commit redpacket

.gitignore

@@ -0,0 +1,10 @@
+node_modules
+.env
+coverage
+coverage.json
+typechain
+artifacts
+.openzeppelin
+#Hardhat files
+cache
+artifacts

README.md

@@ -0,0 +1,15 @@
+# Basic Sample Hardhat Project
+
+This project demonstrates a basic Hardhat use case. It comes with a sample contract, a test for that contract, a sample script that deploys that contract, and an example of a task implementation, which simply lists the available accounts.
+
+Try running some of the following tasks:
+
+```shell
+npx hardhat accounts
+npx hardhat compile
+npx hardhat clean
+npx hardhat test
+npx hardhat node
+node scripts/sample-script.js
+npx hardhat help
+```

contracts/Greeter.sol

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+//SPDX-License-Identifier: Unlicense
+pragma solidity ^0.8.0;
+
+import "hardhat/console.sol";
+
+contract Greeter {
+    string private greeting;
+
+    constructor(string memory _greeting) {
+        console.log("Deploying a Greeter with greeting:", _greeting);
+        greeting = _greeting;
+    }
+
+    function greet() public view returns (string memory) {
+        return greeting;
+    }
+
+    function setGreeting(string memory _greeting) public {
+        console.log("Changing greeting from '%s' to '%s'", greeting, _greeting);
+        greeting = _greeting;
+    }
+}

