* @dev Multiplies two unsigned integers, reverts on 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-solidity/pull/522
if (a == 0) {
return 0;
}
uint256 c = a * b;
require(c / a == b);
return c;
}
/**
* @dev Integer division of two unsigned integers truncating the quotient, reverts on division by zero.
*/
function div(uint256 a, uint256 b) internal pure returns (uint256) {
// Solidity only automatically asserts when dividing by 0
require(b > 0);
uint256 c = a / b;
// assert(a == b * c + a % b); // There is no case in which this doesn't hold
return c;
}
/**
* @dev Subtracts two unsigned integers, reverts on overflow (i.e. if subtrahend is greater than minuend).
*/
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
require(b <= a);
uint256 c = a - b;
return c;
}
/**
* @dev Adds two unsigned integers, reverts on overflow.
*/
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
require(c >= a);
return c;
}
/**
* @dev Divides two unsigned integers and returns the remainder (unsigned integer modulo),
* reverts when dividing by zero.
*/
function mod(uint256 a, uint256 b) internal pure returns (uint256) {
require(b != 0);
return a % b;
}
}
// File: openzeppelin-solidity/contracts/token/ERC20/ERC20.sol
/**
* @title Standard ERC20 token
*
* @dev Implementation of the basic standard token.
* https://github.com/ethereum/EIPs/blob/master/EIPS/eip-20.md
* Originally based on code by FirstBlood:
* https://github.com/Firstbloodio/token/blob/master/smart_contract/FirstBloodToken.sol
*
* This implementation emits additional Approval events, allowing applications to reconstruct the allowance status for
* all accounts just by listening to said events. Note that this isn't required by the specification, and other
* compliant implementations may not do it.
*/
contract ERC20 is IERC20 {
using SafeMath for uint256;
mapping (address => uint256) private _balances;
mapping (address => mapping (address => uint256)) private _allowed;
uint256 private _totalSupply;
/**
* @dev Total number of tokens in existence
*/
function totalSupply() public view returns (uint256) {
return _totalSupply;
}
/**
* @dev Gets the balance of the specified address.
* @param owner The address to query the balance of.
* @return An uint256 representing the amount owned by the passed address.
*/
function balanceOf(address owner) public view returns (uint256) {
return _balances[owner];
}
/**
* @dev Function to check the amount of tokens that an owner allowed to a spender.
* @param owner address The address which owns the funds.
* @param spender address The address which will spend the funds.
* @return A uint256 specifying the amount of tokens still available for the spender.
*/
function allowance(address owner, address spender) public view returns (uint256) {
return _allowed[owner][spender];
}
/**
* @dev Transfer token for a specified address
* @param to The address to transfer to.
* @param value The amount to be transferred.
*/
function transfer(address to, uint256 value) public returns (bool) {
_transfer(msg.sender, to, value);
return true;
}
/**
* @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
* 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
* @param spender The address which will spend the funds.
* @param value The amount of tokens to be spent.
*/
function approve(address spender, uint256 value) public returns (bool) {
require(spender != address(0));
_allowed[msg.sender][spender] = value;
emit Approval(msg.sender, spender, value);
return true;
}
/**
* @dev Transfer tokens from one address to another.
* Note that while this function emits an Approval event, this is not required as per the specification,
* and other compliant implementations may not emit the event.
* @param from address The address which you want to send tokens from
* @param to address The address which you want to transfer to
* @param value uint256 the amount of tokens to be transferred
*/
function transferFrom(address from, address to, uint256 value) public returns (bool) {
_allowed[from][msg.sender] = _allowed[from][msg.sender].sub(value);
_transfer(from, to, value);
emit Approval(from, msg.sender, _allowed[from][msg.sender]);
return true;
}
/**
* @dev Increase the amount of tokens that an owner allowed to a spender.
* approve should be called when allowed_[_spender] == 0. To increment
* allowed value is better to use this function to avoid 2 calls (and wait until
* the first transaction is mined)
* From MonolithDAO Token.sol
* Emits an Approval event.
* @param spender The address which will spend the funds.
* @param addedValue The amount of tokens to increase the allowance by.
*/
function increaseAllowance(address spender, uint256 addedValue) public returns (bool) {
require(spender != address(0));
_allowed[msg.sender][spender] = _allowed[msg.sender][spender].add(addedValue);
emit Approval(msg.sender, spender, _allowed[msg.sender][spender]);
return true;
}
/**
* @dev Decrease the amount of tokens that an owner allowed to a spender.
* approve should be called when allowed_[_spender] == 0. To decrement
* allowed value is better to use this function to avoid 2 calls (and wait until
* the first transaction is mined)
* From MonolithDAO Token.sol
* Emits an Approval event.
* @param spender The address which will spend the funds.
* @param subtractedValue The amount of tokens to decrease the allowance by.
*/
function decreaseAllowance(address spender, uint256 subtractedValue) public returns (bool) {
require(spender != address(0));
_allowed[msg.sender][spender] = _allowed[msg.sender][spender].sub(subtractedValue);
emit Approval(msg.sender, spender, _allowed[msg.sender][spender]);
return true;
}
/**
* @dev Transfer token for a specified addresses
* @param from The address to transfer from.
* @param to The address to transfer to.
* @param value The amount to be transferred.
*/
function _transfer(address from, address to, uint256 value) internal {
require(to != address(0));
_balances[from] = _balances[from].sub(value);
_balances[to] = _balances[to].add(value);
emit Transfer(from, to, value);
}
/**
* @dev Internal function that mints an amount of the token and assigns it to
* an account. This encapsulates the modification of balances such that the
* proper events are emitted.
* @param account The account that will receive the created tokens.
* @param value The amount that will be created.
*/
function _mint(address account, uint256 value) internal {
require(account != address(0));
_totalSupply = _totalSupply.add(value);
_balances[account] = _balances[account].add(value);
emit Transfer(address(0), account, value);
}
/**
* @dev Internal function that burns an amount of the token of a given
* account.
