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| 11685215 | 1387 days ago | 0 ETH | |||||
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Similar Match Source Code This contract matches the deployed Bytecode of the Source Code for Contract 0xAe38b814...603D84480 The constructor portion of the code might be different and could alter the actual behaviour of the contract
Contract Name:
Synth
Compiler Version
v0.4.25+commit.59dbf8f1
Optimization Enabled:
Yes with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity)
/**
*Submitted for verification at Etherscan.io on 2020-03-31
*/
/*
⚠⚠⚠ WARNING WARNING WARNING ⚠⚠⚠
This is a TARGET contract - DO NOT CONNECT TO IT DIRECTLY IN YOUR CONTRACTS or DAPPS!
This contract has an associated PROXY that MUST be used for all integrations - this TARGET will be REPLACED in an upcoming Synthetix release!
The proxy can be found by looking up the PROXY property on this contract.
*//*
____ __ __ __ _
/ __/__ __ ___ / /_ / / ___ / /_ (_)__ __
_\ \ / // // _ \/ __// _ \/ -_)/ __// / \ \ /
/___/ \_, //_//_/\__//_//_/\__/ \__//_/ /_\_\
/___/
* Synthetix: Synth.sol
*
* Latest source (may be newer): https://github.com/Synthetixio/synthetix/blob/master/contracts/Synth.sol
* Docs: https://docs.synthetix.io/contracts/Synth
*
* Contract Dependencies:
* - ExternStateToken
* - MixinResolver
* - Owned
* - Proxyable
* - SelfDestructible
* - State
* Libraries:
* - SafeDecimalMath
* - SafeMath
*
* MIT License
* ===========
*
* Copyright (c) 2020 Synthetix
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
*/
/* ===============================================
* Flattened with Solidifier by Coinage
*
* https://solidifier.coina.ge
* ===============================================
*/
pragma solidity ^0.4.24;
/**
* @title SafeMath
* @dev Math operations with safety checks that revert on error
*/
library SafeMath {
/**
* @dev Multiplies two numbers, 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 numbers truncating the quotient, reverts on division by zero.
*/
function div(uint256 a, uint256 b) internal pure returns (uint256) {
require(b > 0); // Solidity only automatically asserts when dividing by 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 numbers, 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 numbers, 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 numbers 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;
}
}
// https://docs.synthetix.io/contracts/SafeDecimalMath
library SafeDecimalMath {
using SafeMath for uint;
/* Number of decimal places in the representations. */
uint8 public constant decimals = 18;
uint8 public constant highPrecisionDecimals = 27;
/* The number representing 1.0. */
uint public constant UNIT = 10**uint(decimals);
/* The number representing 1.0 for higher fidelity numbers. */
uint public constant PRECISE_UNIT = 10**uint(highPrecisionDecimals);
uint private constant UNIT_TO_HIGH_PRECISION_CONVERSION_FACTOR = 10**uint(highPrecisionDecimals - decimals);
/**
* @return Provides an interface to UNIT.
*/
function unit() external pure returns (uint) {
return UNIT;
}
/**
* @return Provides an interface to PRECISE_UNIT.
*/
function preciseUnit() external pure returns (uint) {
return PRECISE_UNIT;
}
/**
* @return The result of multiplying x and y, interpreting the operands as fixed-point
* decimals.
*
* @dev A unit factor is divided out after the product of x and y is evaluated,
* so that product must be less than 2**256. As this is an integer division,
* the internal division always rounds down. This helps save on gas. Rounding
* is more expensive on gas.
*/
function multiplyDecimal(uint x, uint y) internal pure returns (uint) {
/* Divide by UNIT to remove the extra factor introduced by the product. */
return x.mul(y) / UNIT;
}
/**
* @return The result of safely multiplying x and y, interpreting the operands
* as fixed-point decimals of the specified precision unit.
*
* @dev The operands should be in the form of a the specified unit factor which will be
* divided out after the product of x and y is evaluated, so that product must be
* less than 2**256.
*
* Unlike multiplyDecimal, this function rounds the result to the nearest increment.
* Rounding is useful when you need to retain fidelity for small decimal numbers
* (eg. small fractions or percentages).
*/
function _multiplyDecimalRound(uint x, uint y, uint precisionUnit) private pure returns (uint) {
/* Divide by UNIT to remove the extra factor introduced by the product. */
uint quotientTimesTen = x.mul(y) / (precisionUnit / 10);
if (quotientTimesTen % 10 >= 5) {
quotientTimesTen += 10;
}
return quotientTimesTen / 10;
}
/**
* @return The result of safely multiplying x and y, interpreting the operands
* as fixed-point decimals of a precise unit.
*
* @dev The operands should be in the precise unit factor which will be
* divided out after the product of x and y is evaluated, so that product must be
* less than 2**256.
*
* Unlike multiplyDecimal, this function rounds the result to the nearest increment.
* Rounding is useful when you need to retain fidelity for small decimal numbers
* (eg. small fractions or percentages).
*/
function multiplyDecimalRoundPrecise(uint x, uint y) internal pure returns (uint) {
return _multiplyDecimalRound(x, y, PRECISE_UNIT);
}
/**
* @return The result of safely multiplying x and y, interpreting the operands
* as fixed-point decimals of a standard unit.
*
* @dev The operands should be in the standard unit factor which will be
* divided out after the product of x and y is evaluated, so that product must be
* less than 2**256.
