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HashedTimelock.json
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{
"contractName": "HashedTimelock",
"abi": [
{
"anonymous": false,
"inputs": [
{
"indexed": true,
"name": "contractId",
"type": "bytes32"
},
{
"indexed": true,
"name": "sender",
"type": "address"
},
{
"indexed": true,
"name": "receiver",
"type": "address"
},
{
"indexed": false,
"name": "amount",
"type": "uint256"
},
{
"indexed": false,
"name": "hashlock",
"type": "bytes32"
},
{
"indexed": false,
"name": "timelock",
"type": "uint256"
}
],
"name": "LogHTLCNew",
"type": "event"
},
{
"anonymous": false,
"inputs": [
{
"indexed": true,
"name": "contractId",
"type": "bytes32"
}
],
"name": "LogHTLCWithdraw",
"type": "event"
},
{
"anonymous": false,
"inputs": [
{
"indexed": true,
"name": "contractId",
"type": "bytes32"
}
],
"name": "LogHTLCRefund",
"type": "event"
},
{
"constant": false,
"inputs": [
{
"name": "_receiver",
"type": "address"
},
{
"name": "_hashlock",
"type": "bytes32"
},
{
"name": "_timelock",
"type": "uint256"
}
],
"name": "newContract",
"outputs": [
{
"name": "contractId",
"type": "bytes32"
}
],
"payable": true,
"stateMutability": "payable",
"type": "function"
},
{
"constant": false,
"inputs": [
{
"name": "_contractId",
"type": "bytes32"
},
{
"name": "_preimage",
"type": "bytes32"
}
],
"name": "withdraw",
"outputs": [
{
"name": "",
"type": "bool"
}
],
"payable": false,
"stateMutability": "nonpayable",
"type": "function"
},
{
"constant": false,
"inputs": [
{
"name": "_contractId",
"type": "bytes32"
}
],
"name": "refund",
"outputs": [
{
"name": "",
"type": "bool"
}
],
"payable": false,
"stateMutability": "nonpayable",
"type": "function"
},
{
"constant": true,
"inputs": [
{
"name": "_contractId",
"type": "bytes32"
}
],
"name": "getContract",
"outputs": [
{
"name": "sender",
"type": "address"
},
{
"name": "receiver",
"type": "address"
},
{
"name": "amount",
"type": "uint256"
},
{
"name": "hashlock",
"type": "bytes32"
},
{
"name": "timelock",
"type": "uint256"
},
{
"name": "withdrawn",
"type": "bool"
},
{
"name": "refunded",
"type": "bool"
},
{
"name": "preimage",
"type": "bytes32"
}
],
"payable": false,
"stateMutability": "view",
"type": "function"
}
],
"bytecode": 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"source": "pragma solidity ^0.5.0;\n\n/**\n * @title Hashed Timelock Contracts (HTLCs) on Ethereum ETH.\n *\n * This contract provides a way to create and keep HTLCs for ETH.\n *\n * See HashedTimelockERC20.sol for a contract that provides the same functions \n * for ERC20 tokens.\n *\n * Protocol:\n *\n * 1) newContract(receiver, hashlock, timelock) - a sender calls this to create\n * a new HTLC and gets back a 32 byte contract id\n * 2) withdraw(contractId, preimage) - once the receiver knows the preimage of\n * the hashlock hash they can claim the ETH with this function\n * 3) refund() - after timelock has expired and if the receiver did not \n * withdraw funds the sender / creater of the HTLC can get their ETH \n * back with this function.\n */\ncontract HashedTimelock {\n\n event LogHTLCNew(\n bytes32 indexed contractId,\n address indexed sender,\n address indexed receiver,\n uint amount,\n bytes32 hashlock,\n uint timelock\n );\n event LogHTLCWithdraw(bytes32 indexed contractId);\n event LogHTLCRefund(bytes32 indexed contractId);\n\n struct LockContract {\n address payable sender;\n address payable receiver;\n uint amount;\n bytes32 hashlock; // sha-2 sha256 hash\n uint timelock; // UNIX timestamp seconds - locked UNTIL this time\n bool withdrawn;\n bool refunded;\n bytes32 preimage;\n }\n\n modifier fundsSent() {\n require(msg.value > 0, \"msg.value must be > 0\");\n _;\n }\n modifier futureTimelock(uint _time) {\n // only requirement is the timelock time is after the last blocktime (now).\n // probably want something a bit further in the future then this.\n // but this is still a useful sanity check:\n require(_time > now, \"timelock time must be in the future\");\n _;\n }\n modifier contractExists(bytes32 _contractId) {\n require(haveContract(_contractId), \"contractId does not exist\");\n _;\n }\n modifier hashlockMatches(bytes32 _contractId, bytes32 _x) {\n require(\n contracts[_contractId].hashlock == sha256(abi.encodePacked(_x)),\n \"hashlock hash does not match\"\n );\n _;\n }\n modifier withdrawable(bytes32 _contractId) {\n require(contracts[_contractId].receiver == msg.sender, \"withdrawable: not receiver\");\n require(contracts[_contractId].withdrawn == false, \"withdrawable: already withdrawn\");\n require(contracts[_contractId].timelock > now, \"withdrawable: timelock time must be in the future\");\n _;\n }\n modifier refundable(bytes32 _contractId) {\n require(contracts[_contractId].sender == msg.sender, \"refundable: not sender\");\n require(contracts[_contractId].refunded == false, \"refundable: already refunded\");\n require(contracts[_contractId].withdrawn == false, \"refundable: already withdrawn\");\n require(contracts[_contractId].timelock <= now, \"refundable: timelock not yet passed\");\n _;\n }\n\n mapping (bytes32 => LockContract) contracts;\n\n /**\n * @dev Sender sets up a new hash time lock contract depositing the ETH and \n * providing the reciever lock terms.