contracts/redpacket.sol

@@ -0,0 +1,326 @@
+// SPDX-License-Identifier: MIT
+
+/**
+ * @author          Yisi Liu
+ * @contact         yisiliu@gmail.com
+ * @author_time     04/20/2021
+ * @maintainer      Hancheng Zhou, Yisi Liu
+ * @maintain_time   05/21/2021
+**/
+
+pragma solidity >= 0.8.0;
+import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
+import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
+import "@openzeppelin/contracts/utils/math/SafeMath.sol";
+import "@openzeppelin/contracts/proxy/utils/Initializable.sol";
+import "@openzeppelin/contracts/utils/cryptography/ECDSA.sol";
+
+/**幸运红包 */
+contract HappyRedPacketV2 is Initializable {
+    using SafeMath for uint256;
+    /**红包结构体对象 */
+    struct RedPacket {
+        Packed packed;
+        //红包领取清单
+        mapping(address => uint256) claimed_list;
+        //公钥
+        address public_key;
+        //创建者
+        address creator;
+    }
+
+    struct Packed {
+        uint256 packed1;            // 0 (128) total_tokens (96) expire_time(32)
+        uint256 packed2;            // 0 (64) token_addr (160) claimed_numbers(15) total_numbers(15) token_type(1) ifrandom(1)
+    }
+
+    //记录创建成功
+    event CreationSuccess(
+        uint total,
+        bytes32 id,
+        string name,
+        string message,
+        address creator,
+        uint creation_time,
+        address token_address,
+        uint number,
+        bool ifrandom,
+        uint duration
+    );
+    
+    //领取成功
+    event ClaimSuccess(
+        bytes32 id,
+        address claimer,
+        uint claimed_value,
+        address token_address
+    );
+
+    //退款成功
+    event RefundSuccess(
+        bytes32 id,
+        address token_address,
+        uint remaining_balance
+    );
+
+    using SafeERC20 for IERC20;
+    uint32 nonce;
+    mapping(bytes32 => RedPacket) redpacket_by_id;
+    bytes32 private seed;
+    uint256 constant MASK = 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF;
+
+    function initialize() public initializer {
+        seed = keccak256(abi.encodePacked("Former NBA Commissioner David St", block.timestamp, msg.sender));
+    }
+
+    // Inits a red packet instance
+    // _token_type: 0 - ETH  1 - ERC20
+    /*
+   _public_key 公钥
+   _number 红包个数 
+    _ifrandom 是否随机
+   _duration 红包期限
+   _seed
+   _message 信息
+   _name 
+   _token_type 令牌类型
+   _token_addr 令牌地址
+   _total_totkens 总币
+     */
+    function create_red_packet (address _public_key, uint _number, bool _ifrandom, uint _duration, 
+                                bytes32 _seed, string memory _message, string memory _name,
+                                uint _token_type, address _token_addr, uint _total_tokens) 
+    public payable {
+        nonce ++;
+        require(_total_tokens >= _number, "#tokens > #packets");
+        //至少一个红包数量
+        require(_number > 0, "At least 1 recipient");
+        //红包数量必须小于 256
+        require(_number < 256, "At most 255 recipients");
+        //token type 不能为 0 or 1
+        require(_token_type == 0 || _token_type == 1, "Unrecognizable token type");
+        //收款金额
+        uint256 received_amount = _total_tokens;
+        //如果令牌类型为0
+        if (_token_type == 0)
+            require(msg.value >= _total_tokens, "No enough ETH");
+        else if (_token_type == 1) {   //如果令牌类型为1
+            // https://github.com/DimensionDev/Maskbook/issues/4168
+            // `received_amount` is not necessarily equal to `_total_tokens`
+            uint256 balance_before_transfer = IERC20(_token_addr).balanceOf(address(this));
+            IERC20(_token_addr).safeTransferFrom(msg.sender, address(this), _total_tokens);
+            uint256 balance_after_transfer = IERC20(_token_addr).balanceOf(address(this));
+            received_amount = balance_after_transfer.sub(balance_before_transfer);
+            require(received_amount >= _number, "#received > #packets");
+        }
+
+        bytes32 _id = keccak256(abi.encodePacked(msg.sender, block.timestamp, nonce, seed, _seed));
+        {
+            uint _random_type = _ifrandom ? 1 : 0;
+            RedPacket storage redp = redpacket_by_id[_id];
+            redp.packed.packed1 = wrap1(received_amount, _duration);
+            redp.packed.packed2 = wrap2(_token_addr, _number, _token_type, _random_type);
+            redp.public_key = _public_key;
+            redp.creator = msg.sender;
+        }
+        {
+            // as a workaround for "CompilerError: Stack too deep, try removing local variables"
+            uint number = _number;
+            bool ifrandom = _ifrandom;
+            uint duration = _duration;
+            //创建成功
+            emit CreationSuccess(received_amount, _id, _name, _message, msg.sender, block.timestamp, _token_addr, number, ifrandom, duration);
+        }
+    }
+
+    // It takes the signed msg.sender message as verification passcode
+    //将签名的msg.sender 消息作为验证消息
+    function claim(bytes32 id, bytes memory signedMsg, address payable recipient) 
+    public returns (uint claimed) {
+
+        RedPacket storage rp = redpacket_by_id[id];
+        Packed memory packed = rp.packed;
+        // Unsuccessful
+        require (unbox(packed.packed1, 224, 32) > block.timestamp, "Expired");
+        uint total_number = unbox(packed.packed2, 239, 15);
+        uint claimed_number = unbox(packed.packed2, 224, 15);
+        require (claimed_number < total_number, "Out of stock");
+        
+        address public_key = rp.public_key;
+        require(_verify(signedMsg, public_key), "Verification failed");
+
+        uint256 claimed_tokens;
+        uint256 token_type = unbox(packed.packed2, 254, 1);
+        uint256 ifrandom = unbox(packed.packed2, 255, 1);
+        uint256 remaining_tokens = unbox(packed.packed1, 128, 96);
+        if (ifrandom == 1) {//如果是随机模式，则生成随机红包
+            if (total_number - claimed_number == 1)
+                claimed_tokens = remaining_tokens;
+            else 
+                claimed_tokens = random(seed, nonce) % SafeMath.div(SafeMath.mul(remaining_tokens, 2), total_number - claimed_number);
+            if (claimed_tokens == 0) 
+                claimed_tokens = 1;
+        } else {
+            if (total_number - claimed_number == 1) 
+                claimed_tokens = remaining_tokens;
+            else
+                claimed_tokens = SafeMath.div(remaining_tokens, (total_number - claimed_number));
+        }
+        rp.packed.packed1 = rewriteBox(packed.packed1, 128, 96, remaining_tokens - claimed_tokens);
+
+        // Penalize greedy attackers by placing duplication check at the very last
+        require(rp.claimed_list[msg.sender] == 0, "Already claimed");
+
+        rp.claimed_list[msg.sender] = claimed_tokens;
+        rp.packed.packed2 = rewriteBox(packed.packed2, 224, 15, claimed_number + 1);
+
+        // Transfer the red packet after state changing
+        //状态改变就发送红包
+        if (token_type == 0)
+            recipient.transfer(claimed_tokens);
+        else if (token_type == 1)
+            transfer_token(address(uint160(unbox(packed.packed2, 64, 160))), recipient, claimed_tokens);
+        // Claim success event
+        emit ClaimSuccess(id, recipient, claimed_tokens, address(uint160(unbox(packed.packed2, 64, 160))));
+        return claimed_tokens;
+    }
+
+    // as a workaround for "CompilerError: Stack too deep, try removing local variables"
+    function _verify(bytes memory signedMsg, address public_key) private view returns (bool verified) {
+        bytes memory prefix = "\x19Ethereum Signed Message:\n20";
+        bytes32 prefixedHash = keccak256(abi.encodePacked(prefix, msg.sender));
+        address calculated_public_key = ECDSA.recover(prefixedHash, signedMsg);
+        return (calculated_public_key == public_key);
+    }
+
+    // Returns 1. remaining value 2. total number of red packets 3. claimed number of red packets
+    //返回 1. 剩余币 2. 红包总数 3. 已领取红包数
+    function check_availability(bytes32 id) external view returns ( address token_address, uint balance, uint total, 
+                                                                    uint claimed, bool expired, uint256 claimed_amount) {
+        RedPacket storage rp = redpacket_by_id[id];
+        Packed memory packed = rp.packed;
+        return (
+            address(uint160(unbox(packed.packed2, 64, 160))), 
+            unbox(packed.packed1, 128, 96), 
+            unbox(packed.packed2, 239, 15), 
+            unbox(packed.packed2, 224, 15), 
+            block.timestamp > unbox(packed.packed1, 224, 32), 
+            rp.claimed_list[msg.sender]
+        );
+    }
+
+    /**退钱 */
+    function refund(bytes32 id) public {
+        RedPacket storage rp = redpacket_by_id[id];
+        Packed memory packed = rp.packed;
+        address creator = rp.creator;
+        require(creator == msg.sender, "Creator Only");
+        require(unbox(packed.packed1, 224, 32) <= block.timestamp, "Not expired yet");
+        uint256 remaining_tokens = unbox(packed.packed1, 128, 96);
+        require(remaining_tokens != 0, "None left in the red packet");
+
+        uint256 token_type = unbox(packed.packed2, 254, 1);
+        address token_address = address(uint160(unbox(packed.packed2, 64, 160)));
+
+        rp.packed.packed1 = rewriteBox(packed.packed1, 128, 96, 0);
+
+        if (token_type == 0) {
+            payable(msg.sender).transfer(remaining_tokens);
+        }
+        else if (token_type == 1) {
+            transfer_token(token_address, msg.sender, remaining_tokens);
+        }
+        //退钱成功
+        emit RefundSuccess(id, token_address, remaining_tokens);
+    }
+
+//------------------------------------------------------------------
+    /**
+     * position      position in a memory block
+     * size          data size
+     * data          data
+     * box() inserts the data in a 256bit word with the given position and returns it
+     * data is checked by validRange() to make sure it is not over size 
+    **/
+
+    function box (uint16 position, uint16 size, uint256 data) internal pure returns (uint256 boxed) {
+        require(validRange(size, data), "Value out of range BOX");
+        assembly {
+            // data << position
+            boxed := shl(position, data)
+        }
+    }
+
+    /**
+     * position      position in a memory block
+     * size          data size
+     * base          base data
+     * unbox() extracts the data out of a 256bit word with the given position and returns it
+     * base is checked by validRange() to make sure it is not over size 
+    **/
+
+    function unbox (uint256 base, uint16 position, uint16 size) internal pure returns (uint256 unboxed) {
+        require(validRange(256, base), "Value out of range UNBOX");
+        assembly {
+            // (((1 << size) - 1) & base >> position)
+            unboxed := and(sub(shl(size, 1), 1), shr(position, base))
+
+        }
+    }
+
+    /**
+     * size          data size
+     * data          data
+     * validRange()  checks if the given data is over the specified data size
+    **/
+
+    function validRange (uint16 size, uint256 data) internal pure returns(bool ifValid) { 
+        assembly {
+            // 2^size > data or size ==256
+            ifValid := or(eq(size, 256), gt(shl(size, 1), data))
+        }
+    }
+
+    /**
+     * _box          32byte data to be modified
+     * position      position in a memory block
+     * size          data size
+     * data          data to be inserted
+     * rewriteBox() updates a 32byte word with a data at the given position with the specified size
+    **/
+
+    function rewriteBox (uint256 _box, uint16 position, uint16 size, uint256 data) 
+                        internal pure returns (uint256 boxed) {
+        assembly {
+            // mask = ~((1 << size - 1) << position)
+            // _box = (mask & _box) | ()data << position)
+            boxed := or( and(_box, not(shl(position, sub(shl(size, 1), 1)))), shl(position, data))
+        }
+    }
+
+    function transfer_token(address token_address, address recipient_address, uint amount) internal{
+        IERC20(token_address).safeTransfer(recipient_address, amount);
+    }
+    
+    // A boring wrapper
+    function random(bytes32 _seed, uint32 nonce_rand) internal view returns (uint rand) {
+        return uint(keccak256(abi.encodePacked(nonce_rand, msg.sender, _seed, block.timestamp))) + 1 ;
+    }
+    
+    function wrap1 (uint _total_tokens, uint _duration) internal view returns (uint256 packed1) {
+        uint256 _packed1 = 0;
+        _packed1 |= box(128, 96, _total_tokens);        // total tokens = 80 bits = ~8 * 10^10 18 decimals
+        _packed1 |= box(224, 32, (block.timestamp + _duration));    // expiration_time = 32 bits (until 2106)
+        return _packed1;
+    }
+
+    function wrap2 (address _token_addr, uint _number, uint _token_type, uint _ifrandom) internal pure returns (uint256 packed2) {
+        uint256 _packed2 = 0;
+        _packed2 |= box(64, 160, uint160(_token_addr));    // token_address = 160 bits
+        _packed2 |= box(224, 15, 0);                   // claimed_number = 14 bits 16384
+        _packed2 |= box(239, 15, _number);               // total_number = 14 bits 16384
+        _packed2 |= box(254, 1, _token_type);             // token_type = 1 bit 2
+        _packed2 |= box(255, 1, _ifrandom);                 // ifrandom = 1 bit 2
+        return _packed2;
+    }
+}