*
* Unlike multiplyDecimal, this function rounds the result to the nearest increment.
* Rounding is useful when you need to retain fidelity for small decimal numbers
* (eg. small fractions or percentages).
*/
function multiplyDecimalRound(uint x, uint y) internal pure returns (uint) {
return _multiplyDecimalRound(x, y, UNIT);
}
/**
* @return The result of safely dividing x and y. The return value is a high
* precision decimal.
*
* @dev y is divided after the product of x and the standard precision unit
* is evaluated, so the product of x and UNIT must be less than 2**256. As
* this is an integer division, the result is always rounded down.
* This helps save on gas. Rounding is more expensive on gas.
*/
function divideDecimal(uint x, uint y) internal pure returns (uint) {
/* Reintroduce the UNIT factor that will be divided out by y. */
return x.mul(UNIT).div(y);
}
/**
* @return The result of safely dividing x and y. The return value is as a rounded
* decimal in the precision unit specified in the parameter.
*
* @dev y is divided after the product of x and the specified precision unit
* is evaluated, so the product of x and the specified precision unit must
* be less than 2**256. The result is rounded to the nearest increment.
*/
function _divideDecimalRound(uint x, uint y, uint precisionUnit) private pure returns (uint) {
uint resultTimesTen = x.mul(precisionUnit * 10).div(y);
if (resultTimesTen % 10 >= 5) {
resultTimesTen += 10;
}
return resultTimesTen / 10;
}
/**
* @return The result of safely dividing x and y. The return value is as a rounded
* standard precision decimal.
*
* @dev y is divided after the product of x and the standard precision unit
* is evaluated, so the product of x and the standard precision unit must
* be less than 2**256. The result is rounded to the nearest increment.
*/
function divideDecimalRound(uint x, uint y) internal pure returns (uint) {
return _divideDecimalRound(x, y, UNIT);
}
/**
* @return The result of safely dividing x and y. The return value is as a rounded
* high precision decimal.
*
* @dev y is divided after the product of x and the high precision unit
* is evaluated, so the product of x and the high precision unit must
* be less than 2**256. The result is rounded to the nearest increment.
*/
function divideDecimalRoundPrecise(uint x, uint y) internal pure returns (uint) {
return _divideDecimalRound(x, y, PRECISE_UNIT);
}
/**
* @dev Convert a standard decimal representation to a high precision one.
*/
function decimalToPreciseDecimal(uint i) internal pure returns (uint) {
return i.mul(UNIT_TO_HIGH_PRECISION_CONVERSION_FACTOR);
}
/**
* @dev Convert a high precision decimal to a standard decimal representation.
*/
function preciseDecimalToDecimal(uint i) internal pure returns (uint) {
uint quotientTimesTen = i / (UNIT_TO_HIGH_PRECISION_CONVERSION_FACTOR / 10);
if (quotientTimesTen % 10 >= 5) {
quotientTimesTen += 10;
}
return quotientTimesTen / 10;
}
}
// https://docs.synthetix.io/contracts/Owned
contract Owned {
address public owner;
address public nominatedOwner;
/**
* @dev Owned Constructor
*/
constructor(address _owner) public {
require(_owner != address(0), "Owner address cannot be 0");
owner = _owner;
emit OwnerChanged(address(0), _owner);
}
/**
* @notice Nominate a new owner of this contract.
* @dev Only the current owner may nominate a new owner.
*/
function nominateNewOwner(address _owner) external onlyOwner {
nominatedOwner = _owner;
emit OwnerNominated(_owner);
}
/**
* @notice Accept the nomination to be owner.
*/
function acceptOwnership() external {
require(msg.sender == nominatedOwner, "You must be nominated before you can accept ownership");
emit OwnerChanged(owner, nominatedOwner);
owner = nominatedOwner;
nominatedOwner = address(0);
}
modifier onlyOwner {
require(msg.sender == owner, "Only the contract owner may perform this action");
_;
}
event OwnerNominated(address newOwner);
event OwnerChanged(address oldOwner, address newOwner);
}
// https://docs.synthetix.io/contracts/SelfDestructible
contract SelfDestructible is Owned {
uint public initiationTime;
bool public selfDestructInitiated;
address public selfDestructBeneficiary;
uint public constant SELFDESTRUCT_DELAY = 4 weeks;
/**
* @dev Constructor
* @param _owner The account which controls this contract.
*/
constructor(address _owner) public Owned(_owner) {
require(_owner != address(0), "Owner must not be zero");
selfDestructBeneficiary = _owner;
emit SelfDestructBeneficiaryUpdated(_owner);
}
/**
* @notice Set the beneficiary address of this contract.
* @dev Only the contract owner may call this. The provided beneficiary must be non-null.
* @param _beneficiary The address to pay any eth contained in this contract to upon self-destruction.
*/
function setSelfDestructBeneficiary(address _beneficiary) external onlyOwner {
require(_beneficiary != address(0), "Beneficiary must not be zero");
selfDestructBeneficiary = _beneficiary;
emit SelfDestructBeneficiaryUpdated(_beneficiary);
}
/**
* @notice Begin the self-destruction counter of this contract.
* Once the delay has elapsed, the contract may be self-destructed.
* @dev Only the contract owner may call this.