* @param account The account whose tokens will be burnt.
* @param value The amount that will be burnt.
*/
function _burn(address account, uint256 value) internal {
require(account != address(0));
_totalSupply = _totalSupply.sub(value);
_balances[account] = _balances[account].sub(value);
emit Transfer(account, address(0), value);
}
/**
* @dev Internal function that burns an amount of the token of a given
* account, deducting from the sender's allowance for said account. Uses the
* internal burn function.
* Emits an Approval event (reflecting the reduced allowance).
* @param account The account whose tokens will be burnt.
* @param value The amount that will be burnt.
*/
function _burnFrom(address account, uint256 value) internal {
_allowed[account][msg.sender] = _allowed[account][msg.sender].sub(value);
_burn(account, value);
emit Approval(account, msg.sender, _allowed[account][msg.sender]);
}
}
// File: openzeppelin-solidity/contracts/token/ERC20/ERC20Burnable.sol
/**
* @title Burnable Token
* @dev Token that can be irreversibly burned (destroyed).
*/
contract ERC20Burnable is ERC20 {
/**
* @dev Burns a specific amount of tokens.
* @param value The amount of token to be burned.
*/
function burn(uint256 value) public {
_burn(msg.sender, value);
}
/**
* @dev Burns a specific amount of tokens from the target address and decrements allowance
* @param from address The address which you want to send tokens from
* @param value uint256 The amount of token to be burned
*/
function burnFrom(address from, uint256 value) public {
_burnFrom(from, value);
}
}
// File: @daostack/arc/contracts/controller/DAOToken.sol
/**
* @title DAOToken, base on zeppelin contract.
* @dev ERC20 compatible token. It is a mintable, burnable token.
*/
contract DAOToken is ERC20, ERC20Burnable, Ownable {
string public name;
string public symbol;
// solhint-disable-next-line const-name-snakecase
uint8 public constant decimals = 18;
uint256 public cap;
/**
* @dev Constructor
* @param _name - token name
* @param _symbol - token symbol
* @param _cap - token cap - 0 value means no cap
*/
constructor(string memory _name, string memory _symbol, uint256 _cap)
public {
name = _name;
symbol = _symbol;
cap = _cap;
}
/**
* @dev Function to mint tokens
* @param _to The address that will receive the minted tokens.
* @param _amount The amount of tokens to mint.
*/
function mint(address _to, uint256 _amount) public onlyOwner returns (bool) {
if (cap > 0)
require(totalSupply().add(_amount) <= cap);
_mint(_to, _amount);
return true;
}
}
// File: openzeppelin-solidity/contracts/utils/Address.sol
/**
* Utility library of inline functions on addresses
*/
library Address {
/**
* Returns whether the target address is a contract
* @dev This function will return false if invoked during the constructor of a contract,
* as the code is not actually created until after the constructor finishes.
* @param account address of the account to check
* @return whether the target address is a contract
*/
function isContract(address account) internal view returns (bool) {
uint256 size;
// XXX Currently there is no better way to check if there is a contract in an address
// than to check the size of the code at that address.
// See https://ethereum.stackexchange.com/a/14016/36603
// for more details about how this works.
// TODO Check this again before the Serenity release, because all addresses will be
// contracts then.
// solhint-disable-next-line no-inline-assembly
assembly { size := extcodesize(account) }
return size > 0;
}
}
// File: @daostack/arc/contracts/libs/SafeERC20.sol
/*
SafeERC20 by daostack.
The code is based on a fix by SECBIT Team.
USE WITH CAUTION & NO WARRANTY
REFERENCE & RELATED READING
- https://github.com/ethereum/solidity/issues/4116
- https://medium.com/@chris_77367/explaining-unexpected-reverts-starting-with-solidity-0-4-22-3ada6e82308c
- https://medium.com/coinmonks/missing-return-value-bug-at-least-130-tokens-affected-d67bf08521ca
- https://gist.github.com/BrendanChou/88a2eeb80947ff00bcf58ffdafeaeb61
*/
library SafeERC20 {
using Address for address;
bytes4 constant private TRANSFER_SELECTOR = bytes4(keccak256(bytes("transfer(address,uint256)")));
bytes4 constant private TRANSFERFROM_SELECTOR = bytes4(keccak256(bytes("transferFrom(address,address,uint256)")));
bytes4 constant private APPROVE_SELECTOR = bytes4(keccak256(bytes("approve(address,uint256)")));
function safeTransfer(address _erc20Addr, address _to, uint256 _value) internal {
// Must be a contract addr first!
require(_erc20Addr.isContract());
(bool success, bytes memory returnValue) =
// solhint-disable-next-line avoid-low-level-calls
_erc20Addr.call(abi.encodeWithSelector(TRANSFER_SELECTOR, _to, _value));
// call return false when something wrong
require(success);
//check return value
require(returnValue.length == 0 || (returnValue.length == 32 && (returnValue[31] != 0)));
}
function safeTransferFrom(address _erc20Addr, address _from, address _to, uint256 _value) internal {
// Must be a contract addr first!
require(_erc20Addr.isContract());
(bool success, bytes memory returnValue) =
// solhint-disable-next-line avoid-low-level-calls
_erc20Addr.call(abi.encodeWithSelector(TRANSFERFROM_SELECTOR, _from, _to, _value));
// call return false when something wrong
require(success);
//check return value
require(returnValue.length == 0 || (returnValue.length == 32 && (returnValue[31] != 0)));
}
function safeApprove(address _erc20Addr, address _spender, uint256 _value) internal {
// Must be a contract addr first!
require(_erc20Addr.isContract());
// safeApprove should only be called when setting an initial allowance,
// or when resetting it to zero.
