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0 Ether
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Note: This contract matches the deployed ByteCode of the Source Code for Contract 0x5Eb054cfAc1e39e3C1b5C11A1b9C019e803fA033
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 2020-03-30 */ /* ⚠⚠⚠ 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); } }
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Contract Creation Code
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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.