contracts/redpacket_proxy.sol

@@ -0,0 +1,336 @@
+// SPDX-License-Identifier: MIT
+
+/**
+ * @author          Yisi Liu
+ * @contact         yisiliu@gmail.com
+ * @author_time     04/20/2021
+ * @maintainer      Hancheng Zhou, Yisi Liu
+ * @maintain_time   05/21/2021
+**/
+
+pragma solidity >= 0.8.0;
+import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
+// import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
+import "@openzeppelin/contracts/utils/math/SafeMath.sol";
+import "@openzeppelin/contracts/utils/cryptography/ECDSA.sol";
+import "@openzeppelin/contracts/proxy/utils/Initializable.sol";
+import "@openzeppelin/contracts-upgradeable/token/ERC20/utils/SafeERC20Upgradeable.sol";
+import "hardhat/console.sol";
+
+/**幸运红包 */
+contract HappyRedPacket  is Initializable {
+    using SafeMath for uint256;
+    /**红包结构体对象 */
+    struct RedPacket {
+        Packed packed;
+        //红包领取清单
+        mapping(address => uint256) claimed_list;
+        //公钥
+        address public_key;
+        //创建者
+        address creator;
+    }
+
+    struct Packed {
+        uint256 packed1;            // 0 (128) total_tokens (96) expire_time(32)
+        uint256 packed2;            // 0 (64) token_addr (160) claimed_numbers(15) total_numbers(15) token_type(1) ifrandom(1)
+    }
+
+    //记录创建成功
+    event CreationSuccess(
+        uint total,
+        bytes32 id,
+        string name,
+        string message,
+        address creator,
+        uint creation_time,
+        address token_address,
+        uint number,
+        bool ifrandom,
+        uint duration
+    );
+    
+    //领取成功
+    event ClaimSuccess(
+        bytes32 id,
+        address claimer,
+        uint claimed_value,
+        address token_address
+    );
+
+    //退款成功
+    event RefundSuccess(
+        bytes32 id,
+        address token_address,
+        uint remaining_balance
+    );
+
+    using SafeERC20Upgradeable for IERC20Upgradeable;
+    uint32 nonce;
+    mapping(bytes32 => RedPacket) redpacket_by_id;
+    bytes32 private seed;
+    uint256 constant MASK = 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF;
+
+    function initialize() public initializer {
+        seed = keccak256(abi.encodePacked("Former NBA Commissioner David St", block.timestamp, msg.sender));
+    }
+
+    function getTestUpgradeable() public view returns(uint) {
+        return 1;
+    }
+
+    // Inits a red packet instance
+    // _token_type: 0 - ETH  1 - ERC20
+    /*
+   _public_key 公钥
+   _number 红包个数 
+    _ifrandom 是否随机
+   _duration 红包期限 毫秒
+   _seed
+   _message 信息
+   _name 
+   _token_type 令牌类型
+   _token_addr 令牌地址
+   _total_totkens 总币
+     */
+    function create_red_packet (address _public_key, uint _number, bool _ifrandom, uint _duration, 
+                                bytes32 _seed, string memory _message, string memory _name,
+                                uint _token_type, address _token_addr, uint _total_tokens) 
+    public payable {
+        nonce ++;
+        require(_total_tokens >= _number, "#tokens > #packets");
+        //至少一个红包数量
+        require(_number > 0, "At least 1 recipient");
+        //红包数量必须小于 256
+        require(_number < 256, "At most 255 recipients");
+        //token type 不能为 0 or 1
+        require(_token_type == 0 || _token_type == 1, "Unrecognizable token type");
+        //收款金额
+        uint256 received_amount = _total_tokens;
+        console.log("create_red_packet msg.value='%d' _total_tokens='%d'", msg.value, _total_tokens);
+        //如果令牌类型为0
+        if (_token_type == 0)
+            require(msg.value >= _total_tokens, "No enough ETH");
+        else if (_token_type == 1) {   //如果令牌类型为1
+            // https://github.com/DimensionDev/Maskbook/issues/4168
+            // `received_amount` is not necessarily equal to `_total_tokens`
+            uint256 balance_before_transfer = IERC20(_token_addr).balanceOf(address(this));
+            IERC20Upgradeable(_token_addr).safeTransferFrom(msg.sender, address(this), _total_tokens);
+            uint256 balance_after_transfer = IERC20(_token_addr).balanceOf(address(this));
+            received_amount = balance_after_transfer.sub(balance_before_transfer);
+            require(received_amount >= _number, "#received > #packets");
+        }
+
+        bytes32 _id = keccak256(abi.encodePacked(msg.sender, block.timestamp, nonce, seed, _seed));
+        {
+            uint _random_type = _ifrandom ? 1 : 0;
+            RedPacket storage redp = redpacket_by_id[_id];
+            redp.packed.packed1 = wrap1(received_amount, _duration);
+            redp.packed.packed2 = wrap2(_token_addr, _number, _token_type, _random_type);
+            redp.public_key = _public_key;
+            redp.creator = msg.sender;
+        }
+        {
+            // as a workaround for "CompilerError: Stack too deep, try removing local variables"
+            uint number = _number;
+            bool ifrandom = _ifrandom;
+            uint duration = _duration;
+        
+            //创建成功
+            emit CreationSuccess(received_amount, _id, _name, _message, msg.sender, block.timestamp, _token_addr, number, ifrandom, duration);
+        }
+    }
+
+    // It takes the signed msg.sender message as verification passcode
+    //将签名的msg.sender 消息作为验证消息
+    // function claim(bytes32 id, bytes memory signedMsg, address payable recipient) 
+    function claim(bytes32 id, address payable recipient) 
+    public returns (uint claimed) {
+
+        RedPacket storage rp = redpacket_by_id[id];
+        Packed memory packed = rp.packed;
+        console.log("claim unbox(packed.packed1, 224, 32)='%d' block.timestamp='%d'", unbox(packed.packed1, 224, 32), block.timestamp);
+        // Unsuccessful
+        require (unbox(packed.packed1, 224, 32) > block.timestamp, "Expired");
+        uint total_number = unbox(packed.packed2, 239, 15);
+        uint claimed_number = unbox(packed.packed2, 224, 15);
+        require (claimed_number < total_number, "Out of stock");
+        
+        // address public_key = rp.public_key;
+        //  require(_verify(signedMsg, public_key), "Verification failed");
+
+        uint256 claimed_tokens;
+        uint256 token_type = unbox(packed.packed2, 254, 1);
+        uint256 ifrandom = unbox(packed.packed2, 255, 1);
+        uint256 remaining_tokens = unbox(packed.packed1, 128, 96);
+        if (ifrandom == 1) {//如果是随机模式，则生成随机红包
+            if (total_number - claimed_number == 1)
+                claimed_tokens = remaining_tokens;
+            else 
+                claimed_tokens = random(seed, nonce) % SafeMath.div(SafeMath.mul(remaining_tokens, 2), total_number - claimed_number);
+            if (claimed_tokens == 0) 
+                claimed_tokens = 1;
+        } else {
+            if (total_number - claimed_number == 1) 
+                claimed_tokens = remaining_tokens;
+            else
+                claimed_tokens = SafeMath.div(remaining_tokens, (total_number - claimed_number));
+        }