require((_value == 0) || (IERC20(_erc20Addr).allowance(address(this), _spender) == 0));
(bool success, bytes memory returnValue) =
// solhint-disable-next-line avoid-low-level-calls
_erc20Addr.call(abi.encodeWithSelector(APPROVE_SELECTOR, _spender, _value));
// call return false when something wrong
require(success);
//check return value
require(returnValue.length == 0 || (returnValue.length == 32 && (returnValue[31] != 0)));
}
}
// File: @daostack/arc/contracts/controller/Avatar.sol
/**
* @title An Avatar holds tokens, reputation and ether for a controller
*/
contract Avatar is Ownable {
using SafeERC20 for address;
string public orgName;
DAOToken public nativeToken;
Reputation public nativeReputation;
event GenericCall(address indexed _contract, bytes _data, uint _value, bool _success);
event SendEther(uint256 _amountInWei, address indexed _to);
event ExternalTokenTransfer(address indexed _externalToken, address indexed _to, uint256 _value);
event ExternalTokenTransferFrom(address indexed _externalToken, address _from, address _to, uint256 _value);
event ExternalTokenApproval(address indexed _externalToken, address _spender, uint256 _value);
event ReceiveEther(address indexed _sender, uint256 _value);
event MetaData(string _metaData);
/**
* @dev the constructor takes organization name, native token and reputation system
and creates an avatar for a controller
*/
constructor(string memory _orgName, DAOToken _nativeToken, Reputation _nativeReputation) public {
orgName = _orgName;
nativeToken = _nativeToken;
nativeReputation = _nativeReputation;
}
/**
* @dev enables an avatar to receive ethers
*/
function() external payable {
emit ReceiveEther(msg.sender, msg.value);
}
/**
* @dev perform a generic call to an arbitrary contract
* @param _contract the contract's address to call
* @param _data ABI-encoded contract call to call `_contract` address.
* @param _value value (ETH) to transfer with the transaction
* @return bool success or fail
* bytes - the return bytes of the called contract's function.
*/
function genericCall(address _contract, bytes memory _data, uint256 _value)
public
onlyOwner
returns(bool success, bytes memory returnValue) {
// solhint-disable-next-line avoid-call-value
(success, returnValue) = _contract.call.value(_value)(_data);
emit GenericCall(_contract, _data, _value, success);
}
/**
* @dev send ethers from the avatar's wallet
* @param _amountInWei amount to send in Wei units
* @param _to send the ethers to this address
* @return bool which represents success
*/
function sendEther(uint256 _amountInWei, address payable _to) public onlyOwner returns(bool) {
_to.transfer(_amountInWei);
emit SendEther(_amountInWei, _to);
return true;
}
/**
* @dev external token transfer
* @param _externalToken the token contract
* @param _to the destination address
* @param _value the amount of tokens to transfer
* @return bool which represents success
*/
function externalTokenTransfer(IERC20 _externalToken, address _to, uint256 _value)
public onlyOwner returns(bool)
{
address(_externalToken).safeTransfer(_to, _value);
emit ExternalTokenTransfer(address(_externalToken), _to, _value);
return true;
}
/**
* @dev external token transfer from a specific account
* @param _externalToken the token contract
* @param _from the account to spend token from
* @param _to the destination address
* @param _value the amount of tokens to transfer
* @return bool which represents success
*/
function externalTokenTransferFrom(
IERC20 _externalToken,
address _from,
address _to,
uint256 _value
)
public onlyOwner returns(bool)
{
address(_externalToken).safeTransferFrom(_from, _to, _value);
emit ExternalTokenTransferFrom(address(_externalToken), _from, _to, _value);
return true;
}
/**
* @dev externalTokenApproval approve the spender address to spend a specified amount of tokens
* on behalf of msg.sender.
* @param _externalToken the address of the Token Contract
* @param _spender address
* @param _value the amount of ether (in Wei) which the approval is referring to.
* @return bool which represents a success
*/
function externalTokenApproval(IERC20 _externalToken, address _spender, uint256 _value)
public onlyOwner returns(bool)
{
address(_externalToken).safeApprove(_spender, _value);
emit ExternalTokenApproval(address(_externalToken), _spender, _value);
return true;
}
/**
* @dev metaData emits an event with a string, should contain the hash of some meta data.
* @param _metaData a string representing a hash of the meta data
* @return bool which represents a success
*/
function metaData(string memory _metaData) public onlyOwner returns(bool) {
emit MetaData(_metaData);
return true;
}
}
// File: openzeppelin-solidity/contracts/cryptography/ECDSA.sol
/**
* @title Elliptic curve signature operations
* @dev Based on https://gist.github.com/axic/5b33912c6f61ae6fd96d6c4a47afde6d
* TODO Remove this library once solidity supports passing a signature to ecrecover.
* See https://github.com/ethereum/solidity/issues/864
*/
library ECDSA {
/**
* @dev Recover signer address from a message by using their signature
* @param hash bytes32 message, the hash is the signed message. What is recovered is the signer address.
* @param signature bytes signature, the signature is generated using web3.eth.sign()
*/
function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {
bytes32 r;
bytes32 s;
uint8 v;
// Check the signature length
if (signature.length != 65) {
return (address(0));
}
// Divide the signature in r, s and v variables
// ecrecover takes the signature parameters, and the only way to get them
// currently is to use assembly.
// solhint-disable-next-line no-inline-assembly
assembly {
r := mload(add(signature, 0x20))
s := mload(add(signature, 0x40))
v := byte(0, mload(add(signature, 0x60)))
}
// Version of signature should be 27 or 28, but 0 and 1 are also possible versions
if (v < 27) {
v += 27;
}
// If the version is correct return the signer address
if (v != 27 && v != 28) {
return (address(0));
} else {
return ecrecover(hash, v, r, s);
}
}
/**
* toEthSignedMessageHash
* @dev prefix a bytes32 value with "\x19Ethereum Signed Message:"
* and hash the result
*/
function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32) {
// 32 is the length in bytes of hash,
// enforced by the type signature above
return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash));
}
}
// File: @daostack/arc/contracts/globalConstraints/GlobalConstraintInterface.sol
contract GlobalConstraintInterface {
enum CallPhase { Pre, Post, PreAndPost }
function pre( address _scheme, bytes32 _params, bytes32 _method ) public returns(bool);
function post( address _scheme, bytes32 _params, bytes32 _method ) public returns(bool);
/**
* @dev when return if this globalConstraints is pre, post or both.
