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【智能合約】範例合約.sol

pragma solidity ^0.4.18;

contract Fbethorder {
    
    event ActivityInfor(string location, string Abstract);
    
    uint256 constant public ticketFee = 5 ether;  // 票價 + 押金
    uint256 constant public deposit = 2 ether;    // 壓金
    
    mapping (address => uint256) public ticketNumberMap;        
    mapping (uint256 => address) public id2AddrMap;
    mapping (address => bool) public userJoinMap;       // User Join ? true : False
    
    uint256 public userAmount;
    uint256 public ticketNumber;
    address public FbWallet;
    uint256 public activityEndTime; 
    bool public activityStatus;        // activity start ? True : False
 
    address public fborder;
    uint256 public nowtime;
    uint256 public maxAttendees;
    uint256 public startTime;

    function Fbethorder(uint256 _maxAttendees, uint256 _startTime, string _location, string _Abstract) public {
        FbWallet = msg.sender;
        maxAttendees = _maxAttendees;
        userAmount = 0;
        startTime = _startTime;
        activityStatus = false;
        fborder = msg.sender;
        emit ActivityInfor( _location, _Abstract );
    }
    
    function GetNow() public {
        nowtime = now;
    }
    
    function () payable external {
        GetTicket(msg.sender);
    }

    function GetTicket (address participant) payable public {
        require(msg.value >= ticketFee && ticketNumberMap[participant] == 0);
        userAmount ++;
        ticketNumber ++;
        require(userAmount <= maxAttendees);
        ticketNumberMap[participant] = ticketNumber;
        id2AddrMap[userAmount] = participant;
    }

    /* 發起人設定結束時間，時間使用 UTC + 8 */
    /* 活動開始時設定結束時間 */
    function ActivityEndTime(uint256 endTime) public {
        require(FbWallet == msg.sender);       
        activityEndTime = endTime;
        activityStatus = true;
    }
    
    /* 確任使用者, 紀錄出席者 */
    function UserAtt( ) public {
        require(activityStatus == true && ticketNumberMap[msg.sender] != 0 && userJoinMap[msg.sender] == false);
        userJoinMap[msg.sender] = true;
    }
    
    /* 課程結束，準時退回押金，延遲罰款 */
    function Withdraw () public {
        require(FbWallet == msg.sender);
        for(uint i = 1; i <= userAmount; i++){
            if(userJoinMap[id2AddrMap[i]] == false) continue;
            /* 這邊時間要減去 UTC+8 */
            if(now <= activityEndTime + 1 minutes){
                id2AddrMap[i].transfer(deposit);
            }else {
                id2AddrMap[i].transfer(deposit + 1 ether);
            }
        }
        FbWallet.transfer(this.balance);
    }
}