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Escrow.sol
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Escrow.sol
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pragma solidity ^0.5.0;
pragma experimental ABIEncoderV2;
contract Escrow {
struct Deposit {
address payable from;
bytes32 messageHash;
address payable beneficiary;
address payable witness;
uint256 expirationTime;
uint256 beneficiaryAmount;
uint256 witnessFee;
uint256 relayerFee;
bool exists;
}
mapping (bytes32 => Deposit) deposits;
mapping (bytes32 => mapping(address => bytes32[])) depositLists;
mapping (bytes32 => uint256) depositIndexes;
function getDepositHash(
address from,
bytes32 messageHash,
address beneficiary,
address witness,
uint256 expirationTime
)
public pure returns (bytes32)
{
return keccak256(abi.encodePacked(from, messageHash, beneficiary, witness, expirationTime));
}
function getDeposits(
bytes32 messageHash, address witness
)
public view returns (bytes32[] memory)
{
return depositLists[messageHash][witness];
}
function getDeposit(
bytes32 depositHash
)
public view returns (Deposit memory)
{
return deposits[depositHash];
}
function deposit(
bytes32 messageHash,
address payable beneficiary,
address payable witness,
uint256 expirationTime,
uint256 witnessFee,
uint256 relayerFee
)
external payable
{
address payable from = msg.sender;
uint256 value = msg.value;
require(value > 0 && value > witnessFee + relayerFee);
uint256 beneficiaryAmount = value - witnessFee - relayerFee;
bytes32 depositHash = getDepositHash(from, messageHash, beneficiary, witness, expirationTime);
require(deposits[depositHash].exists == false);
Deposit memory newDeposit = Deposit(
from, messageHash, beneficiary, witness, expirationTime, beneficiaryAmount, witnessFee, relayerFee, true
);
deposits[depositHash] = newDeposit;
depositLists[messageHash][witness].push(depositHash);
depositIndexes[depositHash] = depositLists[messageHash][witness].length - 1;
emit NewDeposit(depositHash);
}
function release(bytes32 depositHash, bytes calldata signature)
external
{
address payable relayer = msg.sender;
Deposit memory currentDeposit = deposits[depositHash];
require(currentDeposit.exists == true);
require(recover(currentDeposit.messageHash, signature) == currentDeposit.witness);
require(now < currentDeposit.expirationTime);
uint256 depositIndex = depositIndexes[depositHash];
bytes32[] storage list = depositLists[currentDeposit.messageHash][currentDeposit.witness];
delete list[depositIndex];
delete deposits[depositHash];
delete depositIndexes[depositHash];
currentDeposit.beneficiary.transfer(currentDeposit.beneficiaryAmount);
currentDeposit.witness.transfer(currentDeposit.witnessFee);
relayer.transfer(currentDeposit.relayerFee);
emit WithdrawnDeposit(currentDeposit.from, currentDeposit.beneficiary, currentDeposit.beneficiaryAmount, currentDeposit.messageHash);
}
function refund(bytes32 depositHash)
external
{
address payable relayer = msg.sender;
Deposit memory currentDeposit = deposits[depositHash];
require(currentDeposit.exists == true);
require(now >= currentDeposit.expirationTime);
uint256 depositIndex = depositIndexes[depositHash];
bytes32[] storage list = depositLists[currentDeposit.messageHash][currentDeposit.witness];
delete deposits[depositHash];
delete depositIndexes[depositHash];
delete list[depositIndex];
uint256 refundAmount = currentDeposit.beneficiaryAmount + currentDeposit.witnessFee;
currentDeposit.from.transfer(refundAmount);
relayer.transfer(currentDeposit.relayerFee);
emit RefundedDeposit(currentDeposit.from, refundAmount, currentDeposit.messageHash);
}
function addWitnessFee(bytes32 depositHash)
public payable
{
deposits[depositHash].witnessFee += msg.value;
}
function addRelayerFee(bytes32 depositHash)
public payable
{
deposits[depositHash].relayerFee += msg.value;
}
function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {
bytes32 r;
bytes32 s;
uint8 v;
if (signature.length != 65) {
return (address(0));
}
assembly {
r := mload(add(signature, 0x20))
s := mload(add(signature, 0x40))
v := byte(0, mload(add(signature, 0x60)))
}
if (v < 27) {
v += 27;
}
if (v != 27 && v != 28) {
return (address(0));
} else {
return ecrecover(hash, v, r, s);
}
}
event NewDeposit(bytes32 depositHash);
event WithdrawnDeposit(address from, address beneficiary, uint256 amount, bytes32 messageHash);
event RefundedDeposit(address recipient, uint256 amount, bytes32 messageHash);
}