* @return CallPhase enum indication Pre, Post or PreAndPost.
*/
function when() public returns(CallPhase);
}
// File: @daostack/arc/contracts/controller/ControllerInterface.sol
/**
* @title Controller contract
* @dev A controller controls the organizations tokens ,reputation and avatar.
* It is subject to a set of schemes and constraints that determine its behavior.
* Each scheme has it own parameters and operation permissions.
*/
interface ControllerInterface {
/**
* @dev Mint `_amount` of reputation that are assigned to `_to` .
* @param _amount amount of reputation to mint
* @param _to beneficiary address
* @return bool which represents a success
*/
function mintReputation(uint256 _amount, address _to, address _avatar)
external
returns(bool);
/**
* @dev Burns `_amount` of reputation from `_from`
* @param _amount amount of reputation to burn
* @param _from The address that will lose the reputation
* @return bool which represents a success
*/
function burnReputation(uint256 _amount, address _from, address _avatar)
external
returns(bool);
/**
* @dev mint tokens .
* @param _amount amount of token to mint
* @param _beneficiary beneficiary address
* @param _avatar address
* @return bool which represents a success
*/
function mintTokens(uint256 _amount, address _beneficiary, address _avatar)
external
returns(bool);
/**
* @dev register or update a scheme
* @param _scheme the address of the scheme
* @param _paramsHash a hashed configuration of the usage of the scheme
* @param _permissions the permissions the new scheme will have
* @param _avatar address
* @return bool which represents a success
*/
function registerScheme(address _scheme, bytes32 _paramsHash, bytes4 _permissions, address _avatar)
external
returns(bool);
/**
* @dev unregister a scheme
* @param _avatar address
* @param _scheme the address of the scheme
* @return bool which represents a success
*/
function unregisterScheme(address _scheme, address _avatar)
external
returns(bool);
/**
* @dev unregister the caller's scheme
* @param _avatar address
* @return bool which represents a success
*/
function unregisterSelf(address _avatar) external returns(bool);
/**
* @dev add or update Global Constraint
* @param _globalConstraint the address of the global constraint to be added.
* @param _params the constraint parameters hash.
* @param _avatar the avatar of the organization
* @return bool which represents a success
*/
function addGlobalConstraint(address _globalConstraint, bytes32 _params, address _avatar)
external returns(bool);
/**
* @dev remove Global Constraint
* @param _globalConstraint the address of the global constraint to be remove.
* @param _avatar the organization avatar.
* @return bool which represents a success
*/
function removeGlobalConstraint (address _globalConstraint, address _avatar)
external returns(bool);
/**
* @dev upgrade the Controller
* The function will trigger an event 'UpgradeController'.
* @param _newController the address of the new controller.
* @param _avatar address
* @return bool which represents a success
*/
function upgradeController(address _newController, Avatar _avatar)
external returns(bool);
/**
* @dev perform a generic call to an arbitrary contract
* @param _contract the contract's address to call
* @param _data ABI-encoded contract call to call `_contract` address.
* @param _avatar the controller's avatar address
* @param _value value (ETH) to transfer with the transaction
* @return bool -success
* bytes - the return value of the called _contract's function.
*/
function genericCall(address _contract, bytes calldata _data, Avatar _avatar, uint256 _value)
external
returns(bool, bytes memory);
/**
* @dev send some ether
* @param _amountInWei the amount of ether (in Wei) to send
* @param _to address of the beneficiary
* @param _avatar address
* @return bool which represents a success
*/
function sendEther(uint256 _amountInWei, address payable _to, Avatar _avatar)
external returns(bool);
/**
* @dev send some amount of arbitrary ERC20 Tokens
* @param _externalToken the address of the Token Contract
* @param _to address of the beneficiary
* @param _value the amount of ether (in Wei) to send
* @param _avatar address
* @return bool which represents a success
*/
function externalTokenTransfer(IERC20 _externalToken, address _to, uint256 _value, Avatar _avatar)
external
returns(bool);
/**
* @dev transfer token "from" address "to" address
* One must to approve the amount of tokens which can be spend from the
* "from" account.This can be done using externalTokenApprove.
* @param _externalToken the address of the Token Contract
* @param _from address of the account to send from
* @param _to address of the beneficiary
* @param _value the amount of ether (in Wei) to send
* @param _avatar address
* @return bool which represents a success
*/
function externalTokenTransferFrom(
IERC20 _externalToken,
address _from,
address _to,
uint256 _value,
Avatar _avatar)
external
returns(bool);
/**
* @dev externalTokenApproval approve the spender address to spend a specified amount of tokens
* on behalf of msg.sender.
* @param _externalToken the address of the Token Contract
* @param _spender address
* @param _value the amount of ether (in Wei) which the approval is referring to.
* @return bool which represents a success
*/
function externalTokenApproval(IERC20 _externalToken, address _spender, uint256 _value, Avatar _avatar)
external
returns(bool);
/**
* @dev metaData emits an event with a string, should contain the hash of some meta data.
* @param _metaData a string representing a hash of the meta data
* @param _avatar Avatar
* @return bool which represents a success
*/
function metaData(string calldata _metaData, Avatar _avatar) external returns(bool);
/**
* @dev getNativeReputation
* @param _avatar the organization avatar.
* @return organization native reputation
*/
function getNativeReputation(address _avatar)
external
view
returns(address);
function isSchemeRegistered( address _scheme, address _avatar) external view returns(bool);
function getSchemeParameters(address _scheme, address _avatar) external view returns(bytes32);
function getGlobalConstraintParameters(address _globalConstraint, address _avatar) external view returns(bytes32);
function getSchemePermissions(address _scheme, address _avatar) external view returns(bytes4);
/**
* @dev globalConstraintsCount return the global constraint pre and post count
* @return uint256 globalConstraintsPre count.