+        rp.packed.packed1 = rewriteBox(packed.packed1, 128, 96, remaining_tokens - claimed_tokens);
+
+        // Penalize greedy attackers by placing duplication check at the very last
+        require(rp.claimed_list[msg.sender] == 0, "Already claimed");
+
+        rp.claimed_list[msg.sender] = claimed_tokens;
+        rp.packed.packed2 = rewriteBox(packed.packed2, 224, 15, claimed_number + 1);
+
+        // Transfer the red packet after state changing
+        //状态改变就发送红包
+        if (token_type == 0)
+            recipient.transfer(claimed_tokens);
+        else if (token_type == 1)
+            transfer_token(address(uint160(unbox(packed.packed2, 64, 160))), recipient, claimed_tokens);
+        // Claim success event
+        emit ClaimSuccess(id, recipient, claimed_tokens, address(uint160(unbox(packed.packed2, 64, 160))));
+        return claimed_tokens;
+    }
+
+    // as a workaround for "CompilerError: Stack too deep, try removing local variables"
+    function _verify(bytes memory signedMsg, address public_key) private view returns (bool verified) {
+        bytes memory prefix = "\x19Ethereum Signed Message:\n20";
+        bytes32 prefixedHash = keccak256(abi.encodePacked(prefix, msg.sender));
+        address calculated_public_key = ECDSA.recover(prefixedHash, signedMsg);
+        return (calculated_public_key == public_key);
+    }
+
+    // Returns 1. remaining value 2. total number of red packets 3. claimed number of red packets
+    //返回 1. 剩余币 2. 红包总数 3. 已领取红包数
+    function check_availability(bytes32 id) external view returns ( address token_address, uint balance, uint total, 
+                                                                    uint claimed, bool expired, uint256 claimed_amount) {
+        RedPacket storage rp = redpacket_by_id[id];
+        Packed memory packed = rp.packed;
+        return (
+            address(uint160(unbox(packed.packed2, 64, 160))), 
+            unbox(packed.packed1, 128, 96), 
+            unbox(packed.packed2, 239, 15), 
+            unbox(packed.packed2, 224, 15), 
+            block.timestamp > unbox(packed.packed1, 224, 32), 
+            rp.claimed_list[msg.sender]
+        );
+    }
+
+    /**退钱 */
+    function refund(bytes32 id) public {
+        RedPacket storage rp = redpacket_by_id[id];
+        Packed memory packed = rp.packed;
+        address creator = rp.creator;
+        require(creator == msg.sender, "Creator Only");
+        require(unbox(packed.packed1, 224, 32) <= block.timestamp, "Not expired yet");
+        uint256 remaining_tokens = unbox(packed.packed1, 128, 96);
+        require(remaining_tokens != 0, "None left in the red packet");
+
+        uint256 token_type = unbox(packed.packed2, 254, 1);
+        address token_address = address(uint160(unbox(packed.packed2, 64, 160)));
+
+        rp.packed.packed1 = rewriteBox(packed.packed1, 128, 96, 0);
+
+        if (token_type == 0) {
+            payable(msg.sender).transfer(remaining_tokens);
+        }
+        else if (token_type == 1) {
+            transfer_token(token_address, msg.sender, remaining_tokens);
+        }
+        //退钱成功
+        emit RefundSuccess(id, token_address, remaining_tokens);
+    }
+
+//------------------------------------------------------------------
+    /**
+     * position      position in a memory block
+     * size          data size
+     * data          data
+     * box() inserts the data in a 256bit word with the given position and returns it
+     * data is checked by validRange() to make sure it is not over size 
+    **/
+
+    function box (uint16 position, uint16 size, uint256 data) internal pure returns (uint256 boxed) {
+        require(validRange(size, data), "Value out of range BOX");
+        assembly {
+            // data << position
+            boxed := shl(position, data)
+        }
+    }
+
+    /**
+     * position      position in a memory block
+     * size          data size
+     * base          base data
+     * unbox() extracts the data out of a 256bit word with the given position and returns it
+     * base is checked by validRange() to make sure it is not over size 
+    **/
+
+    function unbox (uint256 base, uint16 position, uint16 size) internal pure returns (uint256 unboxed) {
+        require(validRange(256, base), "Value out of range UNBOX");
+        assembly {
+            // (((1 << size) - 1) & base >> position)
+            unboxed := and(sub(shl(size, 1), 1), shr(position, base))
+
+        }
+    }
+
+    /**
+     * size          data size
+     * data          data
+     * validRange()  checks if the given data is over the specified data size
+    **/
+
+    function validRange (uint16 size, uint256 data) internal pure returns(bool ifValid) { 
+        assembly {
+            // 2^size > data or size ==256
+            ifValid := or(eq(size, 256), gt(shl(size, 1), data))
+        }
+    }
+
+    /**
+     * _box          32byte data to be modified
+     * position      position in a memory block
+     * size          data size
+     * data          data to be inserted
+     * rewriteBox() updates a 32byte word with a data at the given position with the specified size
+    **/
+
+    function rewriteBox (uint256 _box, uint16 position, uint16 size, uint256 data) 
+                        internal pure returns (uint256 boxed) {
+        assembly {
+            // mask = ~((1 << size - 1) << position)
+            // _box = (mask & _box) | ()data << position)
+            boxed := or( and(_box, not(shl(position, sub(shl(size, 1), 1)))), shl(position, data))
+        }
+    }
+
+    function transfer_token(address token_address, address recipient_address, uint amount) internal{
+        IERC20Upgradeable(token_address).safeTransfer(recipient_address, amount);
+    }
+    
+    // A boring wrapper
+    function random(bytes32 _seed, uint32 nonce_rand) internal view returns (uint rand) {
+        return uint(keccak256(abi.encodePacked(nonce_rand, msg.sender, _seed, block.timestamp))) + 1 ;
+    }
+    
+    function wrap1 (uint _total_tokens, uint _duration) internal view returns (uint256 packed1) {
+        uint256 _packed1 = 0;
+        _packed1 |= box(128, 96, _total_tokens);        // total tokens = 80 bits = ~8 * 10^10 18 decimals
+        _packed1 |= box(224, 32, (block.timestamp + _duration));    // expiration_time = 32 bits (until 2106)
+        return _packed1;
+    }
+
+    function wrap2 (address _token_addr, uint _number, uint _token_type, uint _ifrandom) internal pure returns (uint256 packed2) {
+        uint256 _packed2 = 0;
+        _packed2 |= box(64, 160, uint160(_token_addr));    // token_address = 160 bits
+        _packed2 |= box(224, 15, 0);                   // claimed_number = 14 bits 16384
+        _packed2 |= box(239, 15, _number);               // total_number = 14 bits 16384
+        _packed2 |= box(254, 1, _token_type);             // token_type = 1 bit 2
+        _packed2 |= box(255, 1, _ifrandom);                 // ifrandom = 1 bit 2
+        return _packed2;
+    }
+}