*/
function initiateSelfDestruct() external onlyOwner {
initiationTime = now;
selfDestructInitiated = true;
emit SelfDestructInitiated(SELFDESTRUCT_DELAY);
}
/**
* @notice Terminate and reset the self-destruction timer.
* @dev Only the contract owner may call this.
*/
function terminateSelfDestruct() external onlyOwner {
initiationTime = 0;
selfDestructInitiated = false;
emit SelfDestructTerminated();
}
/**
* @notice If the self-destruction delay has elapsed, destroy this contract and
* remit any ether it owns to the beneficiary address.
* @dev Only the contract owner may call this.
*/
function selfDestruct() external onlyOwner {
require(selfDestructInitiated, "Self Destruct not yet initiated");
require(initiationTime + SELFDESTRUCT_DELAY < now, "Self destruct delay not met");
address beneficiary = selfDestructBeneficiary;
emit SelfDestructed(beneficiary);
selfdestruct(beneficiary);
}
event SelfDestructTerminated();
event SelfDestructed(address beneficiary);
event SelfDestructInitiated(uint selfDestructDelay);
event SelfDestructBeneficiaryUpdated(address newBeneficiary);
}
// https://docs.synthetix.io/contracts/State
contract State is Owned {
// the address of the contract that can modify variables
// this can only be changed by the owner of this contract
address public associatedContract;
constructor(address _owner, address _associatedContract) public Owned(_owner) {
associatedContract = _associatedContract;
emit AssociatedContractUpdated(_associatedContract);
}
/* ========== SETTERS ========== */
// Change the associated contract to a new address
function setAssociatedContract(address _associatedContract) external onlyOwner {
associatedContract = _associatedContract;
emit AssociatedContractUpdated(_associatedContract);
}
/* ========== MODIFIERS ========== */
modifier onlyAssociatedContract {
require(msg.sender == associatedContract, "Only the associated contract can perform this action");
_;
}
/* ========== EVENTS ========== */
event AssociatedContractUpdated(address associatedContract);
}
// https://docs.synthetix.io/contracts/TokenState
contract TokenState is State {
/* ERC20 fields. */
mapping(address => uint) public balanceOf;
mapping(address => mapping(address => uint)) public allowance;
/**
* @dev Constructor
* @param _owner The address which controls this contract.
* @param _associatedContract The ERC20 contract whose state this composes.
*/
constructor(address _owner, address _associatedContract) public State(_owner, _associatedContract) {}
/* ========== SETTERS ========== */
/**
* @notice Set ERC20 allowance.
* @dev Only the associated contract may call this.
* @param tokenOwner The authorising party.
* @param spender The authorised party.
* @param value The total value the authorised party may spend on the
* authorising party's behalf.
*/
function setAllowance(address tokenOwner, address spender, uint value) external onlyAssociatedContract {
allowance[tokenOwner][spender] = value;
}
/**
* @notice Set the balance in a given account
* @dev Only the associated contract may call this.
* @param account The account whose value to set.
* @param value The new balance of the given account.
*/
function setBalanceOf(address account, uint value) external onlyAssociatedContract {
balanceOf[account] = value;
}
}
// https://docs.synthetix.io/contracts/Proxy
contract Proxy is Owned {
Proxyable public target;
bool public useDELEGATECALL;
constructor(address _owner) public Owned(_owner) {}
function setTarget(Proxyable _target) external onlyOwner {
target = _target;
emit TargetUpdated(_target);
}
function setUseDELEGATECALL(bool value) external onlyOwner {
useDELEGATECALL = value;
}
function _emit(bytes callData, uint numTopics, bytes32 topic1, bytes32 topic2, bytes32 topic3, bytes32 topic4)
external
onlyTarget
{
uint size = callData.length;
bytes memory _callData = callData;
assembly {
/* The first 32 bytes of callData contain its length (as specified by the abi).
* Length is assumed to be a uint256 and therefore maximum of 32 bytes
* in length. It is also leftpadded to be a multiple of 32 bytes.
* This means moving call_data across 32 bytes guarantees we correctly access
* the data itself. */
switch numTopics
case 0 {
log0(add(_callData, 32), size)
}
case 1 {
log1(add(_callData, 32), size, topic1)
}
case 2 {
log2(add(_callData, 32), size, topic1, topic2)
}
case 3 {
log3(add(_callData, 32), size, topic1, topic2, topic3)
}
case 4 {
log4(add(_callData, 32), size, topic1, topic2, topic3, topic4)
}
}
}
function() external payable {
if (useDELEGATECALL) {
assembly {
/* Copy call data into free memory region. */
let free_ptr := mload(0x40)
calldatacopy(free_ptr, 0, calldatasize)
/* Forward all gas and call data to the target contract. */
let result := delegatecall(gas, sload(target_slot), free_ptr, calldatasize, 0, 0)
returndatacopy(free_ptr, 0, returndatasize)
/* Revert if the call failed, otherwise return the result. */
if iszero(result) {
revert(free_ptr, returndatasize)
}
return(free_ptr, returndatasize)
}
} else {
/* Here we are as above, but must send the messageSender explicitly
* since we are using CALL rather than DELEGATECALL. */
target.setMessageSender(msg.sender);
assembly {
let free_ptr := mload(0x40)
calldatacopy(free_ptr, 0, calldatasize)
/* We must explicitly forward ether to the underlying contract as well. */
let result := call(gas, sload(target_slot), callvalue, free_ptr, calldatasize, 0, 0)
returndatacopy(free_ptr, 0, returndatasize)
if iszero(result) {
revert(free_ptr, returndatasize)
}
return(free_ptr, returndatasize)
}
}
}
modifier onlyTarget {
require(Proxyable(msg.sender) == target, "Must be proxy target");
_;
}
event TargetUpdated(Proxyable newTarget);
}
// https://docs.synthetix.io/contracts/Proxyable
contract Proxyable is Owned {
// This contract should be treated like an abstract contract
/* The proxy this contract exists behind. */
Proxy public proxy;
Proxy public integrationProxy;
/* The caller of the proxy, passed through to this contract.