* @return uint256 globalConstraintsPost count.
*/
function globalConstraintsCount(address _avatar) external view returns(uint, uint);
function isGlobalConstraintRegistered(address _globalConstraint, address _avatar) external view returns(bool);
}
// File: contracts/dao/schemes/SchemeGuard.sol
/* @dev abstract contract for ensuring that schemes have been registered properly
* Allows setting zero Avatar in situations where the Avatar hasn't been created yet
*/
contract SchemeGuard is Ownable {
Avatar avatar;
ControllerInterface internal controller = ControllerInterface(0);
/** @dev Constructor. only sets controller if given avatar is not null.
* @param _avatar The avatar of the DAO.
*/
constructor(Avatar _avatar) public {
avatar = _avatar;
if (avatar != Avatar(0)) {
controller = ControllerInterface(avatar.owner());
}
}
/** @dev modifier to check if caller is avatar
*/
modifier onlyAvatar() {
require(address(avatar) == msg.sender, "only Avatar can call this method");
_;
}
/** @dev modifier to check if scheme is registered
*/
modifier onlyRegistered() {
require(isRegistered(), "Scheme is not registered");
_;
}
/** @dev modifier to check if scheme is not registered
*/
modifier onlyNotRegistered() {
require(!isRegistered(), "Scheme is registered");
_;
}
/** @dev modifier to check if call is a scheme that is registered
*/
modifier onlyRegisteredCaller() {
require(isRegistered(msg.sender), "Calling scheme is not registered");
_;
}
/** @dev Function to set a new avatar and controller for scheme
* can only be done by owner of scheme
*/
function setAvatar(Avatar _avatar) public onlyOwner {
avatar = _avatar;
controller = ControllerInterface(avatar.owner());
}
/** @dev function to see if an avatar has been set and if this scheme is registered
* @return true if scheme is registered
*/
function isRegistered() public view returns (bool) {
return isRegistered(address(this));
}
/** @dev function to see if an avatar has been set and if this scheme is registered
* @return true if scheme is registered
*/
function isRegistered(address scheme) public view returns (bool) {
require(avatar != Avatar(0), "Avatar is not set");
if (!(controller.isSchemeRegistered(scheme, address(avatar)))) {
return false;
}
return true;
}
}
// File: openzeppelin-solidity/contracts/access/Roles.sol
/**
* @title Roles
* @dev Library for managing addresses assigned to a Role.
*/
library Roles {
struct Role {
mapping (address => bool) bearer;
}
/**
* @dev give an account access to this role
*/
function add(Role storage role, address account) internal {
require(account != address(0));
require(!has(role, account));
role.bearer[account] = true;
}
/**
* @dev remove an account's access to this role
*/
function remove(Role storage role, address account) internal {
require(account != address(0));
require(has(role, account));
role.bearer[account] = false;
}
/**
* @dev check if an account has this role
* @return bool
*/
function has(Role storage role, address account) internal view returns (bool) {
require(account != address(0));
return role.bearer[account];
}
}
// File: openzeppelin-solidity/contracts/access/roles/PauserRole.sol
contract PauserRole {
using Roles for Roles.Role;
event PauserAdded(address indexed account);
event PauserRemoved(address indexed account);
Roles.Role private _pausers;
constructor () internal {
_addPauser(msg.sender);
}
modifier onlyPauser() {
require(isPauser(msg.sender));
_;
}
function isPauser(address account) public view returns (bool) {
return _pausers.has(account);
}
function addPauser(address account) public onlyPauser {
_addPauser(account);
}
function renouncePauser() public {
_removePauser(msg.sender);
}
function _addPauser(address account) internal {
_pausers.add(account);
emit PauserAdded(account);
}
function _removePauser(address account) internal {
_pausers.remove(account);
emit PauserRemoved(account);
}
}
// File: openzeppelin-solidity/contracts/lifecycle/Pausable.sol
/**
* @title Pausable
* @dev Base contract which allows children to implement an emergency stop mechanism.
*/
contract Pausable is PauserRole {
event Paused(address account);
event Unpaused(address account);
bool private _paused;
constructor () internal {
_paused = false;
}
/**
* @return true if the contract is paused, false otherwise.
*/
function paused() public view returns (bool) {
return _paused;
}
/**
* @dev Modifier to make a function callable only when the contract is not paused.
*/
modifier whenNotPaused() {
require(!_paused);
_;
}
/**
* @dev Modifier to make a function callable only when the contract is paused.
*/
modifier whenPaused() {
require(_paused);
_;
}
/**
* @dev called by the owner to pause, triggers stopped state
*/
function pause() public onlyPauser whenNotPaused {
_paused = true;
emit Paused(msg.sender);
}
/**
* @dev called by the owner to unpause, returns to normal state
*/
function unpause() public onlyPauser whenPaused {
_paused = false;
emit Unpaused(msg.sender);
}
}
// File: contracts/identity/IdentityAdminRole.sol
/**
* @title Contract managing the identity admin role
*/
contract IdentityAdminRole is Ownable {
using Roles for Roles.Role;
event IdentityAdminAdded(address indexed account);
event IdentityAdminRemoved(address indexed account);
Roles.Role private IdentityAdmins;
/* @dev constructor. Adds caller as an admin
*/
constructor() internal {
_addIdentityAdmin(msg.sender);
}
/* @dev Modifier to check if caller is an admin
*/
modifier onlyIdentityAdmin() {
require(isIdentityAdmin(msg.sender), "not IdentityAdmin");
_;
}
/**
* @dev Checks if account is identity admin
* @param account Account to check
* @return Boolean indicating if account is identity admin
*/
function isIdentityAdmin(address account) public view returns (bool) {
return IdentityAdmins.has(account);
}
/**
* @dev Adds a identity admin account. Is only callable by owner.
* @param account Address to be added
* @return true if successful
*/
function addIdentityAdmin(address account) public onlyOwner returns (bool) {
_addIdentityAdmin(account);
return true;
}
/**
* @dev Removes a identity admin account. Is only callable by owner.