contracts/redpacket_v1.sol

@@ -0,0 +1,332 @@
+// SPDX-License-Identifier: MIT
+
+/**
+ * @author          Yisi Liu
+ * @contact         yisiliu@gmail.com
+ * @author_time     04/20/2021
+ * @maintainer      Hancheng Zhou, Yisi Liu
+ * @maintain_time   05/21/2021
+**/
+
+pragma solidity >= 0.8.0;
+import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
+import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
+import "@openzeppelin/contracts/utils/math/SafeMath.sol";
+import "@openzeppelin/contracts/utils/cryptography/ECDSA.sol";
+
+
+import "hardhat/console.sol";
+
+/**幸运红包 */
+contract HappyRedPacketV1  {
+    using SafeMath for uint256;
+    /**红包结构体对象 */
+    struct RedPacket {
+        Packed packed;
+        //红包领取清单
+        mapping(address => uint256) claimed_list;
+        //公钥
+        address public_key;
+        //创建者
+        address creator;
+    }
+
+    struct Packed {
+        uint256 packed1;            // 0 (128) total_tokens (96) expire_time(32)
+        uint256 packed2;            // 0 (64) token_addr (160) claimed_numbers(15) total_numbers(15) token_type(1) ifrandom(1)
+    }
+
+    //记录创建成功
+    event CreationSuccess(
+        uint total,
+        bytes32 id,
+        string name,
+        string message,
+        address creator,
+        uint creation_time,
+        address token_address,
+        uint number,
+        bool ifrandom,
+        uint duration
+    );
+    
+    //领取成功
+    event ClaimSuccess(
+        bytes32 id,
+        address claimer,
+        uint claimed_value,
+        address token_address
+    );
+
+    //退款成功
+    event RefundSuccess(
+        bytes32 id,
+        address token_address,
+        uint remaining_balance
+    );
+
+    using SafeERC20 for IERC20;
+    uint32 nonce;
+    mapping(bytes32 => RedPacket) redpacket_by_id;
+    bytes32 private seed;
+    uint256 constant MASK = 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF;
+
+    constructor() public {
+        seed = keccak256(abi.encodePacked("Former NBA Commissioner David St", block.timestamp, msg.sender));
+    }
+
+    // Inits a red packet instance
+    // _token_type: 0 - ETH  1 - ERC20
+    /*
+   _public_key 公钥
+   _number 红包个数 
+    _ifrandom 是否随机
+   _duration 红包期限 毫秒
+   _seed
+   _message 信息
+   _name 
+   _token_type 令牌类型
+   _token_addr 令牌地址
+   _total_totkens 总币
+     */
+    function create_red_packet (address _public_key, uint _number, bool _ifrandom, uint _duration, 
+                                bytes32 _seed, string memory _message, string memory _name,
+                                uint _token_type, address _token_addr, uint _total_tokens) 
+    public payable {
+        nonce ++;
+        require(_total_tokens >= _number, "#tokens > #packets");
+        //至少一个红包数量
+        require(_number > 0, "At least 1 recipient");
+        //红包数量必须小于 256
+        require(_number < 256, "At most 255 recipients");
+        //token type 不能为 0 or 1
+        require(_token_type == 0 || _token_type == 1, "Unrecognizable token type");
+        //收款金额
+        uint256 received_amount = _total_tokens;
+        console.log("create_red_packet msg.value='%d' _total_tokens='%d'", msg.value, _total_tokens);
+        //如果令牌类型为0
+        if (_token_type == 0)
+            require(msg.value >= _total_tokens, "No enough ETH");
+        else if (_token_type == 1) {   //如果令牌类型为1
+            // https://github.com/DimensionDev/Maskbook/issues/4168
+            // `received_amount` is not necessarily equal to `_total_tokens`
+            uint256 balance_before_transfer = IERC20(_token_addr).balanceOf(address(this));
+            IERC20(_token_addr).safeTransferFrom(msg.sender, address(this), _total_tokens);
+            uint256 balance_after_transfer = IERC20(_token_addr).balanceOf(address(this));
+            received_amount = balance_after_transfer.sub(balance_before_transfer);
+            require(received_amount >= _number, "#received > #packets");
+        }
+
+        bytes32 _id = keccak256(abi.encodePacked(msg.sender, block.timestamp, nonce, seed, _seed));
+        {
+            uint _random_type = _ifrandom ? 1 : 0;
+            RedPacket storage redp = redpacket_by_id[_id];
+            redp.packed.packed1 = wrap1(received_amount, _duration);
+            redp.packed.packed2 = wrap2(_token_addr, _number, _token_type, _random_type);
+            redp.public_key = _public_key;
+            redp.creator = msg.sender;
+        }
+        {
+            // as a workaround for "CompilerError: Stack too deep, try removing local variables"
+            uint number = _number;
+            bool ifrandom = _ifrandom;
+            uint duration = _duration;
+        
+            //创建成功
+            emit CreationSuccess(received_amount, _id, _name, _message, msg.sender, block.timestamp, _token_addr, number, ifrandom, duration);
+        }
+    }
+
+    // It takes the signed msg.sender message as verification passcode
+    //将签名的msg.sender 消息作为验证消息
+    // function claim(bytes32 id, bytes memory signedMsg, address payable recipient) 
+    function claim(bytes32 id, address payable recipient) 
+    public returns (uint claimed) {
+
+        RedPacket storage rp = redpacket_by_id[id];
+        Packed memory packed = rp.packed;
+        console.log("claim unbox(packed.packed1, 224, 32)='%d' block.timestamp='%d'", unbox(packed.packed1, 224, 32), block.timestamp);
+        // Unsuccessful
+        require (unbox(packed.packed1, 224, 32) > block.timestamp, "Expired");
+        uint total_number = unbox(packed.packed2, 239, 15);
+        uint claimed_number = unbox(packed.packed2, 224, 15);
+        require (claimed_number < total_number, "Out of stock");
+        
+        // address public_key = rp.public_key;
+        //  require(_verify(signedMsg, public_key), "Verification failed");
+
+        uint256 claimed_tokens;
+        uint256 token_type = unbox(packed.packed2, 254, 1);
+        uint256 ifrandom = unbox(packed.packed2, 255, 1);
+        uint256 remaining_tokens = unbox(packed.packed1, 128, 96);
+        if (ifrandom == 1) {//如果是随机模式，则生成随机红包
+            if (total_number - claimed_number == 1)
+                claimed_tokens = remaining_tokens;
+            else 
+                claimed_tokens = random(seed, nonce) % SafeMath.div(SafeMath.mul(remaining_tokens, 2), total_number - claimed_number);
+            if (claimed_tokens == 0) 
+                claimed_tokens = 1;
+        } else {
+            if (total_number - claimed_number == 1) 
+                claimed_tokens = remaining_tokens;
+            else
+                claimed_tokens = SafeMath.div(remaining_tokens, (total_number - claimed_number));
+        }
+        rp.packed.packed1 = rewriteBox(packed.packed1, 128, 96, remaining_tokens - claimed_tokens);
+
+        // Penalize greedy attackers by placing duplication check at the very last