* Note that every function using this member must apply the onlyProxy or
* optionalProxy modifiers, otherwise their invocations can use stale values. */
address public messageSender;
constructor(address _proxy, address _owner) public Owned(_owner) {
proxy = Proxy(_proxy);
emit ProxyUpdated(_proxy);
}
function setProxy(address _proxy) external onlyOwner {
proxy = Proxy(_proxy);
emit ProxyUpdated(_proxy);
}
function setIntegrationProxy(address _integrationProxy) external onlyOwner {
integrationProxy = Proxy(_integrationProxy);
}
function setMessageSender(address sender) external onlyProxy {
messageSender = sender;
}
modifier onlyProxy {
require(Proxy(msg.sender) == proxy || Proxy(msg.sender) == integrationProxy, "Only the proxy can call");
_;
}
modifier optionalProxy {
if (Proxy(msg.sender) != proxy && Proxy(msg.sender) != integrationProxy && messageSender != msg.sender) {
messageSender = msg.sender;
}
_;
}
modifier optionalProxy_onlyOwner {
if (Proxy(msg.sender) != proxy && Proxy(msg.sender) != integrationProxy && messageSender != msg.sender) {
messageSender = msg.sender;
}
require(messageSender == owner, "Owner only function");
_;
}
event ProxyUpdated(address proxyAddress);
}
// https://docs.synthetix.io/contracts/ExternStateToken
contract ExternStateToken is SelfDestructible, Proxyable {
using SafeMath for uint;
using SafeDecimalMath for uint;
/* ========== STATE VARIABLES ========== */
/* Stores balances and allowances. */
TokenState public tokenState;
/* Other ERC20 fields. */
string public name;
string public symbol;
uint public totalSupply;
uint8 public decimals;
/**
* @dev Constructor.
* @param _proxy The proxy associated with this contract.
* @param _name Token's ERC20 name.
* @param _symbol Token's ERC20 symbol.
* @param _totalSupply The total supply of the token.
* @param _tokenState The TokenState contract address.
* @param _owner The owner of this contract.
*/
constructor(
address _proxy,
TokenState _tokenState,
string _name,
string _symbol,
uint _totalSupply,
uint8 _decimals,
address _owner
) public SelfDestructible(_owner) Proxyable(_proxy, _owner) {
tokenState = _tokenState;
name = _name;
symbol = _symbol;
totalSupply = _totalSupply;
decimals = _decimals;
}
/* ========== VIEWS ========== */
/**
* @notice Returns the ERC20 allowance of one party to spend on behalf of another.
* @param owner The party authorising spending of their funds.
* @param spender The party spending tokenOwner's funds.
*/
function allowance(address owner, address spender) public view returns (uint) {
return tokenState.allowance(owner, spender);
}
/**
* @notice Returns the ERC20 token balance of a given account.
*/
function balanceOf(address account) public view returns (uint) {
return tokenState.balanceOf(account);
}
/* ========== MUTATIVE FUNCTIONS ========== */
/**
* @notice Set the address of the TokenState contract.
* @dev This can be used to "pause" transfer functionality, by pointing the tokenState at 0x000..
* as balances would be unreachable.
*/
function setTokenState(TokenState _tokenState) external optionalProxy_onlyOwner {
tokenState = _tokenState;
emitTokenStateUpdated(_tokenState);
}
function _internalTransfer(address from, address to, uint value) internal returns (bool) {
/* Disallow transfers to irretrievable-addresses. */
require(to != address(0) && to != address(this) && to != address(proxy), "Cannot transfer to this address");
// Insufficient balance will be handled by the safe subtraction.
tokenState.setBalanceOf(from, tokenState.balanceOf(from).sub(value));
tokenState.setBalanceOf(to, tokenState.balanceOf(to).add(value));
// Emit a standard ERC20 transfer event
emitTransfer(from, to, value);
return true;
}
/**
* @dev Perform an ERC20 token transfer. Designed to be called by transfer functions possessing
* the onlyProxy or optionalProxy modifiers.
*/
function _transfer_byProxy(address from, address to, uint value) internal returns (bool) {
return _internalTransfer(from, to, value);
}
/**
* @dev Perform an ERC20 token transferFrom. Designed to be called by transferFrom functions
* possessing the optionalProxy or optionalProxy modifiers.
*/
function _transferFrom_byProxy(address sender, address from, address to, uint value) internal returns (bool) {
/* Insufficient allowance will be handled by the safe subtraction. */
tokenState.setAllowance(from, sender, tokenState.allowance(from, sender).sub(value));
return _internalTransfer(from, to, value);
}
/**
* @notice Approves spender to transfer on the message sender's behalf.