\n *\n * @param _receiver Receiver of the ETH.\n * @param _hashlock A sha-2 sha256 hash hashlock.\n * @param _timelock UNIX epoch seconds time that the lock expires at. \n * Refunds can be made after this time.\n * @return contractId Id of the new HTLC. This is needed for subsequent \n * calls.\n */\n function newContract(address payable _receiver, bytes32 _hashlock, uint _timelock)\n external\n payable\n fundsSent\n futureTimelock(_timelock)\n returns (bytes32 contractId)\n {\n contractId = sha256(\n abi.encodePacked(\n msg.sender,\n _receiver,\n msg.value,\n _hashlock,\n _timelock\n )\n );\n\n // Reject if a contract already exists with the same parameters. The\n // sender must change one of these parameters to create a new distinct \n // contract.\n if (haveContract(contractId))\n revert();\n\n contracts[contractId] = LockContract(\n msg.sender,\n _receiver,\n msg.value,\n _hashlock,\n _timelock,\n false,\n false,\n 0x0\n );\n\n emit LogHTLCNew(\n contractId,\n msg.sender,\n _receiver,\n msg.value,\n _hashlock,\n _timelock\n );\n }\n\n /**\n * @dev Called by the receiver once they know the preimage of the hashlock.\n * This will transfer the locked funds to their address.\n *\n * @param _contractId Id of the HTLC.\n * @param _preimage sha256(_preimage) should equal the contract hashlock.\n * @return bool true on success\n */\n function withdraw(bytes32 _contractId, bytes32 _preimage)\n external\n contractExists(_contractId)\n hashlockMatches(_contractId, _preimage)\n withdrawable(_contractId)\n returns (bool)\n {\n LockContract storage c = contracts[_contractId];\n c.preimage = _preimage;\n c.withdrawn = true;\n c.receiver.transfer(c.amount);\n emit LogHTLCWithdraw(_contractId);\n return true;\n }\n\n /**\n * @dev Called by the sender if there was no withdraw AND the time lock has\n * expired. This will refund the contract amount.\n *\n * @param _contractId Id of HTLC to refund from.\n * @return bool true on success\n */\n function refund(bytes32 _contractId)\n external\n contractExists(_contractId)\n refundable(_contractId)\n returns (bool)\n {\n LockContract storage c = contracts[_contractId];\n c.refunded = true;\n c.sender.transfer(c.amount);\n emit LogHTLCRefund(_contractId);\n return true;\n }\n\n /**\n * @dev Get contract details.\n * @param _contractId HTLC contract id\n * @return All parameters in struct LockContract for _contractId HTLC\n */\n function getContract(bytes32 _contractId)\n public\n view\n returns (\n address sender,\n address receiver,\n uint amount,\n bytes32 hashlock,\n uint timelock,\n bool withdrawn,\n bool refunded,\n bytes32 preimage\n )\n {\n if (haveContract(_contractId) == false)\n return (address(0), address(0), 0, 0, 0, false, false, 0);\n LockContract storage c = contracts[_contractId];\n return (c.sender, c.receiver, c.amount, c.hashlock, c.timelock,\n c.withdrawn, c.refunded, c.preimage);\n }\n\n /**\n * @dev Is there a contract with id _contractId.\n * @param _contractId Id into contracts mapping.\n */\n function haveContract(bytes32 _contractId)\n internal\n view\n returns (bool exists)\n {\n exists = (contracts[_contractId].sender != address(0));\n }\n\n}\n",
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"documentation": "@title Hashed Timelock Contracts (HTLCs) on Ethereum ETH.\n * This contract provides a way to create and keep HTLCs for ETH.\n * See HashedTimelockERC20.sol for a contract that provides the same functions \nfor ERC20 tokens.\n * Protocol:\n * 1) newContract(receiver, hashlock, timelock) - a sender calls this to create\n a new HTLC and gets back a 32 byte contract id\n 2) withdraw(contractId, preimage) - once the receiver knows the preimage of\n the hashlock hash they can claim the ETH with this function\n 3) refund() - after timelock has expired and if the receiver did not \n withdraw funds the sender / creater of the HTLC can get their ETH \n back with this function.",
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