+        require(rp.claimed_list[msg.sender] == 0, "Already claimed");
+
+        rp.claimed_list[msg.sender] = claimed_tokens;
+        rp.packed.packed2 = rewriteBox(packed.packed2, 224, 15, claimed_number + 1);
+
+        // Transfer the red packet after state changing
+        //状态改变就发送红包
+        if (token_type == 0)
+            recipient.transfer(claimed_tokens);
+        else if (token_type == 1)
+            transfer_token(address(uint160(unbox(packed.packed2, 64, 160))), recipient, claimed_tokens);
+        // Claim success event
+        emit ClaimSuccess(id, recipient, claimed_tokens, address(uint160(unbox(packed.packed2, 64, 160))));
+        return claimed_tokens;
+    }
+
+    // as a workaround for "CompilerError: Stack too deep, try removing local variables"
+    function _verify(bytes memory signedMsg, address public_key) private view returns (bool verified) {
+        bytes memory prefix = "\x19Ethereum Signed Message:\n20";
+        bytes32 prefixedHash = keccak256(abi.encodePacked(prefix, msg.sender));
+        address calculated_public_key = ECDSA.recover(prefixedHash, signedMsg);
+        return (calculated_public_key == public_key);
+    }
+
+    // Returns 1. remaining value 2. total number of red packets 3. claimed number of red packets
+    //返回 1. 剩余币 2. 红包总数 3. 已领取红包数
+    function check_availability(bytes32 id) external view returns ( address token_address, uint balance, uint total, 
+                                                                    uint claimed, bool expired, uint256 claimed_amount) {
+        RedPacket storage rp = redpacket_by_id[id];
+        Packed memory packed = rp.packed;
+        return (
+            address(uint160(unbox(packed.packed2, 64, 160))), 
+            unbox(packed.packed1, 128, 96), 
+            unbox(packed.packed2, 239, 15), 
+            unbox(packed.packed2, 224, 15), 
+            block.timestamp > unbox(packed.packed1, 224, 32), 
+            rp.claimed_list[msg.sender]
+        );
+    }
+
+    /**退钱 */
+    function refund(bytes32 id) public {
+        RedPacket storage rp = redpacket_by_id[id];
+        Packed memory packed = rp.packed;
+        address creator = rp.creator;
+        require(creator == msg.sender, "Creator Only");
+        require(unbox(packed.packed1, 224, 32) <= block.timestamp, "Not expired yet");
+        uint256 remaining_tokens = unbox(packed.packed1, 128, 96);
+        require(remaining_tokens != 0, "None left in the red packet");
+
+        uint256 token_type = unbox(packed.packed2, 254, 1);
+        address token_address = address(uint160(unbox(packed.packed2, 64, 160)));
+
+        rp.packed.packed1 = rewriteBox(packed.packed1, 128, 96, 0);
+
+        if (token_type == 0) {
+            payable(msg.sender).transfer(remaining_tokens);
+        }
+        else if (token_type == 1) {
+            transfer_token(token_address, msg.sender, remaining_tokens);
+        }
+        //退钱成功
+        emit RefundSuccess(id, token_address, remaining_tokens);
+    }
+
+//------------------------------------------------------------------
+    /**
+     * position      position in a memory block
+     * size          data size
+     * data          data
+     * box() inserts the data in a 256bit word with the given position and returns it
+     * data is checked by validRange() to make sure it is not over size 
+    **/
+
+    function box (uint16 position, uint16 size, uint256 data) internal pure returns (uint256 boxed) {
+        require(validRange(size, data), "Value out of range BOX");
+        assembly {
+            // data << position
+            boxed := shl(position, data)
+        }
+    }
+
+    /**
+     * position      position in a memory block
+     * size          data size
+     * base          base data
+     * unbox() extracts the data out of a 256bit word with the given position and returns it
+     * base is checked by validRange() to make sure it is not over size 
+    **/
+
+    function unbox (uint256 base, uint16 position, uint16 size) internal pure returns (uint256 unboxed) {
+        require(validRange(256, base), "Value out of range UNBOX");
+        assembly {
+            // (((1 << size) - 1) & base >> position)
+            unboxed := and(sub(shl(size, 1), 1), shr(position, base))
+
+        }
+    }
+
+    /**
+     * size          data size
+     * data          data
+     * validRange()  checks if the given data is over the specified data size
+    **/
+
+    function validRange (uint16 size, uint256 data) internal pure returns(bool ifValid) { 
+        assembly {
+            // 2^size > data or size ==256
+            ifValid := or(eq(size, 256), gt(shl(size, 1), data))
+        }
+    }
+
+    /**
+     * _box          32byte data to be modified
+     * position      position in a memory block
+     * size          data size
+     * data          data to be inserted
+     * rewriteBox() updates a 32byte word with a data at the given position with the specified size
+    **/
+
+    function rewriteBox (uint256 _box, uint16 position, uint16 size, uint256 data) 
+                        internal pure returns (uint256 boxed) {
+        assembly {
+            // mask = ~((1 << size - 1) << position)
+            // _box = (mask & _box) | ()data << position)
+            boxed := or( and(_box, not(shl(position, sub(shl(size, 1), 1)))), shl(position, data))
+        }
+    }
+
+    function transfer_token(address token_address, address recipient_address, uint amount) internal{
+        IERC20(token_address).safeTransfer(recipient_address, amount);
+    }
+    
+    // A boring wrapper
+    function random(bytes32 _seed, uint32 nonce_rand) internal view returns (uint rand) {
+        return uint(keccak256(abi.encodePacked(nonce_rand, msg.sender, _seed, block.timestamp))) + 1 ;
+    }
+    
+    function wrap1 (uint _total_tokens, uint _duration) internal view returns (uint256 packed1) {
+        uint256 _packed1 = 0;
+        _packed1 |= box(128, 96, _total_tokens);        // total tokens = 80 bits = ~8 * 10^10 18 decimals
+        _packed1 |= box(224, 32, (block.timestamp + _duration));    // expiration_time = 32 bits (until 2106)
+        return _packed1;
+    }
+
+    function wrap2 (address _token_addr, uint _number, uint _token_type, uint _ifrandom) internal pure returns (uint256 packed2) {
+        uint256 _packed2 = 0;
+        _packed2 |= box(64, 160, uint160(_token_addr));    // token_address = 160 bits
+        _packed2 |= box(224, 15, 0);                   // claimed_number = 14 bits 16384
+        _packed2 |= box(239, 15, _number);               // total_number = 14 bits 16384
+        _packed2 |= box(254, 1, _token_type);             // token_type = 1 bit 2
+        _packed2 |= box(255, 1, _ifrandom);                 // ifrandom = 1 bit 2
+        return _packed2;
+    }
+}

