如何做一个delay和"to bind"两个变量？

Question

我有合同“行李”。车主（比如我）需要把它转移到行李房一段时间。他不能早于规定的时间得到它。请告诉我：

a) 如何“延期”（延期结束前无法领取行李）

b) 将主人地址与行李地址绑定（可查看行李是否为主人所要求）

contract LuggageStorage
{
    Luggage luggage;
    address owner;
    constructor(LuggageStorage _luggage) public 
    {
        luggage = _luggage;
        owner = msg.sender;
    }
    function storeLuggage (uint lAddress, uint time) public
    { 
        luggage.transferFrom(msg.sender, owner, lAddress); //the function transfers luggage to new owner
        
    }
    function retrieveLuggage(uint lAddress) public 
    {         
        luggage.transferFrom(owner, msg.sender, lAddress); 
    }
}

Answer 1

对于延迟，您可以将 block.timestamp 全局变量（returns 当前时间戳）与之前存储的时间戳进行比较。

pragma solidity ^0.8.0;

contract LuggageStorage {
    uint256 releaseDate;
    
    constructor(uint256 _releaseDate) {
        releaseDate = _releaseDate;
    }
    
    function retrieveLuggage() public {
        /*
         * `block.timestamp` is timestamp of the current transaction
         * `releaseDate` is the manually defined timestamp
         */

        require(block.timestamp >= releaseDate, "You're too early");

        // ... and here goes your retrieve implementation
    }
}

检查所有者几乎是一样的。您需要定义 owner 地址并根据 msg.sender.

进行验证

pragma solidity ^0.8.0;

contract LuggageStorage {
    address owner;
    
    constructor(address _owner) {
        owner = _owner;
    }
    
    function retrieveLuggage() public {
        require(msg.sender == owner, "Can by only requested by the owner");
        // ... here goes your retrieve implementation
    }
}

随时查看 OpenZeppelin 的一些合约以获得更多灵感，尤其是 Ownable and Timelock。

如何做一个delay和"to bind"两个变量？

How to make a delay and "to bind" two variables?

solidity