*/
function approve(address spender, uint value) public optionalProxy returns (bool) {
address sender = messageSender;
tokenState.setAllowance(sender, spender, value);
emitApproval(sender, spender, value);
return true;
}
/* ========== EVENTS ========== */
event Transfer(address indexed from, address indexed to, uint value);
bytes32 constant TRANSFER_SIG = keccak256("Transfer(address,address,uint256)");
function emitTransfer(address from, address to, uint value) internal {
proxy._emit(abi.encode(value), 3, TRANSFER_SIG, bytes32(from), bytes32(to), 0);
}
event Approval(address indexed owner, address indexed spender, uint value);
bytes32 constant APPROVAL_SIG = keccak256("Approval(address,address,uint256)");
function emitApproval(address owner, address spender, uint value) internal {
proxy._emit(abi.encode(value), 3, APPROVAL_SIG, bytes32(owner), bytes32(spender), 0);
}
event TokenStateUpdated(address newTokenState);
bytes32 constant TOKENSTATEUPDATED_SIG = keccak256("TokenStateUpdated(address)");
function emitTokenStateUpdated(address newTokenState) internal {
proxy._emit(abi.encode(newTokenState), 1, TOKENSTATEUPDATED_SIG, 0, 0, 0);
}
}
interface ISystemStatus {
function requireSystemActive() external view;
function requireIssuanceActive() external view;
function requireExchangeActive() external view;
function requireSynthActive(bytes32 currencyKey) external view;
function requireSynthsActive(bytes32 sourceCurrencyKey, bytes32 destinationCurrencyKey) external view;
}
/**
* @title FeePool Interface
* @notice Abstract contract to hold public getters
*/
contract IFeePool {
address public FEE_ADDRESS;
uint public exchangeFeeRate;
function amountReceivedFromExchange(uint value) external view returns (uint);
function amountReceivedFromTransfer(uint value) external view returns (uint);
function recordFeePaid(uint sUSDAmount) external;
function appendAccountIssuanceRecord(address account, uint lockedAmount, uint debtEntryIndex) external;
function setRewardsToDistribute(uint amount) external;
}
/**
* @title SynthetixState interface contract
* @notice Abstract contract to hold public getters
*/
contract ISynthetixState {
// A struct for handing values associated with an individual user's debt position
struct IssuanceData {
// Percentage of the total debt owned at the time
// of issuance. This number is modified by the global debt
// delta array. You can figure out a user's exit price and
// collateralisation ratio using a combination of their initial
// debt and the slice of global debt delta which applies to them.
uint initialDebtOwnership;
// This lets us know when (in relative terms) the user entered
// the debt pool so we can calculate their exit price and
// collateralistion ratio
uint debtEntryIndex;
}
uint[] public debtLedger;
uint public issuanceRatio;
mapping(address => IssuanceData) public issuanceData;
function debtLedgerLength() external view returns (uint);
function hasIssued(address account) external view returns (bool);
function incrementTotalIssuerCount() external;
function decrementTotalIssuerCount() external;
function setCurrentIssuanceData(address account, uint initialDebtOwnership) external;
function lastDebtLedgerEntry() external view returns (uint);
function appendDebtLedgerValue(uint value) external;
function clearIssuanceData(address account) external;
}
interface ISynth {
function burn(address account, uint amount) external;
function issue(address account, uint amount) external;
function transfer(address to, uint value) external returns (bool);
function transferFrom(address from, address to, uint value) external returns (bool);
function transferFromAndSettle(address from, address to, uint value) external returns (bool);
function balanceOf(address owner) external view returns (uint);
}
/**
* @title SynthetixEscrow interface
*/
interface ISynthetixEscrow {
function balanceOf(address account) public view returns (uint);
function appendVestingEntry(address account, uint quantity) public;
}
/**
* @title ExchangeRates interface
*/
interface IExchangeRates {
function effectiveValue(bytes32 sourceCurrencyKey, uint sourceAmount, bytes32 destinationCurrencyKey)
external
view
returns (uint);
function rateForCurrency(bytes32 currencyKey) external view returns (uint);
function ratesForCurrencies(bytes32[] currencyKeys) external view returns (uint[] memory);
function rateIsStale(bytes32 currencyKey) external view returns (bool);
function rateIsFrozen(bytes32 currencyKey) external view returns (bool);
function anyRateIsStale(bytes32[] currencyKeys) external view returns (bool);
function getCurrentRoundId(bytes32 currencyKey) external view returns (uint);
function effectiveValueAtRound(
bytes32 sourceCurrencyKey,
uint sourceAmount,
bytes32 destinationCurrencyKey,
uint roundIdForSrc,
uint roundIdForDest
) external view returns (uint);
function getLastRoundIdBeforeElapsedSecs(
bytes32 currencyKey,
uint startingRoundId,
uint startingTimestamp,
uint timediff
) external view returns (uint);
function ratesAndStaleForCurrencies(bytes32[] currencyKeys) external view returns (uint[], bool);
function rateAndTimestampAtRound(bytes32 currencyKey, uint roundId) external view returns (uint rate, uint time);
}
/**
* @title Synthetix interface contract
* @notice Abstract contract to hold public getters
* @dev pseudo interface, actually declared as contract to hold the public getters
*/
contract ISynthetix {
// ========== PUBLIC STATE VARIABLES ==========
uint public totalSupply;
mapping(bytes32 => Synth) public synths;