hardhat.config.js

@@ -0,0 +1,28 @@
+require("@nomiclabs/hardhat-waffle");
+require('@openzeppelin/hardhat-upgrades');
+// This is a sample Hardhat task. To learn how to create your own go to
+// https://hardhat.org/guides/create-task.html
+task("accounts", "Prints the list of accounts", async (taskArgs, hre) => {
+  const accounts = await hre.ethers.getSigners();
+
+  for (const account of accounts) {
+    console.log(account.address);
+  }
+});
+
+// You need to export an object to set up your config
+// Go to https://hardhat.org/config/ to learn more
+
+/**
+ * @type import('hardhat/config').HardhatUserConfig
+ * 0x221bd86B1198a32548Cd201D775a1E245C3DadF7
+ */
+module.exports = {
+  solidity: "0.8.0",
+  networks: {
+    rinkeby: {
+      url: "https://eth-rinkeby.alchemyapi.io/v2/vfdcLFOQwECexXNSekfxb0ImvAH19PbQ",
+      accounts: ["6084c2a5e39fa83d5a119c3a864a442e77287f4b03bad93cef38ec5f44bca630"]
+    },
+  },
+};

package-lock.json

@@ -0,0 +1,27203 @@
+{
+  "name": "redpacket-hardhad-rinkeby",
+  "version": "1.0.0",
+  "lockfileVersion": 2,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "redpacket-hardhad-rinkeby",
+      "version": "1.0.0",
+      "license": "MIT",
+      "dependencies": {
+        "@openzeppelin/contracts-upgradeable": "^4.0.0"
+      },
+      "devDependencies": {
+        "@nomiclabs/hardhat-ethers": "^2.0.5",
+        "@nomiclabs/hardhat-waffle": "^2.0.3",
+        "@openzeppelin/contracts": "^4.0.0",
+        "@openzeppelin/hardhat-upgrades": "^1.9.0",
+        "chai": "^4.3.6",
+        "ethereum-waffle": "^3.4.0",
+        "ethers": "^5.6.1",
+        "hardhat": "^2.9.1"
+      }
+    },
+    "node_modules/@ensdomains/ens": {
+      "version": "0.4.5",
+      "resolved": "https://registry.npmjs.org/@ensdomains/ens/-/ens-0.4.5.tgz",
+      "integrity": "sha512-JSvpj1iNMFjK6K+uVl4unqMoa9rf5jopb8cya5UGBWz23Nw8hSNT7efgUx4BTlAPAgpNlEioUfeTyQ6J9ZvTVw==",
+      "deprecated": "Please use @ensdomains/ens-contracts",
+      "dev": true,
+      "dependencies": {
+        "bluebird": "^3.5.2",
+        "eth-ens-namehash": "^2.0.8",
+        "solc": "^0.4.20",
+        "testrpc": "0.0.1",
+        "web3-utils": "^1.0.0-beta.31"
+      }
+    },
+    "node_modules/@ensdomains/ens/node_modules/ansi-regex": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
+      "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
+      "dev": true,
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
+    "node_modules/@ensdomains/ens/node_modules/camelcase": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-3.0.0.tgz",
+      "integrity": "sha1-MvxLn82vhF/N9+c7uXysImHwqwo=",
+      "dev": true,
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
+    "node_modules/@ensdomains/ens/node_modules/cliui": {
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/cliui/-/cliui-3.2.0.tgz",
+      "integrity": "sha1-EgYBU3qRbSmUD5NNo7SNWFo5IT0=",
+      "dev": true,
+      "dependencies": {
+        "string-width": "^1.0.1",
+        "strip-ansi": "^3.0.1",
+        "wrap-ansi": "^2.0.0"
+      }
+    },
+    "node_modules/@ensdomains/ens/node_modules/decamelize": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/decamelize/-/decamelize-1.2.0.tgz",
+      "integrity": "sha1-9lNNFRSCabIDUue+4m9QH5oZEpA=",
+      "dev": true,
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
+    "node_modules/@ensdomains/ens/node_modules/fs-extra": {
+      "version": "0.30.0",
+      "resolved": "https://registry.npmjs.org/fs-extra/-/fs-extra-0.30.0.tgz",
+      "integrity": "sha1-8jP/zAjU2n1DLapEl3aYnbHfk/A=",
+      "dev": true,
+      "dependencies": {
+        "graceful-fs": "^4.1.2",
+        "jsonfile": "^2.1.0",
+        "klaw": "^1.0.0",
+        "path-is-absolute": "^1.0.0",
+        "rimraf": "^2.2.8"
+      }
+    },
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+}

package.json

@@ -0,0 +1,24 @@
+{
+  "name": "redpacket-hardhad-rinkeby",
+  "version": "1.0.0",
+  "description": "redpacket-hardhad-rinkeby test",
+  "main": "hardhat.config.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "devyk",
+  "license": "MIT",
+  "devDependencies": {
+    "@nomiclabs/hardhat-ethers": "^2.0.5",
+    "@nomiclabs/hardhat-waffle": "^2.0.3",
+    "@openzeppelin/contracts": "^4.0.0",
+    "@openzeppelin/hardhat-upgrades": "^1.9.0",
+    "chai": "^4.3.6",
+    "ethereum-waffle": "^3.4.0",
+    "ethers": "^5.6.1",
+    "hardhat": "^2.9.1"
+  },
+  "dependencies": {
+    "@openzeppelin/contracts-upgradeable": "^4.0.0"
+  }
+}