* @param account Address to be removed
* @return true if successful
*/
function removeIdentityAdmin(address account) public onlyOwner returns (bool) {
_removeIdentityAdmin(account);
return true;
}
/**
* @dev Allows an admin to renounce their role
*/
function renounceIdentityAdmin() public {
_removeIdentityAdmin(msg.sender);
}
/**
* @dev Internal implementation of addIdentityAdmin
*/
function _addIdentityAdmin(address account) internal {
IdentityAdmins.add(account);
emit IdentityAdminAdded(account);
}
/**
* @dev Internal implementation of removeIdentityAdmin
*/
function _removeIdentityAdmin(address account) internal {
IdentityAdmins.remove(account);
emit IdentityAdminRemoved(account);
}
}
// File: contracts/identity/Identity.sol
/* @title Identity contract responsible for whitelisting
* and keeping track of amount of whitelisted users
*/
contract Identity is IdentityAdminRole, SchemeGuard, Pausable {
using Roles for Roles.Role;
using SafeMath for uint256;
Roles.Role private blacklist;
Roles.Role private whitelist;
Roles.Role private contracts;
uint256 public whitelistedCount = 0;
uint256 public whitelistedContracts = 0;
uint256 public authenticationPeriod = 14;
mapping(address => uint256) public dateAuthenticated;
mapping(address => uint256) public dateAdded;
mapping(address => string) public addrToDID;
mapping(bytes32 => address) public didHashToAddress;
event BlacklistAdded(address indexed account);
event BlacklistRemoved(address indexed account);
event WhitelistedAdded(address indexed account);
event WhitelistedRemoved(address indexed account);
event ContractAdded(address indexed account);
event ContractRemoved(address indexed account);
constructor() public SchemeGuard(Avatar(0)) {}
/* @dev Sets a new value for authenticationPeriod.
* Can only be called by Identity Administrators.
* @param period new value for authenticationPeriod
*/
function setAuthenticationPeriod(uint256 period) public onlyOwner whenNotPaused {
authenticationPeriod = period;
}
/* @dev Sets the authentication date of `account`
* to the current time.
* Can only be called by Identity Administrators.
* @param account address to change its auth date
*/
function authenticate(address account)
public
onlyRegistered
onlyIdentityAdmin
whenNotPaused
{
dateAuthenticated[account] = now;
}
/* @dev Adds an address as whitelisted.
* Can only be called by Identity Administrators.
* @param account address to add as whitelisted
*/
function addWhitelisted(address account)
public
onlyRegistered
onlyIdentityAdmin
whenNotPaused
{
_addWhitelisted(account);
}
/* @dev Adds an address as whitelisted under a specific ID
* @param account The address to add
* @param did the ID to add account under
*/
function addWhitelistedWithDID(address account, string memory did)
public
onlyRegistered
onlyIdentityAdmin
whenNotPaused
{
_addWhitelistedWithDID(account, did);
}
/* @dev Removes an address as whitelisted.
* Can only be called by Identity Administrators.
* @param account address to remove as whitelisted
*/
function removeWhitelisted(address account)
public
onlyRegistered
onlyIdentityAdmin
whenNotPaused
{
_removeWhitelisted(account);
}
/* @dev Renounces message sender from whitelisted
*/
function renounceWhitelisted() public whenNotPaused {
_removeWhitelisted(msg.sender);
}
/* @dev Returns true if given address has been added to whitelist
* @param account the address to check
* @return a bool indicating weather the address is present in whitelist
*/
function isWhitelisted(address account) public view returns (bool) {
uint256 daysSinceAuthentication = (now.sub(dateAuthenticated[account])) / 1 days;
return
(daysSinceAuthentication <= authenticationPeriod) && whitelist.has(account);
}
/* @dev Function that gives the date the given user was added
* @param account The address to check
* @return The date the address was added
*/
function lastAuthenticated(address account) public view returns (uint256) {
return dateAuthenticated[account];
}
// /**
// *
// * @dev Function to transfer whitelisted privilege to another address
// * relocates did of sender to give address
// * @param account The address to transfer to
// */
// function transferAccount(address account) public whenNotPaused {
// ERC20 token = avatar.nativeToken();
// require(!isBlacklisted(account), "Cannot transfer to blacklisted");
// require(token.balanceOf(account) == 0, "Account is already in use");
// require(isWhitelisted(msg.sender), "Requester need to be whitelisted");
// require(
// keccak256(bytes(addrToDID[account])) == keccak256(bytes("")),
// "address already has DID"
// );
// string memory did = addrToDID[msg.sender];
// bytes32 pHash = keccak256(bytes(did));
// uint256 balance = token.balanceOf(msg.sender);
// token.transferFrom(msg.sender, account, balance);
// _removeWhitelisted(msg.sender);
// _addWhitelisted(account);
// addrToDID[account] = did;
// didHashToAddress[pHash] = account;
// }
/* @dev Adds an address to blacklist.
* Can only be called by Identity Administrators.
* @param account address to add as blacklisted
*/
function addBlacklisted(address account)
public
onlyRegistered
onlyIdentityAdmin
whenNotPaused
{
blacklist.add(account);
emit BlacklistAdded(account);
}
/* @dev Removes an address from blacklist
* Can only be called by Identity Administrators.
* @param account address to remove as blacklisted
*/
function removeBlacklisted(address account)
public
onlyRegistered
onlyIdentityAdmin
whenNotPaused
{
blacklist.remove(account);
emit BlacklistRemoved(account);
}
/* @dev Function to add a Contract to list of contracts
* @param account The address to add
*/
function addContract(address account)
public
onlyRegistered
onlyIdentityAdmin
whenNotPaused
{
require(isContract(account), "Given address is not a contract");
contracts.add(account);
_addWhitelisted(account);
emit ContractAdded(account);
}
/* @dev Function to remove a Contract from list of contracts
* @param account The address to add
*/
function removeContract(address account)
public
onlyRegistered
onlyIdentityAdmin
whenNotPaused
{
contracts.remove(account);
_removeWhitelisted(account);
emit ContractRemoved(account);
}
/* @dev Function to check if given contract is on list of contracts.