mapping(address => bytes32) public synthsByAddress;
// ========== PUBLIC FUNCTIONS ==========
function balanceOf(address account) public view returns (uint);
function transfer(address to, uint value) public returns (bool);
function transferFrom(address from, address to, uint value) public returns (bool);
function exchange(bytes32 sourceCurrencyKey, uint sourceAmount, bytes32 destinationCurrencyKey)
external
returns (uint amountReceived);
function issueSynths(uint amount) external;
function issueMaxSynths() external;
function burnSynths(uint amount) external;
function burnSynthsToTarget() external;
function settle(bytes32 currencyKey) external returns (uint reclaimed, uint refunded, uint numEntries);
function collateralisationRatio(address issuer) public view returns (uint);
function totalIssuedSynths(bytes32 currencyKey) public view returns (uint);
function totalIssuedSynthsExcludeEtherCollateral(bytes32 currencyKey) public view returns (uint);
function debtBalanceOf(address issuer, bytes32 currencyKey) public view returns (uint);
function debtBalanceOfAndTotalDebt(address issuer, bytes32 currencyKey)
public
view
returns (uint debtBalance, uint totalSystemValue);
function remainingIssuableSynths(address issuer)
public
view
returns (uint maxIssuable, uint alreadyIssued, uint totalSystemDebt);
function maxIssuableSynths(address issuer) public view returns (uint maxIssuable);
function isWaitingPeriod(bytes32 currencyKey) external view returns (bool);
function emitSynthExchange(
address account,
bytes32 fromCurrencyKey,
uint fromAmount,
bytes32 toCurrencyKey,
uint toAmount,
address toAddress
) external;
function emitExchangeReclaim(address account, bytes32 currencyKey, uint amount) external;
function emitExchangeRebate(address account, bytes32 currencyKey, uint amount) external;
}
interface IExchanger {
function maxSecsLeftInWaitingPeriod(address account, bytes32 currencyKey) external view returns (uint);
function feeRateForExchange(bytes32 sourceCurrencyKey, bytes32 destinationCurrencyKey) external view returns (uint);
function settlementOwing(address account, bytes32 currencyKey)
external
view
returns (uint reclaimAmount, uint rebateAmount, uint numEntries);
function settle(address from, bytes32 currencyKey) external returns (uint reclaimed, uint refunded, uint numEntries);
function exchange(
address from,
bytes32 sourceCurrencyKey,
uint sourceAmount,
bytes32 destinationCurrencyKey,
address destinationAddress
) external returns (uint amountReceived);
function exchangeOnBehalf(
address exchangeForAddress,
address from,
bytes32 sourceCurrencyKey,
uint sourceAmount,
bytes32 destinationCurrencyKey
) external returns (uint amountReceived);
function calculateAmountAfterSettlement(address from, bytes32 currencyKey, uint amount, uint refunded)
external
view
returns (uint amountAfterSettlement);
}
interface IIssuer {
function issueSynths(address from, uint amount) external;
function issueSynthsOnBehalf(address issueFor, address from, uint amount) external;
function issueMaxSynths(address from) external;
function issueMaxSynthsOnBehalf(address issueFor, address from) external;
function burnSynths(address from, uint amount) external;
function burnSynthsOnBehalf(address burnForAddress, address from, uint amount) external;
function burnSynthsToTarget(address from) external;
function burnSynthsToTargetOnBehalf(address burnForAddress, address from) external;
function canBurnSynths(address account) external view returns (bool);
function lastIssueEvent(address account) external view returns (uint);
}
// https://docs.synthetix.io/contracts/AddressResolver
contract AddressResolver is Owned {
mapping(bytes32 => address) public repository;
constructor(address _owner) public Owned(_owner) {}
/* ========== MUTATIVE FUNCTIONS ========== */
function importAddresses(bytes32[] names, address[] destinations) public onlyOwner {
require(names.length == destinations.length, "Input lengths must match");
for (uint i = 0; i < names.length; i++) {
repository[names[i]] = destinations[i];
}
}
/* ========== VIEWS ========== */
function getAddress(bytes32 name) public view returns (address) {
return repository[name];
}
function requireAndGetAddress(bytes32 name, string reason) public view returns (address) {
address _foundAddress = repository[name];
require(_foundAddress != address(0), reason);
return _foundAddress;
}
}
// https://docs.synthetix.io/contracts/MixinResolver
contract MixinResolver is Owned {
AddressResolver public resolver;
mapping(bytes32 => address) private addressCache;
bytes32[] public resolverAddressesRequired;
uint public constant MAX_ADDRESSES_FROM_RESOLVER = 24;
constructor(address _owner, address _resolver, bytes32[MAX_ADDRESSES_FROM_RESOLVER] _addressesToCache)
public
Owned(_owner)
{
for (uint i = 0; i < _addressesToCache.length; i++) {
if (_addressesToCache[i] != bytes32(0)) {
resolverAddressesRequired.push(_addressesToCache[i]);
} else {
// End early once an empty item is found - assumes there are no empty slots in
// _addressesToCache
break;
}
}
resolver = AddressResolver(_resolver);
// Do not sync the cache as addresses may not be in the resolver yet
}
/* ========== SETTERS ========== */
function setResolverAndSyncCache(AddressResolver _resolver) external onlyOwner {
resolver = _resolver;
for (uint i = 0; i < resolverAddressesRequired.length; i++) {
bytes32 name = resolverAddressesRequired[i];
// Note: can only be invoked once the resolver has all the targets needed added
addressCache[name] = resolver.requireAndGetAddress(name, "Resolver missing target");
