在近协议 Rust 智能合约众筹中接收和发送代币

Question

如何在 Rust 中编写用于众筹/ICO 的智能合约？我正在尝试用 rust 重写 openzeppelin。

Crowdsale.sol

构造函数在 Solidity 中采用令牌参数，其中 IERC20 是一个接口。

constructor (uint256 rate, address payable wallet, IERC20 token) public {
        require(rate > 0, "Crowdsale: rate is 0");
        require(wallet != address(0), "Crowdsale: wallet is the zero address");
        require(address(token) != address(0), "Crowdsale: token is the zero address");

        _rate = rate;
        _wallet = wallet;
        _token = token;
    }

如何在 Rust 协议中做到这一点？ 我应该传递智能合约的地址吗？

    #[near_bindgen]
    impl Crowdsale {    
        #[init]
        pub fn new(rate: U128, owner_id: AccountId, token_id: AccountId) -> Self {
            let mut ft = Self {
                owner_id: owner_id, 
               // owner id is the address of this smart contract with fungible token balance
                token_id: token_id,
                rate: rate;
            }
           ft
       }
    }

还需要buyTokens的rust函数，接收near token到token_id，然后将可互换的token部分转移给受益人。

会是这样吗：

    #[payable]
    pub fn buyTokens(&mut self, benificiary_id:AccountId, neartoken:u128) {
    // Receive near token
    
    // Send fungible token
    owner_id.transfer(benificiary_id, amount);
    }