ExampleofHouseLeasingContract

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House-leasing contract

    House-leasing contract, takes assets as the transaction subject between lessor and lessee. There are 7 terms in the contract, including two aspects:
    1) the lessor can register the house after depositing the rental deposit, and
    2) the lessee can keep the right to use the house during the leasing period after depositing the rent. After confirming the leased house, the contract requires that the lessee shall pay the rent, and the lessor must transfer the right to the lessee within one week. Meanwhile, the contract stipulates the pre-condition for the lessor to charge the rent paid by the lessee, and the postcondition for both parties to get their deposits back after the house inspection.

// HouseLease.scs
contract Houselease{

party Renter{
registerHouse()
collectRent()
collectBail()
transferHouse()
checkHouse()
}


party Tenant{
confirmLease(endLeasingDuration:Date,
payDuration:Date)
payRent()
returnHouse()
collectBail()
}


house : House
infos : contractInfo


term term1 : Renter can registerHouse
while deposit $infos::renterBail.


term term2 : Tenant can confirmLease
when after Renter did registerHouse
while deposit $infos::tenantBail
where infos::startLeasingTime = now and
infos::endLeasingTime = endLeasingDuration + now
and infos::payDate = payDuration + now
and infos::payDuration = payDuration.


term term3 : Renter must transferHouse
when within 7 day after Tenant did confirmLease
while deposit $ house::useRight.


term term4 : Tenant must payRent
when before Tenant did confirmLease
while deposit $infos::rental
withdraw $house::useRight
where infos::payDate = infos::payDate + infos::payDuration
and infos::totalRental = infos::totalRental + infos::rental.


term term5 : Renter can collectRent
while withdraw $infos::totalRental
where infos::totalRental = 0.


term term6 : Tenant must returnHouse
when within 7 day after Renter did checkHouse
while deposit $house::useRight
transfer $house::useRight to Renter.


term term7_1 : Renter can collectBail
when within 15 day after Renter did checkHouse
while withdraw $infos::renterBail.


term term7_2 : Tenant can collectBail
when within 15 day after Renter did checkHouse
while withdraw $infos::tenantBail.


type contractInfo {
renterBail : Money
tenantBail : Money
rental : Money
totalRental : Money
penalty : Money
startLeasingTime : Date
endLeasingTime : Date
payDate : Date
payDuration : Date
}


type House {
ownershipNumber : integer
location : String
area : integer
usage : String
price : Money
useRight : String
usufruct : String
dispositionRight : String
possessionRight : String
}

} 

/* Houselease.sol */
pragma solidity ^0.4.0;
		
import "./RenterT.sol";
import "./TenantT.sol";

contract Houselease {
	
	RenterT Renter;
	TenantT Tenant;
	
	House house;
	contractInfo infos;
	
	uint start;
	struct contractInfo{
		uint renterBail;
		uint tenantBail;
		uint rental;
		uint totalRental;
		uint penalty;
		uint startLeasingTime;
		uint endLeasingTime;
		uint payDate;
		uint payDuration;
	}
	struct House{
		uint ownershipNumber;
		bytes32 location;
		uint area;
		bytes32 usage;
		uint price;
		uint useRight;
		uint usufruct;
		uint dispositionRight;
		uint possessionRight;
	}
	
	function Houselease(){
		start = now;
		Renter = new RenterT();
		Tenant = new TenantT();
	}

	modifier onlyRenter{
		require(Renter.contains(msg.sender));
		_;
	}
	
	modifier onlyTenant{
		require(Tenant.contains(msg.sender));
		_;
	}
	
	modifier term2Modifier{
		require(now > Renter.registerHouseTime());
		require(infos.tenantBail > 0);
		_;
	}
	
	modifier term3Modifier{
		require((now > Tenant.confirmLeaseTime()) &&(now < Tenant.confirmLeaseTime()+604800));
		require(house.useRight > 0);
		_;
	}
	
	modifier term4Modifier{
		require(now < Tenant.confirmLeaseTime());
		require(infos.rental > 0);
		_;
	}
	
	modifier term6Modifier{
		require((now > Renter.checkHouseTime()) &&(now < Renter.checkHouseTime()+604800));
		require(house.useRight > 0);
		_;
	}
	
	modifier term7_1Modifier{
		require((now > Renter.checkHouseTime()) &&(now < Renter.checkHouseTime()+1296000));
		_;
	}
	
	modifier term7_2Modifier{
		require((now > Renter.checkHouseTime()) &&(now < Renter.checkHouseTime()+1296000));
		_;
	}
	
	function registerHouse() onlyRenter() public payable {
		//USER CODE HERE
		//CHECK
	
	}
	
	function confirmLease(uint endLeasingDuration, uint payDuration) onlyTenant() term2Modifier() public payable {
		//USER CODE HERE
		infos.startLeasingTime = now;
		infos.endLeasingTime = endLeasingDuration + now;
		infos.payDate = payDuration + now;
		infos.payDuration = payDuration;
		//CHECK
		assert(infos.startLeasingTime == now && (infos.endLeasingTime == endLeasingDuration + now && (infos.payDate == payDuration + now && infos.payDuration == payDuration)));
	}
	
	function transferHouse() onlyRenter() term3Modifier() public payable {
		//USER CODE HERE
		//CHECK
	