scripts/redpacket_v1_deploy.js

@@ -0,0 +1,32 @@
+// We require the Hardhat Runtime Environment explicitly here. This is optional
+// but useful for running the script in a standalone fashion through `node <script>`.
+//
+// When running the script with `npx hardhat run <script>` you'll find the Hardhat
+// Runtime Environment's members available in the global scope.
+const hre = require("hardhat");
+
+async function main() {
+  // Hardhat always runs the compile task when running scripts with its command
+  // line interface.
+  //
+  // If this script is run directly using `node` you may want to call compile
+  // manually to make sure everything is compiled
+  // await hre.run('compile');
+
+  // We get the contract to deployi
+  const RedPacket = await hre.ethers.getContractFactory("HappyRedPacketV1");
+  const redPacket = await RedPacket.deploy();
+
+  await redPacket.deployed();
+
+  console.log("RedPacketV1 deployed to:", redPacket.address);
+}
+
+// We recommend this pattern to be able to use async/await everywhere
+// and properly handle errors.
+main()
+  .then(() => process.exit(0))
+  .catch((error) => {
+    console.error(error);
+    process.exit(1);
+  });

scripts/redpacket_v1_local_deploy.js

@@ -0,0 +1,47 @@
+// We require the Hardhat Runtime Environment explicitly here. This is optional
+// but useful for running the script in a standalone fashion through `node <script>`.
+//
+// When running the script with `npx hardhat run <script>` you'll find the Hardhat
+// Runtime Environment's members available in the global scope.
+const hre = require("hardhat");
+
+async function main() {
+  // Hardhat always runs the compile task when running scripts with its command
+  // line interface.
+  //
+  // If this script is run directly using `node` you may want to call compile
+  // manually to make sure everything is compiled
+  // await hre.run('compile');
+
+  // We get the contract to deployi
+  const RedPacket = await hre.ethers.getContractFactory("HappyRedPacket");
+  const redPacket = await RedPacket.deploy();
+  await redPacket.deployed();
+
+  redPacket.on("CreationSuccess", (received_amount, _id, _name, _message, msg_sender, block_timestamp, _token_addr, number, ifrandom, duration) => {
+    console.log("CreationSuccess ->", received_amount, _id, _name, _message, msg_sender, block_timestamp, _token_addr, number, ifrandom, duration);
+    console.log("CreationSuccess id ->", _id);
+  });
+  const ret = await redPacket.create_red_packet
+    ("0x5FbDB2315678afecb367f032d93F642f64180aa3"
+      , 1
+      , false
+      , 10000
+      ,"0x36549bd2558d9f37204f55be93cc38db93f377217b306febb9899c0013735755"
+      , "good luck"
+      , "good luck"
+      , 0
+      , "0x0000000000000000000000000000000000000000"
+      , 1
+      , { gasLimit: 310000, value: 1 })
+  console.log("RedPacket deployed to:", redPacket.address);
+}
+
+// We recommend this pattern to be able to use async/await everywhere
+// and properly handle errors.
+main()
+  .then(() => process.exit(0))
+  .catch((error) => {
+    console.error(error);
+    process.exit(1);
+  });

scripts/redpacket_v1_proxy_deploy.js

@@ -0,0 +1,52 @@
+// We require the Hardhat Runtime Environment explicitly here. This is optional
+// but useful for running the script in a standalone fashion through `node <script>`.
+//
+// When running the script with `npx hardhat run <script>` you'll find the Hardhat
+// Runtime Environment's members available in the global scope.
+const { ethers, upgrades } = require("hardhat");
+
+const deployedContracts = {
+  mainnet: '',
+  ropsten: '',
+  bsc_mainnet: '',
+  matic_mainnet: '',
+  arbitrum: '',
+  arbitrum_rinkeby: '0x4B20EbcFD9a74f969a77B9233a881FC5266930E1',
+  xdai: '',
+  goerli: '',
+  fantom: '',
+  avalanche: '',
+  celo: '',
+  optimism: '',
+  optimism_kovan: '',
+  aurora: '',
+  fuse: '',
+  boba: '',
+  moonriver: '',
+}
+// deploy, we normally do this only once
+const firstDeployed = false;
+async function main() {
+  let proxyAddress = deployedContracts['arbitrum_rinkeby']
+  console.log("proxyAddress", proxyAddress)
+  if (firstDeployed) {
+    const HappyRedPacketImpl = await ethers.getContractFactory("HappyRedPacket");
+    const HappyRedPacketProxy = await upgrades.deployProxy(HappyRedPacketImpl, []);
+    await HappyRedPacketProxy.deployed()
+    console.log("HappyRedPacketProxy deployed to:", HappyRedPacketProxy.address);
+  } else {
+    // upgrade contract
+    const HappyRedPacketImpl = await ethers.getContractFactory('HappyRedPacket')
+    const instance = await upgrades.upgradeProxy(proxyAddress, HappyRedPacketImpl)
+    console.log("HappyRedPacketProxy upgradeProxy deployed to:", proxyAddress);
+  }
+}
+
+// We recommend this pattern to be able to use async/await everywhere
+// and properly handle errors.
+main()
+  .then(() => process.exit(0))
+  .catch((error) => {
+    console.error(error);
+    process.exit(1);
+  });

scripts/sample-script.js

@@ -0,0 +1,32 @@
+// We require the Hardhat Runtime Environment explicitly here. This is optional
+// but useful for running the script in a standalone fashion through `node <script>`.
+//
+// When running the script with `npx hardhat run <script>` you'll find the Hardhat
+// Runtime Environment's members available in the global scope.
+const hre = require("hardhat");
+
+async function main() {
+  // Hardhat always runs the compile task when running scripts with its command
+  // line interface.
+  //
+  // If this script is run directly using `node` you may want to call compile
+  // manually to make sure everything is compiled
+  // await hre.run('compile');
+
+  // We get the contract to deploy
+  const Greeter = await hre.ethers.getContractFactory("Greeter");
+  const greeter = await Greeter.deploy("Hello, Hardhat!");
+
+  await greeter.deployed();
+
+  console.log("Greeter deployed to:", greeter.address);
+}
+
+// We recommend this pattern to be able to use async/await everywhere
+// and properly handle errors.
+main()
+  .then(() => process.exit(0))
+  .catch((error) => {
+    console.error(error);
+    process.exit(1);
+  });

test/sample-test.js

@@ -0,0 +1,19 @@
+const { expect } = require("chai");
+const { ethers } = require("hardhat");
+
+describe("Greeter", function () {
+  it("Should return the new greeting once it's changed", async function () {
+    const Greeter = await ethers.getContractFactory("Greeter");
+    const greeter = await Greeter.deploy("Hello, world!");
+    await greeter.deployed();
+
+    expect(await greeter.greet()).to.equal("Hello, world!");
+
+    const setGreetingTx = await greeter.setGreeting("Hola, mundo!");
+
+    // wait until the transaction is mined
+    await setGreetingTx.wait();
+
+    expect(await greeter.greet()).to.equal("Hola, mundo!");
+  });
+});