}
}
/* ========== VIEWS ========== */
function requireAndGetAddress(bytes32 name, string reason) internal view returns (address) {
address _foundAddress = addressCache[name];
require(_foundAddress != address(0), reason);
return _foundAddress;
}
// Note: this could be made external in a utility contract if addressCache was made public
// (used for deployment)
function isResolverCached(AddressResolver _resolver) external view returns (bool) {
if (resolver != _resolver) {
return false;
}
// otherwise, check everything
for (uint i = 0; i < resolverAddressesRequired.length; i++) {
bytes32 name = resolverAddressesRequired[i];
// false if our cache is invalid or if the resolver doesn't have the required address
if (resolver.getAddress(name) != addressCache[name] || addressCache[name] == address(0)) {
return false;
}
}
return true;
}
// Note: can be made external into a utility contract (used for deployment)
function getResolverAddressesRequired() external view returns (bytes32[MAX_ADDRESSES_FROM_RESOLVER] addressesRequired) {
for (uint i = 0; i < resolverAddressesRequired.length; i++) {
addressesRequired[i] = resolverAddressesRequired[i];
}
}
/* ========== INTERNAL FUNCTIONS ========== */
function appendToAddressCache(bytes32 name) internal {
resolverAddressesRequired.push(name);
require(resolverAddressesRequired.length < MAX_ADDRESSES_FROM_RESOLVER, "Max resolver cache size met");
// Because this is designed to be called internally in constructors, we don't
// check the address exists already in the resolver
addressCache[name] = resolver.getAddress(name);
}
}
// https://docs.synthetix.io/contracts/Synth
contract Synth is ExternStateToken, MixinResolver {
/* ========== STATE VARIABLES ========== */
// Currency key which identifies this Synth to the Synthetix system
bytes32 public currencyKey;
uint8 public constant DECIMALS = 18;
// Where fees are pooled in sUSD
address public constant FEE_ADDRESS = 0xfeEFEEfeefEeFeefEEFEEfEeFeefEEFeeFEEFEeF;
/* ========== ADDRESS RESOLVER CONFIGURATION ========== */
bytes32 private constant CONTRACT_SYSTEMSTATUS = "SystemStatus";
bytes32 private constant CONTRACT_SYNTHETIX = "Synthetix";
bytes32 private constant CONTRACT_EXCHANGER = "Exchanger";
bytes32 private constant CONTRACT_ISSUER = "Issuer";
bytes32 private constant CONTRACT_FEEPOOL = "FeePool";
bytes32[24] internal addressesToCache = [
CONTRACT_SYSTEMSTATUS,
CONTRACT_SYNTHETIX,
CONTRACT_EXCHANGER,
CONTRACT_ISSUER,
CONTRACT_FEEPOOL
];
/* ========== CONSTRUCTOR ========== */
constructor(
address _proxy,
TokenState _tokenState,
string _tokenName,
string _tokenSymbol,
address _owner,
bytes32 _currencyKey,
uint _totalSupply,
address _resolver
)
public
ExternStateToken(_proxy, _tokenState, _tokenName, _tokenSymbol, _totalSupply, DECIMALS, _owner)
MixinResolver(_owner, _resolver, addressesToCache)
{
require(_proxy != address(0), "_proxy cannot be 0");
require(_owner != 0, "_owner cannot be 0");
currencyKey = _currencyKey;
}
/* ========== MUTATIVE FUNCTIONS ========== */
function transfer(address to, uint value) public optionalProxy returns (bool) {
_ensureCanTransfer(messageSender, value);
// transfers to FEE_ADDRESS will be exchanged into sUSD and recorded as fee
if (to == FEE_ADDRESS) {
return _transferToFeeAddress(to, value);
}
// transfers to 0x address will be burned
if (to == address(0)) {
return _internalBurn(messageSender, value);
}
return super._internalTransfer(messageSender, to, value);
}
function transferAndSettle(address to, uint value) public optionalProxy returns (bool) {
systemStatus().requireSynthActive(currencyKey);
(, , uint numEntriesSettled) = exchanger().settle(messageSender, currencyKey);
// Save gas instead of calling transferableSynths
uint balanceAfter = value;
if (numEntriesSettled > 0) {
balanceAfter = tokenState.balanceOf(messageSender);
}
// Reduce the value to transfer if balance is insufficient after reclaimed
value = value > balanceAfter ? balanceAfter : value;
return super._internalTransfer(messageSender, to, value);
}
function transferFrom(address from, address to, uint value) public optionalProxy returns (bool) {
_ensureCanTransfer(from, value);
return _internalTransferFrom(from, to, value);
}
function transferFromAndSettle(address from, address to, uint value) public optionalProxy returns (bool) {
systemStatus().requireSynthActive(currencyKey);
(, , uint numEntriesSettled) = exchanger().settle(from, currencyKey);
// Save gas instead of calling transferableSynths
uint balanceAfter = value;
if (numEntriesSettled > 0) {
balanceAfter = tokenState.balanceOf(from);
}
// Reduce the value to transfer if balance is insufficient after reclaimed
value = value >= balanceAfter ? balanceAfter : value;
return _internalTransferFrom(from, to, value);
}
/**
* @notice _transferToFeeAddress function
* non-sUSD synths are exchanged into sUSD via synthInitiatedExchange
* notify feePool to record amount as fee paid to feePool */
function _transferToFeeAddress(address to, uint value) internal returns (bool) {
uint amountInUSD;
// sUSD can be transferred to FEE_ADDRESS directly
if (currencyKey == "sUSD") {
amountInUSD = value;
super._internalTransfer(messageSender, to, value);
} else {
// else exchange synth into sUSD and send to FEE_ADDRESS
amountInUSD = exchanger().exchange(messageSender, currencyKey, value, "sUSD", FEE_ADDRESS);
}
// Notify feePool to record sUSD to distribute as fees
feePool().recordFeePaid(amountInUSD);
return true;
}
// Allow synthetix to issue a certain number of synths from an account.