* @param address to check
* @return a bool indicating if address is on list of contracts
*/
function isDAOContract(address account) public view returns (bool) {
return contracts.has(account);
}
/* @dev Internal function to add to whitelisted
* @param account the address to add
*/
function _addWhitelisted(address account) internal {
whitelist.add(account);
whitelistedCount += 1;
dateAdded[account] = now;
dateAuthenticated[account] = now;
if (isContract(account)) {
whitelistedContracts += 1;
}
emit WhitelistedAdded(account);
}
/* @dev Internal whitelisting with did function.
* @param account the address to add
* @param did the id to register account under
*/
function _addWhitelistedWithDID(address account, string memory did) internal {
bytes32 pHash = keccak256(bytes(did));
require(didHashToAddress[pHash] == address(0), "DID already registered");
addrToDID[account] = did;
didHashToAddress[pHash] = account;
_addWhitelisted(account);
}
/* @dev Internal function to remove from whitelisted
* @param account the address to add
*/
function _removeWhitelisted(address account) internal {
whitelist.remove(account);
whitelistedCount -= 1;
delete dateAuthenticated[account];
if (isContract(account)) {
whitelistedContracts -= 1;
}
string memory did = addrToDID[account];
bytes32 pHash = keccak256(bytes(did));
delete dateAuthenticated[account];
delete addrToDID[account];
delete didHashToAddress[pHash];
emit WhitelistedRemoved(account);
}
/* @dev Returns true if given address has been added to the blacklist
* @param account the address to check
* @return a bool indicating weather the address is present in the blacklist
*/
function isBlacklisted(address account) public view returns (bool) {
return blacklist.has(account);
}
/* @dev Function to see if given address is a contract
* @return true if address is a contract
*/
function isContract(address _addr) internal view returns (bool) {
uint256 length;
assembly {
length := extcodesize(_addr)
}
return length > 0;
}
}
// File: contracts/identity/IdentityGuard.sol
/* @title The IdentityGuard contract
* @dev Contract containing an identity and
* modifiers to ensure proper access
*/
contract IdentityGuard is Ownable {
Identity public identity;
/* @dev Constructor. Checks if identity is a zero address
* @param _identity The identity contract.
*/
constructor(Identity _identity) public {
require(_identity != Identity(0), "Supplied identity is null");
identity = _identity;
}
/* @dev Modifier that requires the sender to be not blacklisted
*/
modifier onlyNotBlacklisted() {
require(!identity.isBlacklisted(msg.sender), "Caller is blacklisted");
_;
}
/* @dev Modifier that requires the given address to be not blacklisted
* @param _account The address to be checked
*/
modifier requireNotBlacklisted(address _account) {
require(!identity.isBlacklisted(_account), "Receiver is blacklisted");
_;
}
/* @dev Modifier that requires the sender to be whitelisted
*/
modifier onlyWhitelisted() {
require(identity.isWhitelisted(msg.sender), "is not whitelisted");
_;
}
/* @dev Modifier that requires the given address to be whitelisted
* @param _account the given address
*/
modifier requireWhitelisted(address _account) {
require(identity.isWhitelisted(_account), "is not whitelisted");
_;
}
/* @dev Modifier that requires the sender to be an approved DAO contract
*/
modifier onlyDAOContract() {
require(identity.isDAOContract(msg.sender), "is not whitelisted contract");
_;
}
/* @dev Modifier that requires the given address to be whitelisted
* @param _account the given address
*/
modifier requireDAOContract(address _contract) {
require(identity.isDAOContract(_contract), "is not whitelisted contract");
_;
}
/* @dev Modifier that requires the sender to have been whitelisted
* before or on the given date
* @param date The time sender must have been added before
*/
modifier onlyAddedBefore(uint256 date) {
require(
identity.lastAuthenticated(msg.sender) <= date,
"Was not added within period"
);
_;
}
/* @dev Modifier that requires sender to be an identity admin
*/
modifier onlyIdentityAdmin() {
require(identity.isIdentityAdmin(msg.sender), "not IdentityAdmin");
_;
}
/* @dev Allows owner to set a new identity contract if
* the given identity contract has been registered as a scheme
*/
function setIdentity(Identity _identity) public onlyOwner {
require(_identity.isRegistered(), "Identity is not registered");
identity = _identity;
}
}
// File: contracts/dao/schemes/FeelessScheme.sol
/**
* @dev Contract for letting scheme add itself to identity
* to allow transferring GoodDollar without paying fees
* and transfer ownership to Avatar
*/
contract FeelessScheme is SchemeGuard, IdentityGuard {
/* @dev Constructor
* @param _identity The identity contract
* @param _avatar The avatar of the DAO
*/
constructor(Identity _identity, Avatar _avatar)
public
SchemeGuard(_avatar)
IdentityGuard(_identity)
{}
/* @dev Internal function to add contract to identity.
* Can only be called if scheme is registered.
*/
function addRights() internal onlyRegistered {
controller.genericCall(
address(identity),
abi.encodeWithSignature("addContract(address)", address(this)),
avatar,
0
);
transferOwnership(address(avatar));
}
/* @dev Internal function to remove contract from identity.
* Can only be called if scheme is registered.
*/
function removeRights() internal onlyRegistered {
controller.genericCall(
address(identity),
abi.encodeWithSignature("removeContract(address)", address(this)),
avatar,
0
);
}
}
// File: contracts/dao/schemes/OneTimePayments.sol
/* @title One Time payment scheme
* Scheme that allows address to deposit tokens for any address to withdraw
*/
contract OneTimePayments is FeelessScheme {
using SafeMath for uint256;
struct Payment {
bool hasPayment;
uint256 paymentAmount;
address paymentSender;
}
mapping(address => Payment) public payments;
event PaymentDeposit(address indexed from, address paymentId, uint256 amount);
event PaymentCancel(address indexed from, address paymentId, uint256 amount);
event PaymentWithdraw(
address indexed from,
address indexed to,
address indexed paymentId,
uint256 amount
);
/* @dev Constructor
* @param _avatar The avatar of the DAO
* @param _identity The identity contract
* @param _gasLimit The gas limit
*/
constructor(Avatar _avatar, Identity _identity)
public
FeelessScheme(_identity, _avatar)
{}
/* @dev Start function. Adds this contract to identity as a feeless scheme.