	}
	
	function payRent() onlyTenant() term4Modifier() public payable {
		//USER CODE HERE
		infos.payDate = infos.payDate + infos.payDuration;
		infos.totalRental = infos.totalRental + infos.rental;
		msg.sender.transfer(house.useRight);
		//CHECK
		assert(infos.payDate == infos.payDate + infos.payDuration && infos.totalRental == infos.totalRental + infos.rental);
	}
	
	function collectRent() onlyRenter() term7_1Modifier() public payable {
		//USER CODE HERE
		infos.totalRental = 0;
		msg.sender.transfer(infos.totalRental);
		//CHECK
		assert(infos.totalRental == 0);
	}
	
	function returnHouse() onlyTenant() term6Modifier() public payable {
		//USER CODE HERE
		address(Renter).transfer(house.useRight);
		//CHECK
	
	}
	
}
 
/* RenterT.sol */
pragma solidity ^0.4.22;

contract RenterT{
	
	
	//attributes of actionregisterHouse
	bool _isregisterHouseDone;
	uint _registerHouseTime;
	
	//attributes of actioncollectRent
	bool _iscollectRentDone;
	uint _collectRentTime;
	
	//attributes of actioncollectBail
	bool _iscollectBailDone;
	uint _collectBailTime;
	
	//attributes of actiontransferHouse
	bool _istransferHouseDone;
	uint _transferHouseTime;
	
	//attributes of actioncheckHouse
	bool _ischeckHouseDone;
	uint _checkHouseTime;
	
	uint _max;
	bool _isRenterDone;
	uint _i;
	
	address[] _RenterAddress;
	function RenterT(){
		_max = now*1000;
	}
	
	function regist(address a) public {
		_RenterAddress[_i] = a;
		_i++;
	}
	
	function getAddress(uint _i) public returns (address a){
		return _RenterAddress[_i];
	}
	
	function registerHouseDone(address a){
		_registerHouseTime = now;
		_isRenterDone = true;
	}
	
	function registerHouseTime() returns (uint result){
	    if(_isregisterHouseDone){
	        return _registerHouseTime;
	    }
	    return _max;
	}
	
	function collectRentDone(address a){
		_collectRentTime = now;
		_isRenterDone = true;
	}
	
	function collectRentTime() returns (uint result){
	    if(_iscollectRentDone){
	        return _collectRentTime;
	    }
	    return _max;
	}
	
	function collectBailDone(address a){
		_collectBailTime = now;
		_isRenterDone = true;
	}
	
	function collectBailTime() returns (uint result){
	    if(_iscollectBailDone){
	        return _collectBailTime;
	    }
	    return _max;
	}
	
	function transferHouseDone(address a){
		_transferHouseTime = now;
		_isRenterDone = true;
	}
	
	function transferHouseTime() returns (uint result){
	    if(_istransferHouseDone){
	        return _transferHouseTime;
	    }
	    return _max;
	}
	
	function checkHouseDone(address a){
		_checkHouseTime = now;
		_isRenterDone = true;
	}
	
	function checkHouseTime() returns (uint result){
	    if(_ischeckHouseDone){
	        return _checkHouseTime;
	    }
	    return _max;
	}
	
	function contains(address a) returns (bool result) {
	    for (uint _j = 0; _j < _RenterAddress.length; _j++ ) {  //for loop example
            if (a == _RenterAddress[_j]){
                return true;
            }         
      }
      return false;
	}
	
}
 
/* TenantT.sol */
pragma solidity ^0.4.22;

contract TenantT{
	
	
	//attributes of actionconfirmLease
	bool _isconfirmLeaseDone;
	uint _confirmLeaseTime;
	
	//attributes of actionpayRent
	bool _ispayRentDone;
	uint _payRentTime;
	
	//attributes of actionreturnHouse
	bool _isreturnHouseDone;
	uint _returnHouseTime;
	
	//attributes of actioncollectBail
	bool _iscollectBailDone;
	uint _collectBailTime;
	
	uint _max;
	bool _isTenantDone;
	uint _i;
	
	address[] _TenantAddress;
	function TenantT(){
		_max = now*1000;
	}
	
	function regist(address a) public {
		_TenantAddress[_i] = a;
		_i++;
	}
	
	function getAddress(uint _i) public returns (address a){
		return _TenantAddress[_i];
	}
	
	function confirmLeaseDone(address a){
		_confirmLeaseTime = now;
		_isTenantDone = true;
	}
	
	function confirmLeaseTime() returns (uint result){
	    if(_isconfirmLeaseDone){
	        return _confirmLeaseTime;
	    }
	    return _max;
	}
	
	function payRentDone(address a){
		_payRentTime = now;
		_isTenantDone = true;
	}
	
	function payRentTime() returns (uint result){
	    if(_ispayRentDone){
	        return _payRentTime;
	    }
	    return _max;
	}
	
	function returnHouseDone(address a){
		_returnHouseTime = now;
		_isTenantDone = true;
	}
	
	function returnHouseTime() returns (uint result){
	    if(_isreturnHouseDone){
	        return _returnHouseTime;
	    }
	    return _max;
	}
	
	function collectBailDone(address a){
		_collectBailTime = now;
		_isTenantDone = true;
	}
	
	function collectBailTime() returns (uint result){
	    if(_iscollectBailDone){
	        return _collectBailTime;
	    }
	    return _max;
	}
	
	function contains(address a) returns (bool result) {
	    for (uint _j = 0; _j < _TenantAddress.length; _j++ ) {  //for loop example
            if (a == _TenantAddress[_j]){
                return true;
            }         
      }
      return false;
	}
	
}
取自“https://www.smartlegalcontract.cn/mediawiki/index.php?title=ExampleofHouseLeasingContract&oldid=515”