// forward call to _internalIssue
function issue(address account, uint amount) external onlyInternalContracts {
_internalIssue(account, amount);
}
// Allow synthetix or another synth contract to burn a certain number of synths from an account.
// forward call to _internalBurn
function burn(address account, uint amount) external onlyInternalContracts {
_internalBurn(account, amount);
}
function _internalIssue(address account, uint amount) internal {
tokenState.setBalanceOf(account, tokenState.balanceOf(account).add(amount));
totalSupply = totalSupply.add(amount);
emitTransfer(address(0), account, amount);
emitIssued(account, amount);
}
function _internalBurn(address account, uint amount) internal returns (bool) {
tokenState.setBalanceOf(account, tokenState.balanceOf(account).sub(amount));
totalSupply = totalSupply.sub(amount);
emitTransfer(account, address(0), amount);
emitBurned(account, amount);
return true;
}
// Allow owner to set the total supply on import.
function setTotalSupply(uint amount) external optionalProxy_onlyOwner {
totalSupply = amount;
}
/* ========== VIEWS ========== */
function systemStatus() internal view returns (ISystemStatus) {
return ISystemStatus(requireAndGetAddress(CONTRACT_SYSTEMSTATUS, "Missing SystemStatus address"));
}
function synthetix() internal view returns (ISynthetix) {
return ISynthetix(requireAndGetAddress(CONTRACT_SYNTHETIX, "Missing Synthetix address"));
}
function feePool() internal view returns (IFeePool) {
return IFeePool(requireAndGetAddress(CONTRACT_FEEPOOL, "Missing FeePool address"));
}
function exchanger() internal view returns (IExchanger) {
return IExchanger(requireAndGetAddress(CONTRACT_EXCHANGER, "Missing Exchanger address"));
}
function issuer() internal view returns (IIssuer) {
return IIssuer(requireAndGetAddress(CONTRACT_ISSUER, "Missing Issuer address"));
}
function _ensureCanTransfer(address from, uint value) internal view {
require(exchanger().maxSecsLeftInWaitingPeriod(from, currencyKey) == 0, "Cannot transfer during waiting period");
require(transferableSynths(from) >= value, "Insufficient balance after any settlement owing");
systemStatus().requireSynthActive(currencyKey);
}
function transferableSynths(address account) public view returns (uint) {
(uint reclaimAmount, , ) = exchanger().settlementOwing(account, currencyKey);
// Note: ignoring rebate amount here because a settle() is required in order to
// allow the transfer to actually work
uint balance = tokenState.balanceOf(account);
if (reclaimAmount > balance) {
return 0;
} else {
return balance.sub(reclaimAmount);
}
}
/* ========== INTERNAL FUNCTIONS ========== */
function _internalTransferFrom(address from, address to, uint value) internal returns (bool) {
// Skip allowance update in case of infinite allowance
if (tokenState.allowance(from, messageSender) != uint(-1)) {
// Reduce the allowance by the amount we're transferring.
// The safeSub call will handle an insufficient allowance.
tokenState.setAllowance(from, messageSender, tokenState.allowance(from, messageSender).sub(value));
}
return super._internalTransfer(from, to, value);
}
/* ========== MODIFIERS ========== */
modifier onlyInternalContracts() {
bool isSynthetix = msg.sender == address(synthetix());
bool isFeePool = msg.sender == address(feePool());
bool isExchanger = msg.sender == address(exchanger());
bool isIssuer = msg.sender == address(issuer());
require(
isSynthetix || isFeePool || isExchanger || isIssuer,
"Only Synthetix, FeePool, Exchanger or Issuer contracts allowed"
);
_;
}
/* ========== EVENTS ========== */
event Issued(address indexed account, uint value);
bytes32 private constant ISSUED_SIG = keccak256("Issued(address,uint256)");
function emitIssued(address account, uint value) internal {
proxy._emit(abi.encode(value), 2, ISSUED_SIG, bytes32(account), 0, 0);
}
event Burned(address indexed account, uint value);
bytes32 private constant BURNED_SIG = keccak256("Burned(address,uint256)");
function emitBurned(address account, uint value) internal {
proxy._emit(abi.encode(value), 2, BURNED_SIG, bytes32(account), 0, 0);
}
}Contract Security Audit
- No Contract Security Audit Submitted- Submit Audit Here
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Multichain Portfolio | 30 Chains
| Chain | Token | Portfolio % | Price | Amount | Value |
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.