* Can only be called if scheme is registered
*/
function start() public onlyRegistered {
addRights();
}
/* @dev ERC677 on token transfer function. When transferAndCall is called on this contract,
* this function is called, depositing the payment amount under the hash of the given bytes.
* Reverts if hash is already in use. Can only be called by token contract.
* @param sender the address of the sender
* @param value the amount to deposit
* @param data The given paymentId which should be a fresh address of a wallet
*/
function onTokenTransfer(
address sender,
uint256 value,
bytes calldata data
) external onlyRegistered returns (bool) {
address paymentId = abi.decode(data, (address));
require(!payments[paymentId].hasPayment, "paymentId already in use");
require(msg.sender == address(avatar.nativeToken()), "Only callable by this");
payments[paymentId] = Payment(true, value, sender);
emit PaymentDeposit(sender, paymentId, value);
return true;
}
/* @dev Withdrawal function.
* allows the sender that proves ownership of paymentId to withdraw
* @param paymentId the address of the public key that the
* rightful receiver of the payment knows the private key to
* @param signature the signature of a the message containing the msg.sender address signed
* with the private key.
*/
function withdraw(address paymentId, bytes memory signature) public onlyRegistered {
address signer = signerOfAddress(msg.sender, signature);
require(signer == paymentId, "Signature is not correct");
uint256 value = payments[paymentId].paymentAmount;
address sender = payments[paymentId].paymentSender;
_withdraw(paymentId, value);
emit PaymentWithdraw(sender, msg.sender, paymentId, value);
}
/* @dev Cancel function
* allows only creator of payment to cancel
* @param paymentId The paymentId of the payment to cancelæ
*/
function cancel(address paymentId) public {
require(
payments[paymentId].paymentSender == msg.sender,
"Can only be called by creator"
);
uint256 value = payments[paymentId].paymentAmount;
_withdraw(paymentId, value);
emit PaymentCancel(msg.sender, paymentId, value);
}
/* @dev Internal withdraw function
* @param paymentId the paymentId of the payment
* @param value the amopunt in the payment
*/
function _withdraw(address paymentId, uint256 value) internal {
require(payments[paymentId].hasPayment, "paymentId not in use");
payments[paymentId].hasPayment = false;
require(
avatar.nativeToken().transfer(msg.sender, value),
"withdraw transfer failed"
);
}
/* @dev function to check if a payment hash is in use
* @param paymentId the given paymentId
*/
function hasPayment(address paymentId) public view returns (bool) {
return payments[paymentId].hasPayment;
}
/* @dev gives the signer address of the signature and the message
* @param message the plain-text message that is signed by the signature
* @param signature the signature of the plain-text message
*/
function signerOfAddress(address message, bytes memory signature)
internal
pure
returns (address)
{
bytes32 signedMessage = ECDSA.toEthSignedMessageHash(
keccak256(abi.encodePacked(message))
);
address signer = ECDSA.recover(signedMessage, signature);
return signer;
}
}

Contract ABI

[{"type":"constructor","stateMutability":"nonpayable","payable":false,"inputs":[{"type":"address","name":"_avatar","internalType":"contract Avatar"},{"type":"address","name":"_identity","internalType":"contract Identity"}]},{"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":"PaymentCancel","inputs":[{"type":"address","name":"from","internalType":"address","indexed":true},{"type":"address","name":"paymentId","internalType":"address","indexed":false},{"type":"uint256","name":"amount","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"PaymentDeposit","inputs":[{"type":"address","name":"from","internalType":"address","indexed":true},{"type":"address","name":"paymentId","internalType":"address","indexed":false},{"type":"uint256","name":"amount","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"PaymentWithdraw","inputs":[{"type":"address","name":"from","internalType":"address","indexed":true},{"type":"address","name":"to","internalType":"address","indexed":true},{"type":"address","name":"paymentId","internalType":"address","indexed":true},{"type":"uint256","name":"amount","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"cancel","inputs":[{"type":"address","name":"paymentId","internalType":"address"}],"constant":false},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"hasPayment","inputs":[{"type":"address","name":"paymentId","internalType":"address"}],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"address","name":"","internalType":"contract Identity"}],"name":"identity","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"isOwner","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"isRegistered","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"isRegistered","inputs":[{"type":"address","name":"scheme","internalType":"address"}],"constant":true},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"onTokenTransfer","inputs":[{"type":"address","name":"sender","internalType":"address"},{"type":"uint256","name":"value","internalType":"uint256"},{"type":"bytes","name":"data","internalType":"bytes"}],"constant":false},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"address","name":"","internalType":"address"}],"name":"owner","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"bool","name":"hasPayment","internalType":"bool"},{"type":"uint256","name":"paymentAmount","internalType":"uint256"},{"type":"address","name":"paymentSender","internalType":"address"}],"name":"payments","inputs":[{"type":"address","name":"","internalType":"address"}],"constant":true},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"renounceOwnership","inputs":[],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"setAvatar","inputs":[{"type":"address","name":"_avatar","internalType":"contract Avatar"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"setIdentity","inputs":[{"type":"address","name":"_identity","internalType":"contract Identity"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"start","inputs":[],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"transferOwnership","inputs":[{"type":"address","name":"newOwner","internalType":"address"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"withdraw","inputs":[{"type":"address","name":"paymentId","internalType":"address"},{"type":"bytes","name":"signature","internalType":"bytes"}],"constant":false}]
            

Contract Byte Code

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